Forged Cold Work Tool Steel 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 highly versatile, high-carbon, high-chromium, air-hardening tool steel known for its exceptional hardness and the presence of numerous, large, chromium-rich alloy carbides in its microstructure. These carbides provide excellent wear resistance against sliding contact with other metals and abrasive materials. While there are steels with improved toughness or wear resistance, D2 Tool Steel offers an effective balance of performance, wear resistance, toughness, and cost. The remelting process further enhances the chemical homogeneity, refines carbide size, and improves mechanical and fatigue properties, making it ideal for a wide variety of applications.
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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; tailored to 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. 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 through to 1560°F (850°C). Then cool in the furnace at 20°F (10°C) per hour to 1200°F (650°C), then in the air.
Stress Relieving
After rough machining, the tool should be heated through to 1200°F (650°C) for 2 hours. Cool slowly to 930°F (500°C), then in the 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 is the time at the hardening temperature after the tool is fully heated through.
Protect the part against decarburization and oxidation during hardening.
Quenching
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) will fully harden 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).
To achieve unparalleled wear resistance, temper your Forged Cold Work Tool Steel Bar between 300-350°F (149-177°C). This precise temperature range ensures a formidable hardness of 62-64 HRC. For those seeking the ideal equilibrium of wear resistance and toughness, a tempering range of 500-550°F (260-288°C) is recommended, yielding an impressive hardness of 58-60 HRC.
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Maximize the toughness of your tool steel by employing a double tempering process. This involves tempering for 2 hours followed by an additional 2 hours at temperatures exceeding 950°F (510°C). This meticulous process results in a reduced hardness level, achieving less than 58 HRC for superior resilience.
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7. D2 Tool Steel Applications
Our D2 Tool Steel is incredibly versatile, serving a multitude 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 many more specialized uses.

For over a decade, Huangshi Smooth Industry and Trade Co., Ltd has been at the forefront of D2 Tool Steel production. Our commitment to excellence is evident in our exclusive use of ESR (Electroslag Remelting) technology, ensuring the highest quality standards. D2 Tool Steel is our flagship product, and we are dedicated to meeting your needs. Should you have any inquiries, please do not hesitate to contact us. We are here to provide unparalleled support and service!