Premium Cold Work Tool Steel Forging

• Type: Special Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: round bar
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Free Cutting Steel, Mold Steel
• Application: Die Steel Bar
• Transport Package: Wooden
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7214100000
• Production Capacity: 5000

Product Description

1.2379/D2/SKD11

Brief Description
D2 Tool Steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium-rich alloy carbides in the microstructure. These carbides provide exceptional resistance to wear from sliding contact with other metals and abrasive materials. While there are other steels available with either improved toughness or enhanced wear resistance, D2 offers an effective combination of wear resistance, toughness, tool performance, cost-efficiency, and a vast array of product forms. The remelting process ensures improved chemical homogeneity, refined carbide size, and corresponding improvements in mechanical and fatigue properties.
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1. Size Range for D2 Tool Steel
D2 Steel Round Bar: diameter 80mm~330mm
D2 Steel Plate: thickness 25mm~400mm x width 200mm~800mm
Delivery Condition:
Turned Round Bar, Milled Plate, Black, as per customer requirements.
Spheroidizing Annealing, ESR material.
2. D2 Tool Steel Equivalent Grades

Country	USA	German		Japan	China
Standard	ASTM A681	W-nr.	DIN	JISG4404	GB/T1299-2000
Grades	D2	1.2379	X155CrVMo121	SKD11	Cr12Mo1V1

3. D2 Tool Steel Chemical Composition

Grades	C%	Si%	Mn%	P%	S%	Cr%	Mo%	V%
D2	1.40~1.60	0.30~0.50	0.30~0.50	≤0.03	≤0.03	11.0~13. 0	0.70~1.20	0.80~1.10
1.2379/X155CrVMo121	1.50~1.60	0.10~0.40	0.15~0.45	≤0.03	≤0.03	11.0~12.0	0.60~0.80	0.90~1.10
SKD11	1.40~1.60	≤0.40	≤0.60	≤0.030	≤0.030	11.0~13. 0	0.80~1.20	0.20~0.50

4. D2 Tool Steel Physical Properties
Physical properties of D2 Tool Steel are detailed in the tables below. The elastic modulus stands at 207000 MPa, and the specific heat at constant pressure Cp is 461 J/(kg·K).
Critical temperature of D2 Tool Steel

Critical point	Ac1	Acm	Arcm	Ar1	Ms
Temp.(approximation)	1490°F (810°C)	1607°F (875°C)	1382°F (750°C)	1283°F (695°C)	374°F (190°C)

Coefficient of linear thermal expansion

Temperature	68~212°F (20~100°C)	68~392°F (20~200°C)	68~572°F (20~300°C)	68~752°F (20~400°C)
Coefficient	10.5 x10^-6	11.5 x10^-6	11.9 x10^-6	12.2 x10^-6

5. Forging of D2 Tool Steel

Items	Heating temperature	Starting forging temperature	Final forging temperature	Cooling
Ingot	2048~2120°F (1120~1160°C)	1922~1994°F (1050~1090°C)	≥1562°F(850°C)	Hot charging annealing
billet	2048~2084°F (1120~1140°C)	1922~1958°F (1050~1070°C)	≥1562°F(850°C)	Hot charging annealing,cooling in hole or dust

6. Heat Treatment
Soft Annealing
Protect the steel and heat thoroughly to 1560°F (850°C). Cool slowly in the furnace at 20°F (10°C) per hour down to 1200°F (650°C), then allow to cool freely in air.
Stress Relieving
After rough machining, heat the tool through to 1200°F (650°C), holding for 2 hours. Cool slowly to 930°F (500°C), then allow to cool freely in air.
Hardening
Preheating temperature: 1110-1290°F (650-750°C). Austenitizing temperature: 1810-1920°F (990-1050°C), typically 1830-1905°F (1000-1040°C).

Temperature		Soaking time (min)	Hardness before tempering
°F	°C
1815	990	60	approx. 63 HRC
1850	1010	45	approx. 64 HRC
1885	1030	30	approx. 65 HRC

* Soaking time refers to the time at hardening temperature after the tool is fully heated through.
Protect the part against decarburization and oxidation during hardening.
Quenching
Utilize air or pressurized gas to cool to 150-125ºF (66-51ºC). Thicknesses up to 4 inches (101.6 mm) will through-harden when air cooled from 1575ºF (857ºC). Thicknesses up to 6 inches (152.4 mm) will through-harden when air cooled from 1625ºF (885ºC).
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Tempering
Commence tempering immediately after quenching. Hold at the designated temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours, then air cool to ambient temperature. The typical tempering range is 350 to 400ºF (177 to 204ºC).
For unparalleled wear resistance, temper between 300-350°F (149-177°C) to achieve an exceptional hardness of 62-64 HRC. For the perfect equilibrium between wear resistance and toughness, tempering at 500-550°F (260-288°C) will yield an impressive 58-60 HRC.
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For maximum toughness, employ a double tempering process: 2 hours plus an additional 2 hours at temperatures exceeding 950°F (510°C). This meticulous procedure will result in a hardness that is less than 58 HRC, ensuring robust performance.
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7. D2 Tool Steel Applications
D2 tool steel is exceptionally versatile and commonly used for blanking, forming, and trim dies. Additional applications include gages, slitting cutters, wear parts, lamination dies, thread rolling dies, drawing dies, rotary cutting dies, knurls, bending dies, shear blades, burnishing tools, rolls, machine parts, master parts, injection screw and tip components, seaming rolls, extrusion dies, tire shredders, scrap choppers, and more.

For over a decade, we have been dedicated to producing D2 Tool Steel, meticulously crafted to meet the highest quality standards. All our D2 Tool Steels are ESR products, reflecting our commitment to excellence. As our flagship and best-selling product, D2 Tool Steel stands out in the market. Should you have any inquiries, please do not hesitate to contact us. We are here to provide unmatched support and assistance!