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Grade 18CrMo4
European Standard Steel Grade 1.7243
Corresponding Standard EN 10263-3-2017
Steel rod, bars and wire for cold heading and cold extrusion Part 3: Technical delivery conditions for steels for case hardening steels
Classification Alloy Steel
18CrMo4 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Cu Mo
Minimum Value 0.15 - 0.6 - - 0.9 - 0.15
Maximum Value 0.21 0.3 0.9 0.025 0.025 1.2 0.25 0.25
18CrMo4 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Reduction of Area
ψ
% 		Hardness
HBW
Bars; 5<d≤40 Processed to Ferrite-Pearlite Structure and Hardness Range (+FP) 140~187
Bars; 5<d≤40 Spheroidizing (+AC) ≤550 ≥60
Bar, wire; 2<d≤5 Untreated, Cold Drawn, Spheroidizing Treatment (+U+C+AC) ≤550 ≥62
Bar, wire; 5<d≤40 Untreated, Cold Drawn, Spheroidizing Treatment (+U+C+AC) ≤530 ≥62
Bar, wire; 2<d≤5 Untreated, Cold Drawn, Spheroidizing Treatment, and Tempered Rolling (+U+C+AC+LC) ≤590 ≥60
Bar, wire; 5<d≤40 Untreated, Cold Drawn, Spheroidizing Treatment, and Tempered Rolling (+U+C+AC+LC) ≤570 ≥60
Bars, wire; 5<d≤10 Spheroidizing Treatment and Cold Drawing (+AC+C) ≤660 ≥57
Bars, wire; 10<d≤40 Spheroidizing Treatment and Cold Drawing (+AC+C) ≤650 ≥57
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
20CrMo
20CrMoH 		A30202 SCM420 SCM420
SCM418
SCM418H 		SCM420 4118
4120 		G41180 18CrMo4 20CrMo5 1.7264 18CD4 18CrMo4 1.7243 20ХМ CDS12
2 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrMnH A30205 SCM420H SCM420H SCM420H 4118H H41180 18CrMo4H 18CrMo4 1.7243 18CrMo4
(20CD4) 		20ХМ 18CrMo4
3 Approximate Comparison Table Structural Alloy Steel
Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
SCM418 18CrMo4 18CrMo4 18CD4
18CrMo4 		18CrMo4 1.7243 20KHM 708H20
708M20
4 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
International Organization for Standardization European Standard
ISO EN Numerical Grade
18CrMo4 18CrMo4 1.7243
5 Approximate Comparison Table Structural Alloy Steel
China France
GB NF EN/NF
20CrMo 18CrMo4
18CrMo4 Corresponding Standards(Same grade name, different standards)
1 EN 10084-1998
18CrMo4 1.7243
2 ISO 683-11-1987
18CrMo4 18CrMo4H 7 18CrMo4HH 18CrMo4HL
3 EN 10263-3-2001
18CrMo4 1.7243
4 EN 10250-3-1999
18CrMo4 1.7243
5 DIN EN 10263-3-2018
18CrMo4 1.7243
6 EN 10263-3-2017
18CrMo4 1.7243
7 DIN EN ISO 683-3-2019
18CrMo4
8 ISO 683-3-2019
18CrMo4
9 DIN EN 10084-2008
18CrMo4 1.7243
10 ISO 683-11-2012
18CrMo4
11 ISO 4954-2018
18CrMo4
12 UNI 8550-1984
18CrMo4
13 NF EN 10084-2008
18CrMo4 1.7243 (18CD4)
14 ISO 4954-1-2024
18CrMo4

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