Storage hoisting
4.1.1 Storage of stainless steel parts: special storage racks should be provided. The storage racks should be wooden or painted carbon steel brackets or cushions with rubber pads to isolate them from carbon steel and other metal materials. When storing, the storage location should be convenient for hoisting, relatively isolated from other material storage areas, and protective measures should be taken to avoid contamination of stainless steel by dust, oil, and rust.
4.1.2 Stainless steel parts hoisting: when hoisting, special hoisting tools, such as hoisting belts, special chucks, etc., should be used. Wire ropes are strictly prohibited to avoid scratching the surface; and when hoisting and placing, avoid impacts and scratches caused by scratches.
4.1.3 Transportation of stainless steel parts: during transportation, transportation tools (such as trolleys, battery carts, etc.) should be used, and isolation and protection measures should be taken to prevent dust, oil, and rust from polluting the stainless steel. Procrastination is strictly prohibited to avoid bumps and scratches.
Processing
4.2.1 Processing area: The processing area of stainless steel parts should be relatively fixed. Isolation measures should be taken for the platform of the stainless steel processing area, such as laying rubber mats. The fixed management and civilized production of the stainless steel parts processing area should be strengthened to avoid damage and pollution to the stainless steel parts.
4.2.2 Cutting: The cutting of stainless steel parts adopts shearing, plasma cutting, sawing, etc.
⑴Cutting: When cutting, it should be isolated from the feeding support, and the drop hopper should also be covered with rubber pads to avoid scratches.
⑵Plasma cutting: After plasma cutting, the cutting slag should be cleaned up. When batch cutting, the completed parts should be cleaned up in time to avoid contamination of the workpiece by cutting slag.
⑶ Sawing and cutting: When sawing and cutting, the clamping should be protected by rubber, and the oil and residue on the workpiece should be cleaned after sawing.
4.2.3 Mechanical processing: The stainless steel parts should also be protected during machining such as turning and milling. After the operation, the oil stains, iron filings and other sundries on the surface of the workpiece should be cleaned up.
4.2.4 Forming processing: Effective measures should be taken to avoid scratches and creases on the surface of stainless steel parts during the rolling and bending process.
4.2.5 Riveting welding: When assembling stainless steel parts, compulsory assembly should be avoided, especially flame roasting assembly should be avoided. If plasma cutting is used temporarily during the assembly or production process, isolation measures should be taken to avoid contamination of other stainless steel parts by cutting slag. After cutting, the cutting residue on the workpiece should be cleaned up.
4.2.6 Welding: Before welding stainless steel parts, oil, rust, dust and other debris must be carefully removed. When welding, use argon arc welding as much as possible. When using manual arc welding, use small current and fast welding to avoid swinging. It is strictly forbidden to ignite the arc in the non-welded area, and the ground wire is located in an appropriate position and connected firmly to avoid arc scratches. Anti-spatter measures (such as white ash, etc.) should be taken during welding. After welding, use a stainless steel (no carbon steel) flat shovel to thoroughly clean the slag and spatter.
4.2.7 Multi-layer welding: In multi-layer welding, the slag between layers must be removed. When multi-layer welding, the temperature between layers should be controlled, generally not exceeding 60°C.
4.2.8 Welds: weld joints should be ground. The surface of the welds shall not have defects such as slag, pores, undercuts, splashes, cracks, lack of fusion, and lack of penetration. The welds and base materials shall be smoothly transitioned and shall not be low. In the base material.
4.2.9 Orthopedics: For the orthopedics of stainless steel parts, flame heating methods should be avoided, in particular, repeated heating of the same area is not allowed. When orthopedic, try to use mechanical devices, or hammer with a wooden hammer (rubber hammer) or a rubber pad, and it is forbidden to hammer with an iron hammer to avoid damage to the stainless steel parts.
4.2.10 Handling: When handling stainless steel parts during processing, transportation tools (such as trolleys, battery carts or cranes, etc.) should be used, and isolation and protection measures should be taken to prevent dust, oil, and rust from polluting the stainless steel. It is strictly forbidden to drag directly on the platform or the ground, and it is strictly forbidden to bump and scratch.
Surface treatment
4.3.1 Cleaning and polishing: If there is any damage, it should be polished, especially scratches and splashes caused by contact with carbon steel parts, and damage caused by cutting slag must be carefully and thoroughly cleaned and polished.
4.3.2 Mechanical polishing: Use appropriate polishing tools for polishing, requiring uniform and consistent treatment, and avoid over-polishing and re-scratching.
4.3.3 Degreasing and dust removal: Before pickling and passivation of stainless steel parts, oil, oxide scale, dust and other sundries must be removed according to the process.
4.3.4 Water blasting treatment: According to different treatment requirements, choose different micro glass beads, different process parameters, and avoid over-spraying.
4.3.5 Pickling passivation: The pickling passivation of stainless steel parts must be passivated in strict accordance with the process requirements.
4.3.6 Washing and drying: After pickling and passivation, neutralization, washing and drying should be carried out strictly according to the process to thoroughly remove the residual acid.
4.3.7 Protection: After the surface treatment of stainless steel parts is completed, protection should be done to avoid secondary pollution from touching by personnel, oil, dust and other sundries.
4.3.8 Avoid reprocessing: After finishing the surface treatment of stainless steel parts, avoid reprocessing the parts or products.
Including: surface treatment of stainless steel/low carbon steel products such as chemical tankers, storage tanks, pipeline boilers, such as grinding/polishing, pickling/passivation, inspection/supervision, technical consultation, etc.
The main service targets are shipbuilding, petrochemical and food equipment industries.