50CrV4 alloy steel

Introduction

we manufacture forging ingots, billets, and blooms in alloy steel specifically for 50CrV4, tailored for high-performance applications. 50CrV4 is a medium to high carbon, chromium–vanadium alloy steel renowned for its excellent strength, high fatigue resistance, and superior wear performance. The addition of vanadium refines the grain structure and enhances toughness, while chromium improves hardenability and wear resistance. This grade is specifically designed for applications subjected to repeated loading, shock, and high stress conditions.

50CrV4 is widely used in automotive, spring manufacturing, and heavy engineering applications where reliability, long service life, and consistent mechanical performance are critical.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.47 – 0.55	Provides high strength and hardness
Manganese (mn)	0.70 – 1.10	Improves hardenability and toughness
Sulphur (s)	Max 0.030	Controlled to maintain fatigue life
Phosphorus (p)	Max 0.035	Impurity; low content improves toughness
Silicon (si)	Max 0.40	Enhances elasticity and strength
Chromium (cr)	0.90 – 1.20	Increases hardness, wear resistance, and hardenability
Nickel (ni)	Nil	Not present
Molybdenum (mo)	Nil	Not present
Vanadium (v)	0.10 – 0.20	Grain refinement and improved fatigue strength

Mechanical properties (typical values after quenching & tempering)

• tensile strength: high
• yield strength: high
• hardness: 44 – 52 hrc (application dependent)
• fatigue resistance: excellent
• impact toughness: good
• wear resistance: very good

Heat treatment

• annealing: for improved machinability before forming
• hardening: heating to approx. 830 – 870°c followed by oil quenching
• tempering: to achieve optimum balance of strength, toughness, and fatigue resistance

Proper heat treatment is essential to achieve optimum spring performance and long service life.

Key features and benefits

• excellent fatigue and wear resistance
• high strength with good toughness
• grain refinement due to vanadium addition
• maintains performance under cyclic and shock loading
• suitable for heavy-duty spring and stressed components

Typical applications

• leaf springs
• coil springs
• automotive suspension components
• heavy-duty industrial springs
• agricultural and trailer springs
• components subjected to dynamic and shock loads

Equivalent steel grades

• 50CrV4 (en 10089): european standard
• en47: british standard
• aisi 6150: american standard
• din 1.8159: german standard

Why choose 50CrV4 for your application?

50CrV4 offers an excellent combination of strength, toughness, and fatigue resistance, making it ideal for components subjected to repeated stress and heavy loads. Its chromium–vanadium alloying ensures long service life and reliable performance in demanding applications.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
50CrV4	0.47–0.55	Heavy-duty springs	Q & t	Chromium–vanadium spring steel
En47	0.45–0.55	Automotive springs	Q & t	British equivalent
Aisi 6150	0.48–0.53	Industrial springs	Q & t	American equivalent

Summary

50CrV4 is a high-performance chromium–vanadium spring steel optimized for heavy-duty and dynamic load applications. It delivers high strength, excellent fatigue resistance, and long-term durability in automotive and industrial environments.