China Origin Steel Plate Specification

• 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 - An impeccable blend of precision and resilience.

Brief Description - A snapshot of excellence.
D2 Tool Steel - The epitome of durability and performance.A versatile high-carbon, high-chromium, air-hardening tool steel, D2 Tool Steel is distinguished by its high attainable hardness and the presence of numerous, large, chromium-rich alloy carbides in its microstructure. These carbides deliver exceptional resistance to wear from sliding contact with other metals and abrasive materials. While other steels may offer improved toughness or wear resistance, D2 strikes a remarkable balance between wear resistance, toughness, tool performance, cost-effectiveness, and availability in a variety of product forms. The remelting process further enhances chemical homogeneity, refines carbide size, and significantly improves mechanical and fatigue properties.
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Size Range for D2 Tool Steel: Options as diverse as your needs.
D2 Steel Round Bar: diameter ranging from 80mm to 330mm.
D2 Steel Plate: thickness from 25mm to 400mm, with a width of 200mm to 800mm.
Delivery Condition - Tailored to your specifications.
Turned Round Bar, Milling Plate, Black, customized to meet customer requirements.
Spheroidizing Annealing, ESR material to ensure superior quality.
D2 Tool Steel Equivalent Grades - Broad compatibility.

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

D2 Tool Steel Chemical Composition - Precision-engineered for excellence.

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

D2 Tool Steel Physical Properties - Reliable performance metrics.
The physical properties of D2 Tool Steel, detailed in the tables below, include an elastic modulus of 207,000 MPa and a specific heat capacity (Cp) of 461 J/(kg·K).
Critical temperature of D2 Tool Steel - Key thermal thresholds.

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 - Precision in expansion metrics.

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

Forging of D2 Tool Steel - Crafting with precision.

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

Heat Treatment - Optimizing steel performance.
Soft Annealing - The foundation of resilience.
Protect the steel, heating through to 1560°F (850°C). Then cool in the furnace at 20°F (10°C) per hour to 1200°F (650°C), followed by air cooling.
Stress Relieving - Reinforcing strength.
After rough machining, heat the tool through to 1200°F (650°C), hold for 2 hours, then cool slowly to 930°F (500°C), and finally air cool.
Hardening - Achieving peak hardness.
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: The duration at hardening temperature once the tool is fully heated.
Protect the component from decarburization and oxidation during the hardening process.
Quenching - Securing durable hardness.
Air or pressurized gas to 150-125ºF (66-51ºC). Sizes up to 4 inches (101.6 mm) in thickness will fully harden when air cooled from 1575ºF (857ºC). Sizes up to 6 inches (152.4 mm) in thickness will fully harden when air cooled from 1625ºF (885ºC).
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Tempering - Fine-tuning toughness.
Temper immediately after quenching. Maintain the 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 maximum wear resistance, temper between 300-350°F (149-177°C) to achieve a supreme hardness of 62-64 HRC. For an optimal equilibrium between exceptional wear resistance and enhanced toughness, temper the steel between 500-550°F (260-288°C), achieving a robust hardness of 58-60 HRC.
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To attain ultimate toughness, opt for a double tempering process: temper for 2 hours, and then again for an additional 2 hours at temperatures exceeding 950°F (510°C). This meticulous approach will result in a hardness of less than 58 HRC, ensuring extraordinary toughness.
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7. D2 Tool Steel Applications
D2 tool steel is indispensable for a variety of high-performance applications including 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.

With a decade-long specialization in producing premium D2 Tool Steel, Huangshi Smooth Industry and Trade Co., Ltd. prides itself on quality. Our D2 Tool Steels are all ESR products, embodying the pinnacle of quality standards. As our best-selling product, D2 Tool Steel exemplifies excellence. Should you have any inquiries, please reach out and we will be delighted to assist you in every possible way!