Grade 20CrH
China ISC A20205
Corresponding Standard GB /T 5216-2004
Structural Steels Subject to End-Quench Hardenability Requirments
Classification Alloy Steel
Properties Quench Hardness
20CrH Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.17 0.17 0.5 - - 0.7 - -
Maximum Value 0.23 0.37 0.85 0.035 0.035 1.1 0.3 0.3
① The grade of high quality steel means that it is A after the grade, such as 40CrAH.
② The final number of the unified numeric code of high quality steel is 7, and the rest of the capitalized Latin letters are the same as the first four Arabic numerals, such as the unified numeric code of 40CrAH is A20407.
③ Quality carbon structural steel: P≤ 0.035%,S≤0.035%,Cu≤0.25%,Cr≤0.25%,Ni≤0.30%
High-quality carbon structural steel: P≤ 0.030%,S≤0.030%,Cu≤0.25%,Cr≤0.25%,Ni≤0.30%
Quality alloy structural steel: P≤ 0.035%,S≤0.035%,Cu≤0.30%,Cr≤0.30%,Ni≤0.30%
High-quality alloy structural steel: P≤ 0.025%,S≤0.025%,Cu≤0.25%,Cr≤0.30%,Ni≤0.30%
④ According to the requirements of the demander, the sulfur content (mass fraction) in the steel can also be in the range of 0.02% to 0.035%. At this time, the sulfur content (mass fraction) allows a deviation of ±0.005%, and S is added before H in the brand name, such as 16CrMnSH.
20CrH Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Annealing or High-Temperature Tempering ≤179
1 Approximate Comparison Table Structural Alloy 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/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
20Cr
20CrH
A20202 SCr420 SCr420
SCr420H
SCR420HRCH
SCr420 5120 G51200 20Cr4 20Cr4 1.7027 18C3 20Cr4 1.7027 20Х 527A20
2 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrH A20205 ≈SCr420H ≈SCr420H 5120H H51200 ≈20Cr4H 20Cr4 1.7027 (20MC5) 20Х (527H17)
20CrH Corresponding Standards(Same grade name, different standards)

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