GB/T 14977-2008 Translated English of Chinese Standard. (GBT 14977-2008, GB/T14977-2008, GBT14977-2008): General requirement for surface condition of hot-rolled steel plateshttps://www.chinesestandard.net, 2018. 10. 19. - 16페이지 This standard specifies the terms and definitions, classification, requirements, and numerical rounding off of the surface quality of hot-rolled steel plates. This standard is applicable to single sheet hot-rolled steel plates with thickness of 3mm ~ 400mm and shear steel plates made from hot-rolled coils, hereinafter referred to as steel plates. |
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20mm distance aggregated surface discontinuity Appendix A Informative area does exceed area with thickness Common surface discontinuities cracks defects depth exceeding descaled Determination of affected discontinuities of depth discontinuities with depth discontinuity and ground discontinuity depth exceeds exceeding the specifications Grade grinding depth heat treatment horizontal edges 20mm Horizontal line Figure hot rolling hot-rolled steel plates inspected area Isolated surfaces discontinuity less than 20mm longitudinal and horizontal manufacturer is allowed Maximum allowable depth meet the requirements minimum allowable thickness minimum thickness mm Nominal thickness Nominal thickness Number rounding-off oxidized iron plate shall prevail product t Maximum quality shall meet remaining thickness less repair welding repaired area representative surface discontinuity requirements in Table requirements of surface rolling direction set of discontinuities shells and seams specifications in Table specified limit value Strip surface discontinuity surface discontinuity depth surface discontinuity Unit surface quality thickness of product total affected area visible surface discontinuities welding repair YB/T