DIN 1.2311 Plastic Mold Tool Steel | P20
DIN 1.2311 steel is a low alloyed steel with at least 1.8% Cr ,0.15%Mo as per DIN/EN standard.As plastic mold tool steel, it is mostly used in the quenched and tempered condition, with a hardness of 285-320HBW. After quenching and tempering, DIN 1.2311 steel has good toughness,wear resistance and good machinability.
Typical application for DIN 1.2311 steel are:For large injection and compression molds, Blow molds,die holder, backers and Structural components, shafts,etc.
DIN 1.2311 Steel Chemical Composition
| Standard | Grade | C | Si | Mn | P | S | Cr | Mo |
| DIN ISO 4957 | 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 |
| ASTM A681 | 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 |
| GB/T 1299 | 3Cr2Mo | 0.28-0.4 | 0.2-0.8 | 0.6-1.0 | 0.03 | 0.03 | 1.4-2.0 | 0.3-0.55 |
DIN 1.2311 Steel Related Specifications
ASTM:P20
DIN:40CrMnMo7
AFNOR:40CMD8
GB:3Cr2Mo
DIN 1.2311 Steel Heat Treatment & Mechanical Property
DIN 1.2311 Steel Annealing
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
DIN 1.2311 Steel Quenching
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
DIN 1.2311 Steel Tempering
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 |
DIN 1.2311 Steel Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.Ultrasonic test report
DIN 1.2311 Steel Supply Form & Size &Surface Finish&Tolerance
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1,000 | 3,000-10,000 |
| Square bar | 100x100-600x600 | 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 |
| 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 |
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
