Alloy Steel Round Bar Forged

• 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 versatile high-carbon, high-chromium, air-hardening tool steel known for its remarkable hardness and the presence of numerous, large, chromium-rich alloy carbides in its microstructure. These carbides offer excellent resistance to wear from sliding contact with other metals and abrasive materials. While other steels may offer enhanced toughness or wear resistance, D2 strikes a perfect balance between wear resistance, toughness, tool performance, price, 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: diameter ranges from 80mm to 330mm.
D2 Steel Plate: thickness ranges from 25mm to 400mm, with widths between 200mm and 800mm.
Delivery Condition:
Turned Round Bar, Milling Plate, Black, meeting 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
The physical properties of D2 Tool Steel are listed 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 thoroughly to 1560°F (850°C). Then cool in the furnace at a rate of 20°F (10°C) per hour to 1200°F (650°C), followed by cooling freely in air.
Stress Relieving
After rough machining, heat the tool to 1200°F (650°C) for a holding time of 2 hours. Cool slowly to 930°F (500°C), then 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 duration at the hardening temperature after the tool is fully heated through.
Protect the part against decarburization and oxidation during the hardening process.
Quenching
Quench in air or pressurized gas to 150-125ºF (66-51ºC). Sizes up to 4 inches (101.6 mm) in thickness will harden throughout when air-cooled from 1575ºF (857ºC). Sizes up to 6 inches (152.4 mm) will harden throughout when air-cooled from 1625ºF (885ºC).
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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. 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 a remarkable hardness of 62-64 HRC. If you seek the perfect equilibrium between wear resistance and toughness, temper within the range of 500-550°F (260-288°C), yielding an impressive hardness of 58-60 HRC.
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To maximize toughness, perform a double tempering process for 2 hours plus an additional 2 hours at temperatures exceeding 950°F (510°C). This method ensures a hardness level below 58 HRC, optimizing the material's durability.
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7. D2 Tool Steel Applications
D2 tool steel is versatile and ideal for a variety of 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 more.

For over a decade, we at Huangshi Smooth Industry and Trade Co., Ltd have been experts in producing top-quality D2 Tool Steel. Committed to the highest standards, all our D2 Tool Steels are ESR products. As our best-selling product, D2 Tool Steel stands out in quality. Should you have any inquiries, please contact us, and we will be delighted to assist you!