Production method of hot-rolled seamless steel pipes

Abstract

The invention discloses a production method of hot-rolled seamless steel pipes. The production method comprises the following steps: heating a steel billet in a heating furnace; perforating the steel billet into a hollow billet by using a perforating machine; rolling pipes and extending; sizing and reducing; thermally sawing and cutting; cooling by using a cooling bed; straightening by using a straightening machine; sawing the heads and the tails of the steel pipes to saw the steel pipes into required lengths; checking and accepting, and completing production of finished products of seamless steel pipes. According to the production method of the hot-rolled seamless steel pipes, the shortcomings and the defects that the hot-rolled seamless steel pipe manufacturing process in the prior art can only achieve single-length production, the production efficiency is low, the yield is low, and the productivity improvement of a production line is restricted are overcome; upgrading and transformation from single-length production to double-length or multi-length production are achieved; and the production method of the hot-rolled seamless steel pipes has the advantages of small cutting loss, high yield, low unit product manufacturing cost and high production line productivity.

Description

technical field [0001] The invention belongs to the technical field of metal thermal processing technology, and more specifically relates to a production method of a hot-rolled seamless steel pipe. Background technique [0002] The production of hot-rolled seamless steel pipes is generally divided into three steps: piercing, rolling, and diameter reduction, such as figure 1 As shown, the specific process steps include: heating the steel billet in the heating furnace → using a piercer to perforate the steel billet into a capillary tube → rolling the tube and extending it → sizing and reducing → cooling, straightening → sawing the head and tail of the steel pipe (sawing into the required length)→flaw detection, testing→measurement, marking→production of finished seamless steel pipes. [0003] The prior art seamless steel pipe manufacturing process has the following disadvantages in the entire manufacturing process from billet to finished product: ① due to the limitation of th...

AI Technical Summary

Problems solved by technology

[0003] The prior art seamless steel pipe manufacturing process has the following disadvantages in the entire manufacturing process from billet to finished product: ① due to the limitation of the production process, only single-length or shorter fixed-length double-length production can be realized; ② sawing The head and tail of the cut steel pipe are long, the metal consumption is large, and the finished product rate is low; ③The unit finished product manufacturing cost is high; ④The capacity increase is limited

Images