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Grade 20Cr4
Corresponding Standard DIN EN ISO 683-3-2019
Heat-treatable steels,alloy steels and free-cutting steels--Part 3: Case-hardening steels
Classification Alloy Steel
20Cr4 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Cu
Minimum Value 0.17 0.15 0.6 - - 0.9 -
Maximum Value 0.23 0.4 0.9 0.025 0.035 1.2 0.4
20Cr4 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
All product shapes Soft Annealing (+A) ≤197
Bar, wire, flat steel, forging Processed to a certain hardness (+TH) 149~197
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
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)
3 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. GOST
20Cr1H A20215 SCr420H SCr420H SCr420H ≈5120H ≈H51200 20Cr4H ≈20Cr4 ≈1.7027 20Х
20Cr4 Corresponding Standards(Same grade name, different standards)
1 DIN 17210-1986
20Cr4 1.7027
2 ISO 683-18-1996
20Cr4
3 ISO 683-11-1987
20Cr4 20Cr4H (4) 20Cr4HH 20Cr4HL
4 ISO 683-17-2014
20Cr 4
5 ASTM A534-2014
20Cr4 B21
6 DIN EN ISO 683-3-2019
20Cr4
7 ISO 683-3-2019
20Cr4
8 DIN EN ISO 683-17-2015
20Cr4 1.7027
9 ISO 683-11-2012
20Cr4
10 ISO 683-18-2014
20Cr4
11 EN 10277-2018
20Cr4 1.7027
12 ISO 4954-2018
20Cr4
13 ISO 4954-1-2024
20Cr4

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