Special Steel Plate Smooth Finish

• 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 SteelD2 Tool Steel is a highly versatile, high-carbon, high-chromium, air-hardening tool steel. It is well-regarded for its relatively high attainable hardness and the presence of numerous large, chromium-rich alloy carbides within its microstructure. These carbides deliver exceptional wear resistance, particularly against sliding contact with other metals and abrasive materials. While there are other steels with superior toughness or wear resistance, D2 stands out by offering a balanced blend of wear resistance, toughness, tool performance, and cost-effectiveness. The wide variety of product forms available for D2 further enhances its appeal. The remelting process enhances 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: diameter 80mm~330mm
D2 Steel Plate: thickness 25mm~400mm x width 200mm~800mm
Delivery Condition:
Turned Round Bar, Milled Plate, Black finish, with custom requirements possible.
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 detailed in the tables below. It has an elastic modulus of 207000 MPa and a specific heat capacity (Cp) of 461J/(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
To soft anneal, protect the steel and heat it uniformly to 1560°F (850°C). Cool it in the furnace at a rate of 20°F (10°C) per hour to 1200°F (650°C), then let it cool freely in the air.
Stress Relieving
After rough machining, heat the tool evenly to 1200°F (650°C) and hold it for 2 hours. Cool slowly to 930°F (500°C), then let it cool freely in the air.
Hardening
Preheat the steel to a temperature range of 1110-1290°F (650-750°C). The austenitizing temperature should be between 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 duration at the hardening temperature after the tool is thoroughly heated.
Ensure the part is protected against decarburization and oxidation during hardening.
Quenching
Quench using air or pressurized gas to a temperature range of 150-125ºF (66-51ºC). D2 Tool Steel with a thickness up to 4 inches (101.6 mm) will fully harden when air-cooled from 1575ºF (857ºC), while thicknesses up to 6 inches (152.4 mm) will harden when air-cooled from 1625ºF (885ºC).
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Tempering
Begin tempering immediately after quenching. Maintain 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. The typical tempering range is 350 to 400ºF (177 to 204ºC).
For unparalleled wear resistance, temper your steel between 300-350°F (149-177°C) to achieve an impressive hardness of 62-64 HRC. If your goal is to strike the perfect harmony between wear resistance and toughness, temper between 500-550°F (260-288°C), resulting in a robust hardness of 58-60 HRC.
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To maximize toughness, employ a double tempering process: 2 hours plus an additional 2 hours at temperatures exceeding 950°F (510°C). This meticulous process will yield a hardness below 58 HRC, ensuring your steel possesses superior toughness.
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7. D2 Tool Steel Applications
D2 tool steel is renowned for its wide range of applications, including blanking, forming, and trim dies, along with gages, slitting cutters, wear parts, and lamination dies. Ideal for thread rolling dies, drawing dies, rotary cutting dies, knurls, bending dies, shear blades, burnishing tools, rolls, machine parts, master parts, and injection screw and tip components. Additionally, D2 steel excels in seaming rolls, extrusion dies, tire shredders, scrap choppers, and more.

With over a decade of specialization in producing D2 Tool Steel, Huangshi Smooth Industry and Trade Co., Ltd proudly offers Electro-Slag Remelting (ESR) products to meet the highest quality standards. As our flagship product, D2 Tool Steel continues to set benchmarks in the industry. For any inquiries, please don't hesitate to reach out—we are committed to providing exceptional assistance and expertise.