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Professional manufacturer of cold rolled coil in China

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If you need to purchase cold-rolled steel coils from China, you should first find a professional cold-rolled steel coil manufacturer in China. You can ask the coil manufacturer for the latest information about coil properties, chemical composition, coil manufacturing standards and coil prices. A professional steel coil supplier will give you a timely and effective scheme.


About cold rolled coil

Cold-rolled coils are made from hot-rolled coils, which are rolled at room temperature below the recrystallization temperature, including plates and coils. Among them, those delivered in sheets are called steel plates, also known as box plates or flat plates; those with long lengths and delivered in coils are called steel strips, also known as coil plates.

Cold-rolled-coil.jpg

Definition of cold rolling

It is rolling under recrystallization, but it is generally understood as rolling using a material rolled at room temperature. Aluminum cold rolling is divided into plate rolling and foil rolling. Those with a thickness of 0.15~ or more are called sheets, and those with a thickness of 0.15~ or less are called foils. The cold rolled coil manufacturers in China mostly use 3 to 6 continuous rolling mills as cold rolling equipment.

Since there is no heating in the production process, there are no defects such as pitting and iron oxide scale that often occur in hot rolling, and the surface quality is good and the finish is high. Moreover, the dimensional accuracy of cold-rolled products is high, and the performance and structure of the products can meet some special requirements, such as electromagnetic properties, deep drawing properties, etc.

Specifications: The thickness is 0.2-4mm, the width is 600-2 000mm, and the length of the steel plate is 1 200-6 000mm.

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

Properties: Low carbon steel grades are mainly used, which are required to have good cold bending and welding properties, as well as certain stamping properties. is eliminated (greatly reduced), that is, the yield strength decreases close to that before cold rolling.

Chemical composition of cold rolled coil (Wt%)

Grade

C

Mn

P

S

Alta

Tib

DC01SPCC

≤0.12

≤0.60

≤0.045

≤0.045

≥0.020


DC02SPCD

≤0.10

≤0.45

≤0.035

≤0.035

≥0.020


DC03、SPCE

≤0.08

≤0.40

≤0.030

≤0.030

≥0.020


DC04、SPCF

≤0.06

≤0.35

≤0.025

≤0.025

≥0.015


 

About Coils

Coiled plate is a kind of plate in steel. It is actually a long and narrow thin steel plate supplied in coils. The difference between "coil" and "flat" is a cutting package.

Chilled coil is obtained by pickling and cold rolling of hot-rolled coil. It can be said to be a type of cold rolled coil.

Cold-rolled coils (annealed): hot-rolled coils are obtained by pickling, cold rolling, bell annealing, leveling, and (finishing).

There are three main differences between chilled coil and cold rolled coil:

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

2. The surface quality, structure, dimensional accuracy and other cold-rolled sheets are better than chilled coils.

3. In terms of performance, because the cold hard coil obtained directly from the hot rolled coil through the cold rolling process undergoes work hardening during cold rolling, the yield strength increases and some internal stress remains, and the external performance is relatively "hard". Called chilled coil.

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

Generally, the default delivery state of cold-rolled coils is annealed.

Mechanical properties of cold rolled coils

DC01, DC02, DC03, DC04

Grade

Yield Strength RcL

Mpa

Tensile strength Rm

Mpa

Elongation A80mm

%

Plastic strain ratio r90

Strain hardening exponent n90

DC01

140~280

270~410

≥28



DC02

140~240

270~370

≥34

≥1.4


DC03

120~210

270~350

≥38

≥1.8

≥0.18

DC04

120~180

270~330

≥40

≥2.0

≥0.20

SPCC, SPCD, SPCE

Grade

Yield Strength   Rcl MPa

Tensile strength RmMPa

Plastic strain ratio r90

Strain hardening exponent n90

SPCC

130~300

270~410



SPCD

120~240

270~370

≥1.3


SPCE

120~210

270~350

≥1.8

≥0.18

Note:

a) The tensile test takes the transverse pattern; the pattern width b is 25mm, and the pattern gauge length L0 is 50mm.

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

c) When the product thickness is >1.50mm and ≤2.0mm, the value of r90 or r is allowed to decrease by 0.1 (absolute value); when the thickness is >2.0mm, the value of r90 or r is allowed to decrease 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.

Uses of folded cold rolled coils

Cold-rolled coils are used in a wide range of applications, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, and canned food. 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-rolled sheet, and sometimes mistakenly written as cold-rolled sheet. The cold plate is a hot-rolled steel strip of ordinary carbon structural steel, which is further cold-rolled into a steel plate with a thickness of less than 4mm. Due to rolling at room temperature, no scale is produced. Therefore, the cold plate has good surface quality and high dimensional accuracy. Coupled with annealing treatment, its mechanical properties and process properties are superior to those of hot-rolled steel sheets. In many fields, especially In the field of home appliance manufacturing, it has gradually replaced hot-rolled sheet steel.

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

Symbols for cold rolled coils in China

1. Q- the code name of the yield point (limit) of ordinary carbon structural steel, it is the capitalization of the first Chinese pinyin letter of "Qu"; 195, 215, 235, 255, 275-represent their yield point (limit) value, unit: MPa (N/mm2); because the comprehensive mechanical properties such as strength, plasticity, toughness and weldability of Q235 steel are the best among ordinary carbon structural steel, it can better meet the general use. requirements, so the application range is very wide.

2. S-steel, P-plate, C-cold, fourth C-common.

3. ST-Steel (Steel), 12-Ordinary grade cold-rolled thin steel plate, marking: Dimensional Accuracy-Dimension-Steel Type Standard Cold-Rolled Steel Plate: Steel Number-Technical Conditions Standard Marking Example: B-0.57501500-GB708-88; Steel Plate , Standard No. Q/BQB402, grade SPCC, heat treatment state annealing + smoothing (S), the central processing state is pitted D, the surface quality is FB grade trimming (cutting EC, non-trimming EM) steel plate, thickness 0.5 mm, B-grade accuracy, width 1000mm, A-grade accuracy, length 2000mm, A-grade accuracy, roughness accuracy is PF.A, then marked as: steel plate ECQ/BQB 402-SPCC-SD-FB/(0.51000A2000A-PF. A);

Classification of folded cold rolled coils

Cold-rolled steel sheet: with smooth surface and excellent processing, it is used in home appliances such as automobiles, refrigerators, and washing machines, as well as industrial equipment and various building materials. With the development of economy, cold-rolled steel sheet has been called an essential material in modern society. Classification of cold-rolled products: hot-rolled pickling, hard-rolled coil, ordinary cold-rolled, galvanized (electro-galvanized, fingerprint-resistant, hot-dip galvanized), galvanized, electroplated tin, color-coated, electrical steel (silicon steel sheet) Wait.

Cold-rolled ordinary thin steel plate: cold-rolled from ordinary carbon structural steel or low-alloy structural steel. The surface quality of the cold-rolled sheet is better. Has good stamping properties. It is required to ensure that the cold bending and cup tests are qualified, and it is often used in industries such as automobiles and as raw materials for plated sheets.

Cold-rolled high-quality steel sheets: mainly include various high-quality steel cold-rolled sheets, the most commonly used are carbon structural steel sheets, especially cold-rolled steel sheets for deep drawing, which are cold-rolled sheets from low-carbon high-quality steel 08Al. The quality is divided into three groups; Ⅰ, Ⅱ, Ⅲ, respectively represent the special high-grade, high-grade, high finishing surface, according to the drawing grade is divided into ZF, HF, F grade (representing the most complex and very complex for punching and drawing Complex and complicated parts). According to the allowable deviation of the thickness of the steel plate, it is divided into A and B levels of precision, which are widely used in the automobile and tractor industry.

Hard-rolled coils: Continuous rolling of hot-rolled pickled coils at room temperature.

Product features of Hard-rolled coils: Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor. Only simple directional bending of less than 90 degrees (perpendicular to the coiling direction) can be performed.

How to deal with the rust of cold rolled steel plate?

Cold rolling is generally a rolled sheet or very thin sheet, which has high requirements on the surface quality of the steel sheet. The raw materials are generally hot-rolled coils imported from other hot-rolling plants. During the transportation process, especially after a long storage time, the oxidation is more serious. Pickling can wash off defects such as iron oxide scale and rust spots on the surface of raw materials, making the surface smooth and clean.

Why do cold rolled steel plates need to be pickled?

1. Pickling of cold-rolled steel sheets can avoid accidents such as broken strips and sticking of steel during rolling.

2. Pickling of cold-rolled steel plate can make the surface of the finished product smooth, without black spots and rust, and reduce the generation of defective products

Generally, two commonly used pickling methods for cold-rolled steel are sulfuric acid and hydrochloric acid, which are low in cost, can quickly dissolve the oxide scale, and have a short pickling time, affecting the flatness and aesthetics of the cold-rolled steel surface, and causing great harm to the human body.

For the anti-rust treatment of cold-rolled steel, the general operation is surface oiling and anti-rust packaging.

After pickling and passivation of cold-rolled steel and thorough cleaning of the surface, immediately smear or soak in anti-rust oil on the surface. Rust occurs during transportation and storage.

Professional manufacturer of cold rolled coil in China

If you need to purchase cold-rolled steel coils from China, you should first find a professional cold-rolled steel coil manufacturer in China. You can ask the coil manufacturer for the latest information about coil properties, chemical composition, coil manufacturing standards and coil prices. A professional steel coil supplier will give you a timely and effective scheme.


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