This Standard specifies the classification and codes, ordering content, dimensions, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certification of high-carbon chromium bearing steels.

This Standard specifies the category, code, order content, dimension, shape, mass, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless steel tubes for low-temperature-service piping.

This Standard specifies the type and dimension, technical conditions and markings of unchamfered hexagon thin nuts.

This standard specifies the classification and code, ordering content, size, shape, weight and allowable deviations, technical requirements, test methods, inspection rules, marking, packaging and quality certificates of the steel pipes with a longitudinal electric (resistance) weld.

This Standard specifies type sizes, technical conditions and marks of hexagon nuts, style 2.

This Standard specifies general technical delivery requirements for steel and steel products contained in GB/T 15574 (excluding steel and powder metallurgy products). When the provisions of productstandard or agreement in the contract are inconsistent with the provisions of this Standard, the provisions of productstandard or agreement in the contract shall prevail.

This Standard specifies the type and dimension, technical conditions and marks of slotted countersunk flat head screws.