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1.2738 P20 40CrMnNiMo8-6-4 2738 Plastic Mould Steel Plate

Group Plastic Mould Steel Plate
Min. Order 1 piece
Terms of Payment L/C, D/A, T/T
Update Time 2019-06-12
Item specifics
Surface conditionBlack, Machined
Delivery conditonHot rolled, Cold rolled

Introduction:

1.2738 Pre-hardened Plastic Mould Steel, hardness in as-delivered condition 280 to 325 HB. Good machinability, suitable for texturing, improved through hardening in comparison to 1.2311, good polishability.

Applications:

Large plastic moulds with deep engravings and intensive impacts on the core. 1.2738 Pre-hardened Plastic Mold Steel is the logical development of 1.2311, a pre-hardened plastic mould steel for use in large moulds, which also have to display high core strength. The additional nickel content of 1 % increases through hardening. 1.2738 is a micro-alloyed, vacuum-degassed steel with the following excellent features: good machinability, outstanding polishability, good texturing properties.

Chemical Composition(%):

Grade

C

Si

Mn

p

S

Cr

Ni

Mo

1.2738

0.35-0.45

0.20-0.40

1.30-1.60

0.030 max

0.030 max

1.80-2.10

0.90-1.20

0.15-0.25

Product Details:

Quality Standard: GB, ASTM

Similar Grade: 1.2738 P20+Ni 718

Size Range:Thickness1-3.5mm   Width:800mm 

Surface Condition: Bright

Delivery condition: Cold rolled only

Heat Treatment :

Annealing: Annealing temperature: 710 ~ 740 °C, holding time is decided by the thickness of the DIN 1.2738 die steel, one hour per 25mm. Colding in furnace after thermal insulation.


Destressing: Heating temperature: 600 °C (annealed condition), 550 °C (quenching and tempering state), holding time is decided by the thickness of the 1.2738 steel, one hour per 50mm. Colding infurnace after thermal insulation.


Quenching and tempering:
Preheating temperature 500 ~ 600 °C, quenching temperature 840 ~ 880 °C, holding 30min (the mold have to quenching in the protective gas to prevent oxidation and decarbonization). Oil cooling, cooling to 50 ~ 70 °C,immediately tempered. Tempering holding time is decided by the thickness of the 1.2738 steel mould, one hour per 25mm, at least 2h. Tempering temperature: 180 °C / 200 °C / 300 °C / 400 °C / 500 °C / 600 °C, the hardness: 52HRC / 51HRC / 48 HRC / 46HRC / 42HRC / 34HRC.