Pre Hardened Plastic Die 718 Steel Manufacturers, Suppliers

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,% )

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

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