Spiral seamless steel pipe specifications and appearance quality (1) Specifications: Spiral seamless steel pipe specifications should be specified in the import and export trade contract. Should generally include standard grades (categories code), nominal diameter of steel bars, nominal weight (mass), the specified length and the allowable difference of the above indicators. China's standard recommended nominal diameter of 8,10,12,16,20,40mm spiral seamless steel pipe series. The length of supply is divided into two types, length and size. China's export rebar length selection range of 6 ~ 12m, Japan rebar length range of 3.5 ~ 10m.
(2) Appearance quality: 1 Surface quality. The relevant standards stipulate the surface quality of the rebar, requiring that the end should be cut straight, the surface must not have cracks, scabs and folds, there must be no harmful defects in use, etc.; The requirements for bending and reinforcing bar geometry of rebar are specified in the relevant standards. As stipulated in our country's standards, the straight bar reinforcement has a bending of no more than 6mm/m, and the total bending no more than 0.6% of the total bar length.
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