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Steel Grade Of Seamless Stainless Steel Pipe

Attention:     Issuing time:2019-11-27 09:55
Steel grade classification and comparison table of seamless stainless steel pipe

Stainless steel grade group:
200 series - chromium nickel manganese austenitic stainless steel
300 series - chromium nickel austenitic stainless steel
Model 301 - good ductility, for forming products. It can also be hardened quickly by machining. Good weldability. The wear resistance and fatigue strength are better than 304 stainless steel.
Model 302 - the corrosion resistance is the same as 304, because the carbon content is relatively high, so the strength is better.
Model 303 - it is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
Model 304 - general model, i.e. 18 / 8 stainless steel. GB brand is 0Cr18Ni9
Model 309 - better temperature resistance than 304.
Model 316 - the second most widely used steel after 304. Seamless stainless steel tube is mainly used in food industry and surgical equipment. Molybdenum element is added to obtain a special corrosion-resistant structure. It is also used as "marine steel" because it has better chloride corrosion resistance than 304. SS316 is commonly used in nuclear fuel recovery units. Grade 18 / 10 stainless steel also generally meets this application level.
Model 321 - performance similar to 304 except that the addition of titanium reduces the risk of corrosion of material welds.
400 series - Ferritic and martensitic stainless steel
Model 408 - good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
Model 409 - the cheapest model (British and American), usually used as automobile exhaust pipe, is ferritic stainless steel (chrome steel).
Model 410 - martensite (high strength chromium steel), good wear resistance, poor corrosion resistance.
Model 416 - added sulfur, improved material processing performance.
Model 420 - "cutting tool grade" martensitic steel, similar to Brinell high chromium steel, the earliest stainless steel. It is also used for surgical knives, which can be made very bright.
Model 430 - ferritic stainless steel, for decoration. Seamless stainless steel tubes, for example, are used for car accessories. Good formability, but poor temperature resistance and corrosion resistance.
Model 440 - high strength cutting tool steel, with slightly higher carbon content, can obtain higher yield strength after proper heat treatment, and the hardness can reach 58hrc, which is one of the hardest stainless steels. The most common application example is "razor blade". There are three common models: 440A, 440b, 440C, and 440f (easy to process).
500 series - heat resistant chromium alloy steel.

600 series - Martensitic precipitation hardening stainless steel.
Model 630 - the most commonly used precipitation hardening stainless steel model, also known as 17-4; 17% Cr, 4% Ni.
Steel grade comparison table of seamless stainless steel pipe

SUS 304 304 S30400 X5CrNi18-10 1.4301
SUS 304L 304L S30403 X2CrNi19-11 1.4306
0Cr25Ni20 SUS 304S 304S S31008 X12CrNi25-21 1.4845
0Cr17Ni12Mo2 SUS 316 316 S31600 X5CrNiMo17-12-2
00Cr17Ni14Mo2 SUS 304L 304L S31603 X2CrNiMo18-14-3 1.4435
0Cr19Ni13Mo3 SUS 317 317 S31700 X2CrNiMo17-13-3 1.4439
SUS 317L 317L S3703 X2CrNiMo18-16-4 1.4438
(1Cr18Ni9Ti)       X12CrNi18-9 1.4878
0Cr18Ni10Ti SUS 321 321 S32100 X6CrNiTi18-10 1.4541
0Cr18Ni11Nb SUS 347 347 S34700 X6CrNiNb18-10 1.4550

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