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Steel for controlled rolling and controlled cooling platform and production method thereof

An offshore platform, controlled rolling and controlled cooling technology, applied in the direction of temperature control, etc., can solve the problems of long production cycle, high production cost, complex process, etc., and achieve the effect of good cold bending performance, short delivery cycle and cost saving

Active Publication Date: 2011-07-13
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems in the steel used for offshore platforms and its production technology are: (1) The products delivered in the normalizing state have a long production cycle, complex process, and high production cost; (2) The alloy elements of the products delivered in the controlled rolling and controlled cooling state High content, the effect of controlled cooling after rolling is not fully exerted, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The design composition of controlled rolling and controlled cooling offshore platform steel is: C0.085%, Mn1.42%, Si0.36%, Nb0.034%, Ti0.012%, V0.066%, S0.003 %, Als0.030%, P0.010%, and the rest are Fe and unavoidable impurities.

[0021] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:

[0022] The molten steel designed and smelted according to the above chemical composition is cast into a 250mm thick slab; the slab is loaded into the slab heating furnace for heating at a heating temperature of 1200°C for 4 hours; then it is rolled out of the furnace. The starting temperature of rough rolling is controlled at 1060-1120°C; the thickness of the intermediate billet is 90mm; the starting temperature of finishing rolling is controlled at 850-870°C; the final rolling temperature is controlled at 780-815°C. The start cooling temperature is controlled at 770-800°C; the end cooling temperature is controlled at 580-600°C; the cooli...

Embodiment 2

[0025] The design composition of controlled rolling and controlled cooling offshore platform steel is: C0.065%, Mn1.31%, Si0.39%, Nb0.037%, Ti0.014%, V0.05%, S0.002 %, Als0.038%, P0.008%, and the rest are Fe and unavoidable impurities.

[0026] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:

[0027] The molten steel smelted according to the above chemical composition design is cast into a 250mm thick slab; the slab is put into the slab heating furnace for heating, the heating temperature is 1180°C, and the heating time is 4h; then it is rolled out of the furnace. The starting temperature of rough rolling is controlled at 1070-1120°C; the thickness of the intermediate billet to be warmed is 100mm; the starting temperature of finishing rolling is controlled at 845-860°C; the final rolling temperature is controlled at 780-805°C. The start cooling temperature is controlled at 770-795°C; the end cooling temperature is controlled at ...

Embodiment 3

[0030] The design composition of controlled rolling and controlled cooling offshore platform steel is: C0.071%, Mn1.35%, Si0.38%, Nb0.041%, Ti0.012%, V0.051%, S0.002 %, Als0.034%, P0.007%, and the rest are Fe and unavoidable impurities.

[0031] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:

[0032] The molten steel designed and smelted according to the above chemical composition is cast into a 250mm thick slab; the slab is loaded into the slab heating furnace for heating at a heating temperature of 1200°C for 4 hours; then it is rolled out of the furnace. The starting temperature of rough rolling is controlled at 1080-1120°C; the thickness of the intermediate billet is 150mm; the starting temperature of finishing rolling is controlled at 840-855°C; the final rolling temperature is controlled at 780-800°C. The start cooling temperature is controlled at 770-790°C; the end cooling temperature is controlled at 570-590°C; the cool...

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Abstract

The invention relates to steel used for controlled rolling and cooling offshore platform, and a production method thereof. The invention belongs to the technical field of low-alloy high-strength steel. The steel was produced through slab continuous casting and TMCP processes after steel making and refining. The components of the slab are as follows: 0.05 percent to 0.09 percent of C, 1.20 percentto 1.60 percent of Mn, 0.20 percent to 0.50 percent of Si, 0.03 percent to 0.05 percent of Nb, 0.010 percent to 0.020 percent of Ti, 0.03 percent to 0.06 percent of V, equal to or less than 0.005 percent of S, 0.020 percent to 0.040 percent of Als, equal to or less than 0.015 percent of P, and the rest are Fe and impurities. Molten steel which is smelt by the component is cast into the slab whichis 220mm to 250mm thick; the ingot is put into a slap heating furnace to be heated and rolled when being discharged. The initial billet temperature for rough rolling is 1060 DEG C to 1160 DEG C, the initial billet temperature for fine rolling is 840 DEG C to 940 DEG C, and the finishing temperature is 780 DEG C to 820 DEG C; the thickness of the rolled steel sheet is 10mm to 60mm. The starting cooling temperature is 760 DEG C to 810 DEG C; the finishing cooling temperature is 550 DEG C to 650 DEG C; the cooling speed is 10 DEG C / s to 17 DEG C / s. The production method has the advantages of simplified procedures and cost saving.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel, and in particular relates to a controlled rolling and controlled cooling offshore platform steel and a production method thereof, which is a 40kg, Z35 grade TMCP (process system of controlled rolling plus controlled cooling) used for offshore platforms steel. Background technique [0002] With the continuous rise of international oil prices, countries around the world have attached great importance to the exploitation of marine resources. For example, Japan has listed marine technology as one of the country's 12 high-tech key developments. In view of my country's current urgent need for energy strategic reserves, research and development of high-strength, high-toughness offshore platform thick steel plates with independent intellectual property rights will help improve my country's energy system, restrain neighboring countries from plundering my country's sea area resources,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/00B21B37/74
Inventor 江卫华沈一平刘振宇姜中行麻庆申刘学一吴斌李战军何元春狄国标杨春卫沈开照王国栋田鹏石树东
Owner SHOUGANG CORPORATION
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