Q345-serie super-thick steel plate having low cost and guaranteeing performances and flaw detection, and production technology thereof

A technology of extra-thick steel plate and production process, which is applied in the field of steel, can solve the problems of not meeting market demand, high energy consumption, and poor quality of flaw detection

Inactive Publication Date: 2013-04-24
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the large-scale equipment, the demand for extra-thick plates has increased, but the traditional 100-200mm extra-thick plates are produced by die-casting technology, which has high production costs, low yield, poor flaw detection quality, and high energy consumption. Can not meet market demand

Method used

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Embodiment Construction

[0011] The invention adopts the method of KR molten iron pretreatment, converter smelting, LF+VD, continuous casting, and 3800m wide and thick plate rolling mill to produce Q345 series extra-thick steel plates. Its technological process is: KR molten iron pretreatment, converter smelting, LF refining, vacuum refining (optional), continuous casting, slab heating, rolling, ACC laminar cooling, 11-roll hot straightening machine, slow cooling, heat treatment ( Optional), finishing, external inspection, flaw detection, storage.

[0012] The implementation is as follows:

[0013] Composition Design:

[0014] In the technical proposal, the P460NL1 (L2) extra-thick steel plate for pressure vessels with a thickness of 250 mm and guaranteed performance and flaw detection contains the following chemical composition in mass percentage (unit, wt%):

[0015] element C Si mn P S als Ti Cr Nb Novel ingredients 0.08～0.17 0.15～0.40 1.00～1.30 ≤0.020 ≤0.020 0.0...

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PUM

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Abstract

The invention discloses a Q345-serie super-thick steel plate having a low cost and guaranteeing performances and flaw detection, and a production technology thereof. The Q345-serie super-thick steel plate has the thickness of 100 to 200mm. The Q345-serie super-thick steel plate comprises 0.08 to 0.17wt% of C, 0.15 to 0.40wt% of Si, 1.00 to 1.30wt% of Mn, less than or equal to 0.020wt% of P, less than or equal to 0.020wt% of S, less than or equal to 2.0wt% of microalloying elements comprising V, Nb, Ti, Cr and Ni, 0.020 to 0.050wt% of Als and the balance Fe and residual elements. The production technology comprises the following steps of KR molten iron pretreatment, converter smelting, LF refining, vacuum refining, continuous casting, casting blank heating, rolling, slow cooling and heat treatment. Through a reasonable chemical composition design and the LF and VD refining processes, steel cleanliness is guaranteed. Through superheating, rolling and normalizing treatment, the Q345-serie super-thick steel plate having the thickness of 100 to 200mm and guaranteeing performances and flaw detection is prepared by the continuous casting technology. The Q345-serie super-thick steel plate has yield strength of 310 to 400MPa, tensile strength of 490 to 580MPa, percentage elongation of 22 to 27% and V-notch impact energy of 80 to 200J.

Description

technical field [0001] The invention relates to steel products, in particular to a low-cost Q345 series extra-thick steel plate with guaranteed performance and flaw detection and a production process. Background technique [0002] Q345 series low-alloy steel plate is low-alloy steel, which is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q stands for the yield of this material, and the following 345 refers to the yield value of this material, which is around 345. [0003] In view of the large-scale equipment, the demand for extra-thick plates has increased, but the traditional 100-200mm extra-thick plates are all produced by die-casting technology, which has high production costs, low yield, poor flaw detection quality, and high energy consumption. Can not meet market demand. Contents of the invention [0004] In view of the above problems, the present inventor obtained a production process for improving the flaw detection quality of low-allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/50C22C38/48C22C38/46C22C38/40C22C38/28C22C38/26C22C38/24C22C38/18C22C38/14C22C38/12C22C38/08C21C7/10C21C7/076C21D8/02C21D1/28B22D11/18B22D11/22
CPCY02P10/242Y02P10/20
Inventor 朱书成许少普刘庆波袁少威郭艳芳康文举雷文慧陈景雪庞百鸣
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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