Chinese National Standard GB/T 5067-1993 Cold-rolled strip for bicycles
Cold-rolled strip for bicycles is the basic material for making various parts of bicycles such as brake arms, seat posts, handlebars, and bolts, and a high-quality material is needed to guarantee the performance, riding comfort and safety of the bicycle.
GB/T 5067-1993 stipulates the standard requirements, test methods and inspection rules for cold-rolled strip for bicycles, including material classification, size, shape, weight, technical requirements, test methods and inspection rules, as well as packaging and labels.
GB/T 5067-1993 Cold-rolled strip for bicycles is divided into A-level and B-level according to its mechanical properties. The main requirements for A-level cold-rolled strip for bicycles are as follows.
1. Chemical composition: carbon C not more than 0.45%, silicon Si not more than 0.30%, manganese Mn not more than 1.00%, phosphorus P not more than 0.040%, sulfur S not more than 0.050%, aluminum Al not more than 0.20%, residual elements not more than 0.10%, and balancing steel.
2. Length and straightness: it should reach standard requirements after cutting into the specified length.
3. Surface quality: no oil stains, no defects, no peeling, no cracks, no folds, no separation, no wear, no burrs, no pits, no sandholes, no rust, and no slag.
4. Mechanical properties: tensile strength should not be less than 640MPa, yield strength should not be less than 545MPa, elongation should not be less than 18%, and section reduction area should not be less than 30%.
GB/T 5067-1993 Cold-rolled strip for bicycles can be widely used in the production of various parts of bicycles, such as brake arms, headlights, crank axes, seat posts, handlebars and wheels. Adopting the GB/T 5067-1993 standard production of cold-rolled strip for bicycles has the advantages of uniform material properties, stable product quality, and beautiful appearance. It plays an important role in ensuring product performance, riding comfort and safety. It is widely used in bicycle frames, bicycle parts, bicycle accessories and other related fields.
