DIN 1.2311Steel |40CrMnMo7 | P20 Round bar
DIN 1.2311 Tool Steel is a low alloyed steel with 2.0% Cr ,0.15%Mo as per DIN standard.As plastic mold tool steel, it has good toughness,wear resistance after Nitriding. It is mostly used in the hardened and tempered condition with hardness 285-320 HBW.Typical application for this steel are:For large injection and compression molds, Blow molds,die holder, backers and Structural components, shafts,etc.
1.DIN 1.2311 steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1,000 | 3,000-10,000 |
| Square bar | 100×100-600×600 | 3,000-6,000 |
| Plate/Sheet | Thickness :20-400 Width:80-1,000 |
2,000-6,000 |
| Flat bar/Blcoks | Thickness :120-800 Width:120-1,500 |
2,000-6,000 |
2.Surface Finish&Tolerance
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
3.Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 1.2311 | 0.35-0.45 | 0.2-0.4 | 1.3-1.6 | ≤ 0.03 | ≤ 0.03 | 1.8-2.1 | 0.15-0.25 |
| P20 | 0.28-0.4 | 0.2-0.8 | 0.6-1.0 | ≤ 0.03 | ≤ 0.03 | 1.4-2.0 | 0.3-0.55 |
4.Related Specifications
ASTM:P20
DIN:40CrMnMo7
AFNOR:40CMD8
GB:3Cr2Mo
5.Heat Treatment & Mechanical Property
1.Quench temperature:840-870℃
2.Three steps for heating,hold suitable time for the steel to be thoroughly heated.
3.Oil or water quench.
4.Tempering immediately after quenched
DIN 1.2311 Quenching Diagram
1.Temper temperature:500-600℃
2.Air cooling.
DIN 1.2311 Tempering Diagram
DIN 1.2311 Mechanical Property With Quenching and Tempering condition
| Size mm | Tensile,Mpa | Yield,Mpa | Charpy Impact,J | Hardness,HB |
| 355*500 | 1000 | 900 | 20 | 290-327 |
| 400*450 | 1100 | 910 | 25 | 302-330 |
| 500*1000 | 1100 | 935 | 24 | 292-330 |
DIN 1.2311 Hardness Vs Tempering temperature
| Tempering Temperature,℃ | 200 | 300 | 400 | 500 | 600 | 700 |
| Hardness,HRC | 50 | 48 | 46 | 42 | 36 | 28 |
1.Annealing temperature:800-820℃
2.Enough soaking time for the steel heating
3.Cooling in the furnace.
4.Max hardness:229HB
DIN 1.2311 Annealing Diagram
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