High Wear AISI D2 Tool Steel

Product Overview

DIN 1.2379 is a world-class high-carbon, high-chromium cold work tool steel that meets the German standard DIN 17350. Celebrated for its exceptional wear resistance, impressive hardness, and balanced toughness, this steel is a preferred choice for precision tools and molds that operate under high-stress conditions. It boasts global recognition with equivalent grades such as AISI D2 (ASTM A681), X153CrMoV12 (ISO 4957), JIS SKD11 (JIS G4404), and Chinese Cr12Mo1V1 (GB/T 1299), making it a staple in international manufacturing. The addition of molybdenum and vanadium elevates its performance, ensuring superior edge retention, dimensional stability, and resistance to wear—even in the most demanding cold working applications.

Product Features

Multicomponent Alloy Advantage

DIN 1.2379’s unique blend of carbon (1.50-1.60%), chromium (11.00-12.00%), molybdenum (0.60-0.80%), and vanadium (0.90-1.10%) delivers a winning combination of wear resistance, hardness, and toughness—outperforming many standard cold work tool steels.

Exceptional Wear & Impact Resistance

The alloy’s composition minimizes abrasive wear and allows it to withstand impact loads, making it ideal for tools and molds subjected to repeated use and high pressure.

Even after rigorous heat treatment and prolonged use, DIN 1.2379 maintains precise dimensions, reducing scrap rates and ensuring consistent part quality in mass production.

1: Steel equivalent

Country	USA	ISO	Germany	China	Japan
Standard	ASTM A681	ISO 4957	DIN17350	GB/T1299	JIS G4404
Grade	D2	X153CrMoV12	1.2379	Cr12Mo1V1	SKD11

2: Chemical composition

Grade	C	Si	Mn	P	S	Cr	Mo	V
D2	1.40-1.60	0.10-0.60	0.10-0.60	0.030Max	0.030Max	11-13	0.70-1.20	0.50-1.10
X153CrMoV12	1.45-1.60	0.10-0.60	0.20-0.60	0.030Max	0.030Max	11-13	0.70-1.00	0.70-1.00
1.2379	1.50-1.60	0.10-0.40	0.15-0.45	0.030Max	0.030Max	11-12	0.60-0.80	0.90-1.10
Cr12Mo1V1	1.40-1.60	0.60Max	0.60Max	0.030Max	0.030Max	11-13	0.70-1.20	0.50-1.10
SKD11	1.40-1.60	0.40Max	0.60Max	0.030Max	0.030Max	11-13	0.80-1.20	0.20-0.50

3: Surface hardness and hardenability

Heat Treatment	Hardness
Annealed (+A)	HB255Max
Cold-drawn condition	HB269Max
Hardening and Tempering (+HT)	HRC61 Min

4: Supply size & Tolerance & Stock size

Product type	Size range	Length
Hot rolled bar	Φ10-Φ190mm	2000-5800mm
Hot forged bar	Φ200-Φ600mm	2000-5800mm
Hot rolled plate/sheet	T:10-60mm; W:310-810mm	2000-5800mm
Hot forged plate	T:70-250mm; W:310-810mm	2000-5800mm
Hot Forged block	T: 260-500mm; W: 300-1000mm	2000-5800mm

Surface Finish	Turned	Milled	Grinding(Best)	Polished(Best)	Peeled(Best)	Black Forged	Black Rolled
Tolerance	+0/+3mm	+0/+3mm	+0/+0.05mm	+0/+0.05mm	+0/+0.1mm	+0/+5mm	+0/+1mm
Straighness	1mm/1000mm max.					3mm/1000mm max.

Qilu steel stock hot rolled bar and forged bars more than ten thousands tons every month, below our our stock size.

1): Stock diameter for hot rolled bar

10	12	15	18	20	22	25	28	30	32	35	38	40	45	50
55	60	65	70	75	80	85	90	95	100	105	110	120	130	140
150	160	170	180	190

2) : Stock diameter for hot forged bar

200	210	220	230	240	250	260	270	280	290
300	310	320	330	340	350	360	370	380	390
400

Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.

5: Ultrasonic Test

EN10228-3 class III or Sep 1921-84 D/D

6：Steel making & Forging processing

1): Steel making process:

  EF+LF+VD

  EAF+LF+VD

  EF+LF+VD+ESR

  EAF+LF+VD+ESR

2): Forging processing:  

Put the 1.2379 ingot into the furnace and pre-heat to 700-800℃

Continue heating the ingot to initial temperature: 1000-1100℃

Forge the ingot, forging temperature should be not less than 850-900℃

Cooling in the sand after forging

7: Heat treatment

1): Annealed:

Heat 1.2379 steel to 840-880℃ in the furnace

Soak at this temperature in the furnace

Cooling in the furnace slowly

2): Quenching and tempering:

Preheat Temperature: 816℃

Heat 1.2379 steel to 1010-1030℃ in the salt bath furnace

Soak at this temperature in the furnace

Quench in air

Temper steel at 170-190℃ in the furnace

Take out from furnace and cool in the air.

Above curve in figure is just a rough guide to the tempering behaviour of steels. When applying the curves for an estimation of the hardness which can be expected in quenched and tempered tools, it should be taken into account that the optimum heat-treatment conditions for the tools are not necessarily identical with those specified for the test pieces.

The heating time of test pieces in a salt batch shall be as give in below table:

Total heating time of test pieces in a salt bath

Nature of steel	Hardening Time min	Tempering Time min
Cold or hot work steels	25 +/- 1	60
High-speed steels	3	Minimum 2 periods of 60 each

If the test pieces are not heated in a salt batch, the heating time must be extended accordingly, and the times for heating give above are not valid for thicker tools.

Application Scenarios

Cold-Work Molds & Dies

Blanking Dies: Delivers clean, precise cuts for metal sheets and strips.

Forming Dies: Ideal for cold forming and bending operations requiring dimensional accuracy.

Drawing Dies: Excels in deep drawing of metal components with consistent results.

Trimming Dies: Used for trimming and finishing processes in manufacturing.

Cutting Tools

Shear Blades: Efficiently cuts metal sheets and strips with minimal wear.

Slitting Knives: Perfect for precision slitting of thin materials and foils.

Punching Tools: Suitable for high-precision punching operations in various industries.

Wear-Resistant Components

Guide Rails: Provides smooth guidance in high-wear machinery and equipment.

Wear Plates: Protects surfaces in abrasive environments, extending equipment life.

Rollers: Used in rolling mills and high-wear machinery for reliable performance.

Precision Tools & Other Applications

Gauges and Measuring Tools: Ensures high accuracy in quality control and inspection.

Thread Rolling Dies: Ideal for thread rolling applications requiring sharp, durable edges.

Cold Extrusion Dies: Used for cold extrusion of metals into complex shapes.

High-Hardness Parts: Bearings, gears, and shafts for high-performance machinery.

FAQ

What are the equivalent grades of DIN 1.2379?

DIN 1.2379 is equivalent to AISI D2 (USA), X153CrMoV12 (ISO), JIS SKD11 (Japan), and Cr12Mo1V1 (China).

What is the hardness of DIN 1.2379 after heat treatment?

Annealed hardness is maximum HB255; cold-drawn condition reaches HB269 max; hardening and tempering results in a minimum hardness of HRC61.

What supply sizes are available for DIN 1.2379?

Supply options include hot rolled bars (Φ10-Φ190mm), hot forged bars (Φ200-Φ600mm), hot rolled plates (T:10-60mm; W:310-810mm), hot forged plates (T:70-250mm), and hot forged blocks (T:260-500mm), with lengths of 2000-5800mm. Stock is available for hot rolled and forged bars.

What ultrasonic test standards does DIN 1.2379 meet?

It complies with EN10228-3 class III or Sep 1921-84 D/D standards for ultrasonic testing.