635 S17600 - ASTM A705/A705M-2023

Grade	635
USA UNS	S17600
Corresponding Standard	ASTM A705/A705M-2023 Standard Specification for Age-Hardening Stainless Steel Forgings
Classification	Precipitation-Hardening Stainless Steel

635 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Ti	Al
Minimum Value	-	-	-	-	-	16	6	0.4	-
Maximum Value	0.08	1	1	0.04	0.03	17.5	7.5	1.2	0.4

635 Mechanical Properties

Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
	Solution Treatment: 1040±15 °C（air cool）	≥825	≥515	≥10	≥45	HRC:≤32 HB≤302
H950	Hardening or Aging Treatment, 510℃ 0.5h air cool	≥1310	≥1170	≥8	≥25	HRC:≥39 HB≥363
H1000	Hardening or Aging Treatment, 540℃ 0.5h air cool	≥1240	≥1100	≥8	≥30	HRC:≥37 HB≥352
H1050	Hardening or Aging Treatment, 565℃ 0.5h air cool	≥1170	≥1035	≥10	≥40	HRC:≥35 HB≥331

* （L）：Longitudinal；（T）：Transverse。

① Either Rockwell C hardness or Brinell is permissible. On sizes of 12.70 mm and smaller, Rockwell C is preferred.

Approximate Comparison Table Precipitation Hardening Heat-Resistant Steel

635 Corresponding Standards(Same grade name, different standards)

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