Common Japanese grades in general and mechanical structural steel plates

 Common Japanese grades in general and mechanical structural steel plates

　　1. In the grades of Japanese steel (JIS series), ordinary structural steel is mainly composed of three parts. The first part indicates the material.

　　For example: S (Steel) means steel, F (Ferrum) means iron; the second part means different shapes, types and uses, such as P (Plate) means plate, T (Tube) means tube, K (Kogu) means tool; The third part represents the characteristic number, generally the minimum tensile strength. For example: SS400--the first S means steel (Steel), the second S means "Structure", 400 is the lower limit tensile strength of 400MPa, and the whole means ordinary structural steel with a tensile strength of 400 MPa.

　　2. SPHC--the first S is the abbreviation of Steel, P is the abbreviation of Plate, H is the abbreviation of Heat, and C is the abbreviation of Commercial. The whole indicates that hot-rolled steel plates and steel strips are generally used.

　　3. SPHD--Indicates hot-rolled steel sheets and strips for stamping.

　　4. SPHE--Indicates hot-rolled steel sheets and strips for deep drawing.

　　5. SPCC--means cold-rolled carbon steel sheets and strips for general use, which is 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 represent SPCCT.

　　6. SPCD--Indicates cold-rolled carbon steel sheet and strip for stamping, which is equivalent to China's 08AL (13237) high-quality carbon structural steel.

　　7. SPCE--Indicates cold-rolled carbon steel sheet and strip for deep drawing, which is equivalent to China's 08AL (5213) deep drawing steel. When it is necessary to ensure non-timeliness, add N at the end of the grade to be SPCEN. Quenching and tempering code for cold-rolled carbon steel sheet and steel strip: A for annealed state, S for standard quenching and tempering, 8 for 1/8 hard, 4 for 1/4 hard, 2 for 1/2 hard, 1 for hard. Surface processing code: D for dull finish rolling, B for bright finish rolling. For example, SPCC-SD means standard quenched and tempered, matte finish rolled general cold rolled carbon sheet. Another example is SPCCT-SB, which means standard quenching and tempering, bright processing, and cold-rolled carbon sheets that require guaranteed mechanical properties.

　　8. The method of expressing the steel grade for JIS mechanical structure is: S + carbon content + letter code (C, CK), where the carbon content is expressed by the median value × 100, the letter C: indicates carbon K: indicates carburizing steel. For example, carbon knot coil S20C has a carbon content of 0.18%~0.23%.



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