QUALITY CONTROL

 Finished Product Testing
First-line fast inspection: routine items such as appearance, size, and hardness.
Laboratory deep inspection: ICP spectrometer and carbon-sulfur analyzer detect composition and performance.
Stricter than national standards: The internal control standards of key indicators are 10%-15% higher than national standards.

The core element content benchmark values ​​such as chromium (Cr), silicon (Si), and manganese (Mn) are strictly locked, and the error range is controlled within ±0.05%; during the smelting process, the element ratio is automatically calibrated every 10 minutes by the spectrometer to ensure that the composition fluctuation is lower than the industry standard of 30%; the rapid detection at the production site and the ICP deep analysis of the independent laboratory are double-verified to eliminate systematic deviations.

The vacuum decarburization technology is used to accurately control the carbon content in the range of 0.03%-0.15% (depending on the product type), which is more than 50% lower than the ordinary process; in terms of impurity control, sulfur (S) ≤0.015%, phosphorus (P) ≤0.025%, nitrogen (N) ≤50ppm, equipped with carbon sulfur analyzer and oxygen nitrogen hydrogen analyzer for targeted detection, and the raw materials exceeding the standard are directly melted and returned to the furnace.

The particle size is implemented in a pyramid model, with 100% of the basic grade passing through a 20-mesh screen, 90% of the precision grade concentrating on 40-60 mesh, and 70% of the ultra-fine grade reaching above 100 mesh; the appearance is tested in five dimensions, including color difference ΔE≤1.5, surface finish Ra≤0.8μm, zero cracks/pores/inclusions and other defects, dimensional tolerance ±0.5mm/±1°, and vacuum aluminum foil bags + moisture-proof cartons are used for protection, with a transportation damage rate of <0.01%.