What Makes H13 Steel Special?

H13 belongs to the chromium–molybdenum–vanadium family of hot work tool steels. It is specifically engineered to withstand repeated heating and cooling cycles – without cracking, deforming, or losing hardness.

That’s why H13 shows up in some of the most demanding applications on the shop floor, from high-pressure die casting to forging presses and plastic mould tooling.

Key Performance Characteristics of H13

• Thermal fatigue resistance → Minimises heat checking and surface cracking
• Red hardness → Retains strength up to ~600°C
• Good toughness → Reduces chipping under cyclic stress
• Wear resistance → Extends tool life and lowers replacement frequency
• Excellent polishability → Ideal for plastic moulds requiring fine surface finish

These properties don’t happen by accident – they come from a carefully controlled chemical balance.

Chemical Composition of H13 Steel

Standard	AISI (UNS)	C (%)	Si (%)	Mn (%)	P (≤ %)	S (≤ %)	Cr (%)	Mo (%)	V (%)
ASTM A681	H13, / DIN 1.2344 /, AISI H13 (T20813)	0.32 - 0.45	0.80 - 1.25	0.20 - 0.60	0.030	0.030	4.75 - 5.50	1.10 - 1.75	0.80 - 1.20

AISI H13 / DIN 1.2344 technical specifications

Mechanical Properties

ITEMS	Value
Hardness (HBW)	235 MAX (ANNEALED)
Hardness After Quenching (HRC)	52 MIN. (ANNEALED)
Tensile Strength (MPa)	1,450 - 1,950
Yield Strength (MPa)	1,200 - 1,550
Elongation at Break	10 - 15 %
Impact Toughness (J at 20°C)	20 - 30

Applications Across Industries

The real strength of H13 lies in its versatility. Wherever tools are exposed to heat, pressure and repeated cycles, H13 proves its value.

Typical Applications

Physical & Thermal Properties

To understand why H13 performs so reliably in hot environments, it’s important to look at its physical and thermal behaviour.

Category	Property / Temperature (°C)	Value	Unit
Physical Properties	Density	7.80	g/cm³
	Modulus of Elasticity	215	GPa
Thermal Expansion	300	12.2	×10⁻⁶ /°C
	400	12.5	×10⁻⁶ /°C
	500	12.9	×10⁻⁶ /°C
	600	13.0	×10⁻⁶ /°C
Thermal Conductivity	20	25.0	W/m·K
	500	28.3	W/m·K
	600	29.3	W/m·K

Heat Treatment & Processes

• Soft Annealing: Heat to 750–800 °C under protection, furnace cool slowly to 600 °C, then air cool.
• Stress Relieving: After rough machining, heat to ~650 °C, hold for 2 hours, cool slowly to 500 °C, then air cool.
• Hardening: Preheat in stages (600–850 °C), austenitise at 1020–1050 °C; protect against decarburisation and oxidation.
• Quenching: High-speed gas or controlled atmosphere; interrupted quenching recommended to minimise distortion and cracking.
• Martempering: Salt bath or fluidised bed at 450–550 °C (or 180–220 °C for low-temperature martempering), followed by air or warm oil cooling.
• Heat  Treatment: One of the reasons H13 is so widely used is its forgiving heat-treatment window. With proper hardening and tempering, it achieves an excellent balance of hardness and toughness.

Tempering °C	HRC
100	54
210	53
300	53
400	55
500	56
550	54
600	51
650	43
700	34

Manufacturing Range

Products	Diameter (mm)
Hot Rolled bar	8 - 65
Forged and Turned bars	65.2 - 500
Forged Square Bars	50 - 500

Flats

Thickness	Width
6.00 mm - 410.00 mm	20.00 mm - 700.00 mm

India’s Growing Role in H13 Manufacturing

Over the last two decades, India has emerged as a major hub for special steel manufacturing. With rising demand from automotive, aerospace, energy and infrastructure sectors, global buyers are increasingly sourcing H13 from Indian manufacturers.

What they’re looking for is simple:

• Consistent quality
• International standards compliance
• Competitive pricing
• Reliable export logistics

And this is where experienced manufacturers stand apart.

Toolman Special Steels: 65+ Years of H13 Expertise

At Toolman Special Steels, H13 isn’t just another grade – it’s a craft refined over generations.

Our manufacturing ecosystem includes:

For critical applications, ESR processing further enhances steel cleanliness, structural uniformity, and resistance to thermal fatigue.

Every H13 bar or block undergoes:

• Ultrasonic testing for internal soundness
• Hardness profiling for batch consistency
• Metallurgical inspection for cleanliness and grain uniformity
• Custom heat treatment, tailored to end-use requirements

Why Global Clients Trust Toolman

As an established H13 steel manufacturer in India, Toolman supplies to USA, Europe, Japan, China and Turkey.

Clients choose us for:

• Certified material test certificates (MTCs)
• Export-ready packaging and logistics
• Custom sizes and machining stock
• Technical support that goes beyond supply

Final Word

H13 steel is more than just a material – it’s the backbone of modern hot work tooling. And at Toolman Special Steels, we’ve spent over six decades ensuring that backbone remains strong, reliable and globally trusted.

 Get in touch: indiatoolman@gmail.com
 Learn more: www.toolmansteels.com

Download the AISI H13 / DIN 1.2344 Technical Datasheet →
(tempering curves & supply range)