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Grade 634
USA UNS S35500
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
634 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N
Minimum Value 0.1 - 0.5 - - 15 4 2.5 0.07
Maximum Value 0.15 0.5 1.25 0.04 0.03 16 5 3.25 0.13
634 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Steel Solution treatment (A): 1040±15°C, quenching, hold at ≤-75°C for at least 3h.* HB: ≤363
Steel Quenching and/or Aging (H1100):
955°C hold for at least 10min but not exceeding 1h, water quenching. Cool to below -75°C and hold for 3h. Temper at 540°C for at least 3h.		 ≥1170 ≥1070 ≥12 ≥25 HRC: ≥37
HB: ≥341
634 Corresponding Standards(Same grade name, different standards)
1 ASTM A564/A564M-2019(a)
634 S35500
2 ASTM A693-2013
634 S35500
3 ASTM A959-2019
634 S35500
4 ASTM A705/A705M-2023
634 S35500

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