SPHE - represents hot-rolled steel plates and strips for deep drawing.

SPCC - represents generally used cold-rolled carbon steel sheets and strips, equivalent to China's Q195-215A grade. The third letter C is the abbreviation of Cold. When it is necessary to ensure the tensile test, add T at the end of the grade to indicate SPCCT.

SPCD - represents cold-rolled carbon steel sheets and strips for stamping, equivalent to China's 08AL (13237) high-quality carbon structural steel.

SPCE - represents cold-rolled carbon steel sheets and strips for deep drawing, equivalent to China's 08AL (5213) deep drawing steel. When non-timeliness needs to be ensured, add N to the end of the grade to indicate SPCEN.

Quenching and tempering codes for cold-rolled carbon steel sheets and steel strips: annealing state is A, standard quenching and tempering is S, 1/8 hardness is 8, 1/4 hardness is 4, and 1/2 hardness is 2.

Surface processing code: D for matte finish rolling, B for bright finish rolling. For example, SPCC-SD represents standard quenched and tempered, matte finish-rolled, generally cold-rolled carbon sheets. For example, SPCCT-SB represents cold-rolled carbon sheets with standard tempering and bright processing, which require guaranteed mechanical properties.

JIS mechanical structure steel grade representation method is: S+: Carbon content + letter code (C, CK), where the carbon content is represented by the intermediate value x100, the letter C: represents carbon, and K: represents carburizing steel. For example, the carbon content of carbon rolled plate S20C is 0.18-0.23%.