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High strength and high toughness ship plate steel with thick specification and production method thereof

A high-strength, high-toughness, production method technology, applied in the direction of temperature control, etc., can solve the problems of uneven performance along the thickness direction, harsh requirements for rolling mill equipment, uneven structure, etc., and achieve good structure uniformity, optimized speed range, and homogenization organization effect

Inactive Publication Date: 2011-07-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems: the high price of Cu, Nb and other alloy elements greatly increases the production cost; the large thickness of the slab brings difficulties to the uniformity of continuous casting; In the process, the temperature gradient causes uneven structure, different properties along the thickness direction, insufficient low-temperature impact toughness in the core; plate size control, etc.

Method used

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  • High strength and high toughness ship plate steel with thick specification and production method thereof
  • High strength and high toughness ship plate steel with thick specification and production method thereof
  • High strength and high toughness ship plate steel with thick specification and production method thereof

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Embodiment 1

[0024] This embodiment is a thick-gauge, high-strength, high-toughness ship plate steel and its production method. The components are calculated by weight percentage: C 0.1133%, Si 0.312%, Mn 1.4812%, Ni 0.228%, Cu 0.0337%, Mo 0.005%, Nb 0.028%, Ti 0.004%, P 0.0083%, S 0.0019%, Cr 0.0734%, V 0.0436%, the balance is Fe and unavoidable inclusions, and the billet with a thickness of 150mm is continuously cast.

[0025] The slabs are stacked and cooled for more than 72 hours, and the slabs are heated at 1200°C, the temperature uniformity is less than 20°C, the heating rate is 12-14min / cm, and after 30-50min of heat preservation, high-pressure water dephosphorization is carried out, and two-stage controlled rolling is carried out. The finish rolling temperature in the recrystallization zone is 1060°C, and the deformation rate is 3s -1 , The amount of deformation in 4 passes is 60%, and the thickness of the intermediate billet is controlled at 90mm. The rolling start temperature in...

Embodiment 2

[0031] This embodiment is a kind of thick-gauge, high-strength and high-toughness ship plate steel and its production method. The components are calculated by weight percentage, C 0.1247%, Si 0.309%, Mn 1.49%, Ni 0.29%, Cu 0.0385%, Mo 0.0069%, Nb 0.0332%, Ti 0.008%, P 0.0084%, S 0.0011%, Cr 0.0619%, V 0.049%, the balance is Fe and unavoidable inclusions, and the billet with a thickness of 150mm is continuously cast.

[0032] The slabs are stacked and cooled for more than 72 hours, the temperature of the slab soaking section is 1257°C, the temperature uniformity is less than 20°C, the heating rate is 12-14min / cm, and after 30-50min of heat preservation, high-pressure water dephosphorization is carried out, and two-stage controlled rolling is carried out. The rolling start temperature in the recrystallization zone is 1075°C, and the deformation rate is 3s -1 , The amount of deformation in 5 passes is 65%, and the thickness of the intermediate billet is controlled at 90mm. The r...

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Abstract

The present invention relates to a ship plate steel and a production method thereof, in particular to a high strength and high toughness ship plate steel with thick specification and a production method thereof. The ship plate steel is designed by being added with a small amount of components of Mo, Cu, Ni and Cr and is rolled in a crystalline area; the deformation rate is more than 3s, and the deformation quantity is more than 60%; when the ship plate steel is not rolled at the crystalline area, the compression ratio is maintained to be about 1.5 times, and enough phase deformation epipoles can be obtained for making preparation for normalizing; cooling at the speed of 6-20 DEG C / s, and the final cold temperature is controlled within the range of 680-700 DEG C; after being cooled, rolled pieces are off-line and cooled in heap as soon as possible, and the temperature of cooling in heap is higher than or equal to 600 DEG C; normalizing treatment is carried out on the steel plate which is cooled to be the room temperature, the normalizing temperature is 910+ / -5 DEG C, the heat preservation time is 1.0-1.2H, and the air is cooled to be the room temperature; finally, fine even ferrite and pearlite structure can be obtained, and the toughness of the material can be synchronously improved; and the final product has the yield strength delta s of more than or equal to 355MPa, the tensile strength delta b of more than or equal to 490MPa, the elongation psi of more than or equal to 26%, and the (-60 DEG C) Charpy impact power of more than or equal to 100J.

Description

technical field [0001] The invention relates to a ship plate steel and a production method thereof, in particular to a thick gauge high strength and high toughness ship plate steel and a production method thereof. Background technique [0002] At present, with the development of the economy, the demand for energy and raw materials is increasing, the international economic exchanges are more frequent, and the marine transportation has brought about the vigorous development of the shipbuilding industry. Shipbuilding steel plates account for a considerable proportion of shipbuilding raw materials. In order to reduce costs, increase transportation volume, and expand the scope of activities, large-scale, lightweight, excellent weldability and high low-temperature impact toughness are the development trends of shipbuilding steel plates. Considering factors such as strength, toughness and manufacturing cost, there is still a large demand for 350-400Mpa wide and thick ship plates. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C21D1/28C21D8/02B21B37/74
Inventor 尹雨群朱爱玲武会宾徐耀文
Owner NANJING IRON & STEEL CO LTD
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