Introduction to general cold rolled sheets
It is a product obtained by cold pressure processing of hot rolled sheet. Due to multiple passes of cold rolling, its appearance quality is better than that of hot-rolled sheets. After heat treatment, it can obtain good mechanical properties.
1. Application classification of general cold-rolled plates
According to the different needs of production enterprises, cold-rolled plates are usually divided into: general-purpose cold-rolled plates, stamping-grade cold-rolled plates, deep-drawing, extra-deep-drawing and ultra-deep-drawing grade cold-rolled plates, generally coils and flat sheets Delivery, thickness is expressed in millimeters, width is generally: 1000mm and 1250mm, length is generally 2023mm and 2500mn.
2. General grades of cold-rolled plates
Commonly used grades are: Q195, Q215, Q235, 08AI, SPCC, SPCD, SPCE, SPCEN, STI2, ST13, ST14, ST15, ST16, DC01, DC03, DC04, DC05, DC06, etc.;
ST12: represents the most general steel grade, which is basically the same material as Q195, SPCC, and DC01 grades;
ST13/14: Steel grade expressed as stamping grade, which is basically the same material as 08AL, SPCD, and DC03/04 grades;
ST15/16: Steel grade expressed as stamping grade, which is basically the same material as 08AL, SPCE, SPCEN and DC05/06 grades.
3. How to express the grade size of general cold-rolled plates
For example, ST12, 1*1250*2500/C, expressed as: The grade ST12 is a general cold plate, the thickness is 1mm, the width is 1250mm, the length is 2500mm or C coil. The appearance is tinplate packaging, and the mechanical properties are the most general and basic steel grade. It can only be used for bending and forming, not stamping. Used for mechanical bites, such as refrigerator casings, vehicle fuel tanks, etc.
Products above ST13 are used in industries that require deep drawing, such as automobile manufacturing, diesel engine fuel tanks, etc. The specific type to be used depends on the deep drawing requirements.
The difference between ST12 and SPCC: the mechanical properties of the two products are almost the same, but the return methods are different. The tensile properties of products made of ST12 are stronger than those of SPCC.
Japanese JIS standard material meaning
SPCC---S means steel, P means plate, C means cold, C means quotient
Commercial (Commercial), which is the Japanese JIS standard.
If you need to ensure the tensile strength, add T at the end of the grade, which is: 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. If you need to ensure non-timeliness, add N to the end of the brand name to indicate SPCEN. Quenching and tempering code 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 full hardness is 1. Surface processing code: matte finish rolling is D, bright finish rolling is B. For example, SPCC-SD represents standard quenched and tempered, matte finish-rolled general-purpose cold-rolled carbon sheets. Another example is SPCCT-SB, which represents standard tempered, bright and cold-rolled carbon sheets that require guaranteed mechanical properties. Another example is SPCC-1D, which represents a hard matte finish-rolled cold-rolled carbon steel sheet. The expression method of steel grades for mechanical structures is: S+carbon content+letter code (C, CK), where the carbon content is represented by the median value * 100, the letter C represents carbon, and the letter K represents carburizing steel. For example, the carbon content of carbon rolled plate S20C is 0. 18-0. 23%.
