Buried tank pump integrated constant pressure fire water supply equipment mainly consists of two parts: a fire pool and a fire pump room. Its box material is BDF composite module (0.4mm thick stainless steel plate and 3mm thick double galvanized steel plate composite plate). Buried box pump integrated constant pressure fire water supply equipment 304 stainless steel is a universal stainless steel material, and the rust resistance is stronger than the 200 series stainless steel material. It is also relatively good in terms of high temperature resistance, up to 1000-1200 degrees. 304 stainless steel has excellent stainless corrosion resistance and good intergranular corrosion resistance. For oxidizing acids, it was determined in the experiment that 304 stainless steel has strong corrosion resistance in nitric acid with a concentration of ≤ 65% below the boiling temperature. It also has good corrosion resistance to alkali solutions and most organic acids and inorganic acids. 304 stainless steel grade: 0Cr18Ni9 (0Cr19Ni9) 06Cr19Ni9 S30408 Chemical composition: C: ≤0.08, Si: ≤1.0 Mn: ≤2.0, Cr: 18.0~20.0, Ni: 8.0~10.5, S: ≤0.03, P: ≤0.035 N≤0.1. 304 is widely used, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good heat workability such as stamping bending, no heat treatment hardening phenomenon (no magnetic, use temperature -196°C~800°C). Stainless steel plate has a smooth surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions and other media. It is an alloy steel that is not easy to rust, but it is not rust-free. The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and the internal structure. Chromium plays a major role. Chromium has high chemical stability. It can form a passivation film on the surface of steel to isolate the metal from the outside world, protect the steel plate from oxidation, and increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases. Buried box pump integrated constant pressure fire water supply equipment galvanized sheet generally galvanized layer thickness requirement 3mm real galvanized layer is qualified at 2,75, too specific standards are not available, or the thickness required, galvanized C-shaped steel is generally made of galvanized strip, 275g/m2 is equivalent to 35 microns of galvanized layer thickness. As long as the average thickness meets the standard, it is qualified! 3mm galvanized C-shaped steel has no special rules on the thickness of the galvanized layer. The thicker the galvanized layer, the stronger the anti-corrosion ability, so different galvanized layer thicknesses should be selected according to the usage environment of C-shaped steel. Common brands generally make CZ type steel galvanized layer thickness 180g.200g.250g.275g, etc.