Corten Steel Plate
Atmospheric corrosion resistant plate that builds its own protective rust instead of paint
Specifications
Alloy Steel Sheet
1.2379 X153CrMoV12 Cold Work Die Steel
Vanadium and molybdenum alloyed cold work die steel with stable size after hardening
1.2379 is a high carbon high chromium cold work die steel supplied for blanking and forming dies, forming rolls, press tools, punches, bits and bushes. It is specified by toolrooms and press shops that need wear resistance and dimensional stability from the same block, and it carries the equivalent callouts Cr12Mo1V1, D2, SKD11, X153CrMoV12 and X12M. Spheroidization annealing leaves the block soft enough to cut cleanly, so a die can be machined in the annealed state and then hardened without the size moving far enough to scrap the work. Thickness runs from 0-1000mm with the block cut to your size.
- Product Name — 1.2379 Mold Steel
- Grade — 1.2379 Cr12Mo1V1 D2 SKD11 X153CrMoV12 X12M sk10
- Steel Type — Cold work die steel
- Thickness — 0-1000mm
- Size — Customized size
Why It Is Specified
Key Benefits of 1.2379 Mold Steel
Wear Resistance From Vanadium and Molybdenum
The steel contains vanadium and molybdenum, which is where its wear resistance comes from. After heat treatment it reaches high hardness and holds a cutting edge against sheet metal.
Machinable in the Annealed Condition
Spheroidization annealing softening treatment gives good cutting performance, so a complex die can be cut in the soft state rather than ground from hardened stock.
Stable Size Through Hardening
As a cold work die steel it is characterized by strong hardenability and stable size, so a die that is machined close to finish stays close to finish after heat treatment.
Vacuum Degassed for a Cleaner Structure
Vacuum degassing refining treatment makes the steel purer, which matters where a cutting edge has to survive millions of strokes without chipping at an inclusion.
Thermal Stability and Fatigue Resistance
High thermal stability and thermal fatigue resistance are stated advantages of the grade, along with high temperature strength and good toughness.
One Material Against Five Drawing Callouts
Cr12Mo1V1, D2, SKD11, X153CrMoV12 and X12M all describe this steel, so a die drawing from any market can be quoted without a substitution request.
Problems It Solves
What This Material Removes From Your Process
Dies Moving Out of Tolerance After Hardening
Size change in heat treatment turns a finished die into a rework job. This grade is characterized by stable size, which is a large part of why it is chosen for close tolerance blanking work.
Cutting Edges Chipping at Inclusions
An inclusion at a working edge becomes the start of a chip after a few thousand strokes. Vacuum degassing refining treatment makes the steel purer and reduces that starting point.
Hard Stock That Is Slow to Machine
Cutting a complex die out of hardened stock costs grinding hours. Spheroidization annealing gives good cutting performance so the profile is machined soft and hardened afterwards.
Short Intervals Between Die Regrinds
Wear resistance from the vanadium and molybdenum content stretches the run between regrinds on the same press job compared with a softer die steel.
Buying Full Plates for Small Inserts
Blocks are cut to the ordered size across the 0-1000mm thickness range, so you pay for the insert blank rather than the plate it came from.
Application Scenarios
Where It Is Used
Blanking and Forming Dies
The main duty of the grade, where the cutting edge has to hold clearance against sheet steel stroke after stroke.
Press Tools and Die Sets
Press tooling for stamping lines where wear on the working face decides how often the tool comes out for regrinding.
Punches Bits and Bushes
Small hardened working parts that see high contact stress and have to keep their diameter in service.
Forming Rolls
Roll forming tooling where the profile face is worn continuously by strip passing across it.
Trim and Piercing Tooling
Trim steels and piercing inserts cut from thick blocks where the same wear and stability behaviour is needed.
Who It Is For
Buyers Who Specify This Product
- Toolroom buyers sourcing blocks for blanking and forming die inserts
- Stamping plant maintenance engineers replacing worn punches bits and bushes
- Roll forming equipment builders buying stock for profile rolls
- CNC machining shops cutting dies in the annealed condition before heat treatment
- Tooling engineers matching drawings written to D2 SKD11 Cr12Mo1V1 or X153CrMoV12
- Distributors holding cold work die steel for regional press shops
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | 1.2379 Mold Steel |
|---|---|
| Grade | 1.2379 Cr12Mo1V1 D2 SKD11 X153CrMoV12 X12M sk10 |
| Steel Type | Cold work die steel |
| Thickness | 0-1000mm |
| Size | Customized size |
| Technique | Annealed quenched and tempered |
| Surface | Raw material milling grinding |
| Application | Blanking and forming dies forming rolls press tools punches bits and bushes |
| Processing Service | Bending welding decoiling cutting punching |
| Place of Origin | China |
| Sample | Available |
| Certificate | Mill test certificate |
Technical Features
- Grades 1.2379 Cr12Mo1V1 D2 SKD11 X153CrMoV12 X12M and sk10
- High carbon high chromium cold work die steel
- Thickness 0-1000mm with customized size
- Delivered annealed or quenched and tempered
- Spheroidization annealing softening treatment for machinability
- Vacuum degassing refining treatment for steel cleanliness
- Surface as raw material milled or ground
- Processing available for bending welding decoiling cutting and punching
Materials
- High carbon high chromium cold work die steel containing vanadium and molybdenum
- Vacuum degassed refined steel supplied as 1.2379 and X153CrMoV12
- Equivalent Asian and American designations SKD11 D2 and X12M
Certification
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Steelmaking with vacuum degassing refining treatment
Hot rolling and forging to block section
Spheroidization annealing softening treatment for machinability
Quenching and tempering where the quenched and tempered condition is ordered
Surface finishing as raw material milled or ground
Cutting blocks to the ordered size
Packing and marking for export
Quality Control
Checks Before It Ships
- Delivery condition verified as annealed or quenched and tempered
- Block thickness and size checked against the cutting list
- Surface finish confirmed as raw material milled or ground
- Grade identity carried on the block marking through processing
- Mill test certificate issued for the ordered grade
Customization
What We Can Change on Your Order
- Blocks cut to size from the 0-1000mm thickness range
- Annealed or quenched and tempered delivery condition on request
- Surface released as raw material milled or ground
- Grade quoted under D2 SKD11 Cr12Mo1V1 X153CrMoV12 or X12M to suit your drawing
- Cutting punching and welding handled before shipment
- Samples available for machining and hardening trials
Comparison
1.2379 Mold Steel Against the Alternatives
| Pre-hardened plastic mold steel | 1.2379 is a cold work die steel for blanking and forming rather than a pre-hardened plastic mold grade, and is hardened after machining to reach its working hardness. |
|---|---|
| Oil hardening tool steel such as O1 | The vanadium and molybdenum content gives higher wear resistance and the grade is specified where strong hardenability and stable size are needed on larger dies. |
| High speed steel for punches | Cold work die steel is the normal choice for blanking and forming tooling at press temperatures, where high speed steel is aimed at cutting tools running hot. |
| Hardfaced mild steel tooling | A solid 1.2379 block hardens through to a uniform structure instead of relying on a deposited layer that has to be reapplied when it wears through. |
Use Guide
Specifying Handling and Welding Notes
- Machine the die in the annealed condition and harden afterwards to take advantage of the spheroidize annealed cutting performance
- Allow for the stable but not zero size change of a cold work die steel when setting pre-hardening stock allowances
- Check whether your drawing calls D2 SKD11 Cr12Mo1V1 X153CrMoV12 or X12M before placing the order since all are supplied here
- Order milled or ground blanks where the machining datum matters more than the raw rolled face
- Store blocks dry and protect machined faces because a rust pit on a working edge becomes a defect in the pressed part
- Ask for the mill test certificate so the grade and delivery condition are recorded in the tooling file
Questions Buyers Ask
1.2379 Mold Steel FAQ
Is 1.2379 the same as D2 and SKD11?
Yes. This material is supplied under 1.2379, Cr12Mo1V1, D2, SKD11, X153CrMoV12 and X12M. Quote the designation on your drawing and we will supply against it.
What thickness of block can you cut?
Thickness covers 0-1000mm and size is customized, so insert blanks can be cut to your list rather than shipped as full plate.
Is the steel machinable as delivered?
After spheroidization annealing softening treatment it has good cutting performance, which is why dies are normally cut in the annealed condition and hardened afterwards.
Why does this grade hold size through heat treatment?
As a cold work die steel it is characterized by strong hardenability and stable size, which is the reason it is used for close tolerance blanking and forming dies.
What makes the steel clean enough for a cutting edge?
Vacuum degassing refining treatment is used to make the steel purer, reducing the inclusions where a working edge would start to chip.
Do you supply it quenched and tempered or annealed?
Both conditions are available. State which one your toolroom wants and it will be confirmed on the order and on the certificate.
Can we get a test piece before ordering a full set of die blocks?
Samples are available. Send the section size you want to machine and harden in your own shop and we will confirm what can be released.
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