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 Kogyo 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.

  • Designation
  • Standard
  • Chemical Composition
  • Major Applications
  • Mechanical
Nippon Yakin Grade UNS EN / DIN JIS
NAS 301 S30100 ー SUS 301
NAS 304 S30400
S30409		 1.4301 SUS 304
NAS 305 S30500 ー SUS 305
NAS 316 S31600
S31609		 ー SUS 316
NAS 317 S31700 ー SUS 317
NAS 301L S30103 ー SUS 301L
NAS 304L S30403 ー SUS 304L
NAS 347 S34700 ー SUS 347
NAS 316L S31603 1.4435 SUS 316L
NAS 317L S31703 ー SUS 317L
NAS 304MK ー ー SUS 304J2
NAS 304DJ ー ー SUS 304J1
NAS 304SS S30400
S30409		 1.4301 SUS 304
NAS 303AM S30300 ー SUS 303
NAS 301N ー ー ー
NAS 304N2 ー ー SUS 304N2
NAS 309S S30908 ー SUS 309S
NAS 310S S31008 ー SUS 310S
Nippon Yakin Grade UNS ASME ASTM DIN EN
NAS 301 S30100 ー A240 ー ー
NAS 304 S30400
S30409		 SA-240 A240 ー EN10028-7
NAS 305 S30500 ー A240 ー ー
NAS 316 S31600
S31609		 SA-240 A240 ー ー
NAS 317 S31700 ー A240 ー ー
NAS 301L S30103 ー A240 ー ー
NAS 304L S30403 ー A240 ー ー
NAS 347 S34700 SA-240 A240 ー ー
NAS 316L NAS 316L SA-240 A240 DIN17440
DIN17441		 EN10088-2
NAS 317L S31703 SA-240 A240 ー ー
NAS 304MK ー ー ー ー ー
NAS 304DJ ー ー ー ー ー
NAS 304SS S30400
S30409		 SA-240 A240 ー EN10028-7
NAS 303AM S30300 ー A895 ー ー
NAS 301N ー ー ー ー ー
NAS 304N2 ー ー ー ー ー
NAS 309S S30908 SA-240 A240 ー ー
NAS 310S S31008 SA-240 A240 ー ー
Nippon Yakin Grade UNS Chemical Composition
NAS 301 S30100 Standard Type 17 Cr-7 Ni
NAS 304 S30400
S30409		 18 Cr-8 Ni
NAS 305 S30500 18 Cr-12 Ni
NAS 316 S31600
S31609		 17 Cr-12 Ni-2.5 Mo
NAS 317 S31700 18 Cr-12 Ni-3.5 Mo
NAS 301L S30103 Intergranular Corrosion Resistance 17 Cr-7 Ni-low C-N
NAS 304L S30403 18 Cr-10 Ni-low C
NAS 347 S34700 18 Cr-9 Ni-Nb
NAS 316L S31603 18 Cr-12 Ni-2.5 Mo-low C
NAS 317L S31703 18 Cr-12 Ni-3.5 Mo-low C
NAS 304MK ー For Forming 16 Cr-7 Ni-4 Mn-2 Cu
NAS 304DJ ー 17 Cr-7 Ni-2 Cu
NAS 304SS S30400
S30409		 18 Cr-8 Ni
NAS 303AM S30300 Free-Machning 18 Cr-8 Ni-high S
NAS 301N ー High Strength 17 Cr-7 Ni-N
NAS 304N2 ー 18 Cr-8 Ni-N-Nb
NAS 309S S30908 Heat Resistance 22 Cr-12 Ni
NAS 310S S31008 25 Cr-20 Ni
Nippon Yakin Grade UNS Major Applications
NAS 301 S30100 A material with lower chromium and nickel than SUS 304 for superior work hardening. Coil springs, bolts, nuts
NAS 304 S30400
S30409		 A general-use stainless steel. Provides an excellent balance of properties while being easy to use. Food equipment, general chemicals, daily goods
NAS 305 S30500 Provides lower work hardening than SUS 304. Spinning, cold forging
NAS 316 S31600
S31609		 A form of SUS 304 with molybdenum added for superior pitting corrosion resistance and little magnetism after working.
NAS 317 S31700 A material with pitting corrosion resistance enhanced over SUS 316. Outer plates for equipment
NAS 301L S30103 A low-carbon form of SUS 301 with grain boundary corrosion resistance and superior weldability. Railroad cars
NAS 304L S30403 A material with less carbon and more nickel than SUS 304. Resistant to rust and providing excellent grain boundary corrosion resistance. Parts that cannot be heat treated after welding
NAS 347 S34700 Containing neodymium, this provides a high level of resistance to grain boundary corrosion.
NAS 316L S31603 A form of SUS 316 steel with an extremely low level of carbon to provide a high level of grain boundary resistance.
NAS 317L S31703 A form of SUS 317 with a low level of carbon to provide a high level of grain boundary resistance.
NAS 304MK ー A form of SUS 304 with added copper for excellent cold workability and non-magnetism. Bolts, nuts
NAS 304DJ ー An SUS 304 base with lower nickel and higher copper for cold formability and particularly favorable deep drawing. Sinks, warm water tanks
NAS 304SS S30400
S30409		 For deep drawing and stretch forming
NAS 303AM S30300 A highly machinable stainless steel with improved cuttability and burning resistance, though less resistant to corrosion. Bolts, nuts
NAS 301N ー Stainless steel made from SUS 301 with nitrogen added for strength. Coil springs, bolts, nuts
NAS 304N2 ー A metal made from SUS 304 with nitrogen and neodymium added for strength while maintaining a high level of extendibility. Applications similar to 304N1
NAS 309S S30908 A stainless steel providing superior resistance to heat and corrosion over SUS 304. For applications requiring resistance to heat.
NAS 310S S31008 Providing superior corrosion and heat resistance to SUS 309S. For uses requiring resistance to heat.
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 ー ≧ 155
≦ 255		 ≧ 450
≦ 600		 ≧ 55 ≦ 80 ≦ 155 ≦ 187
NAS 304DJ ー ≧ 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 ー ≧ 245 ≧ 690 ≧ 30 ≦ 95 ≦ 220 ー
NAS 304N2 ー ≧ 345 ≧ 690 ≧ 35 ≦ 100 ≦ 260 ≦ 248
NAS 309S S30908 ≧ 205 ≧ 520 ≧ 40 ≦ 90 ≦ 200 ≦ 187
NAS 310S S31008 ≧ 205 ≧ 520 ≧ 40 ≦ 90 ≦ 200 ≦ 187
Inquiries about painted stainless steel sheets
To Tokyo branch TEL.+81-3-3273-4621