Every after-sales service shall have a detailed record of the customer's product problems and handling methods. The records shall be sorted into volumes and filed on a monthly basis, and submitted to the technical department for filing. The problems found in the after-sales service shall be summarized in a timely manner, discussed with the technical department, the quality inspection department and the production department, and a proper solution shall be proposed for the technical department to improve in a timely manner;
Both steelmaking and ironmaking are carried out by oxidation-reduction reaction, but there are great differences between them in reaction objects: ironmaking is to reduce iron, while Q345B schedule 40 pipe steelmaking is to remove excessive carbon and other impurities in pig iron, so there are relations and differences between them in actual operation. There are three main methods of Q345B schedule 40 pipe steelmaking: converter, electric furnace and flat furnace. The converter steelmaking process is most widely used.
S355MC hot rolled steel chemical composition (%)Carbon: ≤0.12, Manganese: ≤ 1.50, Phosphorus: ≤ 0.025, Sulfur: ≤ 0.020, Silicon: ≤0.50, Vanadium: ≤ 0.20, Titanium:≤ 0.15, Aluminum: ≥ 0.015Mechanical propertiesYield strength MPa: ≥380Tensile strength MPa: ≥450-590Elongation: ≥18
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