What Is The Surface Finish Of ISO 42CrMo4 Steel

42CrMo4 steel is a common high-quality alloy structural steel with advantages such as high strength, high toughness and easy processing, and the market demand is relatively large. Recently, Songshun received a large procurement inquiry from a customer in Brazil. He needs to purchase 42CrMo4 alloy steel and asked us whether we can confirm that its surface finish can reach 0.2. Of course, we can confirm that it can reach it. Because the surface finish of ISO 42CrMo4 steel can be achieved through different machining and surface treatment methods to meet different requirements. This article will show you how Songshun uses several different methods to make 42CrMo4 materials achieve different surface finishes to meet different needs.

What Is Surface Finish
The surface finish of steel refers to the degree of flatness and smoothness achieved by the steel after different processing or surface treatment. It is usually expressed in microns (Ra value) of the arithmetic mean deviation of the profile, which is completed by measuring instruments to ensure that the processing quality meets the standard requirements. In practical applications, the surface finish of ISO 42CrMo4 steel is an important indicator to measure the surface quality of steel, and it usually depends on the purpose and requirements of its final product. For example, the surface of steel used for precision mechanical parts may need to achieve an extremely smooth surface of Ra 0.1 – 0.2 µm; Ra values ​​between 0.2 and 0.4 µm are higher finish standards, usually suitable for applications with higher requirements; and some heavy industrial parts may only need to achieve a rough surface of Ra 1.2 microns or more. Generally speaking, the surface finish of 42CrMo4 steel provided by Songshun can reach the following levels:

The above are just some of the surface finishes corresponding to the machining methods. It can be seen that grinding can achieve a higher surface finish, which is suitable for the machining of parts that require precision matching; while drilling is suitable for the machining of general industrial parts with lower requirements for surface roughness. It should be noted that the actual surface finish of 42CrMo4 alloy structural steel depends on the accuracy of the machining process, the process and the cutting tools used, and the specific parameters are based on the actual machining situation.

Surface Treatment
Similarly, different surface finish effects can be achieved through different surface treatment technologies for ISO 42CrMo4 steel.

The above data are only general data. In fact, there is no fixed value for the surface finish that can be achieved by ISO 42CrMo4 steel after different surface treatment technologies. It depends on the combined influence of many factors. But usually, if high-quality precision mechanical parts are required, mechanical polishing or chemical polishing may be selected, while for some rough-machined industrial parts, sandblasting or shot peening may be sufficient to achieve the surface roughness requirements.

In summary, Songshun can meet the specific requirements of different customers for the surface finish of ISO 42CrMo4 steel, and can also provide various DIN 42CrMo4 steel processing and surface treatment technologies to meet customers’ different application scenarios and needs.