PETROL STEEL CO., LTD has established a quality system in strict accordance with the ISO9001 standard, and obtained a certificate through the audit of the certification center. Each department of the company strictly implements the requirements and requirements of quality documents and technical documents such as "Quality Manual" and "Procedure Documents", earnestly fulfills quality responsibilities, and effectively carries out various productions.
1. Cutting and cutting: Saw cutting according to the "Unloading Task List" strictly, and make inspection records, and batch cutting can be performed after passing.
2. Heating: Products of different materials and different furnace numbers cannot be heated in the same furnace.
3. Rolling or Forging: The operator performs forging according to the drawing. During the Rolling or forging process, an infrared thermometer is used to control the rolling or forging temperature of the forging.
4. Heat treatment: The thermocouples and temperature instruments are checked periodically. Strictly follow the process parameters and cooling methods such as the heating rate, heat preservation temperature, heat preservation time, etc. specified in the heat treatment process.
5. Machining: Processing according to the drawings, and mass production after the first inspection. During the process, the inspector conducts inspections and checks the processed products.
6. Inspection before packaging: The full-time inspector strictly inspects the machined product size, surface quality and logo according to the drawings, and then re-tests the product to prevent confusion.
7. Packaging process:
⑴ Typing: Type according to the typing notice in the "Production Task List". After the first self-inspection, the full-time packaging inspector performs the first inspection, and then performs batch typing after passing the inspection. The handwriting is checked for clarity during the process to ensure clear and neat typing .
⑵Anti-rust treatment: Anti-rust treatment (oil coating, spray painting, etc.) is performed according to customer requirements, the operator performs self-inspection as required, and the full-time packaging inspector performs first-item inspection, inspection, and process on the anti-rust treatment and surface quality as required. Inspection, qualified into the packing process, othERWise rework processing.
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