Grade
20MnB4
European Standard Steel Grade
1.5525
Corresponding Standard
EN 10263-4-2017
Classification
Alloy Steel
20MnB4 Chemical Element Composition Content (%)
Component
C
Si ⓔ
Mn
P
S
Cr ⓕ
Cu
B
Minimum Value
0.18
-
0.9
-
-
-
-
0.0008
Maximum Value
0.23
0.3
1.2
0.025
0.025
0.3
0.25
0.005
20MnB4 Mechanical Properties
condition
Heat Treatment or Condition
Tensile Strengthb Mpa
Reduction of Area%
Bar, rod, wire; 5<d≤25
Untreated or Pickling (+U or +PE)
≤580
≥60
Bar, rod, wire; 5<d≤25
Spheroidizing or Spheroidizing and Peeling (+AC or +AC+PE)
≤500
≥66
Wire; 5<d≤10
Untreated and Cold Drawn (+U+C)
≤680
≥55
Wires; 10<d≤25
Untreated and Cold Drawn (+U+C)
≤670
≥55
Wire; 2<d≤5
Unheated, Cold Drawn, and Spheroidized (+U+C+AC)
≤490
≥68
Wire Rods; 5<d≤25
Unheated, Cold Drawn, and Spheroidized (+U+C+AC)
≤480
≥68
Wire; 2<d≤5
Unheated, Cold Drawn, Spheroidized, and Quenched Rolling (+U+C+AC+LC)
≤530
≥66
Wire Rods; 5<d≤25
Unheated, Cold Drawn, Spheroidized, and Quenched Rolling (+U+C+AC+LC)
≤520
≥66
Wire; 5<d≤10
Spheroidizing + Cold Drawn (+AC+C)
≤600
≥61
Wires; 10<d≤25
Spheroidizing + Cold Drawn (+AC+C)
≤590
≥61
1 Approximate Comparison Table Structural Alloy Steel
2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China
Japan
United States
International Organization for Standardization
European Standard
GB
ISC
JIS
ASTM/AISI
ISO
EN
ML20MnB GB/T 6478-2015 GB/T 6478-2001
A71204
SWRCHB 320 JIS G3508.1-2010
10B22 ASTM A29/A29M-12 ASTM A510/A510M-13
CE20BG2 ISO 4954-1993
20MnB4 EN 10263-4-2001
3 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
International Organization for Standardization
European Standard
ISO
EN
Numerical Grade
20 MnB4
20 MnB4
1.5525
20MnB4 Corresponding Standards(Same grade name, different standards)
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