1. Japanese steel (JIS series) in the grade of ordinary structural steel mainly consists of three parts: the first part (indicating the material: S 〈Steel〉 steel, F 〈Ferrum〉iron)+ the second part (indicating the shape, type, use: P 〈Plate〉representation of the plate, T 〈Tube〉representation of the tube, K 〈Kogu〉representation of the tool, S 〈Structure〉representation of structure) + the third part (indicating the characteristic numbers, generally the minimum tensile strength) ) + the third part (indicating the characteristics of the number, generally the minimum tensile strength)
(1) SS400 - the first S that the steel (Steel), the second S that the structure (Structure), 400 for the lower limit of tensile strength of 400 MPa, the overall tensile strength of 400 MPa of the ordinary structural steel.
(2) SPHC - the first S said steel (Steel), the second P said plate (Plate), the third H said heat (Heat), the fourth C said commercial (Commercial), the whole said that the general use of hot-rolled steel plate and steel strip.
(3) SPHD - the first S indicates steel (Steel), the second P indicates plate (Plate), the third H indicates heat (Heat), the fourth D indicates stamping (Drawing), the whole indicates hot rolled steel sheet and strip for stamping.
(4) SPHE - the first S indicates Steel, the second P indicates Plate, the third H indicates Heat, the fourth E indicates Deep Drawing, and the whole indicates Hot Rolled Steel Sheets and Strips for Deep Drawing.
(5) SPCC - the first S indicates steel (Steel), the second P indicates plate (Plate), the third C indicates cold (Cold), the fourth C indicates commercial (Commercial), the whole indicates the general use of cold-rolled carbon steel sheet and strip, equivalent to China Q195-215A Brand name. Which need to ensure that the tensile test, in the end of the grade plus T for SPCCT.
(6) SPCD - the first S said steel (Steel), the second P said plate (Plate), the third C said cold (Cold), the fourth D said that the stamping (Drawing), the overall representation of the stamping of cold-rolled carbon steel sheet and strip, equivalent to China 08AL (13237) High-quality carbon structural steel.
(7) SPCE - the first S indicates steel (Steel), the second P indicates plate (Plate), the third C indicates cold (Cold), the fourth E indicates deep drawing, the whole indicates cold rolled carbon steel sheet and strip for deep drawing, equivalent to China 08AL (5213) deep drawing steel. To ensure that the non-ageing, in the end of the grade plus N for SPCEN. 2.
2. JIS mechanical structural steel grade is expressed as follows: the first part (S 〈Steel〉 steel) + the second part (carbon content: with the middle value × 100) + the third part (letter code: the letter C means carbon K means carburised steel), such as carbon coiled plate S20C its carbon content of 0.18-0.23%.
