Pre Hardened 718 Steels Suppliers

718 ( Pre-hardened )

Product Details

Product Features

  • Even hardness and high clarity;
  • Good performance in polishing, galvanic corrosion, scalding and machining;
  • Excellent machinery performance and machinability;
  • Good hardenability.

Chief Application

  • Template of large die mould and household appliances with high surface requirement;
  • Applicable to large mirror plastic mould, e.g. automobile, household appliances and audio-video product;
  • Available for plastic mould with mirror polishing requirement;
  • Suitable for injection mould and blowing mould of PA, POM, PS, PE, PP and ABS plastics;
  • Mould cavity with high polishing and high requirement.

Chemical Composition

Product 

Name

Ingredient(Wt,% )
C Si Mn P S Cr Ni Mo V
718 0.32-0.40 0.20-0.40 1.10-1.50 ≤0.015 ≤0.010 1.70-2.00 0.90-1.20 0.30-0.55 /

Specification & Hardness

  • Thickest thickness 1200mm

  • Hardness HRC31-35 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)

18~100°C 18~200°C 18 〜300°C 18~400°C 18~500°C 18 〜600°C 18 〜700°C
11.9 12.2 12.5 12.81 13.11 13.41 13.71

 

Thermal 

Conductivity 

W/m*k

20°C 100°C 200°C 300°C 400°C
36 33.4 31.4 30.1 29.3

 

Continuous Cooling Transition(CCT)Map Tempering Curve

Metallographic Structure

100mm from surface 300mm from surface Core

Heat Treatment Process

Item HeatingTemperature(°c) Cool Method Hardness
Annealing 710-740 Furnace Cold ≤220HB
Quenching 850-880 Oil Cooler or Air Cooling 48-52HRC
Tempering 560-680 Air Cooling 30-35HRC

 Microstructure