Cold Work Die Steel Forging

• Customization: Available
• Type: Special Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: round bar
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• 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 SteelD2 Tool Steel is an exceptionally versatile high-carbon, high-chromium, air-hardening tool steel distinguished by its relatively high attainable hardness and abundant, large, chromium-rich alloy carbides in the microstructure. These carbides endow the steel with superior resistance to wear from sliding contact with other metals and abrasive materials. While other steels might offer improved toughness or enhanced wear resistance, D2 excels by providing a perfect balance of wear resistance, toughness, tool performance, affordability, and availability in various product forms. The remelting process enhances its chemical homogeneity, refines carbide size, and improves mechanical and fatigue properties.
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1. Size Range for D2 Tool Steel
D2 Steel Round Bar: Available in diameters ranging from 80mm to 330mm.
D2 Steel Plate: Extends from thicknesses of 25mm to 400mm and widths of 200mm to 800mm.
Delivery Condition:
Turned Round Bar, Milled Plate, Black Surface, Custom 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
The physical properties of D2 Tool Steel are listed in the tables below. The elastic modulus is 207,000 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 it through to 1560°F (850°C). Then cool in the furnace at 20°F (10°C) per hour to 1200°F (650°C), then freely in the 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 freely in the air.
Hardening
Preheat 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 = duration at hardening temperature after the tool is fully heated through.
Protect the part from decarburization and oxidation during hardening.
Quenching
Quenching methods: Air or pressurized gas to 150-125°F (66-51°C). Sizes up to 4 inches (101.6 mm) in thickness will harden through when air cooled from 1575°F (857°C). Sizes up to 6 inches (152.4 mm) in thickness will harden through when air cooled from 1625°F (885°C).
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Tempering
Temper immediately after quenching. Hold at the tempering temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours, then air cool to ambient temperature. Typical tempering range: 350-400°F (177-204°C).
To achieve unparalleled wear resistance, temper your Cold Work Die Steel Forging between 300-350°F (149-177°C), resulting in a superior hardness of 62-64 HRC. For those seeking the perfect harmony between wear resistance and toughness, temper between 500-550°F (260-288°C) to achieve a balanced hardness of 58-60 HRC.
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For utmost toughness, employ a double tempering process of 2 hours each, at temperatures exceeding 950°F (510°C). This meticulous approach will yield a reduced hardness of less than 58 HRC, optimizing the material's durability.
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7. D2 Tool Steel Applications
D2 tool steel is a versatile and reliable choice for a wide array of applications. Its typical uses include blanking, forming, and trim dies, gages, slitting cutters, wear parts, lamination dies, thread rolling dies, drawing dies, rotary cutting dies, knurls, bending dies, gages, shear blades, burnishing tools, rolls, machine parts, master parts, injection screw and tip components, seaming rolls, extrusion dies, tire shredders, scrap choppers, and much more.

At Huangshi Smooth Industry and Trade Co., Ltd, we have proudly specialized in the production of D2 Tool Steel for over a decade. Our commitment to excellence means all our D2 Tool Steels are ESR products, ensuring the highest quality standards. As our best-selling product, D2 Tool Steel is a testament to our dedication. Should you have any inquiries, please don't hesitate to contact us—we are here to assist you in every possible way!