Definition: Nickel, Ferronickel, Nickel Pig Iron, Nickel-based Alloys

What are Nickel? Ferronickel? Nickel Pig Iron? Nickel-based Alloys?

Through this article,, the sanitary pipe fittings supplier will introduce to you what nickel, nickel iron, nickel pig iron and nickel-based alloys are, their characteristics, uses, etc.




Nickel is a transition metal element, element symbol Ni, located in group VIII of the fourth period, atomic number 28. Nickel is mainly used in the fields of steel, nickel based alloys, electroplating and batteries, and is widely used in various military manufacturing industries such as aircraft and radar, civil machinery manufacturing and electroplating industries. Nickel is one of the important raw materials for stainless steel. Nickel consumption in China’s stainless steel industry accounts for more than 80% of primary nickel consumption and more than 2/3 globally.


An alloy of iron and nickel with a nickel content of 15% or more (mass fraction) and less than 80% (mass fraction) obtained from oxide ores or other nickel-containing materials. According to the national standard GB/T25049-2010, ferronickel can be divided into five categories: low-carbon ferronickel, low-carbon low-phosphorus ferronickel, medium-carbon ferronickel, medium-carbon low-phosphorus ferronickel, and high-carbon ferronickel.

Nickel pig iron

Nickel pig iron

Nickel Pig Iron

The nickel content of nickel pig iron is less than 15%. Generally, according to the nickel content of nickel pig iron, it can be divided into high-grade nickel pig iron (10% and above), medium-grade nickel pig iron (4–9%), and low-grade nickel pig iron. Nickel pig iron is smelted mainly in submerged arc furnaces and blast furnaces. Generally, submerged arc furnaces produce high-grade nickel pig iron, and blast furnaces produce low-grade nickel pig iron. Nickel pig iron is an important source of nickel raw material for stainless steel.

Nickel-based Alloy

Nickel-based alloy refers to an alloy based on nickel (with nickel content ?50%) and containing elements such as Cr, Mo, Cu, Al, Ti, and Nb. According to the main performance, it is further divided into nickel-based heat-resistant alloys, nickel-based corrosion resistant alloys, nickel-based wear-resistant alloys, nickel-based precision alloys and nickel-based shape memory alloys. For example, Inconel 690, Hatselloy C-276, Haynes 242, Monel 400, Incoloy800 and other nickel-based alloy brands.

food safety

Stainless Steel Is An Important Guarantee For Food Safety?

Food safety begins with strict sanitary conditions, and nickel-containing stainless steel is a high-quality and reliable guarantee for all links in the food chain.

At present, the issue of food supply and food safety is highly valued globally. According to data from the World Health Organization, every year 10% of people get sick from eating contaminated food, and 420,000 people die as a result. Among them, young children are at a particularly high risk.

food safety

Regulatory agencies in various countries attach great importance to food safety, and have introduced relevant laws and regulations to strengthen the supervision of food. For example, the Food Safety Modernization Act in the United States; China amended the Food Safety Act in June 2015, India has strengthened regulations on food contact materials, and Europe has also strengthened the 鈥淢etals and Metals Used in Food Contact Materials and Articles鈥. Alloy Technology Guide.

In the EU, three regulations constitute the food safety regulatory environment:

? “Framework Regulation EC 1935/2004”

The decree stipulates that the materials used in food equipment should not change the taste, quality or color of the food;

These materials should not cause diseases or adversely affect human health;

The decree mainly targets material manufacturers.

? “Machinery Directive EC 2006/42”

  • The regulations stipulate the design and manufacturing methods of food equipment to ensure food safety during processing;
  • This regulation is mainly aimed at equipment manufacturers.

? “Food Hygiene Regulation EC 852/2004”

  • In the preparation process from farm to table, focus on maintaining food safety and maintaining hygienic conditions;
  • It is aimed at food operators, but it also aims to make material and equipment manufacturers accountable.

In short, the purpose of these regulations is to make material manufacturers, equipment manufacturers and food operators share the responsibility of ensuring that food is safe to eat from farm to table.

Food safety investments based on sound science and regulations can help achieve sustainable development goals.

Food safety investments based on sound science and regulations can help achieve sustainable development goals and help solve food pollution problems while ensuring that the food industry receives sufficient returns. One of the investments is the use of nickel-containing stainless steel equipment. Many food-related industries (regardless of their commercial scale, involving food processing, catering, or home cooking) benefit from the hygienic properties of stainless steel while maintaining food safety for consumers throughout the value chain.

Nickel-containing stainless steel does not change the taste or color of food, does not contaminate food, and can provide excellent performance for maintaining food safety through easy and effective cleaning and disinfection.

Stainless steel is designed for hygiene

Cleanliness is the key to hygiene. The smooth, shiny stainless steel surface is very easy to clean and can be maintained for a long time. It can withstand wear, shock and temperature fluctuations, while inhibiting the accumulation of dirt and scale.

The self-healing passivation layer naturally formed in stainless steel provides corrosion protection instead of applying a coating, which may be damaged and degraded. The ability of stainless steel to be easily cleaned and disinfected can effectively and simply remove bacteria. Tests have shown that stainless steel has a low bacterial retention capacity, making it a very attractive material in the food industry. Even if it is reused, stainless steel has impeccable cleanliness. Therefore, stainless steel can meet strict hygiene standards at every stage. The corrosion resistance of stainless steel means that it is inert, does not change the taste or smell of food or beverage products, and can resist the lactic acid formed by the fermentation of acidic foods such as milk or tomatoes.

When designing or selecting food industry equipment, “hygiene” covers many aspects. The manufacturing materials must be able to resist the accumulation of process dirt and must be easy to disinfect and clean between production runs. They must not corrode or give food ingredients harmful to human health. Nickel-containing stainless steel provides all these and more. Their formability, machinability, and weldability enable stainless steel to be processed into complex shapes and components, so that it has good tolerances, which is both practical and economically feasible.

Stainless steel is suitable for all kinds of food

Nickel-containing stainless steel can be widely used in the food industry. Almost all food applications use austenitic stainless steel, including milk and beer. Type 304 is a standard material; fish and meat products may require higher grades, such as type 316L (S31603); super austenitic steel can cope with extreme harshness Conditions such as soy sauce production. Its strong corrosion resistance and easy-to-clean characteristics make stainless steel durable and hygienic. These are two very valuable characteristics in food processing.

1) Stainless steel is widely used in the Italian food industry

Stainless steel meets the specifications of the Italian Ministerial Decree of 1973, the Sanitation Regulations concerning packaging, containers, tools and equipment that come into contact with food or substances for personal use. This specification provides a list of stainless steel grades that can be used in the food industry.

Italian cooking is a perfect example of the functionality of stainless steel. With its hygienic properties, corrosion resistance and beautiful surface treatment, nickel-containing stainless steel has played an important role in the Italian food industry that relies on this effective material. For example, stainless steel is widely used for storage of cocoa butter, cocoa butter and chocolate. The manufacturing facility is equipped with stainless steel storage tanks of various volumes and weights. All storage tanks use Type 304 (UNS S30400) stainless steel specially designed for food industry standards.

Italy’s reputation for gastronomy and its world-renowned design advantages extend to its cooking utensils. Stainless steel has a rustic surface treatment, durability and resistance to dents and scratches, making it an attractive choice. By combining functionality, hygiene, design, and flavor retention (an important part of cookware), stainless steel meets strict specifications. The combination of the expertise, know-how and creativity of Italian designers with the beauty of nickel-containing stainless steel enables them to produce high-quality and exquisite cookware.

2) Application of stainless steel in milking industry

In the milking parlor, nickel-containing stainless steel is everywhere. Here, stainless steel serves the marginal market. For dairy farmers, problems such as cow mastitis and milk contamination can be catastrophic. Hygiene is the most important, and pipes, milking equipment and water tanks need to be carefully flushed and disinfected every day. Stainless steel has the properties of anti-corrosion and cleanliness of excrement. It performs well in this harsh environment and helps achieve the purpose of sanitation and disinfection.

Stainless steel is also essential for keeping milk fresh. Monitor the bacterial count in milk. If there is no very strict control of the bacterial count, it may be rejected. When the milk is squeezed out of the cow’s udder at a temperature of 35掳C, it is quickly cooled to 4-6掳C to prevent the growth of bacteria, and is stored in a stainless steel storage tank usually equipped with a stirring rod or agitator for collection. The heat exchanger is an important part of the dairy industry for cooling and heating, and is used to extract heat from raw milk. In some cases, for example, heat is further used in preheating washing water or space heating. The milk tanker on the truck also uses stainless steel to transport the milk from the milking parlor to the factory for further processing.

Whether the milk is pasteurized for drinking, dried as milk powder, or used to make cheese, yogurt, butter or ice cream, stainless steel equipment must be used to meet very strict hygiene standards.

Although duplex alloys are currently used under more stringent conditions, the main grades used are 304L (UNS S30403) and 316L (S31603) stainless steel.

Food safety has very strict requirements for sanitary conditions, and nickel-containing stainless steel is a high-quality and reliable guarantee for all links in the food chain. Today, more than 25% of total nickel production is used in stainless steel products related to the food and beverage industry. In the food and beverage industry, it is an important guarantee in the food supply chain from farm to table.

Posted by WELLGREEN, the sanitary pipe fittings supplier.

Formtracer Avant series

What Is Surface Roughness?

Definition of Surface Roughness

Surface roughness is very important for most surfaces involved in sliding contact. This is because factors such as the original rate of wear and sustained nature are highly dependent on this characteristic. These surfaces are generally load-bearing surfaces, and the roughness needs to be marked to ensure the suitability of the intended use.


Surface Roughness (SR) is the roughness of surface in our daily measurement, which can be understood as the unevenness of fine pitch and tiny peaks and valleys in the process of processing products, and also important in sanitary pipe fittings

It is usually defined as the tiny distance (wave distance) between two peaks or two trough fingers. In general, the wave distance is within 1mm or less, and it can also be defined as the measurement of micro-profiles, commonly known as micro-error value .

We generally evaluate that there will be a baseline for roughness. The highest point above the baseline is called the peak point, and the lowest point below the baseline is called the valley point.

Then the height between the peak and the valley is expressed by Z; The distance between the microtextures of the processed product We use S to express.

baseline for roughness

Under normal circumstances, the size of the S value is defined in the national verification standard:


Evaluation Parameter Relationship

Ra is defined as the average arithmetic deviation (average roughness) of the curve, Rz is defined as the average height of the unevenness, and Ry is defined as the maximum height.

The maximum height difference Ry of the micro-profile is also expressed by Rmax in other standards.

Please refer to the following table for the specific relationship between Ra and Rmax:

Comparison of Ra and Rmax parameters (um)

Table: Comparison of Ra and Rmax parameters (um)

How Is It Formed?

The formation of surface roughness is caused by the machining process of the workpiece. The processing method, the material of the workpiece, and the process are all factors of the surface roughness of the image.

For example: During the electric discharge machining, the surface of the machined part has discharge irregularities.

The processing technology and the material of the parts are different, and there are various differences in the micro marks left on the surface of the processed parts, such as (density, depth, shape change, etc.).

Effect Of Surface Roughness On Workpiece

Workpiece wear resistance Fit stability Fatigue strength Corrosion resistance Tightness Contact stiffness measurement accuracy 鈥 The coating, thermal conductivity and contact resistance, reflection ability and radiation performance, resistance to the flow of liquids and gases, and the circulation of current on the surface of the conductor will all have varying degrees of influence.

Evaluation Basis

Sampling length

The unit length of each parameter, the sampling length is the length of a reference line for evaluating the surface roughness. Under the ISO1997 standard, 0.08mm, 0.25mm, 0.8mm, 2.5mm, and 8mm are generally used as the reference length.

Evaluation length

Consists of N reference lengths. The surface roughness of each part of the surface of the component can not truly reflect the real parameter of roughness on a reference length, but it needs to take N sampling lengths to evaluate the surface roughness. The assessment length under the ISO1997 standard is generally N = 5.


The reference line is the contour center line for evaluating the roughness parameter. Generally, there is a least squares midline and a contour arithmetic mean midline.

[Least Squares Midline] is the least squares calculation of the points collected during the measurement process.

[Arithmetic mean centerline of contour] Within the sampling length, make the area of ??the two parts of the contour on the midline equal

In theory, the least square midline is an ideal baseline, but it is difficult to obtain in practical applications, so it is generally replaced by the arithmetic mean midline of the contour, and a straight line with an approximate position can be used instead.

How To Obtain The Surface Roughness Value?

Formtracer Avant series

Formtracer Avant series

The evaluation of surface roughness is increasingly valued in the manufacturing industry. To study the surface roughness, you need to use a special machine, named: surface roughness measuring instrument.

Most of the correct and complete surface roughness measurement methods, although they use a dedicated measuring machine, but in some cases, for quick and low-cost operation, you can also use hand-held kit tools to measure, as shown below:


The roughness comparison sheet is a nickel-based sample made by electroforming. It is ideal for metal processing and is a very effective auxiliary tool.

The functions that can be achieved by the roughness measuring machine are different, the evaluation method is different, and the cost is also different. Choose the most suitable model according to needs of stainless steel sanitary pipe fittings supplier.

J430 stainless steel tubings

JISCO Successfully Developed J430 Antibacterial Sanitary Tubings

JISCO Successfully Developed J430 Antibacterial Sanitary Tubings

After the occurrence of COVID-19, a stainless steel sanitary tubings R&D project with “antibacterial” as the main difficulty was included in the JISCO scientific research work schedule.

J430 stainless steel tubings

J430 stainless steel tubings

After more than three months of hard work, JISCO successfully developed J430 sanitary tubes. The first batch of products has been applied to a tableware manufacturer. The customer response was good, and then an additional 200 tons of orders were added.

The first batch of J430 antibacterial ferritic stainless steel products developed by JISCO has been tested by the Antibacterial Stainless Steel Testing Center of the Chinese Academy of Sciences and has very good antibacterial performance. The two most important indicators, E. coli and Staphylococcus aureus, have reached 99%. The above is much higher than the 95% national standard.

J430 is a kind of copper-containing antibacterial stainless steel, which is a kind of alloy antibacterial stainless steel. When the antibacterial phase is exposed on the surface of the stainless steel, it will combine with the protein of bacteria to denature the protein, thereby killing the bacteria and achieving the effect of antibacterial and bacteriostatic.

430 stainless steel is a general-purpose steel with good corrosion resistance, thermal conductivity is better than austenite, thermal expansion coefficient is smaller than austenite, heat fatigue resistance, the addition of stabilizing element titanium, good mechanical properties of the welded part.

430 stainless steel is used for building decoration, fuel burner parts, household appliances, and home appliance parts.

430F is a steel grade with easy cutting performance added to 430 steel, which is mainly used for automatic lathes, bolts and nuts.

430LX adds Ti or Nb to 430 steel, reduces C content, improves processing performance and welding performance, and is mainly used for hot water pipes, hot water supply systems, sanitary appliances, household durable appliances, etc.

Sanitary stainless steel 90 degree elbow

How Are Stainless Steel Sanitary Pipes Graded?

How Are Stainless Steel Sanitary Pipes Graded?

Stainless steel sanitary pipe and fittings are generally divided into three types according to surface treatment methods: AP grade stainless steel pipe refers to the surface of the pipe that has not been treated; BA type pipe refers to the use of bright burnt treatment; EP grade stainless steel pipe refers to the use of electrolytic polishing treatment.

Note: The factor that affects the price of stainless steel sanitary pipes is the most important determinant in the surface treatment method, and the price order is EP> BA> AP. According to the thickness: the general stainless steel thickness specifications are SCH5S, SCH10S, SCH20S, SCH40S. Stainless steel pipes can be divided according to the manufacturing process: single fusion; double fusion (the purpose is to reduce impurities in the pipeline and increase corrosion), stainless steel pipelines can be divided into seamless and seamless.

Stainless steel connection is SWG (SWAGELOK), VCR, BUTT WELDING butt welding, lock teeth (SCREWED), flange (flange), QUICK CONNECTOR (quick joint)

Notes on the selection of stainless steel pipes:

(1) Need to consider the nature of the fluid in the pipeline (flow, pressure, temperature, corrosiveness)

(2) General bulk gas (GN2, CDA, Ar, H2, O2), where GN2 and CDA use BA grade, other BULK GAS and APECIALTY GAS use EP grade pipe, the material is SUS316L, sometimes, the owner also considers GN2 With CDA as the power supply for PUMP, SUS304 will be considered.

(3) If SUS304 is used, the thickness of SCH10S or more is required for the locking teeth.

(4) VIM + VAR is usually used for highly corrosive gases, such as: BCL3, WF6, CL2, HBr, etc.

Rmax, Rz, Ra value comparison table of the same sample (unit: um)

Sample No. internal Rmax Rz Ra
1 BA 1.82 1.62 0.39
2 BA 1.92 1.72 0.16
3 BA 2.52 1.72 0.32
4 EP 0.20 0.15 0.04
5 EP 0.45 0.24 0.07
6 EP 0.89 0.73 0.07
polished stainless steel tubing

The Short-term Sanitary Stainless Steel Tubes Supply Will Gradually Pick Up And Will Become More Obvious After Mid-April

This week, the market price of sanitary stainless steel tubings continued to weaken, and the decline continued to increase. In the case of futures decline, the spot price continued to fall.

Since the start of production in more than four months, the actual demand will have a significant increase, which will have certain support for the price of sanitary stainless steel tubes.

polished stainless steel tubing

Although market fundamental pressures have eased, as the epidemic spreads, concerns about the global economic recession have increased.

In view of the current downward load on the sanitary stainless steel tube market, it is recommended that you seize the shipping opportunities brought by the peak season and the release of suppressed demand, and pay attention to preventing the risks caused by external bearishness.

This week, the prices of sanitary stainless steel tubes have dropped substantially, the market mentality is pessimistic, the overall transaction deviation, the mainstream market prices of stainless steel welded pipes and galvanized pipes have been broadly lowered, the pipe factory has weak shipments, and the inventory digestion situation is not ideal. Although the market mentality is unstable; in terms of seamless pipes, from the perspective of demand, the market situation is weakening, and the transaction is far below expectations.

On the whole, the decline in the price of raw materials has insufficient support for the market, but at present, the profit of finished products is seriously compressed, and many small pipe factories have suffered losses to varying degrees. It can be improved, and merchants are more or less resistant to price reductions, and still hold a wait-and-see attitude. Taking into account a number of factors, it is expected that the market for sanitary stainless steel tubes will narrow the decline and the shock will be weak.

From the current production situation of domestic steel mills, the production of short-flow steel mills has recovered, but the overall operating rate is still at a low level, which has little effect on the supply of sanitary stainless steel tubes.

polished stainless steel tubing

Continued Rebound In Futures Drives A Good Trend Of Stainless Steel Sanitary Pipe Spot Transactions

Continued Rebound In Futures Drives A Good Trend Of Stainless Steel Sanitary Pipe Spot Transactions

As the overseas COVID-19 epidemic shows signs of mitigation, superimposed “OPEC +” is a positive boost.

The global stock market recovered this week, and internal disk futures rebounded at a low level, which led to a narrow range of spot prices for stainless steel sanitary pipes.

Food Grade Sanitary Tube and Fittings

Food Grade Sanitary Tube and Fittings

Futures rose sharply, stainless steel sanitary pipe and fittings spot shocks were strong

Only four days of quotations were made this week. On Tuesday, the market was boosted by the reduction of the excess deposit reserve ratio. Most of the stainless steel sanitary pipe quotations were raised, which was relatively stable in the middle of the week and strengthened again on Friday. Overall, the price of stainless steel sanitary pipes has been stronger this week, market sentiment has picked up, and steel mills have a strong willingness to push prices.

In terms of futures, the rebound continued to rise, and the continued rebound in futures drove the spot transaction sentiment and speculative psychology of stainless steel sanitary tubings, forming support for market prices.

Shagang Group (the biggest private steel enterprise in China, shagang below) stabilized prices in mid-April

Shagang announced the ex-factory price of building materials in mid-April on the 11th, which was the same as that in early April. On the one hand, after the price of stainless steel sanitary pipes continued to fall in the early stage and the profits of steel mills contracted, the willingness to sell prices increased. On the other hand, by increasing the amount of the supplement to make up for the loss of traders in the process of price inversion, it also helps to push steel mills to destock. With the decline in the raw material end, steel mills will continue to increase prices willingness.

In March, steel and steel production inventories fell, and the total inventory of stainless steel sanitary pipes was still high

According to data from China Steel Association, the daily output of key steel companies in March declined month-on-month, and is in the stage of inventory reduction, and the destocking cycle is still long.


The Difference Between Sanitary Pipe Fittings And Food Grade Stainless Steel Fittings

The difference between sanitary pipe fittings and food grade stainless steel pipe fittings in the different applications.

sanitary pipes

The difference between food-grade stainless steel and sanitary stainless steel is:

Stainless steel that meets the requirements of GB / T 1220-2007 “Stainless Steel Bar” which has passed the “Certificate of Obtaining Certification” and is used for food machinery is food grade stainless steel

In the same way, stainless steel which has passed the audit of “Certificate of Obtaining Certificate”, and used for manufacturing medical devices is sanitary stainless steel.

In most cases, there is no clear difference between food grade stainless steel fittings and sanitary pipe fittings. Generally speaking, these two kinds of pipe fittings can meet one of the requirements, and most of them can also meet the other.

They are divided into food grade and sanitary grade because the certification direction is different.

Strictly speaking, there is no food grade and sanitary grade at all, this is just a customary name for people after whether materials and products meet a certain use requirement (different production standards).

In China, it refers to materials and products that meet national health standards and national food standards when used, and can be called sanitary and food grade.

For example: a certain type of plastic raw material can be used in food packaging materials after inspection and confirmation by the food supervision department, and it can be said that the type of plastic reaches food grade; similarly, this material can be used for medical instruments after being confirmed by the health supervision department, it is sanitary.

Another example: For the pipe fitting, if it meets the requirements of national standard GB 16798-1997 for food machinery: A man without special means or special trained, with only water, detergent or disinfectant, he can completed clean the valve under safety situation in a short time. It’s sanitary; At the same time, it also meets standards in terms of material composition, acid-base environment adaptation, and microorganism retention. It is a food-grade.

Of course, compared with ordinary buttweld pipe fittings, in order to meet the requirements of sanitation or food, some work must be done on material selection and structure, such as polished surface (not easy to dirty), rounded corners (easy to clean).

sanitary tubings

Surface Roughness of Stainless Steel Sanitary Tubing

Table of Sanitary Tubing Surface Roughness and Ra


Polish Grade Comparison
Buffing Type

(Emery Size or Grit Size)

Ra Rmax AARH Machining Mark
60# 3_2a 12.5s 125 **
180# 1.6a 6.3s 63 ***
220# 1.2a 4.8s 48 ***
250# 0.8a 3.2s 32 ***
300# 0.4a 1.6s 16 ***
350# 0J5a 1.0s 10 ***
400# 0.2a 0.8s 8 ****
600# 0.1a 0.4s 4 ****

The reason why sanitary tubing is used in food, gas and other fluid pipeline engineering is mainly related to the external roughness (finishness) of its surface.

sanitary tubings

The characteristics of most sanitary fittings: bright appearance, smooth inner hole, inner and outer surface roughness standard Ra 0.8 Micron.

1. Control caliber: DIN standard (DN10-DN150), 3A / IDF standard (1/2 “-12”), ISO standard (diameter from 12.7-319.3);

2. International industrial standards: DIN, ISO, SMS, 3A, IDF, etc .;

3. Product material: stainless steel 304, 304, 316, 316L;

4. Quality and use: Used for internal and external polishing equipment to achieve surface precision requirements; suitable for dairy, food, beer, beverage, pharmaceutical, cosmetics and other industrial fields;

5. Applicable medium: water, oil, gas and some corrosive liquids;

6. Product features: beautiful appearance, smooth surface, acid and alkali resistance, anti-corrosion, strong texture performance.

7. Product quality: Comply with export and nationally enforced product high-pressure pipe product standards

polished stainless steel tubing

How To Quickly Install And Effectively Maintenance of Sanitary Seamless Tubings

Installation And Effectively Maintenance of Sanitary Seamless Tubings

With the strength of the industry, the application fields of seamless stainless steel pipes are becoming more and more extensive, especially sanitary聽seamless tubings. With its exquisite appearance, high precision and high accuracy, it has a place in this industry.

polished stainless steel tubing

Although sanitary seamless tubings are widely used, during the installation process, they will also encounter problems such as: correct and fast installation, and post-installation maintenance.

First, the first thing to notice is that there is a layer of petroleum oxide film on the outer surface of the sanitary pipe. This requires us to popularize the installers with some problems and specific solutions encountered in the early stage of installation. During the installation process, the product is beaten with different strengths-this is a taboo. When the product is knocked, the oxide film on the surface of the stainless steel tube will be damaged, and the performance of the product will be affected. It is important to use professional tools to operate the product in the right place.

Second, stainless steel pipes of different materials cannot be welded, because the elements contained in each material are different. If forced welding, it will affect product performance and later service life.

Third, when the stainless steel pipe is clamped and quickly installed, a gasket should be added at an appropriate place to enhance the tightness of the stainless steel pipe excuse and prevent the occurrence of gas leak and liquid leakage.

Hygienic seamless tubings for later maintenance:

The maintenance and treatment of wolfberry is very important. Reasonable maintenance can not only make the factory safe production, but also increase the life and aesthetics of stainless steel pipes. The later maintenance of stainless steel pipes is mainly awakened by the oxide film. The oxide film can not only prevent the stainless steel pipe from corrosion and rust, but also prevent the stainless steel pipe from being oxidized and deteriorated by air.