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Grade A1028 Grade A Class 1
USA UNS S41000
Corresponding Standard ASTM A 1028-2003(R2015)
Standard Specification for Stainless Steel Bars for Compressor and Turbine Airfoils
Classification Martensitic Stainless Steel
A1028 Grade A Class 1 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo
Minimum Value - - - - - 11.5 - -
Maximum Value 0.15 0.5 1 0.018 0.015 13 0.75 0.5
A1028 Grade A Class 1 Mechanical Properties
Tensile Strength
σb
ksi 		Specified Plastic Yield Strength
Rp0.2
ksi 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
≥100 ≥70 ≥20 ≥60 HB: ≤255 ft-lb
≥30
1 Approximate Comparison Table Martensitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
12Cr13
(1Cr13) 		S41010 410 SUS 410 STS 410 410 S41000 X12Cr 13 4006-410-00-I X10Cr 13
X12Cr 13 		1.4006
1.4006 		Z12C 13
Z10C13 		X12Cr 13 1.4006 12Х13
12KH13
15KH13L 		2302 410S21
2 Approximate Comparison Table Martensitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
12Cr13
(1Cr13) 		S41010 410 SUS 410 STS 410 410 S41000 X12Cr 13
3
(ISO 683-13-1986) 		X10Cr 13 1.4006 Z12C 13 X12Cr 13 1.4006 12Х13 2302 410S21
3 Approximate Comparison Table Stainless Steels for Cold Heading and Cold Extruding
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM/AISI UNS ISO Numerical Grade EN Numerical Grade
12Cr13
(1Cr13) 		S41010 SUS410 410 S41000 X12Cr13 4006-410-00-I X12Cr13 1.4006

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