1. The difference in chemical composition between the two is that 304 has lower carbon content than 310 and higher nickel and chromium content.
2. Performance: 304 stainless steel pipe has better corrosion resistance and ductility than 310; 310 stainless steel pipe has higher hardness, so its wear resistance and fatigue strength are better than 304 stainless steel pipe.
3. Application: 310s stainless steel pipe is generally used for elastic purposes, such as making springs. 304 stainless steel pipe has good corrosion resistance and is generally used in food, kitchen and bathroom, water treatment, and other aspects.

Different production processes
The production processes of hot-dip galvanized steel sheet and galvanized steel sheet are different. Hot-dip galvanized steel sheet is to immerse the steel in molten zinc liquid, and after taking out, cooling, cleaning and other process steps, the zinc layer is fixed on the surface of the steel sheet to form a protective film, thereby achieving the effect of anti-corrosion. Galvanized steel sheet is electroplated by coating the surface of the steel sheet with zinc and then processed, painted, and other processes.

Different coating thickness
The thickness of hot-dip galvanized steel sheet is generally between 5-60μm, and its coating thickness is relatively uniform; while the thickness of galvanized steel sheet is generally between 5-25μm, and its coating thickness is uneven, which is easy to crack and chip when bending or cutting, affecting the appearance and anti-corrosion effect.

Different corrosion resistance
The corrosion resistance of hot-dip galvanized steel sheet is better than that of galvanized steel sheet. Because the coating of hot-dip galvanized steel sheet is uniform and dense, closely combined with the steel sheet substrate, it is not easy to fall off. At the same time, the density and purity of the surface zinc crystal are high, there are fewer impurities in the coating, and the corrosion resistance is strong. The coating of galvanized steel sheet is not dense enough and is easy to fall off, making it difficult to prevent corrosion for a long time.

Different mechanical properties
The mechanical properties of hot-dip galvanized steel sheet are slightly worse than those of galvanized steel sheet, mainly in terms of tensile strength and yield strength. Because the hot-dip galvanizing process will reduce the surface strength of the steel, the hot-dip galvanized steel sheet is slightly inferior to the galvanized steel sheet in terms of strength.

1. Mechanical removal: For rust spots on the surface, you can use tools such as sandpaper, wire brushes, or grinding wheels to remove them. Be careful not to over-grind to avoid damaging the stainless steel surface.

2. Chemical cleaning: You can use a special stainless steel cleaning agent for cleaning. Apply the cleaning agent to the rust spots, let it stand for a while, and then wipe it clean with a cloth. If the rust spots are heavy, you can heat the cleaning agent to a certain temperature to improve the cleaning effect.

3. Electrochemical rust removal: For more stubborn rust spots, you can use electrochemical rust removal. Connect the rust remover to the power supply, soak the rust spots in the rust removal liquid, and remove the rust spots after some time.

4. Polishing: For the stainless steel surface that has been rusted, you can polish it to restore its bright surface.

1. Chemical method
Use pickling paste or spray to assist the rusted parts to passivate again to form a chromium oxide film to restore its corrosion resistance. After pickling, it is very important to rinse with clean water properly to remove all pollutants and acid residues. After all treatments, re-polish with polishing equipment and seal with polishing wax. For local slight rust, you can also use a 1:1 gasoline and engine oil mixture with a clean rag to wipe off the rust.

2. Mechanical method
Sandblasting, cleaning with glass or ceramic particles, annihilation, brushing, and polishing. Mechanical methods may wipe off the pollution caused by previously removed materials, polishing materials, or annihilation materials. All kinds of pollution, especially foreign iron particles, may become a source of corrosion, especially in humid environments. Therefore, the mechanically cleaned surface should preferably be cleaned formally under dry conditions. The use of mechanical methods can only clean the surface and cannot change the corrosion resistance of the material itself. Therefore, it is recommended to re-polish with polishing equipment after mechanical cleaning and seal with polishing wax.