Grade
23MnB4
European Standard Steel Grade
1.5535
Corresponding Standard
EN 10263-4-2017
Classification
Alloy Steel
23MnB4 Chemical Element Composition Content (%)
Component
C
Si ⓔ
Mn
P
S
Cr ⓕ
Cu
B
Minimum Value
0.2
-
0.9
-
-
-
-
0.0008
Maximum Value
0.25
0.3
1.2
0.025
0.025
0.3
0.25
0.005
23MnB4 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)
≤600
≥60
Bar, rod, wire; 5<d≤25
Spheroidizing or Spheroidizing and Peeling (+AC or +AC+PE)
≤520
≥64
Wire; 5<d≤10
Untreated and Cold Drawn (+U+C)
≤700
≥55
Wires; 10<d≤25
Untreated and Cold Drawn (+U+C)
≤690
≥55
Wire; 2<d≤5
Unheated, Cold Drawn, and Spheroidized (+U+C+AC)
≤510
≥66
Wire Rods; 5<d≤25
Unheated, Cold Drawn, and Spheroidized (+U+C+AC)
≤500
≥66
Wire; 2<d≤5
Unheated, Cold Drawn, Spheroidized, and Quenched Rolling (+U+C+AC+LC)
≤550
≥64
Wire Rods; 5<d≤25
Unheated, Cold Drawn, Spheroidized, and Quenched Rolling (+U+C+AC+LC)
≤540
≥64
Wire; 5<d≤10
Spheroidizing + Cold Drawn (+AC+C)
≤620
≥59
Wires; 10<d≤25
Spheroidizing + Cold Drawn (+AC+C)
≤610
≥59
1 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
International Organization for Standardization
European Standard
ISO
EN
Numerical Grade
23 MnB4
23 MnB4
1.5535
3 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
4 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China
Japan
United States
International Organization for Standardization
European Standard
GB
JIS
ASTM
ISO
EN
ML25MnB GB/T 28906-2025 GB/T 6478-2015
SWRCHB526 JIS G3058-1-2021
15B25 ASTM A29/A29M-23
23MnB4 ISO 4954-2022
23MnB4 EN 10263-4-2017
23MnB4 Corresponding Standards(Same grade name, different standards)
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