SAE-AISI D2 Tool Steel (T30402) Chromium Cold-Work Steel

D2 tool steel is a high-carbon, high-chromium, air-hardening tool steel widely known for its excellent wear resistance and toughness. This steel contains 1.5-2% carbon and 11-13% chromium, providing a strong carbide structure that significantly enhances its durability and wear resistance. Due to these properties, D2 is often utilized in manufacturing tools that require high precision and durability, such as cutting tools, dies, and punches.

Please inquire now about your steel needs.

our D2 Tool Steel Supply: Available Forms and Sizes

Form	Thickness / Diameter	Width	Length
D2 Tool Steel Sheets	0.5 mm – 20 mm	300 mm – 1200 mm	1000 mm – 3000 mm
D2 Tool Steel Plates	10 mm – 100 mm	500 mm – 2000 mm	1000 mm – 6000 mm
D2 Tool Steel Round Bars	10 mm – 500 mm diameter	–	1000 mm – 6000 mm
D2 Tool Steel Flat Bars	5 mm – 100 mm thickness	20 mm – 500 mm	1000 mm – 6000 mm
D2 Tool Steel Blocks	Customizable thickness	Customizable	Customizable
D2 Tool Steel Square Bars	10 mm – 300 mm	10 mm – 300 mm	1000 mm – 6000 mm

Notes:

Custom Sizes: Custom dimensions may be available upon request based on manufacturing capabilities.
Tolerance: Dimensional tolerances will vary based on specific requirements and standards.
Heat Treatment: D2 tool steel can be delivered in annealed or pre-hardened conditions depending on application needs.

D2 Tool Steel material properties datenblatt as below:

chemical composition of D2 Tool Steel

Element	Content (%)
Carbon (C)	1.50 – 2.00
Chromium (Cr)	11.00 – 13.00
Molybdenum (Mo)	0.60
Vanadium (V)	0.30
Manganese (Mn)	0.60
Silicon (Si)	0.60
Phosphorus (P)	0.03 (max)
Sulfur (S)	0.03 (max)

Physical Properties of D2 Tool Steel

Physical Property	Value
Density	7.7 – 7.8 g/cm³
Thermal Expansion	10.4 x 10⁻⁶ /°C (20-100°C)
Thermal Conductivity	20.3 W/m·K at 20°C
Specific Heat Capacity	460 J/kg·K
Electrical Resistivity	0.75 x 10⁻⁶ Ω·m
Melting Range	1421 – 1454°C

Mechanical Properties of D2 Tool Steel

Mechanical Property	Value
Hardness (Rockwell)	55 – 62 HRC (after heat treatment)
Tensile Strength	Up to 1,965 MPa (varies with treatment)
Yield Strength	Approximately 1,725 MPa
Compressive Strength	High, varies with heat treatment
Impact Toughness	Moderate (lower compared to other tool steels)
Modulus of Elasticity	210 GPa
Elongation at Break	5 – 6% (depends on treatment)

Applications of D2 Tool Steel:

Cutting Tools: Ideal for dies, punches, and blades due to high wear resistance.
Forming Tools: Used in molds and forming dies for precision and durability.
Industrial Knives: Suitable for industrial-grade blades requiring toughness.
Cold Work Applications: Excellent for cold-forming and stamping operations.
Shear Blades: Effective in shearing and trimming tools for metals and non-metals.

Different Designations for D2 Tool Steel:

Standard	Designation
UNS	T30402
AISI/SAE	D2
DIN	1.2379
JIS	SKD11
ISO	X153CrMoV12
BS	BD2
EN	X155CrVMo12-1

Fabrication and Heat Treatment of D2 Tool Steel:

Fabrication

Machining: D2 tool steel is challenging to machine due to its high hardness. It is usually machined in an annealed state to reduce tool wear.
Grinding: Suitable for grinding applications, which is often needed for achieving the final dimensions and surface finish.
Welding: Difficult to weld due to high carbon content, and preheating and post-weld heat treatment are essential to avoid cracking.
Forming: D2 can be formed, but its high strength makes it more challenging than other tool steels.

Heat Treatment

Annealing:
- Heat to 850-900°C, hold for 1-2 hours, and then cool slowly in the furnace at a rate of 10°C per hour until reaching approximately 600°C. Air cooling can be used thereafter.
Hardening:
- Preheat to 750-800°C, then heat to the austenitizing temperature of 980-1040°C. Hold at temperature and then quench in still air or oil, depending on the part size.
Tempering:
- After hardening, temper D2 at 150-540°C depending on the desired hardness. Multiple tempering cycles are often recommended to ensure dimensional stability.
Stress Relieving (optional):
- D2 may be stress relieved before hardening by heating to 600-700°C, holding for 1-2 hours, and air cooling.