Do you choose 304 stainless steel or 3 16 stainless steel for customized stainless steel non-standard screws?

First, let's look at the difference between 304 stainless steel and 3 16 stainless steel:

I. Representation of 304 and 3 16 stainless steel materials

Generally, the spiral surface of 304 stainless steel is shown as A2, and the screw of 3 16 stainless steel is shown as A4. The national standard and German standard marks of stainless steel screws are usually indicated by A2-70 or A2-80. A2- stands for cold working of austenite, made of SUS 304,70, with minimum tensile strength of 800MPa and 80- minimum tensile strength of 800. 304 stainless steel belongs to A2, and 3 16 stainless steel belongs to A4. Their compressive strengths are 700 and 800 respectively.

Second, 304 stainless steel and 3 16 stainless steel screw material prices

At present, 3 16 stainless steel material is much more expensive than 304 stainless steel material, because the corrosion resistance of 3 16 stainless steel material is much better than 304 stainless steel material, and molybdenum metal is added to 3 16 stainless steel material, which greatly improves its heat resistance.

Other properties and strength of 3 16 and 304 stainless steels are almost the same.

So how do we choose these two materials when customizing stainless steel non-standard screws?

The customized material selection of non-standard screws is mainly based on the actual use environment and the use of screws, such as screws used outdoors or in wet places. WorldCom screw manufacturers suggest using 3 16 stainless steel screw wire with better corrosion resistance. If it is used indoors in humid places, then from the point of view of saving money and energy, 304 stainless steel screw material can be used anywhere 304 can be used.