seamless steel pipe production process production

Large-diameter seamless steel pipe production process production line characteristics and the manufacturing and testing equipment

(1) production line characteristics

The world's largest short-process hot-rolled seamless steel pipe production line, both high-volume production operations to meet the small batch production of multi-standard, especially for the manufacture of small diameter thick wall pipe and large diameter thin-walled tube has a unique solutions currently produce seamless steel pipe outside diameter thickness ratio (D / T) 4 to 50.

(2) manufacturing equipment

Perforation production line, can be quick-change head device, tool and die replacement high efficiency, which can meet complex specifications and quantity requirements.? pipeline 800A puncher can be one or more rolling expand the production of large diameter thin-walled steel pipe, the largest to? 914mm. 2000t large drawing machine, cold drawing specifications can be achieved? 940mm. By cold drawing process to improve the steel pipe wall thickness and outer diameter accuracy, suitable for the production of large diameter thin-walled high-grade steel products and four pipeline precision internal diameter tube.? 6.6 three-roll sizing mill, to be completed by a heated rolling line sizing operations;? 680 six-roller straightening machine? 960 ten roller straightening machine, 2000t pressure straightening machine, using various means to ensure that the steel pipe straight improve the level of external quality.

(3) heating and heat treatment equipment

LPG (liquefied petroleum gas) trolley-style back to the stove, the temperature control accuracy of ± 7 ° C, SIEMENS electronic burner control module, uniform heating, the temperature gradient, high-quality heat treatment; tube furnace, the diameter to 35000mm continuous heating of large quantities of blank roller hearth furnace with automatic temperature control, the joint? 800A punch to achieve continuous production; step-tube furnace, trolley tube furnace.

(4) detection equipment

Non-destructive testing line, UT, ET, MT detection. Import probe, high detection sensitivity, to ensure that the steel internal defects are not to be missed. Instrumented impact testing machine, oxygen and nitrogen analyzer, carbon and sulfur analyzer and other advanced equipment. Specialized sample processing plant, and the supporting equipment, sampling all the cold sawing means to ensure the credibility of test results. Lasting high temperature testing machine, P91, P92 high temperature lasting performance test.

4.2 P91 assessment conclusions

Trial? 508 × 75 domestic P91 large Mild Steel Pipe diameter steel pipe, test evaluation conclusions are as follows

Steel surface quality, dimensional accuracy, non-destructive testing, chemical composition, the conventional mechanical properties, high temperature tensile, microstructure, grain size, low power and non-metallic inclusions are in line with ASME SA335 "seamless ferritic alloy for high temperatures Steel Pipe ", GB5310-1995 high-pressure boiler seamless steel pipe standard, the impact value of 20 ° C to -30 ℃ the series are maintained at a high level.