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Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio

A technology of compression ratio and continuous casting slab, which is applied in the direction of workpiece surface treatment equipment, metal rolling, manufacturing tools, etc., can solve the problems of increasing smelting costs and does not involve extra-thick and wide X65 pipeline steel plates, etc., to reduce smelting costs, The effect of large width-to-span ratio and increased pass reduction rate

Active Publication Date: 2014-03-19
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the extremely low content of phosphorus and sulfur, the cost of smelting is increased
[0004] Judging from the existing thick specification pipeline steel patents and other literature reports, there is no related technology related to the production of extra-thick and wide X65 pipeline steel plates with a thickness of 300mm x width of 1800-2000mm continuous casting slabs of thickness 40-50mm x width of 3200-4000mm

Method used

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  • Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio
  • Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio
  • Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio

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Embodiment 1

[0033]The chemical composition is (calculated by wt%): C: 0.09%, Si: 0.25%, Mn: 1.5%, S: 0.002%, P: 0.012%, Nb: 0.05%, V: 0.04%, Ti: 0.02% , the rest is Fe and unavoidable impurities, and the continuous casting slab with a cross-sectional size of 300mm in thickness and 2000mm in width is sent into a walking heating furnace to be heated to 1215°C and kept for 500 minutes. The heated continuous casting slab is rolled in the austenite recrystallization zone and austenite non-recrystallization zone rolling. In the rolling of the austenite recrystallization zone, the starting rolling temperature is 1190 ° C, and the finishing rolling temperature is 1140 ° C. ℃, in the rolling in the austenite recrystallization zone, the width of the continuous casting slab is first rolled continuously from 2000mm to 3600mm, and the thickness is 175mm so that the longitudinal cumulative compression ratio is 3.5 (175mm / 50mm). Continuous longitudinal rolling of the continuous casting slab until the th...

Embodiment 2

[0035] The chemical composition is (calculated by wt%): C: 0.09%, Si: 0.25%, Mn: 1.5%, S: 0.002%, P: 0.012%, Nb: 0.05%, V: 0.04%, Ti: 0.02% , the rest is Fe and unavoidable impurities, and the continuous casting slab with a cross-sectional size of 300mm in thickness and 2000mm in width is sent into a walking heating furnace and heated to 1215°C and kept for 500 minutes. The heated continuous casting slab is rolled in the austenite recrystallization zone and austenite non-recrystallization zone rolling. In the rolling of the austenite recrystallization zone, the starting rolling temperature is 1190 ° C, and the finishing rolling temperature is 1140 ° C. ℃, in the rolling in the austenite recrystallization zone, the width of the continuous cast slab is first continuously extended and rolled from 2000mm to 3700mm, and the thickness is 144mm so that the longitudinal cumulative compression ratio is 3.6 (144mm / 40mm). Continuous longitudinal rolling of the continuous casting slab unt...

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Abstract

The invention provides a method for producing a pipeline steel plate by a continuous casting billet under the condition of a small reduction ratio. The method includes the steps: heating the continuous casting billet with 300mm thickness and 1800-2000mm width to reach the temperature of 1150-1250 DEG C and keeping the temperature for more than 400 minutes; rolling an austenite recrystallization zone and an austenite non-recrystallization zone for the heated continuous casting billet; cooling the rolled steel plate at the speed of 5-20 DEG C / s to obtain the pipeline steel plate with 40-50mm thickness and 3200-4000mm width. In rolling of the austenite recrystallization zone, the start rolling temperature is 1150-1200 DEG C, the width expansion ratio is at least 1.6, and the holding thickness is 2-4 times of the thickness of a finished product. In rolling of the austenite non-recrystallization zone, the start rolling temperature is 830-900 DEG C. The start cooling temperature is 700-800 DEG C, and the final cooling temperature is 550-600 DEG C. P and S contents do not need to be controlled and are quite low, and smelting cost is reduced.

Description

technical field [0001] The invention relates to a method for producing extra-thick and wide pipeline steel plates by using continuous casting slabs, in particular to a method for producing extra-thick and wide X65 pipeline steel plates by using continuous casting slabs under the condition of small compression ratio. Background technique [0002] As energy demand continues to increase, pipeline construction is gradually extending to harsh areas such as oceans, seismic zones, and polar frozen land. In order to improve pipeline transportation efficiency, reduce energy consumption, reduce investment and operating costs, and ensure the safety of pipeline use, steel for oil and gas transmission pipelines is developing in the direction of high-strength grades and large wall thicknesses. The demand is gradually increasing. Up to now, the thickness specification of pipeline steel has reached 40mm. The maximum wall thickness of X70 pipeline steel used in my country's West-East Gas P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21B45/02C22C38/12C22C38/14C22C38/04
Inventor 霍孝新周平黄少文汤化胜吴会亮吴德发
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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