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Plastic mold steel is a pearlitic steel grade based on Cr-Ni-Mo, and it is also one of the important materials in the mold manufacturing industry. Among them, 1.2311, 1.2312 and 1.2738 steel are the most commonly used materials. Although they are all plastic mold steels, there are certain differences. This article will discuss the differences between 1.2311, 1.2312, and 1.2738 plastic mold steel from several aspects, so as to help more customers buy suitable steel and better apply it to projects.
1.2311 steel is a high strength pre-hardened steel with low carbon content, also widely known as P20. Its chemical composition is as follows:
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) |
|---|---|---|---|---|---|---|---|---|
| 1.2311 | 0.35-0.45 | 0.20-0.40 | 1.30-1.60 | ≤0.030 | ≤0.030 | 1.80-2.10 | 0.15-0.25 | - |
Compared with other plastic mold steels, 1.2312 steel is the steel with the highest sulfur content, and is also widely known as P20+S steel. Its chemical composition is as follows:
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) |
|---|---|---|---|---|---|---|---|---|
| 1.2312 | 0.35-0.45 | 0.30-0.50 | 1.40-1.60 | ≤0.030 | 0.05-0.10 | 1.80-2.00 | 0.15-0.25 | - |
1.2738 steel is an upgraded material based on 1.2311 with nickel added, and is also widely known as P20+Ni steel. Its chemical composition is as follows:
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) |
|---|---|---|---|---|---|---|---|---|
| 1.2738 | 0.35-0.45 | 0.20-0.40 | 1.30-1.60 | ≤0.030 | ≤0.030 | 1.80-2.10 | 0.15-0.25 | 0.90-1.20 |
From the chemical composition of the above three steels, it can be seen that 1.2312 steel is significantly different from the other two steels in terms of silicon and sulfur elements; 1.2311 steel is similar to 1.2738 steel in chemical composition, only the nickel element is different.
The difference in chemical composition of 1.2311 vs 1.2312 vs 1.2738 plastic mold steel has a key impact on its performance, so there is a little difference in performance among the three.
(1) 1.2311 steel is usually used to make small and medium-sized molds.
(2) 1.2312 steel is suitable for the manufacture of molds with complex shapes, high precision and cutting performance requirements, especially parts that require complex processing.
(3) 1.2738 steel is used to manufacture large-scale, complex and high-load molds that resist impact, extrusion, wear, etc., and is especially suitable for the manufacture of molds that are required to be used at higher temperatures.
In terms of chemical composition, performance and application, 1.2311, 1.2312 and 1.2738 plastic mold steels have unique advantages and differences. In addition to the differences in these aspects, there are also differences in the production process. So if you want to buy plastic mold steel, understanding the differences between them can allow you to make the best choice and find the most suitable steel.
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