A4-70 Stainless Steel Hex metal bolts M20 High Strength and Durability for Extreme Environments

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Applications

Stainless steel bolts grade, A2 and A4 represent different material classification, A2 means austenitic steel group II, usually use 304 stainless steel material, A4 represents 316L stainless steel. Here, ‘50’ and ‘70’ represent the performance level of the product, specifically 1/10 of the nominal tensile strength, for example, A2-70 means that the tensile strength is 700MPa.

In the classification of stainless steel, A1 to A5 groups are different according to the different chemical compositions, and this information can be found in Appendix B of GB/T3098.6-2000 standard.

It is worth noting that A2-70 represents austenitic steel, which is cold worked and has a minimum tensile strength of 700 MPa. this material is widely used in the chemical industry, food processing, and medical equipment due to its good corrosion resistance and formability.

A4-70 stands for 316L stainless steel, which is also cold-worked and has excellent corrosion resistance, especially in environments containing chloride ions. This material is commonly used in the manufacture of seawater treatment equipment, ships and medical devices.

In contrast, A2-50 and A4-50 represent lower tensile strength austenitic steel and 316L stainless steel, which have tensile strengths of 500 MPa and 500 MPa, respectively. despite their lower strengths, they still have irreplaceable advantages in certain specific applications, such as decorative parts and light structural parts.

In summary, the differences between A2-70, A4-70, A2-50 and A4-50 stainless steel bolts are mainly reflected in the tensile strength, type of material and applicable scenarios, and the selection of the right type of stainless steel bolts is essential to ensure the safety and reliability of mechanical equipment.

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