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Stainless Steel Pipe Grades

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As for stainless steel pipe grades, you may feel confused to choose. There are 60+ grades of stainless steel, such as 201, 202, 304, 316L, 310s, 321, 309s, 304L, 408, 409, 410, 430, 630, etc. The different grades provide different strengths, corrosion & heat resistance, and other features. You need to choose according to the specified application or use environment. Let’s have a review.

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Different Grades of Stainless Steel Tubes

1. 200 Series

200 series austenitic stainless steel pipe is based on chromium-nickel austenitic stainless steel, to the steel to add manganese and nitrogen instead of nickel elements. Its austenitic elements, in addition to manganese and nitrogen, and generally a moderate amount of nickel (4% to 6%). Manganese in steel plays a role in stabilizing austenite. As nitrogen plays a good solid solution strengthening role, to improve the strength of austenitic stainless steel. Therefore, the 200 series of stainless steel pipes, suitable for heavy loads and corrosion resistance requirements are not too high equipment and components used.

200 Series Stainless Steel Pipe
200 Series Stainless Steel Pipe
300 Series Stainless Steel Pipe
300 Series Stainless Steel Pipe

2. 300 Series

Among the 300 series stainless steel tubes, 304 and 316 stainless steel tubes are the most widely used.

304 stainless steel tube: 304 stainless steel tube is more resistant to rust than the 200 series stainless steel material. It is also better in terms of high-temperature resistance. In addition, 304 stainless steel has excellent stainless corrosion resistance and better resistance to intergranular corrosion. As a result, it is often widely used to make equipment and machine parts that require good overall performance.

316 Stainless Steel Tube: 316 stainless steel tubing is the second most widely used steel grade after 304. 316 stainless steel tubes have better resistance to chloride corrosion than 304 stainless steel tubes and are therefore often used as marine steel. Besides, the addition of molybdenum to 316 stainless steel pipe increases its corrosion resistance, making it very suitable for use in the food industry and the medical sector.

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Food Grade Stainless Steel Tubes
304 SS Pipe for Faucet
304 Stainless Steel Faucet
316 SS Tubes for Hospital Equipment
Medical 316 Stainless Steel Tube

3. 400 Series

The following is a list of properties and uses of 400 series stainless steel tubes for your reference.

Grade Properties Uses
409L Corrosion and heat resistant Car exhausts, heat exchangers
410 High strength, good workability, magnetic Knife blades, machine parts
420J1 Hard, corrosion-resistant, and magnetic Tableware, turbine blades
420J2 Hard and magnetic Tableware, knife blades, valves
430 Low thermal expansion, oxidation resistant Household appliances, exterior decorative materials

The chromium content of 400 series stainless steel tubes is lower than that of 300 series stainless steel tubes. However, 400 series stainless steel tubes do not have the same problems with carbon deposits as 300 series. In addition, 400 series stainless steel can be heat treated and used in environments with high temperatures up to 1200F (approximately 393 degrees Celsius). In terms of strength, the 300 series is the same as the 400 series.

Stainless Steel Tube Used As Stair Guardrail
Stainless Steel Tubes are Used As Mechanical Parts
Mechanical Parts
Stainless Steel Tubes Are Used to Manufacture Tableware

4. 500 Series and 600 Series

500 Series – Heat Resistant Chromium Alloy Steels
600 Series – Martensitic precipitation hardening stainless steels

Compared to the other series, the 500 and 600 series stainless steel tubes are not as widely used. If you have any further questions about this, please feel free to contact us for more details.

Which Grade of Stainless Steel Tube Is Best?

The question is often asked which grade of stainless steel pipe is better. In fact, there is no such thing as good or bad. Each stainless steel pipe grades have their advantages and disadvantages, for example, 300 series stainless steel pipe is very rust-proof, but its price is very high. 400 series stainless steel pipe is relatively cheap compared with 300 series, but its rust-proof performance is lower than 300 series stainless steel pipe.

Therefore, the choice of which grade of stainless steel tube you choose should depend on your application and budget. If you are confused about which stainless steel tube to choose, you can choose to consult an expert. Wanzhi Steel offers this service to you, feel free to contact us for your stainless steel tube solution.

Stainless Steel Tubes in Wanzhi Steel
Stainless Steel Tubes in Wanzhi Steel
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Stainless Round Pipes in Stock
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As a leading steel pipe manufacturer and supplier in China, Wanzhi Steel offers steel tubes in different materials and grades, sizes and shapes. For stainless steel tube with different grades, they have different features, prices, and use environments. Wanzhi Steel is able to help you to choose the right stainless steel tube grades and types. Welcome to contact us for more information.