31CrV3 alloy steel

Introduction

we manufacture forging ingots, billets, and blooms in alloy steel specifically for 31CrV3, tailored for high-performance applications.

 31CrV3 is a medium carbon, chromium-vanadium alloy steel designed for high strength, excellent toughness, and superior fatigue and wear resistance. The addition of vanadium refines the grain structure and improves Mechanical properties , making this grade ideal for highly stressed and safety-critical engineering applications. 31CrV3 is widely used in forging, automotive, and heavy machinery components where reliability and long service life are essential.

This steel offers excellent machinability in the annealed condition and maintains dimensional stability after heat treatment , ensuring precise and reliable component performance. Its balance of strength, toughness, and wear resistance makes it a preferred choice for components that demand long-lasting durability under severe operating conditions.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.28 – 0.35	Provides strength and moderate hardness
Manganese (mn)	0.40 – 0.60	Improves hardenability and toughness
Sulphur (s)	Max 0.030	Controlled for better toughness and clean steel quality
Phosphorus (p)	Max 0.030	Low content improves impact strength
Silicon (si)	0.25 – 0.40	Increases strength and elasticity
Chromium (cr)	0.40 – 0.70	Improves hardenability, wear resistance, and strength
Nickel (ni)	Nil	Not present
Molybdenum (mo)	Nil	Not present
Vanadium (v)	0.07 – 0.12	Grain refinement, improves strength, toughness, and fatigue life

Mechanical properties (typical values after quenching & tempering)

• Tensile strength: Approx. 800 – 1000 MPa
• Yield strength: Approx. 550 – 750 MPa
• Hardness: 26 – 34 HRC (adjustable by heat treatment)
• Impact toughness: High
• Fatigue resistance: Very good

Heat treatment

• Annealing:  improves machinability before final processing
• Normalizing:  refines grain structure and enhances toughness
• Quenching:  heating to approx. 840 – 880°c followed by oil quenching
• Tempering:  reheating to reduce stresses and achieve optimum strength-toughness balance

Heat treatment  can be tailored to meet specific performance requirements.

Key features and benefits

• Vanadium addition for fine grain structure and enhanced Mechanical properties
• High strength with excellent toughness
• Good through-hardening characteristics
• Excellent fatigue and wear resistance
• Good machinability in annealed condition
• Dimensional stability after heat treatment
• Ideal for forging and heavy-duty machining

Typical applications

• Forged automotive components
• Connecting rods and crankshaft parts
• Gears, shafts, and axles
• Heavy-duty fasteners and bolts
• Machine and tooling components subjected to high stress

Equivalent steel grades

• 31CrV3 (en 10083-3):  european standard
• Din 1.2208:  german standard
• AISI  6150 (approx.):  american comparable grade

Why choose 31CrV3 for your application?

31CrV3 offers an excellent combination of strength, toughness, and fatigue resistance. The vanadium addition ensures superior grain control and long service life, making it a reliable choice for high-stress and safety-critical engineering applications.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
31CrV3	0.28-0.35	Forgings, shafts, gears	Quenching & tempering	Vanadium for grain refinement
En19	0.35-0.45	Heavy-duty shafts & gears	Quenching & tempering	Higher carbon, no vanadium
41Cr4	0.38-0.45	General engineering parts	Quenching & tempering	Chromium steel without vanadium

Summary

31CrV3 is a high-performance chromium-vanadium alloy steel optimized for forged and heavily loaded components. It provides consistent Mechanical properties , excellent toughness, and reliable performance in demanding industrial conditions.