What is EN47 used for?

Springs and parts that must flex repeatedly without breaking: leaf and coil springs, torsion bars, and highly stressed shafts and tools.

What hardness should EN47 springs be?

Usually about 42–50 HRC, chosen by the spring designer; harder springs are stronger but less tough.

EN47 (50CrV4) spring steel: properties and uses

EN47 is a chromium-vanadium alloy spring steel, equivalent to 50CrV4. Hardened and tempered, it combines high strength with good toughness and fatigue resistance, so it is used for heavy springs, torsion bars and highly stressed shafts and tools.

Quick facts

Type: Chromium-vanadium alloy spring steel
Main alloys: Chromium and a little vanadium
Hardened and tempered: About 42–50 HRC for springs
Hardening: Oil quench from about 830–870 °C
Tempering: About 400–500 °C for spring use
Strengths: Fatigue resistance and toughness

Equivalent grades

Standard	Grade
BS 970	735A51 (EN47)
EN / DIN	51CrV4 (formerly 50CrV4), 1.8159
SAE / AISI	6150

Equivalents are close, not identical. Name the grade and standard on the drawing.

Typical chemical composition

Element	%
Carbon (C)	About 0.45–0.55
Manganese (Mn)	About 0.70–1.10
Chromium (Cr)	About 0.90–1.20
Vanadium (V)	About 0.10–0.25

Values are typical. The exact limits depend on the standard and supplier; ask for the mill test certificate when it matters.

Typical uses

Leaf and coil springs for vehicles
Torsion bars and stabiliser bars
Heavily loaded shafts and gears
Hand tools: spanners and chisels
Disc springs and spring clips

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Questions

What is EN47 used for?: Springs and parts that must flex repeatedly without breaking: leaf and coil springs, torsion bars, and highly stressed shafts and tools.
What hardness should EN47 springs be?: Usually about 42–50 HRC, chosen by the spring designer; harder springs are stronger but less tough.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 9 October 2026.