High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate

A high-toughness, steel plate technology, applied in the field of high-toughness F-grade extra-thick rack steel plate and its manufacturing field, can solve the problem of inability to manufacture extra-thick rack steel plate for offshore platforms, and achieve high Z-direction performance and excellent tensile properties. Effect

Active Publication Date: 2014-04-16
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology can only manufacture steel plates with a maximum thickness of 120 mm, and cannot manufacture rack steel plates for extra-thick offshore platforms that are in high demand with a thickness of 127 mm to 180 mm

Method used

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  • High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate
  • High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The thickness of the rack steel plate involved in this example is 180 mm, and the components and their mass percentages are: C: 0.12%, Si: 0.23%, Mn: 1.08%, P: 0.003%, S: 0.001%, Cr: 0.70 %, Mo: 0.50%, Ni: 2.51%, Cu: 0.24%, Alt: 0.077%, V: 0.040%, Nb: 0.022%, N: 0.0032%, B: 0.0018%, the balance is iron and unavoidable Impurity elements, carbon equivalent CEV ( = C + Mn / 6 + (Cr + Mo + V) / 5 + (Cu + Ni) / 15)) = 0.73.

[0038] The production process of the rack steel plate is as follows:

[0039] Allocation of smelting raw materials according to the above chemical composition of the rack steel plate followed by electric furnace smelting – LF refining – VD refining – die casting – slow cooling pit slow cooling – ingot heating – billet rolling – slow cooling under controlled conditions – billet heating – high pressure Water descaling - controlled rolling - straightening - stack slow cooling - quenching and tempering.

[0040] Calcium treatment is carried out by feeding silic...

Embodiment 2

[0049] The thickness of the rack steel plate involved in this example is 127 mm, and the components and their mass percentages are: C: 0.14%, Si: 0.24%, Mn: 1.06%, P: 0.003%, S: 0.002%, Cr: 0.50 %, Mo: 0.49%, Ni: 1.40%, Cu: 0.25%, Alt: 0.07%, V: 0.039%, N: 0.0046%, B: 0.0015%, the balance is iron and unavoidable impurity elements, carbon equivalent CEV = 0.63.

[0050] The smelting and die-casting manufacturing process of this embodiment is basically the same as that of Embodiment 1, the main difference lies in the billet rolling, the controlled rolling of the billet and the subsequent quenching and tempering heat treatment, as follows:

[0051] The cleaned steel ingots are heated in a soaking furnace to 1260-1280°C for 16 hours, and then released from the furnace. After descaling by high-pressure water, the billets are rolled to form billets with a thickness of 380mm. After the steel billet is slowly cooled under controlled conditions (heated to 650 ° C for 24 hours and then...

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Abstract

The invention relates to a high-ductility Class F extra thick rack steel plate used at a low temperature and a manufacturing method of the steel plate. The steel plate takes Fe as a basic element and comprises C, Si, Mn, P, S, Cr, Mo, Ni, Cu, Al, V, Nb, N, B and the balance of Fe and impurity elements, wherein the carbon equivalent CEV is 0.75 pounds. The manufacturing method sequentially comprises the procedures of electric furnace smelting, LF (Ladle Furnace) refining, VD (Vacuum Distillation) refining, die casting, ingot heating, cogging rolling, slow cooling control, billet heating, rolling, thermal refining and the like. The thickness of the rack steel plate can reach 180mm, the yield strength is above 690MPa, the tensile strength is between 790-930MPa, the elongation<3> is 20%, the Z-direction performance (percentage reduction of area)<3> of the steel plate is 35%, the Charp impact work below -60 DEG C is greater than 100J, and the comprehensive mechanical property is excellent.

Description

technical field [0001] The invention relates to a high-toughness F-class extra-thick rack steel plate used at low temperature and a manufacturing method thereof. Background technique [0002] When building a jack-up platform for oil and gas exploitation in cold sea areas, the key components in the platform are required? The rack not only has high strength and good plasticity, but also requires high strength at very low temperatures (-60°C). Impact toughness. Usually, the yield strength of rack steel is required to be 3690MPa, the tensile strength is in the range of 790~930MPa, the elongation is 314%, and the Charpy impact energy at -60°C at 1 / 4 and 1 / 2 thickness of the steel plate should be 3 69J. According to the different water depths in the working sea area of ​​the platform, the required rack steel plate is usually in the thickness range of 127mm to 180mm. At present, most of the platforms under construction are 400-foot platforms, which require the thickness of the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21D8/02C21D1/25
Inventor 苗丕峰李国忠吴小林李经涛刘观猷孙宪进赵孚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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