Hebei CBIES Automotive Parts Co., Ltd. is one of the reliable manufacturers and suppliers in China. As a specialized factory, we focus on manufacturing cold-drawn welded tubes with consistent quality, competitive pricing, and reliable supply for global markets.
CBIES uses cutting-edge technology with three cold-drawing machines to significantly improve production efficiency and minimize material waste. The precision steel tubes produced by this process have impeccable dimensional accuracy, excellent tensile strength, outstanding inner surface smoothness and extraordinary straightness. The inner surface roughness is strictly controlled within Ra≤0.4μm, the outer diameter tolerance is accurate to ±0.03mm, and the tube straightness does not exceed 0.5mm/m, ensuring the high quality and reliability of the product.
CBIES' production standards comply with international standards such as EN, DIN, ASTM, JIS, GB, etc., with an outer diameter range of 8-127mm, which can meet various high-demand application needs.
Tolerance requirements
1. The inner surface roughness is strictly controlled within Ra≤0.4μm to ensure the surface is smooth and new.
2. The outer diameter tolerance is maintained at ±0.03mm to achieve precise specifications
3. The pipe straightness is guaranteed not to exceed 0.5 mm/m
4. The production standards comply with EN, DIN, ASTM, JIS, GB
Experiment and inspection
1. Three-coordinate detection;
2. Dimension tolerance detection;
3. Surface detection;
4. Performance detection;
5. Bending and flattening detection;
1. Strict dimensional accuracy: The outer diameter tolerance is accurate to ±0.03mm, and the inner surface roughness is controlled within Ra≤0.4μm, ensuring extremely high dimensional accuracy and surface finish.
2. Steel strength tensile yield value: Precision cold drawing process improves the tensile yield strength of welded tubes
3. Extreme straightness control: The straightness of the tube is controlled to no more than 0.5 mm/m, ensuring the stability and accuracy of the product in application and meeting high-demand engineering standards.
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