Steel: It is a material made of ingot, billet or steel by pressure processing into various shapes, sizes and properties required.
Steel is an essential material for national construction and the realization of the four modernizations, widely used, wide variety, according to the different section shape, steel is generally divided into profiles, plates, pipes and metal products four categories, in order to facilitate the organization of steel production, order supply and do a good job of management work, It is also divided into heavy rail, light rail, large steel, medium steel, small steel, steel cold-formed steel, high-quality steel, wire, medium thickness steel plate, thin steel plate, electrical silicon steel sheet, strip steel, seamless steel pipe steel, welded steel pipe, metal products and other varieties.
Materials must be determined according to the needs of the facility, different uses will have different answers, no matter what kind of steel as long as it can be used in suitable for its facilities is the best steel, for example, for builders, can adapt to the environment, high strength and low price steel is the best, so building developers like to use carbon steel; For decoration manufacturers, beautiful and generous, easy to handle, low-cost steel is the best, so they like to use steel; For military enterprises, they like to use high strength, high hardness, toughness, to meet the special purpose of the steel, so choose special alloy steel.
A steel brand product can not be competent for all purposes of the knife, such as the size of the large machete and small pocketknife steel requirements are much worse, diving knives and knives used in dry environments are not the same, simply say what kind of steel is best and best that is very superficial, there is no best steel, only for a certain purpose of the knife to have the best steel, And the quality of the knife is not all in the steel, heat treatment accounts for half or more of the importance, heat treatment is the soul of steel.
1. Shoddy steel is prone to folding. Folding is a variety of broken lines formed on the steel surface, and this defect often runs through the longitudinal side of the entire product. The reason for folding is because the shoddy manufacturers pursue high efficiency, the amount of pressure is too large, the ear is produced, the next rolling will fold, the folded product will crack after bending, and the strength of the steel will decrease. 2. Shoddy steel often has a pockmarked appearance. Pitted surface is the irregular uneven defect of steel surface caused by severe groove wear. As shoddy steel manufacturers to pursue profits, there are often excessive groove rolling.
3. The surface of shoddy steel is prone to scarring. There are two reasons: a. The fake steel material is not uniform, and there are many impurities. b. shoddy materials manufacturers guide equipment is simple, easy to stick steel, these impurities bite the roll is easy to produce scars.
4. The surface of shoddy materials is prone to cracks, because its billet is adobe, adobe porosity, adobe in the cooling process due to the action of thermal stress, cracks after rolling.
5. Shoddy steel is easy to scratch, the reason is that shoddy steel manufacturers have simple equipment, easy to produce burrs, scratch the steel surface. Deep scratching reduces the strength of steel.
6. Shoddy steel has no metallic luster, is light red or similar to the color of pig iron, for two reasons, its billet is adobe. 2, the rolling temperature of shoddy materials is not standard, their steel temperature is visually measured, so that it can not be rolled according to the prescribed austenitic area, the performance of steel naturally can not meet the standard.
Seven. The transverse bar of shoddy steel is thin and low, and the phenomenon of filling is often dissatisfied, because the manufacturer in order to achieve a large negative tolerance, the pressure of the first few passes of the finished product is too large, the iron shape is too small, and the pass shape is not satisfied.
Post time: Nov-29-2023