Plastic product use the increased manifold. This has resulted in similar increase in use of steels for making plastic moulds. Plastic mould steel is mainly used in pre-hardened condition, which enables the customer to directly use the steel by only die cutting it. The particular advantages of this grade of steel is that it saves hardenign after machining and can be used for very large dimensions in as-supplied condition.
The growing demands on shape, function, surface finish, decorativeness, aestheties and all-round product quality require the plastic mould and the steel it is made of to be of top quality. Therefore, manufacturers of plastic products need dies with a long operation period that will retain their high standard quality on a continuous basis.
Moulds made of these steels also offer very good repair weldability, they require only little maintenance and upkeep, while the properties remain the same throughout the entire service life of the mould. For all, this means high service life quantities and low mould costs per unit.
EQUIVALENT GRADES
|
AMERICAN (AISI) |
(W.Nr) |
German (DIN) |
Bohler |
Assab |
|
P-20 |
1.2311 |
40CrMnM07 |
W330 |
718 |
|
P-20+S |
1.2312 |
40CrMnMoS8-6 |
M200 |
HOLDAX |
|
P-20+Ni |
1.2738 |
40CrMnNiMo8-6-4 |
|
IMPAX |
CHEMICAL COMPOSITION
|
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
W |
|
1.2311 |
0.35-0.45 |
0.20-0.040 |
1.30-1.60 |
0.035 max |
0.035 max |
1.80-2.10 |
0.15-0.25 |
|
|
|
1.2312 |
0.35-0.45 |
0.30-0.050 |
1.40-1.60 |
0.030 max |
0.05-0.10 |
1.80-2.10 |
0.15-0.25 |
|
|
|
1.2738 |
0.35-0.45 |
0.20-0.40 |
1.30-1.60 |
0.035 max |
0.035 max |
1.80- |
0.15- |
0.90- |
|