Smooth Finish Alloy Steel Plate

• 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 stands out with its relatively high attainable hardness and rich chromium-rich alloy carbides peppered throughout its microstructure. These carbides endow the steel with excellent resistance to wear from both sliding metal contact and abrasive materials. While there are other steels available that offer enhanced toughness or superior wear resistance, D2 Tool Steel excels by offering a balanced combination of wear resistance, toughness, tool performance, price, and availability in a wide variety of forms. The remelting process further refines its chemical homogeneity and carbide size, enhancing its 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, customized 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 listed in the tables below. The elastic modulus is 207,000 MPa, and the specific heat capacity 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 freely in air.
Stress Relieving
After rough machining, heat the tool through to 1200°F (650°C) and hold for 2 hours. Cool slowly to 930°F (500°C), then allow to cool 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.
Ensure the part is protected against decarburization and oxidation during hardening.
Quenching
Quench using air or pressurized gas to 150-125°F (66-51°C). Sections up to 4 inches (101.6 mm) thick will fully harden when cooled in air from 1575°F (857°C). Sections up to 6 inches (152.4 mm) thick will fully harden when air cooled from 1625°F (885°C).
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Tempering
Temper immediately after quenching, holding at temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum hold time of 2 hours. Allow to air cool to ambient temperature. Ideal tempering range is 350 to 400°F (177 to 204°C).
For unparalleled wear resistance, temper between 300-350°F (149-177°C) to achieve an impressive hardness of 62-64 HRC. For those seeking the perfect equilibrium between wear resistance and toughness, temper between 500-550°F (260-288°C) to attain a 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 method will yield a hardness of less than 58 HRC, ensuring peak performance.
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7. D2 Tool Steel Applications
D2 Tool Steel is ideal for a wide array 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, shear blades, burnishing tools, rolls, machine parts, master parts, injection screw and tip components, seaming rolls, extrusion dies, tire shredders, scrap choppers, and more.

With over a decade of specialization in producing D2 Tool Steel, we have continually pursued higher quality standards. All our D2 Tool Steel products are ESR (Electro-Slag Remelted) to ensure superior quality. D2 Tool Steel remains our top-selling product. For any inquiries, please don't hesitate to contact us—we are committed to providing the best assistance possible!