SAE-AISI H13 Tool Steel (T20813) Chromium Hot-Work Steel

H13 Tool Steel is a chromium-molybdenum hot-work tool steel known for its excellent toughness, high wear resistance, and ability to withstand high temperatures. It has a balanced composition of chromium, molybdenum, and vanadium, providing it with good thermal conductivity and high resistance to thermal fatigue, making it ideal for hot-work applications.

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our H13 Tool Steel Supply: Available Forms and Sizes

Form	Thickness / Diameter	Width	Length
H13 Tool Steel Sheets	1 mm – 20 mm	300 mm – 1200 mm	1000 mm – 3000 mm
H13 Tool Steel Plates	10 mm – 100 mm	500 mm – 2000 mm	1000 mm – 6000 mm
H13 Tool Steel Round Bars	10 mm – 500 mm diameter	–	1000 mm – 6000 mm
H13 Tool Steel Flat Bars	5 mm – 80 mm thickness	20 mm – 500 mm	1000 mm – 6000 mm
H13 Tool Steel Blocks	Customizable thickness	Customizable	Customizable
H13 Tool Steel Square Bars	10 mm – 200 mm	10 mm – 200 mm	1000 mm – 6000 mm

Notes:

Custom Sizes: Available upon request based on specific requirements.
Tolerance: Dimensions may vary according to industry standards and client specifications.
Heat Treatment: H13 Tool Steel can be supplied in annealed or pre-hardened conditions.

H13 Tool Steel material properties datenblatt as below:

chemical composition of H13 Tool Steel

Element	Content (%)
Carbon (C)	0.32 – 0.45
Chromium (Cr)	4.75 – 5.50
Molybdenum (Mo)	1.10 – 1.75
Vanadium (V)	0.80 – 1.20
Silicon (Si)	0.80 – 1.20
Manganese (Mn)	0.20 – 0.50
Phosphorus (P)	0.03 max
Sulfur (S)	0.03 max

Physical Properties of H13 Tool Steel

Physical Property	Value
Density	7.80 g/cm³
Thermal Expansion	11.0 x 10⁻⁶ /°C (20-100°C)
Thermal Conductivity	28.6 W/m·K at 20°C
Specific Heat Capacity	460 J/kg·K
Electrical Resistivity	0.55 x 10⁻⁶ Ω·m
Melting Point	1427°C

Mechanical Properties of H13 Tool Steel

Mechanical Property	Value
Hardness (Rockwell)	48 – 52 HRC (after heat treatment)
Tensile Strength	Approximately 1,450 MPa
Yield Strength	Approximately 1,200 MPa
Modulus of Elasticity	210 GPa
Impact Toughness	High (suitable for hot-work applications)
Elongation at Break	10 – 15% (varies with treatment)

Applications of H13 Tool Steel:

Die Casting Dies: Suitable for molds exposed to high temperatures.
Extrusion Dies: Ideal for shaping metals under intense heat.
Forging Dies: Used in high-impact, high-temperature forging processes.
Plastic Molds: Effective for plastic injection molds due to thermal stability.
Hot Shear Blades: Withstands high heat during cutting operations.

Different Designations for H13 Tool Steel:

Standard	Designation
UNS	T20813
AISI/SAE	H13
DIN	1.2344
JIS	SKD61
ISO	X40CrMoV5-1
BS	BH13
EN	X40CrMoV5-1

Fabrication and Heat Treatment of H13 Tool Steel:

Fabrication:

Machining: H13 is relatively difficult to machine due to its high hardness, but it can be machined in its annealed state. Carbide-tipped tools are often recommended for better tool life.
Grinding: H13 can be ground to precise dimensions after hardening, commonly used for final finishing.
Welding: Welding H13 requires preheating to avoid cracking and post-weld heat treatment to restore hardness and toughness.

Heat Treatment:

Annealing:
- Heat slowly to 840-860°C, hold for a uniform soak, then cool at a rate not exceeding 10°C per hour down to 600°C. This process produces a maximum hardness of 229 HB (Brinell Hardness).
Stress Relieving:
- To relieve machining-induced stress, heat to 600-650°C, hold for 1-2 hours, then cool in air. This process minimizes distortion in further heat treatments.
Hardening:
- Preheat H13 to 600-700°C, then raise to 1000-1030°C and hold until uniformly heated. Quench in still air, oil, or pressurized gas for large sections. Air cooling minimizes distortion.
Tempering:
- Temper immediately after hardening by heating to 500-650°C for desired hardness, holding for 2 hours, then air cooling. Typically, H13 is tempered 2-3 times to increase toughness and thermal stability.