What features do A588 Grade C structural shapes have

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"BBN Steel Q345D hot rolled plates stock 202019.05*2050*10800, 27.5*3600*12000, 28.58*2172*12500, 48*3000*12813, 19.05*2185*12200, 22*3730*12100, 22.23*2080*12000, 55*1800*3200, 22.23*2178*12200, 24*2470*12800, 19.05*2187*12200, 27.5*3735*12000, 22.23*2181*12200, 59*2950*10000, 28.58*2171*12500, 16*1800*6860, 28.58*2172*12000, 16*1730*9500, 44*3000*5000, 14*1700*6970, 19*2185*11500, 14*1440*9700, 60*2950*10000(mm).

Compared with 15Cr steel, 20Cr alloy has higher strength and hardenability. The critical hardening diameter in oil is 4-22mm, and the critical hardening diameter in water is 11-40mm, but the toughness is poor. This A588 Grade C structural shapes alloy steel A588 Grade C structural shapes still has a tendency to grow grains during carburization, and direct quenching at lower temperature has a greater impact on impact toughness, so secondary quenching is required after carburization to improve the toughness of the core of the part, and there is no temper brittleness.

During the construction of hot-dip A588 Grade C structural shapes galvanized pipe, the correct welding process shall be adopted, the inspection and acceptance shall be carried out in strict accordance with the specification, and the anti-corrosion treatment (zinc rich paint) shall be done timely after the welding is completed. It is feasible in the construction process of open and closed air conditioning system, which can improve the A588 Grade C structural shapes construction speed and the firmness of the pipe connection. Therefore, the hot-dip galvanized pipe can be welded and connected under the construction conditions and on the premise of relevant protection and anti-corrosion measures.

Q235 is a kind of carbon steel. A588 Grade C structural shapes, Q235 steel is widely used in steel structure construction because of its good toughness, good plasticity, certain elongation, good welding performance and heating performance. Q235A steel plate contains C ≤ 0.22%, Mn ≤ 1.4%, Si ≤ 0.35%, S ≤ 0.050, P ≤ 0.045. Q235B steel plate contains C ≤ 0.20%, Mn ≤ 1.4%, Si ≤ 0.35%, S ≤ 0.045, P ≤ 0.045. Q235C steel plate contains C ≤ 0.17%, Mn ≤ 1.4%, Si ≤ 0.35%, S ≤ 0.040, P ≤ 0.040. Q235D steel plate contains C ≤ 0.17%, Mn ≤ 1.4%, Si ≤ 0.35%, S ≤ 0.035, P ≤ 0.035.

We should focus on the main problems to be solved and pay attention to efficiency. After receiving the user's quality objection report data, the possible causes, responsible units, compensation amount, etc. of the problem shall be judged based on experience. To have a clear service plan, to be clear about what your main problem is, what technical support is needed, these should be prepared.