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Grade SUH4
Corresponding Standard JIS G 4311-2019
Heat-resisting steel bars and wire rods
Classification Martensitic Stainless Steel
Properties Corrosion Resistance
SUH4 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.75 1.75 0.2 - - 19 1.15 -
Maximum Value 0.85 2.25 0.6 0.03 0.03 20.5 1.65 0.3
SUH4 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 		Impact Energy Absorption
KV2
J
Rod Annealing ≤321
Bar; d≤75mm Quenching + Tempering ≥880 ≥685 ≥15 ≥35 ≥262 ≥10
1 Approximate Comparison Table Martensitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States Germany France United Kingdom
GB ISC CNS JIS KS UNS SAE DIN EN/DIN W-Nr. NF EN/NF BS EN/BS
80Cr20Si2Ni
(8Cr20Si2Ni) 		S48380 SUH 4 SUH 4 STR 4 S65006 HNV6 X80CrNiSi 20 1.4747 Z80CSN 20-02 443S65
2 Approximate Comparison Table Valve Steel
China Taiwan, China Japan South Korea United States Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS Commercial Grade UNS SAE DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
80Cr20Si2Ni
(8Cr20Si2Ni) 		S48380 4 SUH 4 STR 4 Sil XB S65006 HNV6 X80CrSiNi 20 1.4747 Z80CNS 20-02 X80CrSiNi 20 1.4747 80Х20Н2С2 443S65
3 Approximate Comparison Table Martensitic Stainless Steel
China Japan International Organization for Standardization European Standard
ISC JIS ISO Numerical Grade Numerical Grade
S48380 SUH4 X80CrSiNi20-2 4766-440-77-X (1.4766)
SUH4 Corresponding Standards(Same grade name, different standards)
1 JIS G 4311-1991
SUH4
2 JIS G 4311-2019
SUH4

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