1, iron body stainless steel material

First of all, the stainless steel of model 430 belongs to ordinary chromium steel. Its corrosion resistance and heat resistance are better than the screw of model 410, and it is more magnetic, but it cannot be strengthened by heat treatment. Therefore, the stainless steel of model 430 is very suitable for high corrosion resistance and heat resistance, and its hardness is not very good.

2, martensitic stainless steel

The stainless steel material of 410 models and 416 models on the market can be strengthened by heat treatment. After heat treatment is strengthened, the hardness of stainless steel screws is generally in 32 to 45HRC, and the machinability of the stainless steel is also better. The sulfur content of the stainless steel material of 416 models is very high, and it belongs to the hardware accessories that are easy to cut and easy to cut.

3. Austenitic stainless steel

Our most common screw names and models are 302,303,304 and 305. The so-called 18-8 austenitic stainless steel generally has these four models. Both corrosion resistance and mechanical are very similar, using the way of its manufacturing process of stainless steel screws are not completely the same, and USES the way of determine its specifications and shapes of stainless steel screws, as well as to determine the number, for it made of stainless steel screws if improved after heat treatment, its strength level can reach 4.7 magnitude.