Steel structure bolt in use will be different according to the strength of the different use of the place is also different, so how to judge the strength grade?
Steel structure bolts strength grade:
The strength grade of steel structure bolt for steel structure connection is 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. The strength grade of steel structure bolt consists of two parts of numbers, which respectively represent the nominal tensile strength value and flexion ratio of steel structure bolt material.
For example, steel structural bolts of grade 4.6. The meaning is:
1, steel structure bolt material nominal yield strength of 400×0.6=240MPa grade performance grade 10.9 high strength steel structure bolt.
2. The compressive strength ratio of steel structure bolt material is 0.6;
3, steel structure bolt material nominal tensile strength up to 400MPa;
After heat treatment, the material can achieve:
1, steel structure bolt material nominal yield strength of 1000×0.9=900MPa grade
2. The ratio of buckling strength of steel structure bolt is 0.9;
3, steel structure bolt material nominal tensile strength of 1000MPa;
The meaning of steel structure bolt intensity grade is the international standard, the steel structure bolt of same performance grade, no matter its material and the distinction of producing area, its performance is same, choose performance grade only on the design can.
The strength grades 8.8 and 10.9 refer to the shear stress grades of steel structural bolts 8.8GPa and 10.9 GPa
8.8 Nominal tensile strength 800N/MM2 Nominal yield strength 640N/MM2
General steel structure bolt is denoted by “X.Y”,X*100= the tensile strength of the steel structure bolt,X*100*(Y/10)= the yield strength of the steel structure bolt (as stipulated in the label: yield strength/tensile strength =Y/10), such as 4.8, the tensile strength of the steel structure bolt is :400MPa , yield strength :400*8/10=320MPa.
The above is the strength grade of steel structure bolt, we are in use according to the different grade to use, in the building used is generally high strength grade bolt.
Post time: Oct-30-2021