Performance level firmware standard

(1) The boron content is too high, which is disadvantageous for products requiring good comprehensive mechanical properties such as bolts, screws and studs. Moreover, in the current relevant technical standards for steel products, there is a lack of restrictions on boron. Therefore, this standard is necessary to limit the composition of boron. Note: due to GB/T3098. 1-20

(1) The boron content is too high, which is disadvantageous for products requiring good comprehensive mechanical properties such as bolts, screws and studs. Moreover, in the current relevant technical standards for steel products, there is a lack of restrictions on boron. Therefore, this standard is necessary to limit the composition of boron. Note: Because GB/T3098.1-2000 standards use mechanical property terms, this article is the unification of the narrative, the whole article uses the term mechanical properties.

(2) The new standard modifies the phosphorus and sulfur content of fastener materials above 8.8 strength, so that the content of harmful elements such as phosphorus and sulfur is changed from 0.04% and 0.05% respectively to the same value of 01035%. It is consistent with the current technical requirements for steel 1 (GB/T699-1999 and GB/T3077-1999).

(3) New and old standards have the minimum tempering temperature regulation for 8.8 grade fastener products. The new and old standard minimum tempering temperature is compared with the performance standard grade material minimum tempering temperature old standard new standard.

The new standard adds four technical indicators of breaking torque, reduction of area, hardness after tempering and surface defects in the mechanical and physical properties of fasteners specified.

The new standard adds provisions for the maximum value of the end hardness measurement. According to the provisions of this standard, the hardness of bolts, screws and studs is measured at the head, end or rod. When the end is selected for measurement, the maximum hardness should be 250HV, 238HB or 99.5HRB. This is the old standard. No.

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