tkMNA - Stainless Steel Chemical Compositions

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tkMNA - Stainless Steel Chemical C...


Alloy	UNS No.	Carbon	Chromium	Nickel	Manganese	Silicon	Sulfur	Phosphorus	Molybdenum	Others
301	S30100	0.15	16-18	6-8	2	1	0.03	0.04
302	S30200	0.15	17-19	8-10	2	1	0.03	0.04
303	S30300	0.15	17-19	8-10	2	1	.15 Min.	0.2	0.6
303 Project 70+®	S30300	0.12	17-19	8-10	2	1	.15 Min.	0.2
303SE	S30323	0.12	17-19	8-10	2	1		.12/.17		Se.15/35
304	S30400	0.08	18-20	8-12	2	1	0.03	0.04
304 Project 70+®	S30400	0.08	18-20	8-10.5	2	1	0.03	0.045
304L	S30403	0.03	18-20	8-12	2	1	0.03	0.04
304L Project 70+®	S30403	0.03	18-20	8-12	2	1	0.03	0.045
316	S31600	0.08	16-18	10-14	2	1	0.03	0.04	2.0-3.0
316 Project 70+®	S31600	0.08	16-18	10-14	2	1	0.03	0.045	2.0-3.0
316L	S31603	0.03	16-18	10-14	2	1	0.03	0.04	2.0-3.0
316L Project 70+®	S31603	0.03	16-18	10-14	2	1	0.03	0.045	2.0-3.0
321	S32100	0.08	17-19	9-12	2	1	0.03	0.04		Titanium Min. 5xC
410	S41000	0.15	11.5-13.5		1	1	0.03	0.04
416	S41600	0.15	12-14		1.25	1	.15 Min.	0.06	0.6
416 Project 70+®	S41600	0.15	12-14		1.25	1	.15 Min.	0.06
420	S42000	.15 Min	12-14		1	1	0.03	0.04
430F	S43020	0.12	16-18	0.75	1	1	0.03	0.04
440C	S44004	.95 - 1.2	16-18		1	1	0.03	0.04	0.75
15-5	S15500	0.07	14-15.5	3.5-5.5	1	1	0.03	0.04		Copper 2.5/4.5; Cb and Ta .15/.45
17-4	S17400	0.07	15.5-17.5	3-5	1	1	0.03	0.04		Copper 5.0; Cb and Ta .45


Alloy	UNS No.	Carbon	Chromium	Nickel	Manganese	Silicon	Sulfur	Phosphorus	Molybdenum	Others
301	S30100	0.15	16-18	6-8	2	1	0.03	0.04
302	S30200	0.15	17-19	8-10	2	1	0.03	0.04
303	S30300	0.15	17-19	8-10	2	1	.15 Min.	0.2	0.6
303 Project 70+®	S30300	0.12	17-19	8-10	2	1	.15 Min.	0.2
303SE	S30323	0.12	17-19	8-10	2	1		.12/.17		Se.15/35
304	S30400	0.08	18-20	8-12	2	1	0.03	0.04
304 Project 70+®	S30400	0.08	18-20	8-10.5	2	1	0.03	0.045
304L	S30403	0.03	18-20	8-12	2	1	0.03	0.04
304L Project 70+®	S30403	0.03	18-20	8-12	2	1	0.03	0.045
316	S31600	0.08	16-18	10-14	2	1	0.03	0.04	2.0-3.0
316 Project 70+®	S31600	0.08	16-18	10-14	2	1	0.03	0.045	2.0-3.0
316L	S31603	0.03	16-18	10-14	2	1	0.03	0.04	2.0-3.0
316L Project 70+®	S31603	0.03	16-18	10-14	2	1	0.03	0.045	2.0-3.0
321	S32100	0.08	17-19	9-12	2	1	0.03	0.04		Titanium Min. 5xC
410	S41000	0.15	11.5-13.5		1	1	0.03	0.04
416	S41600	0.15	12-14		1.25	1	.15 Min.	0.06	0.6
416 Project 70+®	S41600	0.15	12-14		1.25	1	.15 Min.	0.06
420	S42000	.15 Min	12-14		1	1	0.03	0.04
430F	S43020	0.12	16-18	0.75	1	1	0.03	0.04
440C	S44004	.95 - 1.2	16-18		1	1	0.03	0.04	0.75
15-5	S15500	0.07	14-15.5	3.5-5.5	1	1	0.03	0.04		Copper 2.5/4.5; Cb and Ta .15/.45
17-4	S17400	0.07	15.5-17.5	3-5	1	1	0.03	0.04		Copper 5.0; Cb and Ta .45

Alloying Elements

Chromium — Most important element of stainless steel. An addition of 10% chromium will form an oxide film (passive surface film) which renders the steel corrosion resistant. Chromium also increases resistance to scaling.

Nickel — Second most important element. It increases ductility, corrosion resistance, scaling resistance, and high-temperature strength.

Silicon — Primarily increases resistance to scaling.

Manganese — Improves hot-working properties.

Molybdenum — Increases corrosion and high-temperature strength.

Sulfur-Phosphorus-Selenium — Increases machinability.

Titanium or Columbium-Tantalum — Stabilizes carbon and prevents chromium-carbide precipitation and subsequent intergranular corrosion.