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High Precision Small Diameter High Pressure Seamless Steel T

High-precision small-caliber high-pressure seamless steel pipe in the hydraulic system, diesel fuel system has been widely used. At present, cold-rolled or cold-drawn tubes are generally used to manufacture high-precision small-diameter high-pressure seamless steel tubes. Although the technical requirements can be met, the following problems still exist: the cold drawing process inevitably leads to high production efficiency Compared with the cold rolling process, the compressive ability of the fabricated steel pipe and the quality of the inner and outer surfaces are relatively low. However, although the cold rolling process can increase the densification of the material and the surface quality is good, High dimensional accuracy, but there is the problem of low production efficiency, especially for small-diameter steel, to be cold rolled 2-3, in order to achieve the required technical requirements, it is difficult to meet the needs of efficient production. To this end, the author proposed a high production efficiency, good quality, high dimensional accuracy, suitable for small diameter high pressure seamless steel pipe manufacturing process, and achieved good results.
 
1 manufacturing process: capillary pretreatment → cold rolling → oxygen-free bright annealing → preconditioning → shrinking → cold drawing → anaerobic bright heat treatment → straightening and truncation → non-destructive testing → surface treatment. High-precision small diameter high-pressure seamless steel pipe manufacturing process, it is mainly for the diameter of Φ15 mm ~ Φ30 mm of the capillary, pretreatment, cold-rolled, anaerobic bright annealing, re-pretreatment, Anaerobic bright heat treatment, straightening and truncation, non-destructive testing and surface treatment and other technical measures.
Specific steps are as follows:
(1) pickling, phosphating, saponification treatment on the diameter of Φ15mm ~ Φ30mm capillary.
(2) cold rolled steel l after pretreatment.
(3) will be after a cold-rolled small diameter seamless steel tube oxygen-free bright annealing.
(4) after the oxygen free bright annealed steel pipe again pickling, phosphating, saponification treatment.
(5) After the non-oxygen bright annealing and pretreatment of seamless steel pipe before the cold drawing of the first processing.
(6) After the first processing of seamless steel pipe 1 to 3 continuous cold drawing, drawing the number of channels according to the amount of material allowed to reduce the diameter, and determine the size according to the diameter of the cold drawn short Core mold.
(7) of the cold drawn steel oxygen-free bright normalizing or stress relief annealing.
(8) After heat treatment of steel straightening and truncation.
(9) Non-destructive testing of straightened and truncated steel pipes.
(10) Zinc-plated, army-green passivated or black-plated small-diameter steel tubes that are flaw-free and flaw-proof.
2 Conclusion
The cold-rolling process and cold drawing process are combined organically to give full play to cold-rolled process can increase the density of the material, the surface quality is good, the advantages of high dimensional accuracy, but also to maintain the cold drawn high production efficiency advantages; especially For high-precision, small diameter, high pressure seamless steel pipe manufacturing has significant economic and social benefits.

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