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.


European And American Aircraft Subsidies War, Red Wine, Cheese, Whisky Suffered

European And American Aircraft Subsidies War, Red Wine, Cheese, Whisky Suffered

The 15-year mutual subsidy war between Boeing and Airbus is evolving into a dispute between the Trump administration and Europe for reciprocal tariff retaliation.


After the World Trade Organization (WTO) made a final ruling allowing the United States to impose tariffs on nearly 7.5 billion EU products, including goods and services, the US Trade Representative Office (USTR) quickly issued a statement to announce victory and announced a detailed sign. A list of taxes, in which the United States will impose a 10% tariff on large-scale civil aircraft in the EU and a 25% tariff on EU agricultural products and industrial products. The First Financial Reporter combed all the final decisions made by the WTO from 1999 to the present and found that this was the largest final decision in the history of the WTO.

However, comparing this list with the scope of the proposed USR’s proposed taxation, it can be seen that Boeing’s most wanted tax on Airbus aircraft parts does not appear on the final list.

The reason is that Airbus opened a factory in Alabama in 2015, and the Trump administration believes that if the tax on Airbus aircraft parts, it may cause the state’s support for the Trump administration. damage.

As Richard Aboulafia, an aviation analyst at Teal Group in the United States, pointed out, “This is a victory for Boeing, but this victory may have unintended consequences, and It does not meet the interests of Boeing.”

The chairman of the European Commission pointed out that if the United States imposes tariffs on EU goods, the EU will respond in the same way. “Europe will always defend free and fair trade under the principle of mutual benefit, if anyone wants to impose tariffs on our goods. , we will respond in the same way,” he said.

The French National Federation of Agricultural Operators’ Unions (FNSEA) stated in a statement: “The addition of a 25% tariff on non-bubble wines, cheeses and French pork will affect markets with a value of more than 1 billion euros.”

Posted By sanitary pipe fittings Wellgreen.


Sanitary Fittings in Coupling

Sanitary Fittings Coupling

A sanitary coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings also called聽adapters and do not normally allow disconnection of the shafts during operation, but there are torque limiting couplings that can slip or disconnect when the torque limit is exceeded.

The main purpose of the couplings is to connect two pieces of rotating equipment while allowing some degree of misalignment or final movement or both. With careful selection, installation and maintenance of fittings, substantial savings can be achieved by reducing maintenance costs and downtime. In a more general context, a coupling may also be a mechanical device for connecting the ends of adjacent parts or objects.

rubber hose adapter coupling

Shaft聽couplings are used in multi-purpose machines. The most common are:

1. To transfer energy from one end to another (eg transfer power from motor to pump coupling) Primary function.

2. To provide connection of separately manufactured unit shafts, such as motor and generator, and provide for disconnection for repairs or modifications.

3. To predict tree misalignment or introduce mechanical flexibility.

4. To reduce the transmission of shock loads from one tree to another.

5. To introduce overload protection.

6. To modify the vibration characteristics of rotating units.

7. To connect the pipe and the driven part

8. To maintain hygienic conditions by utilizing聽hygienic fittings.


What’s The Difference Between 304 And 316 Stainless Steel

Physical Properties and Different Of 304 And 316 Stainless Steels

The working temperature of 304 stainless steel is below 800 掳C,聽 the working temperature of 316 stainless steel is below 1000 掳C.


Chemical component of stainless steel 304 series and 316 series


Types C max Mn max P max C max Si max Cr Ni Mo other
304 0.08 2.0 0.045 0.03 1.0 18-20 8-12 ?
304L 0.03 2.0 0.045 0.03 1.0 18-20 8-12
316 0.08 2.0 0.045 0.03 1.0 16-18 10-14 2-3
316L 0.03 2.0 0.045 0.03 1.0 16-18 10-14 2-3 ?

1. The hardness of stainless steel 316 and 304 is almost indistinguishable, but the corrosion resistance of 316 is better than 304.

2. 316 is a type of molybdenum containing stainless steel. 316 stainless steel also has good chloride attack properties when the concentration of sulfuric acid is below 15% and above 85% under high temperature conditions. Its corrosion resistance is better than 304 stainless steel. 316 stainless steel has good corrosion resistance in the production process of papermaking, and 316 stainless steel is also resistant to the erosion of marine and aggressive industrial atmosphere.

316 stainless steel has good oxidation resistance in intermittent use below 1600 掳C and continuous use below 1700 掳C.

It is best not to continuously apply 316 stainless steel in the range of 800-1575 degrees, but when 316 stainless steel is continuously used outside this temperature range, the stainless steel has good heat resistance.

316L stainless steel has better carbide precipitation resistance than 316 stainless steel and can be used in the above temperature range.

3, 316 stainless steel is widely used in industry, hardware, electronics, metallurgy industry and many ways. Because there are many problems that need to be solved, including price and raw material issues. Therefore, this high-energy product is as complicated as a capillary tube, and the price of each component of a multi-element component is very expensive, which is why the 316 stainless steels are more expensive than the 304 stainless steels.

Both 304 and 316 stainless steel can be processed into sanitary pipe fittings, sanitary valves, etc., so the material can be selected to maximize the benefit by combining actual conditions.

check valve

Why Is The Union End Sanitary Check Valve A Better Choice?

People like a check valve with union end

Sanitary valves are designed to maintain a high level of hygiene while maintaining a continuous flow of media. These valves are primarily used for highly viscous liquids such as gels and ice cream. Hygienic valves are widely used in the food and beverage industry because the valves are made of stainless steel that is easy to clean. Stainless steel also allows the liquid to flow smoothly. This is a very important feature, especially in the industry where viscous liquids are used. Check valves come in different sizes and sizes and they are usually small and simple.

check valve

There are different types of check valves on the market, but in fact we talk about sanitary check valves, we will discuss its characteristics and where it can be applied. The advantage of this valve is that it can be attached to almost any pipe system or even a pump. It also features low maintenance costs. This is the best option for manufacturers who want to stay hygienic. Here, we will discuss sanitary check valves with unions.

Hygienic check valves with joint connections are also known as backflow prevention valves. This valve is designed to prevent fluid backflow. It is a spring-loaded, clamp-type check valve designed with corrosion-resistant materials to prevent contamination. This is because it allows the passage of high viscosity fluids and particulate materials. The valve is designed to close when the pressure under the plug exceeds the pressure plug and spring force and can only be closed during pressure equalization.

The valve is designed with the latest technology to minimize the possibility of leakage. Since the valve body is made of 304 or 316 series stainless steel, this means that it is less likely to contaminate the fluid and is easier to install. In addition, it has low maintenance costs and is designed with a smooth lining to allow smooth flow of the media. A sanitary check valve with a joint connection is the best valve that anyone can use to prevent backflow of media.