635 S17600 - ASTM A564/A564M-2019

Grade	635
USA UNS	S17600
Corresponding Standard	ASTM A564/A564M-2019(a) Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes
Classification	Precipitation-Hardening Stainless Steel
Properties	Corrosion Resistance

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

condition	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
Steel	Solution treatment (A): 1040±15°C (air quenching)	≥825	≥515	≥10	≥45	HRC: ≤32 HB: ≤302
Steel	Quenching and/or Aging (H950): 510°C hold for 0.5h air cooling	≥1310	≥1170	≥8	≥25	HRC: ≥39 HB: ≥363
Steel	Quenching and/or Aging (H1000): 540°C hold for 0.5h air cooling	≥1240	≥1100	≥8	≥30	HRC: ≥37 HB: ≥352
Steel	Quenching and/or Aging (H1050): 565°C hold for 0.5h air cooling	≥1170	≥1035	≥10	≥40	HRC: ≥35 HB: ≥331

Approximate Comparison Table Precipitation Hardening Heat-Resistant Steel

635 Corresponding Standards(Same grade name, different standards)

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