What is cold rolled sheet

Cold rolled plate is short for common carbon structural steel cold rolled plate, also known as cold rolled plate, commonly known as cold plate. Cold plate is made of ordinary carbon structural steel hot rolled steel strip, after further cold rolled into less than 4mm thickness of steel plate. Due to rolling at room temperature, no oxide sheet, therefore, the surface quality of cold plate is good, high dimensional accuracy, coupled with annealing treatment, its mechanical properties and technological properties are better than hot rolled thin steel plate, in many fields, especially in the field of household appliances manufacturing, has gradually replaced the hot rolled thin steel plate with it.

Cold rolled sheet is widely used in automotive panel manufacturing, electrical products, aviation, precision instruments, canned food and so on. Cold rolled coil can provide a large number of high precision and excellent performance of steel plate and strip, cold rolled coil products precise size, uniform thickness; Extremely thin strip (up to 0.001mm or less) that cannot be produced by hot rolling process can be obtained; The surface quality of cold rolled products is superior, and there is no pitting, pressing into oxide sheet and other defects that often occur in hot rolled sheet rolls.

JIS Standard for Marking of Steel grades for General structures

•  Ordinary structural Steel in Japanese Steel grades is mainly composed of three parts: the first part represents the material, for example, S(Steel) represents the Steel, F(Ferrum) represents the iron; The second part represents different shapes, types and uses, such as P(Plate) for Plate, T(Tube) for Tube, K(Kogu) for tool; The third part represents the characteristic number, which is generally the minimum tensile strength. For example :SS400-- the first S stands for Steel, the second S stands for "Structure", 400 is the lower limit tensile strength of 400MPa, the overall tensile strength of 400MPa ordinary structural Steel.

• SPHC-- the first position S stands for Steel, P for Plate, H for Heat, and C for Commercial. It generally refers to hot-rolled Steel plates and Steel belts.

• SPHD-- stands for hot rolled steel plate and strip for stamping.

• SPHE-- stands for hot rolled steel plate and strip for deep drawing.

• SPCC-- stands for cold rolled carbon steel sheet and strip, equivalent to China'S Q195~Q215A brand and Germany's ST12 brand. The third letter, C, stands for Cold. To ensure mechanical properties, add T at the end of the brand, such as SPCCT.

• SPCD-- cold rolled carbon steel sheet and strip for stamping, equivalent to 08AL(13237) high quality carbon structural steel of China, equivalent to German ST13.

• SPCE-- cold rolled carbon steel sheet and strip for deep drawing, equivalent to 08AL(5213) deep drawing steel of China, equivalent to German brand ST14. Aging treatment, add N at the end of the brand, such as SPCEN.

Code name

• Cold-rolled carbon steel sheet and strip quenching and tempering code: annealing state A, standard quenching and tempering S, 1/8 hard for 8,1/4 hard for 4,1/2 hard for 2, hard for 1.

• Surface processing code: dull finishing for D, bright finishing for B. Such as SPCC-SD standard quenching and tempering, matte fine rolling with the general cold rolled carbon sheet. For example, SPCCT-SB stands for standard quenching and tempering, bright processing, and cold rolled carbon sheet required to ensure mechanical properties.

Symbol

•  Q- ordinary carbon structural steel yield point (limit) code, it is "bend" the first Chinese phonetic alphabet of the case; 195, 215, 235, 255, 275- respectively represent the value of their yield point (limit), in MPa(N/mm2); Because the strength, plasticity, toughness, weldability and other comprehensive mechanical properties of Q235 steel in ordinary carbon structural steel is the best, can better meet the requirements of general use, so the application range is very wide.

• S-steel, P-plate, C-cold and the fourth C-Commercial grade.

•  ST-steel (Steel), 12-ordinary grade cold rolled sheet Steel,

Marking: dimensional precision - dimensional - plate type standard

Cold rolled steel plate: Steel number - Specification standard

Mark example :B-0.57501500-GB708-88; Steel plate, Standard No. Q/BQB402, Grade SPCC, Annealed + flat (S), surface quality FB grade cut edge (Cut edge EC, not cut edge EM) steel plate, thickness 0.5mm, Grade B accuracy, width 1000mm, Grade A accuracy, length 2000mm, Grade A accuracy, If the unevenness accuracy is Pf. A, it is marked as: steel plate ECQ/BQB 402-SPCC-SD-FB/(0.51000A2000A-PF.A);

Cold rolled steel plate :Q225-GB912-89

General requirements for acceptance

Each batch of steel plate delivered must have a quality assurance document, the type of inspection document should be in accordance with ASTM A6M and other provisions, clear handwriting without alteration marks.

Deviation of size, thickness and length of steel plate within allowable deviation

Also pay attention to plate surface flatness, plate waviness, appearance and corrosion grade

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