20MnB5 1.5530 - EN 10083-3-2006

Grade	20MnB5
European Standard Steel Grade	1.5530
Corresponding Standard	EN 10083-3-2006
Classification	Alloy Steel

20MnB5 Chemical Element Composition Content (%)

	Component	C	Si	Mn	P	S	B
本标准	Minimum Value	0.17	-	1.1	-	-	0.0008
本标准	Maximum Value	0.23	0.4	1.4	0.035	0.04	0.005

	Component	C	Si	Mn	P	S	Ni	B
宝钢(热轧钢板)	Minimum Value	0.17	-	1.1	-	-	-	0.0008
宝钢(热轧钢板)	Maximum Value	0.23	0.4	1.4	0.015	0.025	0.2	0.005

• Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat and for boron to have its effect on the hardenability. All reasonable precautions shall be taken to prevent the addition of such elements from scrap or other material used in the manufacture which affect the hardenability, mechanical properties and applicability.

20MnB5 Mechanical Properties

product form	Heat Treatment or Condition	Hardness HBW
Hot-rolled steel plate (Baosteel)	Hot Rolling	HV ≤270
Hot-rolled steel plate (Baosteel)	Annealing	HV ≤170
Hot-rolled steel plate (Baosteel)	Water Quenching 820~900°C	HRC ≥45
Hot-rolled steel plate (Baosteel)	Oil Quenching 830~890℃	HRC ≥43

• Re: Upper yield strength or, if no yield phenomenon occurs, 0,2 % proof strength R p0,2 .
• initial gauge length L0 = 5.65√S0
• +QT=quenched and tempered ；+A=Annealed；+S=Treated to improve shearability
• Condition +A is not applicable for boron steels.

1 Approximate Comparison Table

Japan	International Organization for Standardization	European Standard
JIS	ISO	EN	Numerical Grade
SWRCHB620	20MnB5 23MnB5 26MnB5 34MnB5	20MnB5 23MnB5 26MnB5 34MnB5	1.5530

2 Approximate Comparison Table structural alloy steel

Germany	France	European Standard		United Kingdom
DIN EN/DIN	NF EN/NF	EN	Numerical Grade	BS EN/BS
19MnB4	20MB5	20MnB5	1.5530	170H20

3 Approximate Comparison Table structural alloy steel

China	European Standard
GB	EN
25MnB	20MnB5

4 Approximate Comparison Table

Japan	International Organization for Standardization	European Standard
JIS	ISO	EN
SWRCHB620	20MnB5	20MnB5

20MnB5 Corresponding Standards(Same grade name, different standards)

1	EN 10083-3-2006
	20MnB5 1.5530
2	ISO 683-2-2016
	20MnB5
3	EN ISO 683-2-2018
	20MnB5
4	ISO 4954-2018
	20MnB5
5	EN 10132-2021
	20MnB5 1.5530
6	NF EN 10083-3-2006
	20MnB5 1.5530 (20MB5)
7	ISO 4954-1-2024
	20MnB5

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