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Grade 420S37
Old Grade
Corresponding Standard BS 970-4-1970
Specification for Wrought steels in the form of blooms,billets,bars and forgings--Part 4:Valve steels
Classification Martensitic Stainless Steel
420S37 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu ◎ Mo ◎
Minimum Value 0.2 - - - - 12 - - -
Maximum Value 0.28 0.8 1 0.04 0.03 14 1 0.3 0.3
420S37 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
Steel, section≤152.4mm Hardened + tempered (R) 696~853 ≥490 ≥529 ≥15 201~255 Section ≤63.5mm
Izod: ≥25ft·lbf
Section＞63.5~≤152.4mm
Izod: ≥20ft·lbf
Steell, section≤152.4mm Hardened + tempered (S) 774~921 ≥559 ≥588 ≥13 223~277 Section ≤28.6mm
Izod: ≥20ft·lbf
Section＞63.5~≤152.4mm
Izod: ≥10ft·lbf
• The letters P, R, S and T in the table indicate the range of tensile strength of quenched and tempered steels.
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
20Cr13
(2Cr13) 		S42020 420J1 SUS 420J1 STS 420J1 420 S42000 X20Cr 13
4
(ISO 683-13-1986) 		4021-420-00-I X20Cr 13 1.4021 Z20C 13 X20Cr 13 1.4021 20Х13 2303 420S37
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 United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
20Cr13
(2Cr13) 		S42020 420J1 SUS 420J1 STS 420J1 420 S42000 X20Cr 13 X20Cr 13 1.4021 420F 20
Z20C 13 		X20Cr 13 1.4021 20Х13 420S37
3 Approximate Comparison Table Martensitic Heat-Resistant Steel
China Japan United States Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM UNS DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
20Cr13
2Cr13
X20Cr13 		SUS420J1 420 S42010
S42010 		X20Cr13 X20Cr13
Z20C13 		X20Cr13 1.4021 20KH13 2303 420S29
420S37
420S37 Corresponding Standards(Same grade name, different standards)
1 BS 970-3-1991
420S37
2 BS 970-1-1983
420S37
3 BS 970-4-1970
420S37 (EN56C)

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