Grade 80Cr20Si2Ni
Other Names
Corresponding Standard GB /T 12773-2021
Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification Martensitic Stainless Steel
80Cr20Si2Ni Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.75 1.75 - - - 19 1.15 -
Maximum Value 0.9 2.6 0.8 0.03 0.03 20.5 1.7 0.3
80Cr20Si2Ni Mechanical Properties
condition Test Temperature Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Hardness
HBW
Sample d=25 Room Temperature 1030~1080°C Oil quenching + 700~800°C Air cooling ≥880 Rp0.2: ≥680 ≥10 ≥15 ≥295
Bar or Coil Room Temperature Annealed ≤321
sample Quenching + Tempering High Temperature Short-Term Tensile Strength 550 High-temperature short-term yield strength 500
sample Quenching + Tempering High temperature short-term tensile strength 400 High-temperature short-term yield strength 370
sample Quenching + Tempering High temperature short-term tensile strength 300 High temperature short-term yield strength 280
sample Quenching + Tempering High temperature short-term tensile strength 230 High temperature short-term yield strength 170
sample Quenching + Tempering High temperature short-term tensile strength 180 High temperature short-term yield strength 120
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

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