5Х3В3МФС ДИ23 - GOST 5950-2000

Grade	5Х3В3МФС
Old Grade
Corresponding Standard	GOST 5950-2000 Tool Alloy Steel Bars, Strips and Coils. General Specifications
Classification	Tool Steel

5Х3В3МФС Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	W	V	Nb
Minimum Value	0.45	0.5	0.2	-	-	2.5	-	-	0.8	3	1.5	0.05
Maximum Value	0.52	0.8	0.5	0.03	0.03	3.2	0.4	0.3	1.1	3.6	1.8	0.15

① It is allowed to replace tungsten partially with molybdenum in tungsten steels: one fraction of the total mass of tungsten is equivalent to one fraction of the total mass of molybdenum.
The quantity of the replaced tungsten shall be no more than 0.1 % in steels with the fraction of the total mass of tungsten not exceeding 1.5 %. It shall be no more than 0.2 % in steels with the fraction of the total mass of tungsten not exceeding 2 %.
The sum fraction of the total mass of tungsten and molybdenum shall not exceed the specified fraction of the total mass of tungsten.
② It is allowed to replace molybdenum partially with tungsten in molybdenum steels: one fraction of the total mass of molybdenum is equivalent to two fractions of the total mass of tungsten.
The quantity of the replaced molybdenum shall be no more than 0.1 % in steels with the fraction of the total mass of molybdenum not exceeding 1.2 % inclusive. It shall be no more than 0.2 % in steels with the fraction of the total mass of milybdenum exceeding 1.2 %.
The sum fraction of the total mass of tungsten, counted to molybdenum, and molybdenum itself shall not exceed the specified fraction of the total mass of molybdenum.

5Х3В3МФС Mechanical Properties

product	Heat Treatment or Condition	Hardness HBW
Steel	Delivery Condition + Cold Processing	Indentation Diameter ≥ 3.9mm ≤241
Steel	Quenching 1120~1140°C oil cooling, Tempering 550±10°C	HRC≥49

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