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Grade 630
USA UNS S17400
Corresponding Standard ASTM A705/A705M-2023
Standard Specification for Age-Hardening Stainless Steel Forgings
Classification Precipitation-Hardening Stainless Steel
630 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Nb
Minimum Value - - - - - 15 3 3 0.15
Maximum Value 0.07 1 1 0.04 0.03 17.5 5 5 0.45
630 Mechanical Properties
Thickness
t
mm		 Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
/ Solution Treatment: 1040±15 °C（cool as required to below 32 °C） HRC: ≤38
HB: ≤363
t≤75 (L) H900 Age Hardening: 480 °C, 1h, air cool ≥1310 ≥1170 ≥10 ≥40 HRC: ≥40
HB: ≥388
75＜t≤200 (L) H900 Age Hardening: 480 °C, 1h, air cool ≥1310 ≥1170 ≥10 ≥35 HRC: ≥40
HB: ≥388
t≤75 (L) H925 Age Hardening: 495 °C, 4h, air cool ≥1170 ≥1070 ≥10 ≥44 HRC: ≥38
HB: ≥375		 ≥6.8
75＜t≤200 (L) H925 Age Hardening: 495 °C, 4h, air cool ≥1170 ≥1070 ≥10 ≥38 HRC: ≥38
HB: ≥375		 ≥6.8
8≤t≤200 (L) H1025 Age Hardening: 550 °C, 4h, air cool ≥1070 ≥1000 ≥12 ≥45 HRC: ≥35
HB: ≥331		 ≥20
8≤t≤200 (L) H1075 Age Hardening: 580 °C, 4h, air cool ≥1000 ≥860 ≥13 ≥45 HRC: ≥32
HB: ≥311		 ≥27
8≤t≤200 (L) H1100 Age Hardening: 595 °C, 4h, air cool ≥965 ≥795 ≥14 ≥45 HRC: ≥31
HB: ≥302		 ≥34
8≤t≤200 (L) H1150 Age Hardening: 620 °C, 4h, air cool ≥930 ≥725 ≥16 ≥50 HRC: ≥28
HB: ≥277		 ≥41
/ H1150D Age Hardening: 620 °C, 4h, air cool plus Age Hardening: 620 °C, 4h, air cool ≥860 ≥725 ≥16 ≥50 HRC: 24~33
HB: 255~311		 ≥41
/ H1150M Age Hardening: 760 °C, 2h, air cool plus 620 °C, 4h, air cool ≥795 ≥520 ≥18 ≥55 HRC: ≥24
HB: ≥255		 ≥75
* （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.
1 Approximate Comparison Table Precipitation Hardening Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4
1
(ISO 683-13-1986) 		4542-174-00-I X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
2 Approximate Comparison Table Precipitation Hardening Heat-Resistant Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4 X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
630 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
630 S17400
2 ASTM A564/A564M-2019(a)
630 S17400
3 ASTM A693-2013
630 S17400
4 ASTM F899-2020
630 S17400
5 ASTM A959-2019
630 S17400
6 GB /T 41157.3-2022
630 05Cr17Ni4Cu4Nb
7 CNS 3477-2016
630
8 ASTM A705/A705M-2023
630 S17400

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