A Brief Discussion On The Classification And Identification Of Stainless Steel And Carbon Steel Bolts

The grades of Cable Lugs are divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9. The numbers before and after the decimal point represent the nominal tensile strength and yield strength ratio of the bolt material. For example, a bolt marked with grade 8.8 indicates that the tensile strength of the material reaches 800MPa, and the yield strength ratio is 0.8, that is, its yield strength reaches 800X0.8=640MPa;
The grades of stainless steel bolts are divided into 45, 50, 60, 70, and 80. The materials are mainly divided into austenite A1, A2, and A4, martensite and ferrite C1, C2, and C4. For example, A2-70, the numbers before and after "--" represent the bolt material and strength grade.
Commonly used materials for bolts: Q215, Q235, 25 and 45 steel. For important or special-purpose threaded connections, alloy steels with high mechanical properties such as 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMrSi can be selected.
Allowable stress The allowable stress of threaded connections is related to factors such as load properties (static and variable loads), whether the connection is tightened, whether the preload needs to be controlled, and the material and structural dimensions of the threaded connections.
Based on the above standard conditions, we can understand the grade identification of stainless steel and carbon steel bolts. You can understand the specific application of each bolt based on its grade and performance. Our company specializes in the sale of bolts and other products. If you have any needs, you are welcome to come to our company to purchase at any time.