This standard defines size, shape, weight and allowable tolerance, technical requirement, test method, check and acceptance regulations, packing, mark and quality certificate etc. of hot-rolled and forged alloy structure steels.
This standard is suitable for alloy structure steel bars with diameters or thickness not larger than 250 mm. Those steel bars with diameters or thickness larger than 250 mm can also be supplied after negotiation by both supplier and customer
The chemical content of brands defined by this standard is also suitable for steel ingot, billet and their products.
