Showing posts with label
Seamless steel pipe manufacturer.
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Showing posts with label
Seamless steel pipe manufacturer.
Show all posts
Quenching is the heat treatment process applied on metal. Heated the metal to a suitable temperature and hold for a certain time, then immersed in quenching medium and cooled immediately. In general, saline, water, mineral oil, air can be used as quenching medium. Quenching process is widely used in various engineering, mold, measuring tools and requirements of surface wear of parts ( such as gears, rollers, carburizing parts ect.). Because quenching can increase the hardness and wear resistance of metal parts. Quenching process has been widely used in modern machinery manufacturing industry. For those important mechanical parts, especially the metal parts applied on automotive, aircraft, rockets.
Generally, quenching and tempering will be applied together on the metal, by quenching and tempering with different temperatures can greatly improve the strength of the metal, fell toughness and fatigue strength, and to get fit ( mechanical properties) between the performance of these to meet different requirements. Further hardening can also make some special properties of steel to obtain certain physical and chemical properties, such as hardened steel reinforcing its permanent magnet ferromagnetic stainless steel to improve its corrosion resistance.
Quenching process is mainly used for steel parts, when steel heated to above the critical temperature, the original organization of steel turned into austenite ( all or most of). Then the steel will be immersed in water or oil rapidly cooling, and the austenite turned into martensite. Compared with other organizations in steel, martensite has highest hardness. Rapid quenching cooling causes internal stress generated. When it to a certain extent, the steel might be distortion or cracking. Therefore, the right method of cooling is significant.
For more manufacturing news, please read What is Annealing?, What is Tempering?, The difference between Annealing and Tempering
According to different production methods, seamless steel pipe can be divided into hot-rolled pipes, cold rolled pipes, cold drawn tubes. Between hot rolled seamless pipes and cold drawn seamless steel pipe, the big difference is that cold drawn seamlss steel pipe has a high precision than hot rolled seamless steel pipe which is preferred machining manufacturing and parts manufacturing. Also, the common type of seamless steel pipe can be very rough cast for support greater pressure. However, for cold drawn seamless steel pipe, it has smaller outer diameter, higher precision, good surface quality, high accuracy. Therefore, cold drawn seamless steel pipe has superior performance.
Cold drawn seamless steel pipe is generally applied in mechanical structure, hydraulic equipment which requires good surface finish steel tube. Using cold drawn seamless tube manufacturing mechanical structure or hydraulic equipment can grately reduce machining time, improve material utilization and improve product quality.
The production range for cold drawn seamless steel pipe: Outside Diameter: 5mm ~ 200mm, Wall Thickness: 2.5mm ~ 12mm.
The basic production steps for cold drawn seamless steel pipe are:
1. pipe material supply (use tube feeding tubes or semi-finished hot rolled tubes, squeeze tubes and welded pipes.)
2. pipe material prepeartion, including inspection, compactors, acid washing, cleaning, washing, drying, coating lubricants.
3. cold drawn
4. finished including finished heat treatment, straightening, sampling, cut head and tail, checking, hydrosatic tesing, oiling, packaging, warehousing and so on.
For more product information about seamless steel pipe, please read GB/T81625 Seamless Steel Pipe
