51CrV4 EN 10089-2002 Steel wire for tempering springs

Material designation	51CrV4
European standard steel	1.8159
Correspondence standard	EN 10089-2002 Hot rolled steels for quenched and tempered springs; technical delivery conditions
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 (%)

51CrV4 Mechanical properties

Heat treatment or condition	Tensile strength σb Mpa	Yield point σs Mpa	Elongation or elongation after breaking δ %	Reduction of area ψ %	Hardness HBW	Shock absorption energy KV2 J
+QT	1350~1650	≥1200	≥6	≥30	-	≥8
+S	-	-	-	-	≤280	-
+A	-	-	-	-	≤248	-
+AC	-	-	-	-	≤230	-

+QT= quenching and tempering; +S= cold shear treatment; +A= softening annealing; +AC= spheroidizing annealing

Quenching temperature 850°C±10°C, oil cooling, tempering temperature 450°C±10°C;

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