Mirror finishing of stainless steel products involves polishing and grinding equipment using high-quality oilstones, diamond paste, and sandpaper of varying specifications. A process of rough, medium, and fine grinding is performed to achieve a smooth, glossy surface.

1. Grinding
Grinding stainless steel welded parts aims to remove weld spots, laying the foundation for subsequent finishing, and achieving a surface roughness of R10µm. This process involves multiple steps, including rough, semi-fine, and fine grinding.

First, the workpieces entering the polishing process undergo a thorough visual inspection to ensure there are no defects—such as missing welds, weld penetrations, uneven weld depths, excessive deviation from the joint, localized depressions, and misaligned joints—that cannot be corrected in subsequent processes. Only if these defects are eliminated can the workpiece proceed to the polishing process.

During the rough grinding stage, we use a 600# abrasive belt to perform a reciprocating grinding motion on three sides of the workpiece. The goal is to remove weld spots and dents, initially create a fillet at the weld corner, and ensure that there are no large scratches or dents on the horizontal and vertical surfaces. Next comes semi-finish grinding. In this step, we use an 800# abrasive belt to grind the workpiece on three sides using the same rough grinding method. This step primarily corrects seams and fine-grinds any rough grinding marks, striving for a scratch-free, bright surface.

Finally, fine grinding uses a 1000# abrasive belt to correct fine grain lines introduced by the previous step. The goal is to virtually eliminate the seam between the ground and unground areas, further improving the surface finish to a near-mirror finish.

2. Polishing
After the aforementioned grinding steps, the workpiece surface has reached a roughness of R10um. Next comes polishing. This step aims to further improve the surface finish to a mirror-like finish. During polishing, we use specialized polishing equipment and materials to meticulously polish the workpiece, ensuring a smooth, flawless surface.

The polishing step further polishes the previously polished stainless steel workpiece to a mirror-like finish. This process primarily involves two steps: waxing and buffing. During the waxing process, we use a high-speed motor-driven wool wheel with large blue wax, mimicking the previous polishing method, to mirror-finish the polished workpiece. Please note that this step is intended to polish, not further grind. Care should be taken to ensure that the polishing wax does not come into contact with the workpiece's surface film to avoid damaging it.

Buffing is the final step in the mirror polishing process. We rub the workpiece surface with a clean cotton wheel to remove all traces of the previous process, leaving the surface clean and bright. The goal of this step is to eliminate visible weld marks and polish the waxed and polished areas to a brightness of 8k mirror reflectivity, with no noticeable difference between the polished and unpolished areas, thus achieving a complete mirror finish.

In addition, the standard waxing procedure is to wax the wool wheel before polishing, and then begin polishing after the wool wheel is fully adhered to the blue wax.

Answers

• 
  What is the complete process for mirror finishing stainless steel? 15/10/2025 15:37:59
• 
  Surface anti-corrosion coating of steel pipe? 15/10/2025 08:13:23
• 
  What are the specific categories of channel steel? 14/10/2025 16:22:03
• 
  What's the difference between high-frequency welded steel pipe and straight seam welded steel pipe? 13/10/2025 17:00:38
• 
  Composition of Pipeline Anticorrosion and Thermal Insulation Layers 13/10/2025 07:25:59