- Common structural steel in Japanese steel (JIS series) grades mainly consists of three parts: the first part (indicating material: S〈Steel〉steel, F〈Ferrum〉iron) + the second part (indicating shape, type, use: P〈 Plate> represents plate, T〈Tube〉 represents tube, K〈Kogu〉 represents tool, S〈Structure〉 represents structure) + the third part (represents characteristic number, usually the lowest tensile strength) such as:
1) SS400 - the first S represents steel, the second S represents structure, 400 represents the lower limit tensile strength of 400MPa, and the overall represents ordinary structural steel with a tensile strength of 400MPa.
2) SPHC - the first S represents Steel, the second P represents Plate, the third H represents Heat, the fourth C represents Commercial, and the overall representation is generally heat. Rolled steel plates and strips.
3) SPHD - the first S stands for Steel, the second P stands for Plate, the third H stands for Heat, the fourth D stands for Drawing, and the whole stands for stamping. Hot rolled steel plates and strips.
4) SPHE - the first S represents steel, the second P represents plate, the third H represents heat, the fourth E represents deep drawing, and the whole represents hot rolling for deep drawing. Steel plates and steel strips.
5) SPCC - the first S stands for Steel, the second P stands for Plate, the third C stands for Cold, and the fourth C stands for Commercial. The overall expression is generally cold. Rolled carbon steel sheets and strips, equivalent to China's Q195-215A grade. When it is necessary to ensure the tensile test, add T at the end of the grade to indicate SPCCT.
6) SPCD - the first S stands for Steel, the second P stands for Plate, the third C stands for Cold, the fourth D stands for Drawing, and the whole stands for stamping. Cold-rolled carbon steel sheets and strips, equivalent to China's 08AL (13237) high-quality carbon structural steel.
7) SPCE - the first S represents steel, the second P represents plate, the third C represents cold, the fourth E represents deep drawing, and the whole represents cold rolling for deep drawing. Carbon steel sheets and strips, 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.
- Other symbols:
1) Quenching and tempering codes of 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, 1/2 hardness is 2, and hardness is 1 .
2) Surface processing code: D for matte finish rolling and B for bright finish rolling. For example, SPCC-SD represents standard quenched and tempered, matte finish rolling, generally used cold-rolled carbon sheets. Another example is SPCCT-SB, which represents cold-rolled carbon sheets with standard tempering and bright processing, requiring guaranteed mechanical properties.
- JIS mechanical structure steel grade representation method
The first part (S<Steel> steel) + the second part (carbon content: expressed as the middle value × 100) + the third part (letter code: the letter C represents carbon and K represents carburizing steel) such as carbon rolled plate S20C Its carbon content is 0.18-0.23%.
