304 stainless steel decorative pipe
stainless steel decorative pipe:
1. Uniform wall thickness: The base material is made of molding tape, with good wall thickness consistency and high surface roughness.
2. Low residual stress: the formed steel pipe should be brightly annealed at a high temperature above 1040℃.
3. High welding seam strength: After high-temperature heat treatment, the welding seam has the same intergranular structure as the base metal. When the welding seam is tested for damage such as straight, bend, and flaring, no welding seam cracks, burrs, etc. will occur .
4. Good consistency: the outer diameter, wall thickness, length, and straightness of the decorative tube are consistent, and the processing accuracy is high.
stainless steel seamless pipe:
Advantages: fast forming speed, high output, can be made into a variety of cross-sectional forms to meet the needs of use conditions; cold rolling can cause large plastic deformation of steel, thereby improving steel Yield point. Hot rolling can destroy the ingot structure, refine the particles, eliminate defects, make the steel structure dense, and improve the mechanical properties of the steel.
Disadvantages:
1. Metal layer: After the steel pipe is cold rolled, the non-metallic inclusions (mainly sulfides, oxides, and silicates) in the steel are pressed into thin sheets to form a layer (interlayer). The existence of the layered structure deteriorates the stress performance of the steel in the thickness direction, and interlayer tearing may occur during the welding process.
2. Uneven wall thickness: As we all know, metals have thermal expansion and contraction, because at the end of rolling, cold-rolled steel pipes will eventually produce a certain negative difference even if the length and thickness reach the standard. This negative difference The larger the , the worse the uniformity of the wall thickness. Therefore, the requirements for wall thickness, length, straightness and ovality of cold-rolled seamless steel pipes cannot be too precise.
3. Residual stress: Due to uneven cooling, various cross-section steel pipes have residual stress. The larger the cross-sectional size of the steel, the greater the residual stress. When subjected to external forces, it will have a certain impact on the performance of the steel pipe. For example, it has adverse effects on deformation, stability, fatigue resistance, etc.
4. Poor surface quality: longitudinal distribution of pull marks on the inner surface of the steel pipe,Symmetrical or single-line folds, some are long and some are partial.
Understand the above situation and understand the difference between stainless steel decorative pipe and seamless pipe. In recent years, with the rapid development of high-quality stainless steel continuous rolling production and the advancement of stainless steel welding inspection technology, welding quality has continued to improve, and the types and specifications of welded stainless steel decorative pipes have continued to increase. Many products can replace stainless steel seamless pipes.
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