BM4 - BS 4659-1989

Grade	BM4
Corresponding Standard	BS 4659-1989 Specification for Tool and Die Steels
Classification	Tool Steel

BM4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	W	V	Co ^①	Sn
Minimum Value	1.25	-	-	-	-	3.75	-	-	4.25	5.75	3.75	-	-
Maximum Value	1.4	0.4	0.4	0.035	0.035	4.5	0.4	0.2	5	6.5	4.25	1	0.05

BM4 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
Steel	Annealing	≤255
Steel	Quenching + Tempering	HV ≥849

Approximate Comparison Table High-Speed Tool Steels

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