Spiral steel pipe development and main production methods
The proportion of spiral steel pipe in the steel pipe has stabilized in recent years at about 42% to 45%, with a rising trend of welded pipe. Spiral steel pipe compared with welded steel pipe is the reliability of the material and variety of adaptability, especially adapted to the production of thick-walled and alloy steel. The main problem is the high investment, high cost, complex manufacturing process, wall thickness and ovalness tolerance. The welded pipe is actually a deep-processed product of the plate, under the conditions of similar prices, the market competitiveness of spiral steel pipe because of its high reliability, with the continuous improvement of the quality of steel plate and welded pipe technology and equipment level, part of the market occupied by spiral steel pipe, there is the possibility of replacement by welded pipe, but this is only a very limited area.
Hot rolling process is the main manufacturing method of spiral steel pipe, accounting for 80% of the production of seamless pipe hot rolling mill unit production of variety and quality level in addition to the technical level of the mill itself, to a large extent by the smelting and continuous casting constraints, so the advanced process should refer to the complete process from smelting to pipe processing.
Spiral steel pipe development and the main production methods
Most of the internationally renowned spiral steel pipe enterprises are complete professional steel pipe mill or steel consortium, relying on the outsourcing of billet manufacturing spiral steel pipe enterprises are difficult to take a firm position in the fierce market competition. The use of electric arc furnace or converter smelting a LF furnace refining a VD vacuum treatment a fully protected casting continuous casting round billet a hot rolling mill (NPN, PQF) a tube processing, is today’s internationally advanced spiral steel pipe production process, the use of the above process can be produced such as special oil pipe, high pressure boiler pipe, low and medium alloy pipe.