45B A70452 - GB /T 11251-2020

Grade	45B
China ISC	A70452
Corresponding Standard	GB /T 11251-2020 Alloy Structural Steel Plate and Strip
Classification	Alloy Steel
Properties	Strength Hardness Quench Hardness

45B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	B
Minimum Value	0.42	0.17	0.6	-	-	-	-	-	-	0.0008
Maximum Value	0.49	0.37	0.9	0.03	0.03	0.3	0.3	0.3	0.1	0.0035

• The composition shall comply with the provisions of GB/T 3077-2015

45B Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %
Annealing	550~750	≥18

• The surface Brinell hardness of steel plates delivered in a high-temperature tempered state shall comply with the provisions of GB/T 3077-2015

Approximate Comparison Table Structural Alloy Steel

45B Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!