DIN 1.2311 TOOL STEEL |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.

DIN 1.2311Steel | 40CrMnMo7 | P20 Round bar

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 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

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

Quenching Details
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 quenchedDIN 1.2311 Quenching Diagram

DIN 1.2311 Quenching Diagram

Tempering Details
1.Temper temperature:500-600℃
2.Air cooling.DIN 1.2311 Tempering Diagram

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

Annealing Details
1.Annealing temperature:800-820℃
2.Enough soaking time for the steel heating
3.Cooling in the furnace.
4.Max hardness:229HBDIN 1.2311 Annealing Diagram

DIN 1.2311 Annealing Diagram