GB 3077 45MnB steel

Material: 45MnB
Standard: alloy structural steel

GB 3077 45MnB grade steel is a kind of alloy structural steel. This steel has higher hardness, strength, wear resistance and hardenability than 45# steel. The critical hardenable diameter in water is 17~30mm, and the critical hardenable diameter in oil is 7~15mm.

GB 3077 45MnB Chemical Composition

Grade	Chemical Composition
45MnB	The Element (%)
	C	Si	Mn	Cr	Mo	Ni	W	B	Al	Ti	V
	0.42-0.49	0.17-0.37	1.10-1.40	-	-	-	-	0.0005-0.0035	-	-	-

GB 3077 45MnB Mechanical Property

Grade	Mechanical Property
45MnB	Yield Strength Mpa	Tensile Strength Mpa	Elongation %	Impact energy J
	1030	835	9	39

GB 3077 45MnB steel application

GB 3077 45MnB steel is usually used in quenched and tempered condition to make parts that are slightly larger and more expensive than 45 steel; such as the crank handle of tractors and other similar parts. In addition, 40cr steel can be replaced when manufacturing small-sized, less demanding parts.