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Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel

A technology of extra-thick slabs and pressure vessels, which is applied in the field of continuous casting production technology of extra-thick slabs for pressure vessels of hydropower stations, can solve problems such as surface transverse cracks, center segregation, and surface depressions, and achieve smooth production process easy-to-achieve effects

Active Publication Date: 2014-03-05
SHOUGANG CORPORATION
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to provide a continuous casting production process for extra-thick slabs used in hydropower station pressure vessel steels, which can solve the surface problems caused by using extra-thick slabs to produce steels with carbon content within the peritectic range and simultaneously containing niobium and boron elements. Defects such as depressions, surface transverse cracks and central segregation

Method used

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  • Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel
  • Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel
  • Continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel

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Embodiment Construction

[0028] When a steel plant casts 400mm×2000mm hydropower station pressure steel pipe continuous casting slabs on a continuous casting machine, the mold slag composition is full carbon-9.45%, CaO-40.12%, SiO 2 -29.87%, Fe 2 o 3 -0.65%, MgO-1.55%, Al 2 o 3 -3.17%, K 2 O-0.22%, Na 2 O-4.47%, MnO 2 -0.25%, F-6.27%, volatile matter -3.98%, melting point 1220°C, viscosity 0.188PaS, density 0.82g / mL; casting speed 0.65m / min; taper coefficient set to 1.55%, compensation value to 1.62mm; The specific water volume of the secondary cooling is 0.24L / kg, the 3D nozzles at the side of the secondary cooling zone 8-9 have no water cooling, and the water volume of the central nozzle is 9L / min; the water volume of the central nozzle of the secondary cooling zone 10 is 5L / min, and the 3D nozzles at the side are without water Cooling; when fs=7% for light reduction scheme, the reduction is 0.3mm; when fs=45%, the reduction is 2.2mm; when fs=75%, the reduction is 5.6mm, fs=100% , the reducti...

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Abstract

The invention discloses a continuous casting manufacturing process of ultra-thick slabs for hydropower station pressure vessel steel, and belongs to the technical field of steelmaking-continuous casting. The process includes the steps that casting powder special for peritectic steel of which the carbon content ranges from 0.08% to 0.14% is designed according to continuous casting characteristics of the peritectic steel; taper values of hydropower station steel penstock casting blanks with different thicknesses are set according to steel type conditions. The defects of surface transverse cracks of the casting blanks and corner transverse cracks of the casting blanks are overcome by setting an ultra-thick slab continuous casting secondary cooling mode. Different pulling rates are set according to the thickness and the width of the slabs, and the problem of center segregation of the ultra-thick slabs is solved through low-pulling-rate casting. The process has the advantages that the process is simple and high in generalization performance, the applicable thickness specification range of the continuous casting slabs is from 400mm to 600mm, and the width specification range is from 1600mm to 3000mm. By utilizing the ultra-thick slabs to manufacture hydropower station steel penstocks through the process, surface indentations, surface transverse cracks and the center segregation level of the casting blanks all can be well controlled.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular provides a continuous casting production process of extra-thick slabs for pressure vessels of hydropower stations. The applicable continuous casting slab thickness specification range is 400-600mm, and the width specification range is 1600-3000mm. Background technique [0002] The penstock of a hydropower station is an important part of the water delivery system of a hydropower station. Strength (yield strength and tensile strength), plasticity, toughness and weldability are its four important quality parameters. Therefore, its composition is designed as shown in the table below. [0003] C Si mn P≤ S≤ Alt 0.080-0.110 0.15-0.40 1.20-1.35 0.015 0.003 0.020-0.050 Nb V Ti Ni Cr Cu≤ 0.015-0.035 0.020-0.040 0.012-0.025 0.25-0.4 0.4-0.5 0.5 Mo ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D11/18B22D11/22
Inventor 赵新宇刘洋关春阳甄新刚邹扬赵楠秦丽晔樊艳秋朱志远姜中行马长文隋鹤龙张虎成赵海清
Owner SHOUGANG CORPORATION
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