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Grade 630
USA UNS S17400
Corresponding Standard ASTM A693-2013
Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
Classification Precipitation-Hardening Stainless Steel
630 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu More
Minimum Value - - - - - 15 3 3 Nb+Ta：0.15~0.45
Maximum Value 0.07 1 1 0.04 0.03 17.5 5 5
630 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
0.38≤t＜102 Solid Solution Treatment (HRC)
≤38
t<4.762 Precipitation Hardening, 482℃ ≥1310 ≥1170 ≥5 HRC 40~48
4.762＜t＜15.88 Precipitation Hardening, 482℃ ≥1310 ≥1170 ≥8 ≥25 HRC 40~48
15.9＜t＜102 Precipitation Hardening, 482℃ ≥1310 ≥1170 ≥10 ≥30 HRC 40~48
t<4.762 Precipitation Hardening, 496°C ≥1170 ≥1070 ≥5 HRC 38~46
4.762＜t＜15.88 Precipitation Hardening, 496°C ≥1170 ≥1070 ≥8 ≥25 HRC 38~47
15.9＜t＜102 Precipitation Hardening, 496°C ≥1170 ≥1070 ≥10 ≥30 HRC 38~47
t<4.762 Precipitation Hardening, 552°C ≥1070 ≥1000 ≥5 HRC 35~43
4.762＜t＜15.88 Precipitation Hardening, 552°C ≥1070 ≥1000 ≥8 ≥30 HRC 33~42
15.9＜t＜102 Precipitation Hardening, 552°C ≥1070 ≥1000 ≥12 ≥35 HRC 33~42
t<4.762 Precipitation Hardening, 579°C ≥1000 ≥860 ≥5 HRC 31~40
4.762＜t＜15.88 Precipitation Hardening, 579°C ≥1000 ≥860 ≥9 ≥30 HRC 29~38
15.9＜t＜102 Precipitation Hardening, 579°C ≥1000 ≥860 ≥13 ≥35 HRC 29~38
t<4.762 Precipitation Hardening, 593°C ≥965 ≥790 ≥5 HRC 31~40
4.762＜t＜15.88 Precipitation Hardening, 593°C ≥965 ≥790 ≥10 ≥30 HRC 29~38
15.9＜t＜102 Precipitation Hardening, 593°C ≥965 ≥790 ≥14 ≥35 HRC 29~38
t<4.762 Precipitation Hardening, 621℃ ≥930 ≥725 ≥8 HRC 28~38
4.762＜t＜15.88 Precipitation Hardening, 621℃ ≥930 ≥725 ≥10 ≥35 HRC 26~36
15.9＜t＜102 Precipitation Hardening, 621℃ ≥930 ≥725 ≥16 ≥40 HRC 26~36
t<4.762 Precipitation Hardening, 760°C + 621°C ≥790 ≥515 ≥9 HRC 26~36
4.762＜t＜15.88 Precipitation Hardening, 760°C + 621°C ≥790 ≥515 ≥11 ≥40 HRC 24~34
15.9＜t＜102 Precipitation Hardening, 760°C + 621°C ≥790 ≥515 ≥18 ≥45 HRC 24~34
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

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