Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI P-20 1.231140CrMnMo7---

Chemical Composition (AISI P-20)

  C Si Mn P S Cr Mo V W Co Ni


Plastic mould steel that is usually supplied in a quenched and tempered condition. Good machinability, better polishability, compared to 1.2312 (AISI P20+S). DIN 2311 is the Pre Hardened Plastic mould steel hardness distributed evenly in large cross sections that have excellent weldability with least hardness elevation, good mirror polishability and less streak texture making finishing easier. Size Section availability upto 355mm thickness. Supply hardness is 30 to 34 HRC.


Plastic mould steel equivalent to DIN 2311 is used for 

  1. die holders 
  2. zinc die 
  3. casting dies 
  4. backers 
  5. bolsters 
  6. injection moulds 
  7. mould frames for plastic moulds
  8. Shoe Blocks
  9. pressure casting moulds
  10. recipient sleeves

Heat Treatment

Soft Annealing                       Temperature                        Cooling                          Hardness

                                                     710-740C                           Furnace                       Max. 235 HB


Stress Relief  Annealing        Temperature                        Cooling

                                                    500-550C                            Furnace


Hardening                               Temperature                         Cooling                            Tempering

                                                    830-870C                       Oil or Hot bath                    See diagrams


Tempreing Curve: