Stainless Steels

Surface treatment and maintenance are required to protect iron from its tendency to rust. From the need to prevent this loss to rust came the developments of rust-free steel and stainless steel. To prevent rust, at least 10.5 percent chromium is used to form a fine oxidation (passive) film on the surface of the steel. Nippon Yakin produces a variety of stainless steel products superior to conventional stainless steel. Features of these products include resistance to heat, grain boundary corrosion, stress corrosion cracking and weather as well as being highly formable, machinable, and strong with or without being magnetizable.

Nippon Yakin Grade UNS Yield Strength
(N/mm2)
Tensile Strength
(N/mm2)
Elongation
(%)
Hardness
HRB HV HB
NAS 301 S30100 ≥ 205 ≥ 520 ≥ 40 ≤ 95 ≤ 218 ≤ 207
NAS 304 S30400
S30409
≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 305 S30500 ≥ 175 ≥ 480 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 316 S31600
S31609
≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 317 S31700 ≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 301L S30103 ≥ 215 ≥ 550 ≥ 45 ≤ 95 ≤ 218 ≤ 207
NAS 304L S30403 ≥ 175 ≥ 480 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 347 S34700 ≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 316L S31603 ≥ 175 ≥ 480 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 317L S31703 ≥ 175 ≥ 480 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 304MK ≥ 155
≤ 255
≥ 450
≤ 600
≥ 55 ≤ 80 ≤ 155 ≤ 187
NAS 304DJ ≥ 155 ≥ 450 ≥ 55 ≤ 90 ≤ 200 ≤ 187
NAS 304SS S30400
S30409
≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 303AM S30300 ≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 301N ≥ 245 ≥ 690 ≥ 30 ≤ 95 ≤ 220
NAS 304N2 ≥ 345 ≥ 690 ≥ 35 ≤ 100 ≤ 260 ≤ 248
NAS 309S S30908 ≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187
NAS 310S S31008 ≥ 205 ≥ 520 ≥ 40 ≤ 90 ≤ 200 ≤ 187

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