Forged Cold Work Tool Steel Round Bar

• 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. It stands out for its relatively high attainable hardness and numerous, large, chromium-rich alloy carbides in its microstructure. These carbides offer exceptional wear resistance from sliding contact with other metals and abrasive materials. While there are other steels with heightened toughness or wear resistance, D2 provides a balanced combination of wear resistance, toughness, tool performance, cost-efficiency, and a variety of product forms. The remelting process enhances chemical homogeneity, refines carbide size, and delivers notable 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, Milling Plate, Black, customized 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
The physical properties of D2 Tool Steel are detailed in the tables below. Elastic modulus: 207000 MPa; Specific heat at constant pressure (Cp): 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 air.
Stress Relieving
After rough machining, the tool should be heated through 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 once the tool is fully heated through.
Protect the part against decarburization and oxidation during the hardening process.
Quenching
Quench using air or pressurized gas to 150-125ºF (66-51ºC). Thicknesses up to 4 inches (101.6 mm) will harden through air cooling from 1575ºF (857ºC). Thicknesses up to 6 inches (152.4 mm) will harden through air cooling from 1625ºF (885ºC).
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Tempering
Temper immediately after quenching. Hold at the specified 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 the steel between 300-350°F (149-177°C) to achieve a remarkable hardness of 62-64 HRC. For those seeking the perfect harmony between wear resistance and toughness, tempering between 500-550°F (260-288°C) will yield an impressive 58-60 HRC.
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For exceptional toughness, perform a double tempering process, with each session lasting 2 hours, at temperatures exceeding 950°F (510°C). This meticulous treatment will result in a hardness of less than 58 HRC, ensuring optimal durability.
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7. D2 Tool Steel Applications
D2 tool steel is the material of choice for numerous high-performance applications, including but not limited to 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 so much more.

With over a decade of expertise in producing D2 Tool Steel, Huangshi Smooth Industry and Trade Co., Ltd is dedicated to pursuing the highest quality standards. Our D2 Tool Steels are exclusively ESR products, ensuring superior performance. D2 Tool Steel is our flagship offering, and we are always here to assist you. Should you have any inquiries, please contact us, and we will be delighted to provide our utmost support!