1. This standard applies to carbon structural steel, structural steel for ship hulls, and hot-rolled diamond-shaped, lentil-shaped, and round bean-shaped pattern steel plates of high weather-resistant structural steel.
2. Referenced standards: Sample taking methods for chemical analysis of GB222 steel and allowable deviations of chemical composition of finished products, general provisions for acceptance, packaging, marking and quality certificates of GB247 steel plates and steel strips. GB700 carbon structural steel GB709 hot-rolled steel plates and strips size, shape, weight and allowable deviations GB712 structural steel for hull GB4171 high weather resistance structural steel.
3. The size, shape, weight and allowable deviation of the steel plate 3.1 The size of the patterned steel plate should comply with the following regulations: basic thickness: 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0, 8.0mm. Width: 600 ~1800mm, upgrade according to 50mm. Length: 2000~12000mm, upgrade according to 100mm. Upon agreement between the supplier and the buyer, patterned steel plates or rolled patterned steel strips of sizes other than those specified in this standard can be supplied.
4. The allowable deviation of the length and width of the patterned steel plate should comply with the provisions of GB709. The patterned steel plates produced by continuous rolling mills do not need to be cut along the longitudinal edges.