H13 hot work tool steel

Introduction

We manufacture forging ingots, billets, and blooms in alloy steel specifically for H13, tailored for high-performance applications. 

H13 is a high-alloy chromium–molybdenum–vanadium hot work tool steel renowned for its excellent hot strength, outstanding toughness, and superior resistance to thermal fatigue. It is specifically designed for applications that require sustained performance at elevated temperatures under high mechanical and thermal stress.

Due to its ability to maintain hardness and strength at high temperatures, H13 is widely used in die casting, forging, and hot extrusion applications where tool life and reliability are critical. This steel offers excellent machinability in the annealed condition and can be heat treated to achieve optimal balance of toughness and wear resistance.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.32 – 0.45	Provides hardness and strength
Manganese (mn)	0.20 – 0.50	Improves hardenability
Sulphur (s)	Max 0.030	Controlled to maintain toughness
Phosphorus (p)	Max 0.030	Impurity; low content improves impact strength
Silicon (si)	0.80 – 1.20	Enhances temper resistance and hot strength
Chromium (cr)	4.75 – 5.50	Provides high hardenability, wear resistance, and oxidation resistance
Nickel (ni)	Nil	Not present
Molybdenum (mo)	1.10 – 1.75	Improves hot hardness and creep resistance
Vanadium (v)	0.80 – 1.20	Refines grain structure and improves wear resistance

Mechanical properties(typical values after hardening & tempering)

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

Heat treatment

• annealing: for machinability before final heat treatment
• hardening: heating to approx. 1020 – 1050°c followed by air or oil quenching
• tempering: double or triple tempering to achieve optimum toughness and hot strength

Proper heat treatment is essential to maximize tool life and prevent premature failure.

Key features and benefits

• excellent hot strength and hot hardness
• superior resistance to thermal shock and heat checking
• good toughness and impact resistance
• high resistance to softening at elevated temperatures
• good machinability in annealed condition
• long tool life in hot work applications

Typical applications

• die casting dies (aluminum, magnesium, zinc)
• hot forging dies and inserts
• extrusion dies and mandrels
• hot shear blades
• press tools and hot punches
• plastic mould components requiring high temperature stability

Equivalent steel grades

• H13 (aisi): american standard
• x40crmov5-1 (en iso 4957): european standard
• din 1.2344: german standard
• skd61: japanese standard

Why choose H13 for your application?

H13 is the industry standard for hot work tooling where high temperature stability, toughness, and resistance to thermal fatigue are essential. Its balanced alloy design ensures reliable performance and extended tool life in severe operating conditions.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
H13	0.32–0.45	Die casting, forging dies	Hardening & tempering	Excellent hot work steel
H11	0.35–0.45	Hot forging dies	Hardening & tempering	Lower vanadium
1.2344	0.38–0.42	Die casting dies	Hardening & tempering	European equivalent

Summary

H13 is a high-performance hot work tool steel engineered for extreme thermal and mechanical stress. With excellent hot hardness, toughness, and resistance to heat checking, it is the preferred choice for die casting, forging, and hot forming tools.