This Standard specifies the designation, sampling location and preparation requirements of mechanical testing of section steel, steel bar, steel wire rod, steel plate and steel pipe defined in GB/T 15574. This Standard is applicable to the sampling and preparation of samples and test pieces for mechanical testing of steel and steel products. If it is indicated in the contract, this Standard is also applicable to other metal products. These test materials and samples can be tested in accordance with relevant product standards, material standards or test standards.