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Manufacturing method for G115 large-caliber thick-wall seamless steel pipe of 630 DEG C ultra-supercritical unit

A technology of an ultra-supercritical unit and a manufacturing method, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of low impact toughness and the like, and achieve the effects of improving impact toughness and saving production costs.

Active Publication Date: 2018-12-14
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low impact toughness has become a key technical problem for the industrialization of G115 large-diameter thick-walled seamless steel pipes
At the same time, relevant domestic units carried out some research on G115 steel and published some documents, such as the document "The influence of normalizing temperature on the structure and room temperature strength of G115 steel" (Journal of Materials Heat Treatment, Vol. 39, No. 1) studied the G115 steel The effect of normalizing temperature on the structure and room temperature strength, but these documents do not involve how to improve the impact performance

Method used

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  • Manufacturing method for G115 large-caliber thick-wall seamless steel pipe of 630 DEG C ultra-supercritical unit
  • Manufacturing method for G115 large-caliber thick-wall seamless steel pipe of 630 DEG C ultra-supercritical unit
  • Manufacturing method for G115 large-caliber thick-wall seamless steel pipe of 630 DEG C ultra-supercritical unit

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Experimental program
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Effect test

Embodiment 1

[0029] Specifications of finished steel pipe: 540mm×70mm×5000mm

[0030] 1. Raw material (forging billet / steel ingot) preparation

[0031] According to the patent of CN103045962B, one billet / steel ingot is prepared, and the ingot weighs 10 tons.

[0032] 2. Use a gas heating furnace to heat the steel ingot to 1140±10°C.

[0033] 3. Closed upsetting + reverse extrusion punching

[0034] Remove the oxide skin on the surface of the steel ingot, spray the glass lubricant on the surface, and then carry out closed upsetting in the billet press with an upsetting ratio of 1.56, reverse extrusion punching, and a perforation ratio of 1.1 to make a hollow billet.

[0035] 4. Extrusion

[0036] Heat the hollow billet to 1240±10°C, remove the oxide skin on the surface of the hollow billet and return to the furnace for 0.5 hours to make up for the temperature loss on the surface of the hollow billet. After spraying the glass lubricant, extrude the hollow billet into a tube billet on the ...

Embodiment 2

[0065] Embodiment 1 Other method steps remain unchanged, and the performance heat treatment in step 6 adopts quenching+tempering method to realize the present invention.

[0066] Quenching temperature: 1070°C±10°C, temperature equalization for 3 hours + heat preservation for 4 hours, water cooling, cooling to room temperature and then tempering.

[0067] Tempering temperature: 790°C ± 10°C, holding temperature for 3 hours + holding for 4 hours and then air cooling.

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Abstract

The invention relates to a manufacturing method for a G115 large-caliber thick-wall seamless steel pipe of a 630 DEG C ultra-supercritical unit, and belongs to the field of manufacturing of heat resistant steel pipes. In the method, for the long-term problem of weak impact toughness in production of the G115 large-caliber thick-wall seamless steel pipe, the following processes of preparation of araw material (forging stocks / steel ingots), closed upsetting, backward extrusion punching, extrusion moulding, heat treatment (rapid cooling and annealing) after extrusion and property heat treatmentare organically combined, and technological parameters of the patent CN103045962B are broken through, so that the impact toughness after heat treatment is performed on the steel pipe is greatly improved, and all properties can meet standard requirements of a T / CISA 003-2017 standard. Different specifications of G115 large-caliber thick-wall seamless steel pipes with the outer diameter of 325-1,200mm, the wall thickness of 20-180mm and the length of 12,500mm or below 12,500mm can be produced by adopting the method and can be applied to different fields of four major pipelines of an advanced ultra-supercritical boiler, a power station and the like. The steel ingots are adopted as the raw material, so that the production cost can be greatly reduced.

Description

technical field [0001] The invention relates to a method for manufacturing a seamless steel pipe, in particular to a method for manufacturing a G115 large-diameter thick-wall seamless steel pipe for a 630°C ultra-supercritical unit. Background technique [0002] As mankind enters the 21st century, energy saving and environmental protection have become the two major themes of modern industrial development. Under the guidance of the call for building a beautiful China, my country has taken the lead in the world in improving the thermal efficiency of thermal power units by improving steam parameters. The main "bottleneck" problem that restricts the development of thermal power units to high parameters is heat-resistant materials, while large-diameter boiler tubes and headers are "bottlenecks of bottlenecks." Under the guidance of the theory of "multi-element composite strengthening", combined with the research basis of MARBN steel, the General Institute of Iron and Steel Resea...

Claims

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Application Information

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IPC IPC(8): C21D8/10C21D9/08C21D1/18B21C37/06
CPCC21D1/18C21D8/105C21D9/08B21C37/06C21D9/085C21D1/26C21D1/28C21D2211/008Y02P20/54
Inventor 雷丙旺胡永平杜红强李永清黄艳丽刘科虹杨秀清姚建清赵先锋李宇光
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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