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A kind of 610mpa high-strength steel plate for oil reserve tank with low yield ratio and its manufacturing method

A high-strength steel plate, 610mpa technology, applied in the field of low-alloy steel production technology, to achieve the effect of short production cycle, saving quenching + tempering process, and improving production efficiency

Inactive Publication Date: 2016-05-11
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the 610Mpa high-strength steel plates for domestic oil storage tanks are mainly produced by offline quenching and tempering, and the production plants equipped with online quenching equipment also use the process of "on-line quenching + offline tempering" to produce 610Mpa high-strength steel plates for oil storage tanks. The yield ratio of the 30mm and above steel plate produced by the process is above 0.90, and the yield ratio of the thin steel plate is above 0.92, or even higher, which is difficult to meet the user's requirements for low yield ratio of oil storage tank steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The main components required for the production of steel plates are: C: 0.08%, Si: 0.25%, Mn: 1.54%, P: 0.010%, S: 0.005%, Nb: 0.017%, V: 0.037%, Ti: 0.012% ,: Ni: 0.17%, Mo: 0.10%, and the rest are Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter, and continuously cast into 250mmх2200mmх3060mm continuous casting slabs, which are heated to 1200°C; three-stage rolling of forming, widening, and extending is adopted, and the roughing mill is rolled for 8 passes. It is 1148°C, forming, widening and first-stage elongation rolling are completed; the intermediate billet is 60mm, the starting rolling temperature of the finishing mill is 960°C, 6 passes of rolling are adopted, and the final rolling temperature of 20mmх25530mmх29600mm steel plate is 870°C after final rolling. After the steel plate is rolled, there are three stages of cooling. In the first stage, the speed of the roller table of the finishing mill is set t...

Embodiment 2

[0039] The main components required for the production of steel plates are: C: 0.08%, Si: 0.25%, Mn: 1.53%, P: 0.010%, S: 0.003%, Nb: 0.021%, V: 0.042%, Ti: 0.012% ,: Ni: 0.19%, Mo: 0.11%, and the rest are Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter, and continuously cast into 250mmх1820mmх2970mm continuous casting slabs, which are heated to 1200°C; three-stage rolling of forming, widening, and extending is adopted, and the roughing mill is rolled for 8 passes. It is 1157°C, forming, widening and first-stage elongation rolling are completed; the intermediate billet is 95mm, the starting rolling temperature of the finishing mill is 950°C, 6 passes of rolling are adopted, and the final rolling temperature of 33mmх2830mmх12900mm steel plate is 867°C after final rolling. After the steel plate is rolled, there are three stages of cooling. In the first stage, the roller table speed of the finishing mill is set to 3.5m / ...

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Abstract

The invention belongs to the field of low alloy steel production processes, and specifically relates to a 610Mpa high-strength steel plate for a low-yield-ratio petroleum reserve tank and a manufacturing method thereof. The 610Mpa high-strength steel plate for the low-yield-ratio petroleum reserve tank comprises the following components in percentage by mass: 0.07-0.13% of C, 0.15-0.35% of Si, 1.45-1.60% of Mn, less than 0.015% of P, less than 0.005% of S, less than 0.030% of Nb, 0.03-0.05% of V, 0.010-0.020% of Ti, 0.08-0.18% of Mo, 0.15-0.35% of Ni, less than 0.008% of N and the balance of Fe and inevitable impurities. The method is capable of overcoming the limitation that the yield ratio is difficult to reduce in the traditional production and manufacturing method, simplifying the production process, shortening the production flow and reducing energy consumption, suitable for industrial batch production, and capable of ensuring a low yield ratio while meeting the requirements of strength, toughness and welding performance indexes.

Description

technical field [0001] The invention belongs to the field of low-alloy steel production technology, and in particular relates to a 610Mpa high-strength steel plate for oil storage tanks with a low yield ratio and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's petroleum and chemical industries, the demand for oil storage tanks is increasing. The manufacture of oil storage tanks is developing in the direction of high strength and large size. The volume of oil tanks continues to increase. The use of steel plates is safe. Higher requirements are put forward, requiring steel not only to have high strength, good toughness and weldability, but also to meet the requirements of low yield ratio. At present, steel plates with low yield ratio are mostly used in high-rise building steel, high-grade pipeline steel, etc., and the production of low yield ratio oil tank steel is gradually getting attention. At present, the 610Mpa high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 杜平刁承民宋国栋薛艳龙谢晖王振华孔雅
Owner SHANDONG IRON & STEEL CO LTD
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