51CrV4 EN 10132-4-2002 spring steel wire

Material designation	51CrV4
European standard steel	1.8159
Correspondence standard	EN 10132-4-2002 Cold rolled steel strips for heat treatment. Technical delivery conditions - Spring steel and other application steels
Classify	Spring steels
Performance	Strength elasticity Fatigue resistance hardenability
Label	Structural alloy steel
Explain	51CrV4(1.8159) spring steel has good mechanical properties and process properties, high hardenability, adding vanadium to make 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. 51CrV4 corresponds to the German brand 50CrV4 (1.8159) and the French brand 51CrV4.

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	0.55	0.4	1.1	0.025	0.025	1.2	0.4	0.1	0.25

51CrV4 Mechanical properties:

Thickness

Strength of extension

σb

Mpa

Yield point

σs

Mpa

Elongation or elongation after breaking

Rigidity

HBW

0.3≤t≤3

Annealed or annealed flat ≤700

Annealed or annealed flat ≤550

Annealed or annealed flat ≥13

Annealed or annealed flat HV≤220

0.3≤t≤3

Tempering

1200 ~ 1800

Tempered HV

370 ~ 550

①Customers 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.

③For materials delivered in cold rolled condition, the strength range of 150MPa or the hardness range of 50HV shall apply, for example :850 ~1000 MPa or 240 HV~290 HV.

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

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