3Cr2Mo is a steel grade converted from P20 of AISI specification in the United States, and the only plastic mold steel formally included in the standard GB/T 1299-85 (Technical Conditions for Alloy Tool Steels). It is universal pre-hardened plastic mold steel, widely used in various countries. Mechanical processing can be made after quenching and tempering.
Chemical properties of 3Cr2Mo Steel
|
Steel Grade
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
|
3Cr2Mo
|
0.28-0.40
|
0.20-0.80
|
0.60-1.00
|
≤0.030
|
≤0.030
|
1.40-2.00
|
0.30-0.55
|
Features of 3Cr2Mo Steel
The steel has good hardenability and certain toughness.
Carburization can be made, and the surface hardness reaches 65HRC after carburizing and quenching.
The steel has high thermal hardness and wears resistance.
It can be directly polished and assembled after processed into shape because pre-hardened treatment has been made in the delivery state.
Application of 3Cr2Mo Steel
It can be used to make large injection molds or extrusion molds instead of traditional #45 steel.
The steel is suitable for making large plastic molds such as cabinets of TV and large recorders, and panel covers of washing machines. Its processing and polishing performance are significantly better than that of #45 steel. Under the same polishing conditions, its surface roughness is lower than that of #45 steel 1 ~3 levels.
Suitable for compression molds.
Suitable for corrosion-resistant, high-precision molds.
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