Cold drawn seamless steel tube process
Round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold rolled) → blank tube → heat treatment → straightening →hydrostatic testing (testing) → mark → storage.
Benefits of Cold Drawn Seamless Steel Tubing
Cold drawn seamless pipes are seamless steel pipes with a circular cross-section made by cold drawing . Its name refers to the shape of steel pipes, such as thick-walled cold-drawn seamless pipes, thin-walled cold-drawn seamless pipes, etc. Cold drawn seamless pipes are widely used in the production of various structural parts, tools and mechanical parts. Compared with round pipes, cold drawn seamless pipes generally have larger moments of inertia and section modulus, have greater torsion resistance, save materials, and improve efficiency. They can be directly processed without deep processing in factories or mechanical processing plants. Use, reduce workload, improve work efficiency, and be loved by terminal demand.
Cold drawn seamless steel tubing provides a better uniformed OD and ID, enhanced machinability, increased strength, and tighter tolerances compared to hot finish seamless products.
Superior surface finish
High yield strength
Dimensional accuracy and excellent micro-structure uniformity
Enhanced machinability
High strength to weight ratio
Tight tolerances, resulting in reduced machine time
Possible spiraling eccentricity inherent in product
Cold Drawn Seamless Mechanical Tubing
Rolling hard roll can be used as the raw material of the hot-dip galvanizing plant, hot dip galvanizing line set annealing line. Rolling hard roll weight is generally 6 to 13.5 tons, the coil diameter of 610mm.
Condition on delivery:
Term
Symbol
Explanation
Cold-finished/hard(cold-finished as-drawn)
BK
No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft(lightly cold-worked)
BKW
After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed
GBK
After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized
NBK
The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.
Seamless steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported with a circular tube.
Cold drawn seamless steel pipes are widely used in automobiles, motorcycles, electric vehicles, petrochemicals, electric power, ships, aerospace, bearings, pneumatic components, seamless steel pipes for medium and low pressure boilers, etc. It can also be applied to steel sleeves, bearings, hydraulics, etc. Mechanical processing and other fields!
Storage requirements for cold drawn seamless steel pipes:
7. The warehouse is required to always maintain a suitable storage background, pay attention to ventilation in sunny days, and close it to prevent moisture in rainy days.
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