610Mpa high-strength steel plate for low-yield-ratio petroleum reserve tank and manufacturing method thereof

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 energy saving

Inactive Publication Date: 2015-03-25
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-strengt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] The main components required for steel plate production are as follows: 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%, the rest is Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter and continuously cast into a continuous casting slab of 250 mm х 2200 mm х 3060 mm. The continuous casting slab is heated to 1200 ℃; three-stage rolling is adopted for forming, widening, and elongation. The roughing mill is rolled for 8 passes, and the rolling The temperature is 1148℃, and the forming, broadening and first-stage extension rolling are completed; the intermediate billet is 60mm, and the finishing rolling temperature of the finishing mill is 960℃. It is rolled in 6 passes, and the final rolling temperature is 870 for 20mmх25530mm х29600mm steel plate. ℃. After the steel plate is cooled in three stages, the first stage is set to 4m / s for t...

Example Embodiment

[0038] Example 2

[0039] The main components required to produce steel plates are as follows: 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%, the rest is Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter and continuously cast into a continuous casting slab of 250 mm х 1820 mm х 2970 mm. The continuous casting slab is heated to 1200 ℃; it adopts three-stage rolling of forming, widening, and elongation. The rough rolling mill is rolled 8 passes, and the rolling The temperature is 1157℃, and the forming, broadening and first-stage extension rolling are completed; the intermediate billet is 95mm, and the finishing rolling temperature of the finishing mill is 950℃. It is rolled in 6 passes, and the final rolling is 33mmх2830mm х12900mm steel plate. The final rolling temperature is 867 ℃. After the steel plate is cooled in three stages, the first stage sets the...

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PUM

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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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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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