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A process for improving the performance of large-diameter carbon steel cast-rolled flanges

A process method and large-diameter technology, applied in the direction of metal rolling, can solve the problems of coarse grains, the mechanical properties of flanges are difficult to meet the requirements of industrial use, etc., and achieve the effect of strong competitiveness.

Inactive Publication Date: 2017-02-15
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The forged ring billet has undergone blank opening, upsetting and punching processes, the segregation, porosity and plasticity of the material have been greatly improved, and the formed flange has a good microstructure, while the cast ring billet has coarse grains and the material There is structure segregation and porosity, and the mechanical properties of the flange formed by conventional rolling and expanding technology are difficult to meet the requirements of industrial use

Method used

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  • A process for improving the performance of large-diameter carbon steel cast-rolled flanges
  • A process for improving the performance of large-diameter carbon steel cast-rolled flanges

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Embodiment Construction

[0022] Such as figure 1 The cast ring of material Q345B shown has an outer diameter of 740mm, an inner diameter of 380mm, and a height of 185mm. It is formed by controlled rolling and controlled cold rolling through a ring diameter-axial rolling machine to reach an outer diameter of 1550mm, an inner diameter of 1306mm, and a height of 105mm. Its process steps are:

[0023] ①Heating the casting ring in the ring heating furnace: the temperature in the preheating section is 900°C, and the heating time is 90 minutes; → the temperature in the heating section is 1250°C, and the heating time is 120 minutes;

[0024] ②Remove phosphorus by spraying high-pressure water to the entire ring billet: water temperature 20°C, water pressure 15MPa, flow rate 50m 3 / h, spray distance 150mm, spray angle 20°, ring billet temperature after high pressure water descaling is 1050°C;

[0025] ③Put the dephosphorized ring blank into the CNC ring rolling machine for hole reaming, the core roller 4 rota...

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Abstract

The invention discloses a technological method for improving the performance of a large-diameter carbon steel cast and rolled flange part and belongs to the technical field of flange part production. The technological method is characterized by comprising the first step of carrying out cast ring blank homogenization, the second step of carrying out high-pressure water descaling, the third step of carrying out chambering on a ring rolling machine and the fourth step of carrying out rolling control after rolling, wherein the second step specifically refers to that a cast ring blank is heated in a preheating stage, a heating stage and a soaking stage in a heating furnace, and the third step refers to radial accelerated ring rolling, axial accelerated ring rolling, stable ring rolling and speed reducing and finishing ring rolling. The technological method has the advantages that microstructure transformation of materials is achieved through control over the deformation amount and temperature, and then the performance of the large-diameter carbon steel flange molded through cast ring blank ring rolling is effectively improved; meanwhile, the technological method has the advantages of being low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of flange parts production, and in particular relates to a process method for improving the performance of large-diameter carbon steel cast-rolled flange parts. Background technique [0002] Flange ring parts are basic industrial parts and are widely used in wind power, nuclear power, petroleum, chemical, aerospace, natural gas and other industries. In recent years, with the rapid development of pipeline engineering, wind power technology and petrochemical industry, the demand for flange parts has increased sharply, and the size has gradually become giant. At present, the main process method for producing large-diameter flange parts is hot rolling, that is, the heated ring billet will produce a continuous process of radial wall thickness reduction, internal and external diameter expansion, and axial height reduction under the action of the forming roller of the rolling machine. Local plastic deformation (se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C21D8/00
CPCB21H1/06C21D8/00
Inventor 巨丽李永堂曹建新付建华雷步芳武永红
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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