1.2379 Cold-Work Tool Steel
High-carbon, 12 % chromium cold-work tool steel (X153CrMoV12, AISI D2). It offers very high wear resistance and edge retention, and is one of the most widely used materials for blanking, punching and cold-forming dies.
Grade and sizes
1.2379
High-carbon, 12 % chromium cold-work tool steel. Very high wear resistance and edge retention, with good dimensional stability in heat treatment.
Grade standard: EN ISO 4957
- FORM
- Round bar · flat bar / block
- SIZE
- On request; cut to the size you need
- SUPPLY CONDITION
- Soft annealed, max. 255 HB (standard condition)
- WORKING HARDNESS
- 56–62 HRC depending on the application (after hardening and tempering)
Chemical composition (%)
Ranges to EN ISO 4957; P and S max. 0.030.
| GRADE | C | Si | Mn | Cr | Mo | V |
|---|---|---|---|---|---|---|
| 1.2379 | 1.45–1.60 | 0.10–0.60 | 0.20–0.60 | 11.0–13.0 | 0.70–1.00 | 0.70–1.00 |
Heat treatment (guide values)
Compiled from steelmakers’ data sheets; actual values depend on the section size and furnace conditions.
| PROCESS | TEMPERATURE | COOLING AND RESULT |
|---|---|---|
| Soft annealing | 830–860 °C | Slow furnace cooling · max. 250 HB |
| Stress relieving | 650–700 °C | Furnace cooling |
| Hardening | 1000–1050 °C | Air, oil, hot bath at 500–550 °C or high-pressure gas quenching in vacuum |
| Tempering | 180–250 °C, at least twice | Approx. 60–62 HRC |
| Secondary-hardening route | Hardening from 1050–1080 °C, tempering at 500–525 °C | Approx. 62 HRC · suitable for nitriding and PVD coating |
Weight calculator
Calculate the weight from the size, or the length and number of pieces needed for a target weight. Your selections are added to the quote message automatically.
Size: Ø50 × 200 mm, quantity: 1 (theoretical ~3.02 kg)
Technical data
Chemical composition, mechanical properties and material certificates are available on request.
+90 530 671 13 78 · info@pointmetal.com.tr
Applications
- Blanking and punching dies (sheet up to approx. 6 mm thick)
- Fine-blanking tools
- Thread-rolling dies
- Cold-extrusion and cold-forming tools
- Deep-drawing tools
- Circular shear blades and industrial knives
- Roll-forming rolls
- Powder-pressing tools
Frequently asked questions
Is 1.2379 supplied annealed, and does it need hardening?
The standard supply condition is soft annealed (max. 255 HB), and machining is done in this condition. After machining, the tool is hardened from 1000–1050 °C and tempered; the working hardness is usually 56–62 HRC, depending on the application. A lower hardness is chosen for dies that cut thick or hard sheet.
Can 1.2379 be nitrided or coated?
Yes. If the tool is to be nitrided or PVD-coated, it is hardened from 1050–1080 °C and tempered at 500–525 °C (the secondary-hardening route), so that it does not lose hardness at the nitriding or coating temperature.
What is the difference between 1.2379 and 1.2842?
1.2379 has higher wear resistance, changes less in size during heat treatment and through-hardens in large sections, so it is preferred for long production runs. 1.2842 is an oil-hardening steel that is easier to machine and grind, suited to short and medium runs and to tools of thin and medium section.
When is 1.2379 the wrong choice?
Where impact, bending or edge chipping is the main risk, such as thick sheet, scrap shears or tools with sharp corners. Tougher grades such as 1.2767, 8 % chromium steels or powder-metallurgy cold-work steels are used instead.
Can hardened 1.2379 be wire-EDM cut?
Yes. An additional temper about 15–25 °C below the last tempering temperature is recommended afterwards. For blocks thicker than 50 mm, the secondary-hardening route (high-temperature tempering) and relief holes drilled before hardening reduce the risk of cracking.
What are the designations for 1.2379?
1.2379: X153CrMoV12, AISI ≈ D2, JIS ≈ SKD11, UNS ≈ T30402. Any of these designations can be used in your enquiry; we will match the correct material.
Why can the invoiced weight differ from the calculated weight?
The calculator gives the theoretical weight. The actual weight varies with dimensional tolerances and cutting allowance; we invoice on the actual weight as weighed.
What information should I send for a quote?
We only need the size (diameter × length), quantity and delivery location. If you fill in the calculator above, these details are added to the WhatsApp message automatically.