51CrV4 DIN EN 10132-4-2000(+AC:2002) Cold rolled steel

Material designation	51CrV4
German W-Nr.	1.8159
Correspondence standard	DIN EN 10132-4-2000(+AC:2002) Cold-rolled narrow steel strip for heat treatment-Technical delivery conditions Part 4: Spring steels and other applications (includes Corrigendum AC:2002)
Classify	Spring steels
Performance	Strength elasticity Fatigue resistance hardenability
Explain	① 51CrV4(1.8159) spring steel has good mechanical properties and process properties, high hardenability, adding vanadium to the steel grain refinement, reduce overheating sensitivity, improve strength and toughness, with high fatigue strength, yield ratio is also high, but poor weldability, cold deformation plasticity is low. 51CrV4 is a higher grade spring steel, used as a large section of high load important springs and operating temperature <300 ℃ valve springs, piston springs, safety valve springs. Standard parts such as coil slotted cylindrical pins can also be manufactured. This grade is one of the materials used in the manufacture of DIN EN ISO 8750-2007 rolled elastic cylindrical pins - standard load (specification 12 and above)

51CrV4 Chemical Element Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V
Minimum value	0.47	-	0.7	-	-	0.9	-	-	0.1
Maximum value	0.55	0.4	1.1	0.025	0.025	1.2	0.4	0.1	0.25

51CrV4 Mechanical properties

Thickness t mm	Heat treatment or condition	Tensile strength σb Mpa	Yield point σs Mpa	Elongation or elongation after breaking δ %	Hardness HBW
0.3≤t≤3	Annealed (+A) or Annealed flat (+LC)	≤700	≤550	≥13	HV ≤220
0.3≤t≤3	Tempering (+QT)	1200~1800			370~550

① Customers can specify hardness or tensile strength values, but not both. If neither is specified, the tensile strength value should apply.

②For thicker strips, their mechanical properties should be agreed upon at the time of ordering or inquiry.

③ For cold-rolled delivery of materials, the strength range of 150MPa or hardness range of 50HV should be applicable, such as :850 MPa~1000 MPa or such as 240 HV~290 HV.

④For materials supplied under quenching and tempering conditions, a range of 150 MPa or 50 HV shall be applicable, such as 1350 MPa to 1500 MPa or 450 HV to 500 HV.

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