Cold Rolled Coil (CRC) And Sheet

Tangshan Donggang Metal Sheet Manufacturing Co., Ltd.

Shandong Guanzhou Co., Ltd.

Hebei Zhaojian Metal Product Co., Ltd.

Shougang Group

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Deep in the industry for decades

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 Products Description:
 

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Cold rolled coil 

Cold-rolled sheet (annealed) :

The cold-rolled sheet is annealed under the hood before rolling, and the work hardening phenomenon and internal stress are eliminated (greatly reduced) after annealing,
that is, the yield strength is reduced close to the cold rolling before.

The cold-rolled sheet coil consists of sheet and coil, which is rolled at room temperature and below the recrystallization temperature.

Among them, the delivery of sheets is called steel plate, also known as box plate or plate; The long length and roll delivery are called steel belts, also known as roll plates.

Specification:

Thickness of 0.2-4mm,

Width of 600-2000mm,

steel plate Length of 1200-6000mm.

Grade:

Q195A-Q235A, Q195AF-Q235AF, Q295A(B)-Q345 A(B); SPCC, SPCD, SPCE, ST12-15; DC01-06

Performance:

Mainly used low carbon steel grades, requiring good cold bending and welding performance, as well as a certain stamping performance.

Coil

Coil is a kind of plate in steel, which is actually a thin steel plate that is long and narrow and supplied in rolls.

The difference between a roll and a plate is a cut package.

Chilled coil is hot rolled coil through pickling and cold rolling. It can be said that it is a kind of cold rolled sheet coil.

Cold rolled coil (annealed) : hot rolled coil is obtained by pickling, cold rolling, hood annealing, leveling, (finishing).

There are three main differences between the two:

1. In appearance, the general chilled coil is a little faint.

2. surface quality, structure, dimensional accuracy and other cold-rolled plate is better than cold-rolled plate.

3. in terms of performance, due to the cold-rolled coil directly obtained by the cold-rolled process, the cold-rolled coil occurs work hardening during cold rolling,
resulting in an increase in yield strength and residual part of the internal stress, and the external performance is relatively "hard", so it is called cold-rolled coil.

Therefore, the yield strength: the cold-rolled coil is greater than the cold-rolled coil (annealed), which makes the cold-rolled coil (annealed) more conducive to stamping.

Generally, the default delivery condition of cold rolled coil is annealed.

There are many models of cold rolled steel coils, some of which are common include:
- SPCC, SPCD, SPCE, ST12-15;
- DC01-06;
- Q195A-Q235A, Q195AF-Q235AF, Q295A(B)-Q345 A(B);
- Ordinary carbon structural steel coil: thickness 1.2-14mm, width 600-2000mm;
- Low alloy high strength structural steel coil: thickness 1.2-14mm, width 600-2000mm;
- Cold rolled silicon steel coil: thickness 0.3-1.0mm, width 800-1300mm;
- Stainless steel coil: thickness 0.3-6mm, width 1000-2000mm;
- Galvanized steel coil: thickness 0.3-4mm, width 800-2000mm.

Application:

Cold Rolled Coil is widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, food cans and so on.

Cold-rolled steel sheet is the abbreviation of ordinary carbon structural steel cold-rolled sheet, also known as cold-rolled sheet,
commonly known as cold plate, sometimes mistakenly written as cold tie plate.

Cold plate is made of ordinary carbon structural steel hot rolled steel strip, after further cold rolling to make a thickness of less than 4mm steel plate.

Because it is rolled at room temperature, no oxide sheet is produced, therefore, the surface quality of the cold plate is good,
the dimensional accuracy is high, coupled with annealing treatment,
its mechanical properties and technological properties are better than the hot-rolled sheet steel, in many fields,
especially in the field of home appliance manufacturing, has gradually replaced the hot-rolled sheet steel with it.

Applicable brand: Q195, Q215, Q235, Q275; SPCC (Japanese brand); ST12 (German brand)

Symbol:

1, Q - ordinary carbon structural steel Yield Point (limit) code, it is the "Qu" of the first Chinese pinyin letter of the case;
195, 215, 235, 255, 275 - values representing their yield point (limit), respectively,Unit: MPa (N/mm2);
Because the comprehensive mechanical properties of Q235 steel such as strength, plasticity, toughness and weldability are the best in ordinary carbon structural steel,
it can better meet the general requirements of use, so the application range is very wide.

2, S-steel, P-plate, C-cold rolled, Fourth C-common grade.

3, ST-steel (Steel), 12-ordinary grade cold rolled sheet steel,
Marking: dimensional accuracy - dimension - steel variety standard
Cold rolled steel plate: steel number - Technical conditions standard
Marking example: B-0.57501500-GB708-88;
Steel plate, standard Q/BQB402, grade SPCC, heat treatment state annealing + flat (S), surface central processing state is pitted D,
surface quality is FB grade cutting edge (cutting edge EC, not cutting edge EM) steel plate, thickness 0.5mm, B grade accuracy,
width 1000mm, A grade accuracy, length 2000mm, A grade accuracy, If the roughness accuracy is PF.A,
it is labeled as: steel plate ECQ/BQB 402-SPCC-SD-FB/ (0.51000A2000A-PF.A); 

Cold-rolled steel plate
Brand: Q225-GB912-89 The main producing areas are: Baosteel, Angang, Bensteel, Wuhan Iron and Steel, Handan Iron and Steel, Baogang, Tang Steel, Lian Steel, Jinan Steel and so on.

Cold-rolled ordinary sheet steel:
It is made of ordinary carbon structural steel or low alloy structural steel cold rolled. The surface quality of cold rolled sheet is better. It has good stamping performance.
It is required to ensure that the cold bending and cup test is qualified, which is often used as raw materials for automotive industries and coated plates.

Cold-rolled high-quality sheet steel:
Mainly includes a variety of high-quality steel cold-rolled sheet, the most commonly used is carbon structure steel, especially with deep stamping cold-rolled steel sheet,
is made of low carbon high-quality steel 08Al cold-rolled sheet, steel plate is divided into three groups according to surface quality; Ⅰ, Ⅱ, Ⅲ, respectively,
that is especially advanced, advanced, higher finishing surface, according to the drawing level is divided into ZF, HF, F (representing the most complex, very complex,
complex parts for punching drawing). According to the allowable deviation of the thickness of the steel plate, it is divided into A and B two levels of accuracy,
and is widely used in the automobile tractor industry.

Cold rolled steel plate:
Smooth surface, excellent processing, used in automobiles, refrigerators, washing machines and other home appliances, as well as industrial equipment, a variety of building materials.
With the development of economy, cold-rolled steel plate has been called a necessary material in modern society.
Classification of cold rolling products: hot pickling, hard rolling, ordinary cold rolling, galvanizing (electric galvanizing, fingerprint resistance, hot galvanizing), aluminum plating,
tin plating, color coating, electrical steel (silicon steel sheet), etc.

Hot rolled pickling coil:
Using high-quality hot-rolled sheet as raw material, after the pickling unit removes the oxide layer, cutting edge, finishing, surface quality
and use requirements (mainly cold forming or stamping performance) between the hot-rolled plate and cold-rolled plate intermediate products,
is an ideal substitute for some hot-rolled plate and cold-rolled plate.

Hard rolled coil:
The hot rolled pickling coil is rolled continuously at room temperature. Because it has not been annealed, its hardness is very high (HRB greater than 90),
the machining performance is very poor, and only a simple directional bending process of less than 90 degrees (perpendicular to the winding direction) can be carried out.

 Note:

a) Transverse style is taken for tensile test; The pattern width b is 25mm and the pattern mark distance L0 is 50mm.

b) When there is no obvious yield point, Rel can be replaced by Rp0.2; When the thickness of the product is < 0.70mm and ≥0.50mm,
the upper limit of the yield strength can be increased by 20N/mm2, and when the thickness is < 0.50mm, it can be increased by 40N/mm2.

e) When the thickness of the product is > 1.50mm and ≤2.0mm, the value of r90 or r is allowed to be reduced by 0.1 (absolute value);
When the thickness is > 2.0mm, the value of r90 or r can be reduced by 0.2 (absolute value);

d) The values of r90 and n90 or r and n are only applicable to products with thickness ≥0.50mm; r = (r0+r45+r90) /4,

n = (n0+n45+n90) /4.