H11 hot work tool steel

Introduction

We manufacture forging ingots, billets, and blooms in alloy steel specifically for H11, tailored for high-performance applications. 

H11 is a chromium–molybdenum–vanadium hot work tool steel designed for applications requiring high toughness, good hot strength, and excellent resistance to thermal shock. Compared to H13, H11 contains lower vanadium and chromium content, which results in improved toughness and resistance to cracking under severe thermal cycling.

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 hardenability 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: 40 – 50 hrc (application dependent)
• hot hardness: very good
• impact toughness: excellent
• thermal fatigue resistance: very good
• wear resistance: good

Heat treatment

• annealing: for improved machinability prior to final heat treatment
• hardening: heating to approx. 1000 – 1030°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 heat checking or premature failure.

Key features and benefits

• excellent toughness and resistance to cracking
• very good hot strength and hot hardness
• high resistance to thermal shock and fatigue
• good dimensional stability during heat treatment
• good machinability in annealed condition
• reliable performance in severe hot work conditions

Typical applications

• hot forging dies and inserts
• die casting dies (aluminum and magnesium)
• hot extrusion dies and mandrels
• hot punches and press tools
• hot shear blades
• plastic mould inserts subjected to high temperatures

Equivalent steel grades

• H11 (aisi): american standard
• x38crmov5-1 (en iso 4957): european standard
• din 1.2343: german standard
• skd6: japanese standard

Why choose H11 for your application?

H11 is the ideal choice for hot work tooling where high toughness, resistance to thermal shock, and reliable performance are required. Its balanced alloy design makes it particularly suitable for applications involving rapid temperature changes and high impact loads.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
H11	0.35–0.45	Hot forging, die casting	Hardening & tempering	High toughness
H13	0.32–0.45	Die casting dies	Hardening & tempering	Higher wear resistance
1.2343	0.36–0.42	Hot work tools	Hardening & tempering	European equivalent

Summary

H11 is a tough and reliable hot work tool steel engineered for demanding applications involving extreme heat and mechanical stress. It offers an excellent combination of hot strength, toughness, and thermal fatigue resistance, ensuring long tool life and consistent performance.