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