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.

Hygienic Non-retention Ball Valve

Hygienic Non-retention Ball Valve for UK

Hygienic Non-retention Ball Valves Were Shipped

1 1/2″ hygienic non retention ball valve for UK was shipped before Chinese Labour Day holiday. This time is tally 40pcs for UK market of one our our reputed client, it will be used a hygienic equipment.

Hygienic Non-retention Ball Valve-1

This sanitary ball valves are our clamped type on retention ball valve, it is easy for cleaning. The valve body and trim are SS316, PTFE seat, surface polish is better than 0.8?m. We finish the order in 15 days because the urgent requirement from client, and ship it to UK by TNT.

We are looking forward to get a new order from the client. Maybe some sanitary plug valve will come by next time?

What is Non-retention Ball Valve:

The fundamental difference between non-retention ball valve and a normal ball valve is the design of the sealing.

The non-retaining ball valve usually refers to the sanitary ball valve, which prevents the residual dead space of the medium, with no residual and aseptic

The ball and the seal of the ordinary ball valve usually have small gaps, and the medium will have some residual after over-flow.

Principle of non-retention ball valve: In the valve body, the left and right valve covers are respectively provided with a filling sealing seat for preventing the medium from entering the cavity, and the filling sealing seat has a semi-circular groove which matched with the spherical surface of the ball. At the bottom of the groove, there are flow passage holes matching the media flow passages of the left and right bonnets, and the ball is placed in the two filling seal seats and is sealed with the grooves of the two filling seal seats.

The effective design is that in the cavity of the valve body, the cavity space are filled by two filling sealing seats, it made the medium cannot enter the cavity of the valve body when the ball rotates, to get the result of non-retention purpose of the ball valve. At the same time, it can effectively prevent the medium from touching the inner surface of valve body, avoiding inside corrosion, and ensuring the hyginiec level requirements of the ball valve.

Wellgreen provides 2 type of non-retention ball valve for hygienic application. One is clamped design and it is very easy for cleaning. Another is 3 pcs non-retention ball valve. Click here to check the dimension.

For more information about Hygienic Non-retention Ball Valve, please contact us.

How To Choose The Actuator Of The Sanitary Valve, Pneumatic Or Electric?

Introduction to pneumatic actuators and electric actuators

An actuator is a device that is responsible for moving or controlling a mechanism or system. The actuator for sanitary valves is operated by a power source, whether the operator turns the valve handle, the pneumatic cylinder or the electric motor. The two most common automatic actuators in the sanitary industry are electric and pneumatic actuators.

This article describes each actuator type and what to consider when specifying one of these for sanitary valve applications.

Pneumatic actuators

Pneumatic actuators are the most common type of automatic valve actuators we specify. Pneumatic actuators typically include pistons, cylinders and valves or ports. The piston is sealed to the cylinder wall by an O-ring or some other type of elastomeric seal. Some pneumatic actuators use a diaphragm instead of a piston. The diaphragm holds air in the upper portion of the chamber, allowing air pressure to force the diaphragm/piston down, moving the actuator rod, and actuating the valve.

Most pneumatic actuators will use a supply pressure of 40-120 PSI, with the most common pressure range being 60-80 PSI. Higher air pressures may be difficult to guarantee and maintain, while lower pressures will require very large pistons to produce the torque required to actuate the valve.

Pneumatic actuators usually contain an additional spring for fail-safe operation. In fail-safe actuators, when the air supply is interrupted, the spring drives the valve back to the desired position – open or closed. This is the source of the nomenclature for pneumatic actuators.

There are three types of pneumatic actuators:

  • Air turns on (normally closed)
  • Air turns off (normally open)
  • Air to air, or dual action

The double acting actuator has no fail-safe spring and relies on a supply valve to pressurize and release the actuator and change the valve position.

Electric Actuator

Electric actuators use a power source – the most common is a 110 volt AC power source that drives the motor, produces torque and changes valve position. Electric actuators are commonly used in applications where air is not readily available. They are easy to interface and interface with existing control systems, especially in control or modulation applications.

However, electric actuators have some drawbacks. First, electric actuators are usually much slower than pneumatic actuators. Although pneumatic actuators may stall, the stalling of electric actuators can result in excessive current consumption and potentially dangerous conditions. Electric actuators are also generally more expensive than pneumatic actuators. Despite these limitations, it is worth noting that position feedback and valve control devices and wiring are generally simpler than pneumatic devices that require an interface for pneumatic and electrical energy supply.

Electric actuators are typically used for quarter turn valves, such as sanitary ball valves or butterfly valves. Pneumatic actuators are available for quarter-turn valves as well as linear valves such as sanitary diaphragms and stem/seat type valves.

So which actuators should you take for your hygienic fittings-valves system? As you can see, it depends on several different factors, but if you are looking for a cheap, easy to install and sturdy actuator, use pneumatics. They are available in a variety of different sizes and torque values ??depending on your application. If you don’t have a ready-to-use air supply or are looking for something that can be easily connected and installed, then choose electric. If you have further questions, please contact us immediately.


The Same And Different Parts of BPE And 3A Pipe Fittings

The Same and The Differences between BPE And 3A Pipe Fittings

In sanitary piping systems, BPE fittings and 3A fittings are two very common types of fittings. However, it may be difficult for people unfamiliar with it to distinguish between conventional and 3A fittings as well as BPE fittings. This article will introduce the similarities and differences between the two fittings.

First of all, what are the similarities between the two? Both BPE and 3A fittings are considered sanitary. Both measure the outer diameter of the tube in the same manner as the sanitary tube. This means you can solder two fitting types together. The size of the clamps is also the same. This is a similar place, and the rest of this article highlights some of the differences between the two.

The root of 3A fittings lies in the dairy industry. They are marked with a 3A symbol to let customers know that these fittings are specifically designed for dairy applications. With the development of the industry, ASMEBPE has developed its own fittings standard. These fittings have an extended section to accommodate the extensive use of rail horns in welding procedures used in the connection of pharmaceutical fittings. BPE fittings dimensions are requirements outlined in the bioprocess equipment standard. The BPE fittings are specifically designed to be fully drained when properly installed.


Another difference that should be emphasized is material availability. 3A fittings are usually available in 304 and 316 steel, and BPE fittings are available in 316L steel only. The I-LINE BPE fittings you have seen, the answer is definitely no, because BPE only has special welding and clamping ports. There are no other sanitary fitting styles such as I-LINE, John Perry or Q-LINE.

Surface treatment

Both 3A and BPE聽fittings have what we consider to be a surface finish. Hygienic surface treatment is generally considered to be any surface treatment of 32 Ra or better. 3A fittings meet this specification and often exceed it. However, there are several additional specifications for BPE fittings.

Why The Sanitary Diaphragm Valve Is The First Choice For The Biopharmaceutical Industry?

A Kind of Most Purity Straight-Through Valves

Sanitary diaphragm valves are known as “clean valves.” They are the first choice in the biopharmaceutical industry because they are ideal for ultra-pure and sensitive media requiring unobstructed flow, throttling and positive shutdown. The sanitary diaphragm valve is the only truly clean straight-through valve in pharmaceutical applications. All other suitable valves are 90 degree valves.

The hygienic diaphragm isolates the process medium from the environment and all moving parts of the valve, protecting the media from contamination while preventing it from interfering with valve operation. Premium diaphragms also offer excellent steam resistance and long-term durability.

Sanitary diaphragm valve features

The valve body does not have any entrainment area and is also self-draining when installed in a line with 2 degrees of inclination.

Most sanitary diaphragm valves bodies are made of forged 316L stainless steel. The porosity of the forgings is much lower than that of the castings. This will polish the valve to a surface finish as low as 10RA.

They can also be electropolished for better surface finish.

The simple design of the sanitary diaphragm body allows it to be configured with multiple valves in a single block tailored to the specific application.

Sanitary diaphragm valves are “top inlet” valves. The bonnet and diaphragm can be repaired without removing the valve body from the production line. This allows the valve to be welded in place or clamped from the system.


AK Steel’s Third Quarter Of 2018 Achieved The Best Results In The Same Period In The Past 10 Years

AK Steel’s third quarter results summary for 2018

The performance report released by AK Steel of the United States shows that its performance in the third quarter of 2018 was the highest in the last 10 years, thanks to good market conditions and focus on value-added products.

In the third quarter of 2018, shipments of flat rolled products increased from 1,366,600 tons in the same period of the previous year to 1,424,000 tons (including stainless steel/silicon steel shipments increased by approximately 4.8% to 206,600 tons), and the average selling price. From $1021.1/ton to $1,114/ton, net sales increased by about 16% year-on-year to $1,735.6 million. The quarter’s gross operating profit (EBITDA) was $182.3 million, a year-on-year increase of nearly 33.2%, adjusted to $160.8 million, the highest in the same period in 10 years since 2008; net profit was $67.2 million, significantly higher than the same period last year. $22.3 million. Liquidity at the end of the quarter was $953.5 million.

In the first three quarters of 2018, shipments of flat rolled products increased from 4,529,100 tons in the same period last year to 4,294,700 tons (including stainless steel/silicon steel shipments increased by 1.8% year-on-year to 628,800 tons), and the average selling price was from From $1022/ton to $1,087/ton, net sales increased by approximately 12.1% year-on-year to $5,141.1 million. Earnings operating profit (EBITDA) for the first three quarters was $489 million, down about 6.3% year-on-year. After adjustment, it fell about 7.2% year-on-year to $427.9 million. Net profit was $152.5 million, down from $183.9 million in the same period last year.

Choosing Wellgreen hygienic fittings is a wise choice.

Hot Rolled Steel

GQMT Will Conduct Trial Production Of Hot Rolled Steel In January At The Earliest

Guangqing HOT聽Rolled STEEL Project

Hot Rolled Steel

It is reported that Guangqing(GQMT)’s 3 million tons 1780mm wide-width hot-rolling steel project has entered the final stage. It is expected that the trial production will be ushered in the fastest in January 2019. At that time, Guangqing will be able to directly produce 304 stainless steel black serious products.

According to the official introduction, the Yangjiang Guangqing stainless steel hot rolling project has a total investment of about 2 billion. The hot rolling line is currently the world’s most advanced general-purpose 1780 hot rolling line. Its main features are large production scale and low energy consumption. The cost is low, the degree of mechanization and automation is high, and it can be produced in large quantities. The daily output can reach 10,000 tons, and the annual production capacity can reach 3 million tons.

After Guangqing hot rolling is put into production, considering the current hot carbon market, the trend has already gone. At that time, it is very likely that the product structure will be adjusted, and some of its production of carbon steel products will be adjusted back to the production of stainless steel’s (Check wellgreen’s sanitary flanges ). In order to realize that its hot-rolled products can be directly marketed, it has already been equipped with a hot-rolled pickling stainless steel project.


A China’s E-commerce Platform Suspected Of Selling For Fake Wines

A China’s e-commerce platform called “Pinduoduo” has been continually being spotted by a number of well-known foreign media. Media surveys such as the British “Daily Mail”, the Australian “The Diplomat”, the New Zealand “The Herald” (NZ Herald), and the US “Foreign Policy” found that “Pinduoduo”‘s Imported food is suspected of being sold for fake.

The media survey on the “Pinduoduo” found that Penfords, the wine brand of Australia’s largest wine producer Treasury Wine Estates, has been sold by a number of merchants with a letter of 鈥淏enfords鈥.

鈥淭his cheaper wine has the potential to challenge legitimate wines in the Chinese market and has already achieved high profits.鈥 The Daily Mail found that on the “Pinduoduo”, only merchants sold more than 1,000 cases of six bottles of counterfeit. Penfolds “Benfords Hyland” wine, priced at $ 117 per case. In Australia, the retail price for a single box is $278.

Hendrik Laubscher, the co-author of Forbes magazine, founder and CEO of South Africa’s digital retail research company Blue Cape Ventures, believes that the large number of counterfeit problems that exist in the fight for a regular brand will be A “nightmare” and believe that the “Pinduoduo” pattern is not sustainable.

Sanitary stainless steel 90 degree elbow

What Is The Difference Between Sanitary Pipe Fittings And Stainless Steel Pipe Fittings?

What Is The Difference Between Sanitary Pipe Fittings And Stainless Steel Pipe Fittings?

What is a sanitary fitting?

Industrial pipe fittings are relatively well understood, but sanitary pipe fittings are not. The role of sanitary pipe fittings and materials are basically the same as those of industrial stainless steel pipe fittings. However, they are used in sanitary and food industries, and can be classified into welding, threaded and clamped types according to the connection method.

What is the difference between stainless steel sanitary fittings and ordinary stainless steel fittings?

Sanitary stainless steel 90 degree elbow

Sanitary stainless steel 90 degree elbow from Wellgreen

The biggest difference between sanitary fittings is that there are more conditions to be met and production is more stringent. Sanitary fittings must meet these requirements:

1. Control caliber: DIN standard (DN10-DN150), 3A/IDF standard (1/2″-12″), ISO standard (?12.7-?319.3);

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

3, product materials: stainless steel 304, 304, 316, 316L, etc.;

4, quality and use: fast-installed joints inside and outside with high-grade 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

7, product quality: in line with export and national implementation of high-pressure pipe fittings product standards