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The tensile strength of seamless steel pipe is more than 8-10 times of that of ordinary steel, and its elastic modulus is better than that of steel, with excellent creep resistance, corrosion resistance and seismic resistance; the mechanical performance of seamless steel pipe is excellent, easy to machine, etc.; the seamless steel pipe A588 Grade A A588 Grade B A588 Grade K strucutural steel is highly elastic, reused in mechanical equipment, memoryless, deformation free, and antistatic.
The prices of cold rolled sheets and coils products across the country have been on the rise and fall as a whole. On the supply side, the weekly output of cold rolling was basically the same month-on-month, the factory inventory increased slightly, and the social inventory continued to increase. In terms of the market, the national cold-rolled coil prices this week showed a mixed trend. According to local market feedback, as the Spring Festival approaches, the market will have holidays one after another, and the overall transaction has shown a downward trend.
The sulfur element (S element) comes from the ore and fuel coke of steelmaking. It is a harmful element in A588 Grade A A588 Grade B A588 Grade K strucutural steel etc. steel. Sulfur exists in steel in the form of iron sulfide (FeS). FeS and Fe form a low melting point (985℃) compound. The hot working temperature of steel is generally above 1150 - 1200℃, so when the steel is hot working, the premature melting of FeS compound causes the workpiece to crack, which is called "hot brittleness". It reduces ductility and toughness of steel and causes cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance.
After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the spread and development of rust and protects the substrate under the rust layer to slow down its corrosion rate. The amorphous spinel-type oxide layer with a thickness of about 50μm-100μm formed between the rust layer and the substrate is dense and has good adhesion to the substrate metal.