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Home Material GB /T 1221-2007
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Grade 07Cr17Ni7Al
China ISC S51770
Old Grade
Corresponding Standard GB /T 1221-2007
Heat-resistant Steel Bars
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
07Cr17Ni7Al Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Al
Minimum Value - - - - - 16 6.5 0.75
Maximum Value 0.09 1 1 0.04 0.03 18 7.75 1.5
07Cr17Ni7Al Mechanical Properties
diameter
d
mm		 Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
d≤75 (precipitation hardening 510°C aging) ≥1230 ≥1030 ≥4 ≥388
d≤75 (precipitation hardening 565°C aging) ≥1140 ≥960 ≥5 ≥363
d≤75 (solution treatment) ≤1030 ≤380 ≥20 ≤229
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
07Cr17Ni7Al
(0Cr17Ni7Al) 		S51770 631 SUS 631 STS 631 631 S17700 X7CrNiAl 17-7
2
(ISO 683-13-1986) 		X7CrNiAl 17-7 1.4568 Z8CNA 17-07 X7CrNiAl 17-7 1.4568 09Х17Н7Ю
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
07Cr17Ni7Al
(0Cr17Ni7Al) 		S51770 631 SUS 631 STS 631 631 S17700 X7CrNiAl 17-7 X7CrNiAl 17-7 1.4568 Z8CNA 17-07 X7CrNiAl 17-7 1.4568 09Х17Н7Ю
07Cr17Ni7Al Corresponding Standards(Same grade name, different standards)
1 GB /T 20878-2007
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
2 GB /T 1221-2007
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
3 GB /T 1220-2007
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
4 GB /T 4356-2016
07Cr17Ni7Al S51770
5 GB /T 4239-1991
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
6 GB /T 3280-2015
07Cr17Ni7Al S51770
7 GB /T 4238-2015
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
8 GB /T 4237-2015
07Cr17Ni7Al S51770
9 GB /T 24588-2019
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
10 GJB 8268-2014
07Cr17Ni7Al S51770 (0Cr17Ni7Al)
11 GB /T 20878-2024
07Cr17Ni7Al S51770 (0Cr17Ni7Al)

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