P20 Steels Manufacturers

P20 ( Pre-hardened )

Product Details

Product Features

  • Possess good machinability and mirror ultrafinish performance; 
  • Dimensional stability;
  • Good tenacity and good machining performance.
  • Chief Application
  • Thermoplastic plastic injection mould, extrusion die;
  • Thermoplastic plastic blowing mould;
  • Main parts of overloading mould;
  • Cold structural parts;
  • Commonly used in manufacturing TV shell, washing machine, inner shell of refrigerator and bucket, etc;
  • Bumper mould

Chemical Composition

Product 

Name

Ingredient(Wt,% )
C Si Mn P S Cr Ni Mo V
P20 0.32-0.38 0.20-0.40 0.70-1.00 ≤0.025 ≤0.020 1.60-2.00 / 0.30-0.55 /

Specification & Hardness

  • Thickest thickness 900mm;
  • Hardness HRC29-33 or based on customers’ requirement
  • Ultrasonic Flaw Detection
  • Conform to primary flaw detection of international standard GB/T6402-91 I degree.

Physical Properties

Thermal 

Expansion 

Coefficient 

10-6m(m*k)

20~1 00°C 20~200°C 20 〜300°C 20~400°C 20~500°C 20 〜600°C 20 〜700°C
11.1 12.9 13.4 13.8 14.2 14.6 14.9

 

Thermal Conductivity  W/m*k 20°C 350°C 700°C
35.7 33.6 32

Forging

  • Temperature1200°C
  • Heat Treatment Process
Item HeatingTemperature(°c) Cool Method Hardness
Annealing 710-740 Furnace Cold ≤220HB
Quenching 840-880 Oil Cooler 52-55HRC
Tempering 580-680 Air Cooling 30-35HRC
Continuous Cooling Transition (CCT)Map Tempering Curve

Steel Display