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TABLE 1 Chemical Requirements of Austenitic Stainless Steels
Grade |
Composition, % | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Carbon |
Manga- nese, max |
Phos- pho- rus, max |
Sul- fur, max |
Silicon, max |
Nickel |
Chromium |
Molybdenum |
Titanium |
Columbium plus Tantalum |
Selenium |
|
MT 302 | 0.08 to 0.20 | 2.00 | 0.040 | 0.030 | 1.00 | 8.0–10.0 | 17.0–19.0 | ... | ... | ... | ... |
MT 303 | 0.15 max | 2.00 | 0.20 | 0.15 min | 1.00 | 8.0–10.0 | 17.0–19.0 | ... | ... | ... | ... |
MT 303Se | 0.15 max | 2.00 | 0.040 | 0.040 | 1.00 | 8.0–11.0 | 17.0–19.0 | ... | ... | ... | 0.12–0.2 |
MT 304 | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 8.0–11.0 | 18.0–20.0 | ... | ... | ... | ... |
MT 304L | 0.035 maxA | 2.00 | 0.040 | 0.030 | 1.00 | 8.0–13.0 | 18.0–20.0 | ... | ... | ... | ... |
MT 305 | 0.12 | 2.00 | 0.040 | 0.030 | 1.00 | 10.0–13.0 | 17.0–19.0 | ... | ... | ... | ... |
MT 309S | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 12.0–15.0 | 22.0–24.0 | ... | ... | ... | ... |
MT 310S | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 19.0–22.0 | 24.0–26.0 | ... | ... | ... | ... |
MT 316 | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 11.0–14.0 | 16.0–18.0 | 2.0–3.0 | ... | ... | ... |
MT 316L | 0.035 maxA | 2.00 | 0.040 | 0.030 | 1.00 | 10.0–15.0 | 16.0–18.0 | 2.0–3.0 | ... | ... | ... |
MT 317 | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 11.0–14.0 | 18.0–20.0 | 3.0–4.0 | ... | ... | ... |
MT 321 | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 9.0–13.0 | 17.0–20.0 | ... | B | ... | ... |
MT 347 | 0.08 max | 2.00 | 0.040 | 0.030 | 1.00 | 9.0–13.0 | 17.0–20.0 | ... | ... | C | ... |
A For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness).
B The titanium content shall be not less than five times the carbon content and not more than 0.60 %.
C The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.00 %.
TABLE 2 Chemical Requirements of Ferritic and Martensitic Stainless Steels
Grade |
Composition, % | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Carbon, max |
Manga- nese, max |
Phos- phorus, max |
Sulfur, max |
Silicon, max |
Nickel |
Chromium |
Molyb- denum |
Aluminum |
Copper |
Nitrogen |
Selenium | |
Martensitic | ||||||||||||
MT 403 | 0.15 | 1.00 | 0.040 | 0.030 | 0.50 | 0.50 max | 11.5–13.0 | 0.60 max | ||||
MT 410 | 0.15 | 1.00 | 0.040 | 0.030 | 1.00 | 0.50 max | 11.5–13.5 | ... | ... | ... | ... | ... |
MT 414 | 0.15 | 1.00 | 0.040 | 0.030 | 1.00 | 1.25–2.50 | 11.5–13.5 | ... | ... | ... | ... | ... |
MT 416Se | 0.15 | 1.25 | 0.060 | 0.060 | 1.00 | 0.50 max | 12.0–14.0 | ... | ... | ... | ... | 0.12–0.20 |
MT 431 | 0.20 | 1.00 | 0.040 | 0.030 | 1.00 | 1.25–2.50 | 15.0–17.0 | ... | ... | ... | ... | ... |
MT 440A | 0.60 to 0.75 | 1.00 | 0.040 | 0.030 | 1.00 | ... | 16.0–18.0 | 0.75 max | ... | ... | ... | ... |
Ferritic | ||||||||||||
MT 405 | 0.08 | 1.00 | 0.040 | 0.030 | 1.00 | 0.50 max | 11.5–14.5 | ... | 0.10–0.30 | ... | ... | ... |
MT 429 | 0.12 | 1.00 | 0.040 | 0.030 | 1.00 | 0.50 max | 14.0–16.0 | ... | ... | ... | ... | ... |
MT 430 | 0.12 | 1.00 | 0.040 | 0.030 | 1.00 | 0.50 max | 16.0–18.0 | ... | ... | ... | ... | ... |
MT 443 | 0.20 | 1.00 | 0.040 | 0.030 | 1.00 | 0.50 max | 18.0–23.0 | ... | ... | 0.90–1.25 | ... | ... |
MT 446–1 | 0.20 | 1.50 | 0.040 | 0.030 | 1.00 | 0.50 max | 23.0–30.0 | ... | ... | ... | 0.25 max | ... |
MT 446–2A | 0.12 | 1.50 | 0.040 | 0.030 | 1.00 | 0.50 max | 23.0–30.0 | ... | ... | ... | 0.25 max | ... |
29-4 | 0.010 | 0.30 | 0.025 | 0.020 | 0.20 | 0.15 max | 28.0–30.0 | 3.5–4.2 | ... | 0.15 max | 0.020 max | ... |
29-4-2 | 0.010 | 0.30 | 0.025 | 0.020 | 0.20 | 2.0–2.5 | 28.0–30.0 | 3.5–4.2 | ... | 0.15 max | 0.020 maxB | ... |
A MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness.
B Carbon plus nitrogen = 0.025 max %.