23MnB4 - ISO 4954-1-2024

Grade	23MnB4
Corresponding Standard	ISO 4954-1-2024 Steels for Cold Heading and Cold Extruding - Technical Delivery Conditions - Part1: Non-Alloy and Alloy Steels
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

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Reduction of Area ψ %
5＜d≤25	+AR or +PE	≤600	≥60
5＜d≤25	+AC or +AC+PE	≤520	≥64
5＜d≤10	+AR+C	≤700	≥55
10＜d≤25		≤690	≥55
2≤d≤5	+AR+C+AC	≤510	≥66
5＜d≤25		≤500	≥66
2≤d≤5	+AR+C+AC+LC	≤550	≥64
5＜d≤25		≤540	≥64
5＜d≤10	+AC+C	≤620	≥59
10＜d≤25		≤610	≥59

①+AR=as hot-rolled；+AR or +PE=as hot-rolled or peeled；+AR+C=as hot-rolled+cold drawn；+AR+C+AC=as hot-rolled+cold drawn+spheroidized；+AR+C+AC+LC=as hot-rolled+cold drawn+spheroidized+skin passed；+AC= spheroidized ；+AC or +AC+PE=spheroidized or spheroidized+peeled；+AC+C=spheroidized +cold drawn；+FP=treated to ferrite-pearlite structure and hardness range；+AC+C+AC=spheroidized +cold drawn + spheroidized；+AC+C+AC+LC=spheroidized +cold drawn + spheroidized + skin passed

1 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

2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China		Japan	United States	International Organization for Standardization	European Standard
YB	GB	JIS	ASTM	ISO	EN
QML25MnB	ML25MnB	SWRCHB526	15B25	23MnB4	23MnB4

3 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)

1	EN 10263-4-2001
	23MnB4 1.5535
2	EN 10269-2013
	23MnB4 1.5535
3	DIN EN 10263-4-2018
	23MnB4 1.5535
4	EN 10263-4-2017
	23MnB4 1.5535
5	DIN EN 10269-2014
	23MnB4 1.5535
6	ISO 4954-2018
	23MnB4
7	ISO 4954-1-2024
	23MnB4

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