Thick-walled seamless steel tube short process casting and squeezing continuous formation method

A technology of seamless steel pipe and short process, applied in the direction of casting mold composition, casting molding equipment, casting mold, etc., can solve the problems of material and energy waste, and achieve the effects of energy saving, mechanical performance improvement, and material utilization rate improvement

Inactive Publication Date: 2013-04-24
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the serious technical problem of material and energy waste existing in the existing method for producing large-diameter thick-walled seamless steel pipes, and to provide a method for continuous forming of thick-walled seamless steel pipes by short-flow casting and extrusion, which can effectively Save material, energy and increase productivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for continuous forming of thick-walled seamless steel pipes by short-flow casting and extrusion in this embodiment, which includes the steps of alloy melting - molten steel refining - riser casting ring billets - hot extrusion - heat treatment - precision shaping steps; the molten steel Refining is carried out in an intermediate frequency induction furnace, adding 1% nodulizer, the nodularization temperature is 1500°C, and the smelting temperature is 1650°C; the riser casting ring billet is refined by refining molten steel at 1590°C~1610°C The neck riser is poured, and the mold is released at 1300°C after the pouring is completed; the hot extrusion is to place the cast hollow ring billet on a vertical steel pipe extruder, and the inner surface of the cast hollow ring billet is coated with lubricant, and the waste heat of the cast billet is used to Extrusion is carried out directly at the initial extrusion temperature of 1250°C, the extrusion speed of the steel p...

Embodiment 2

[0016] A method for continuous forming of thick-walled seamless steel pipes by short-flow casting and extrusion in this embodiment, which includes the steps of alloy melting - molten steel refining - riser casting ring billets - hot extrusion - heat treatment - precision shaping steps; the molten steel Refining is carried out in an intermediate frequency induction furnace, adding 1% nodulizer, the nodularization temperature is 1500°C, and the smelting temperature is 1700°C; the riser casting ring billet is refined by refining molten steel at 1590°C~1610°C The neck riser is poured, and the mold is released at 1280°C after the pouring is completed; the hot extrusion is to place the cast hollow ring billet on a vertical steel pipe extruder, coat the inner surface of the cast hollow ring billet with lubricant, and use the waste heat of the cast billet to Extrusion is carried out directly at the initial extrusion temperature of 1200°C, the extrusion speed of the steel pipe extruder ...

Embodiment 3

[0018] A method for continuous forming of thick-walled seamless steel pipes by short-flow casting and extrusion in this embodiment, which includes the steps of alloy melting - molten steel refining - riser casting ring billets - hot extrusion - heat treatment - precision shaping steps; the molten steel Refining is carried out in an intermediate frequency induction furnace, adding 1% nodulizer, the nodularization treatment temperature is 1500°C, and the smelting temperature is 1680°C; the riser casting ring billet is refined by refining molten steel at 1590°C~1610°C The neck riser is poured, and the mold is released at 1330°C after the pouring is completed; the hot extrusion is to place the cast hollow ring billet on a vertical steel pipe extruder, and the inner surface of the cast hollow ring billet is coated with lubricant, and the waste heat of the cast billet is used to Extrusion is carried out directly at the initial extrusion temperature of 1230°C, the extrusion speed of t...

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Abstract

The invention relates to a thick-walled seamless steel tube short process casting and squeezing continuous formation method, and belongs to a short process casting and squeezing continuous formation method for producing large-caliber thick-walled seamless steel tubes, aiming at solving the technical field of severe material and energy source waste of the existing method for producing heavy-caliber thick-walled seamless steel tubes. The technical scheme provided by the invention is that the thick-walled seamless steel tube short process casting and squeezing continuous formation method comprises the steps of alloy melting, steel liquid refining, dead head loop blank pouring, hot extrusion, heat treatment and refine shaping step; a medium-frequency induction electric furnace is adopted for liquid steel refining, and the metallurgy temperature is 1650 DEG C-1700 DEG C; the step of dead head loop blank pouring is realized in a way that refined liquid steel is subjected to thin neck dead head pouring at 1590 DEG C-1610 DEG C, and molds are extruded out at 1280 DEG C-1330 DEG C after pouring; and the step of hot extrusion is realized in a way that the cast hollow loop blanks are placed on a steel tube extruding machine and are directly extruded and formed at the initial extrusion temperature of 1200 DEG C-1250 DEG C by utilizing residual heat of cast blanks, and the extrusion ratio is 10-12.

Description

technical field [0001] The invention relates to a short-flow casting extrusion continuous forming method for thick-walled seamless steel pipes, which belongs to a short-flow casting-extrusion continuous forming method for producing carbon steel, alloy steel and stainless steel large-diameter thick-walled seamless steel pipes. Background technique [0002] With the rapid development of my country's nuclear power, wind power, petroleum, aerospace, military, high-speed rail and other industries, the requirements for large-diameter thick-walled seamless steel pipes for construction, giant cast pipe molds and large complex parts are becoming more and more extensive. The traditional seamless steel pipe production process is: alloy melting → molten steel refining → pouring ingot → upsetting → punching → heating → hot extrusion → heat treatment → precision shaping, this method is not only tedious but also wastes materials and energy Seriously, the increase in ring oxide skin caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/08B22C9/24
Inventor 李永堂贾璐付建华
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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