hot sale hot dip prepainted galvanized steel coil low price
Hot rolled coils use slabs (mainly continuous casting billets) as raw materials, and after heating, they are made into strip steel by the rough rolling mill and the finishing mill. The hot steel strip from the last rolling mill of finishing rolling is cooled to a set temperature by laminar flow, and then coiled into a steel strip by a coiler. The cooled steel strip undergoes different finishing operations according to the different needs of users. Lines (flattening, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) are processed into steel plates, flat coils and slit steel strip products. Because of the high strength, good toughness, easy processing and good weldability and other excellent properties of hot strip products, they are widely used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, and pressure vessels.
With the increasing maturity of new hot-rolled dimensional accuracy, shape, surface quality and other control technologies and the continuous advent of new products, hot-rolled steel sheets and strip products have been more and more widely used and have become more and more powerful in the market. Competitiveness. Hot-rolled steel products include steel strips (coils) and steel sheets cut from them. The steel strip (roll) can be divided into straight hair rolls and finishing rolls (divided rolls, flat rolls and slit rolls).
1.1 The unevenness of the steel plate shall not be greater than 12mm. The unit length of roughness measurement is 1000mm.
1.2 The sickle bend of steel plate and steel belt shall not be larger than 4mm every 2 meters.
1.3 The width tolerance of steel plates and strips should meet the requirements of the following table. Allowable width deviation (mm) Thickness range (mm) >2.0-2.8 >2.8-3.5 Edge trimming 0~+3 0~+5 Edge trimming +20 (target value +10) 1.6 The overflow edge of the steel coil head and tail should not be greater than 40mm, the middle overflow edge and tower height should not be greater than 30mm.
1.4 The weight of each coil should be 5-25 tons.
Mechanical properties Nominal thickness Yield strength (Mpa) Tensile strength (Mpa) Elongation A50mm% 180 degree bending test >1.5-2.5 ≤290 ≥310 ≥38 D=0a >2.5-3.0 ≤290 ≥300 ≥38 D=0a >3.0-4.0 ≤290 ≥300 ≥40 D=1/2a Note: 1. The tensile test and bending test listed in the table are applicable to longitudinal specimens
2. The tensile test adopts L0=50 mm, b=25 mm specimens
3. The bending test sampling plan should be carried out in accordance with JIS Z 2204 No. 3 sample, and the test method should be carried out in accordance with JIS Z 2248
4. The hardness test is performed in accordance with JIS Z 2245
5. The target value of hardness HRB is 60±8. The actual value is provided in the warranty, but not as an acceptance requirement.
Surface quality
1 The surface of the steel plate or steel belt is not allowed to have inclusions, cracks, corrosion and other defects harmful to use, and no parking spots are allowed. Defects that do not affect the molding performance are allowed, such as slight scratches without hand feeling, light yellow film after pickling, slight pitting, scratches, roll marks and indentations, color difference and slight wrinkles without hand feeling, etc.
2 Since the steel strip has no chance to remove the defect, it is allowed to deliver with the defect, but the defective part shall not exceed 6% of the total length of the steel coil.
3 Oiling means that the surface of the steel plate is coated with an electrostatic anti-rust oil with certain anti-rust properties. The oiling is divided into light oil, medium oil, and heavy oil, which shall be specified in the contract by the purchaser. The supplier of oil-coated products shall ensure that there is no rust within 3 months under normal transportation and storage conditions. Hot continuous rolling can be divided into ordinary carbon structural steel, low alloy steel, and alloy steel according to its material and performance.
