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Large-thickness rack steel plate directly produced by continuous casting billet and manufacturing method of large-thickness rack steel plate

A technology of continuous casting slab and large thickness, which is applied to the production of large thickness rack steel plate and its manufacturing field directly from continuous casting slab, can solve the problem that the performance of the core part of the large thickness rack steel plate is difficult to be guaranteed, the quality of the core part is segregated and the looseness is poor. , increase in manufacturing costs and other issues, to achieve the effect of eliminating the slab composite processing process, simplifying the production process and reducing the manufacturing cost

Active Publication Date: 2013-12-25
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, the invention uses traditional die-casting steel ingots as blanks to manufacture, not only the production process is complex but also the yield is low, which significantly increases the manufacturing cost
At the same time, because of the poor core quality (such as segregation and porosity) of die-cast steel ingots, it is difficult to guarantee the core performance of large-thickness rack steel plates produced from steel ingots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The thickness of the rack steel plate involved in this example is 152.4mm, and the components and their mass percentages are: C: 0.13%, Si: 0.23%, Mn: 1.02%, P: 0.005%, S: 0.001%, Cr + Mo + Ni + Cu = 2.63%, Al + V = 0.10%, N: 0.003%, B: 0.0016%, and the balance is iron and unavoidable impurity elements.

[0022] The production process of the large thickness rack steel plate is as follows:

[0023] The smelting raw materials are configured according to the chemical composition of the rack steel plate above, followed by KR molten iron pretreatment - converter smelting - LF refining - RH refining - continuous casting (thickness of continuous casting slab: 370mm) - slow cooling of continuous casting slab with cover - continuous casting slab cleaning – Heating (heat preservation treatment) – High pressure water descaling – Controlled rolling – Straightening – Stack slow cooling – Quenching and tempering.

[0024] Further speaking, the specific process of the above-mentioned...

Embodiment 2

[0028] The thickness of the rack steel plate involved in this example is 152.4mm, and the components and their mass percentages are: C: 0.14%, Si: 0.25%, Mn: 1.05%, P: 0.007%, S: 0.001%, Cr + Mo + Ni + Cu = 2.65%, Al + V = 0.11%, N: 0.004%, B: 0.0014%, and the balance is iron and unavoidable impurity elements.

[0029]The central segregation of the continuous casting slab used in this embodiment is Class C 0.5 grade, and the central porosity is 0.5 grade. The manufacturing process of the steel plate is basically the same as in Example 1, but there are differences in its quenching and tempering process, as follows:

[0030] The rolled steel plate enters the continuous furnace for quenching and heating, the heating temperature is 900°C, the time in the furnace is 1.8min / mm, and the quenching machine is used for water quenching. The quenched steel plate is tempered using a continuous furnace. Tempering temperature: 615°C, time in the furnace: 3.5min / mm, air cooling after being ...

Embodiment 3

[0033] The thickness of the rack steel plate involved in this example is 152.4 mm, and the components and their mass percentages are: C: 0.14%, Si: 0.27%, Mn: 1.04%, P: 0.007%, S: 0.001%, Cr + Mo + Ni + Cu = 2.70%, Al + V = 0.10%, N: 0.0023%, B: 0.0018%, and the balance is iron and unavoidable impurity elements.

[0034] The central segregation of the continuous casting slab used in this embodiment is Class C 0.5 grade, and the central porosity is 0.5 grade. The manufacturing process of the steel plate is basically the same as that of Example 1, but there are differences in the heating before rolling, the slow cooling after rolling and the subsequent quenching and tempering process, as follows:

[0035] The continuous casting slab is heated to 1200°C for 3 hours, and after being released from the furnace, it is descaled by high-pressure water, and then rolled in two stages. The first stage rolling (i.e. rough rolling) start rolling temperature is 1060°C, the intermediate bill...

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Abstract

The invention relates to a large-thickness rack steel plate directly produced by a continuous casting billet. The steel plate takes Fe as a base component and further comprises the following chemical components by mass percent: 0.10% to 0.16% of C, 0.15% to 0.35% of Si, 0.95% to 1.25% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, greater than or equal to 2.4% and less than or equal to 3.0% of Cr+Mo+Ni+Cu, greater than or equal to 0.08% and less than or equal to 0.13% of Al+V, less than or equal to 0.007% of N and 0.001% to 0.002% of B. A manufacturing method of the large-thickness rack steel plate comprises the following steps of KR molten iron pretreatment, converter smelting, LF (ladle furnace) refining, RH refining, continuous casting, casting billet covering for slow cooling, casting billet clearing, heating, high-pressure water descaling, rolling control, straightening, accumulation slow-cooling or slow cooling under a control condition and tempering. The steel plate is high in strength, good in plasticity, high in Z-direction performance and high in low-temperature toughness. In addition, the steel plate is simple and convenient in production process and low in cost.

Description

technical field [0001] The invention relates to a method for directly producing large-thickness rack steel plates by continuous casting slabs. Background technique [0002] With the development of offshore oil and gas exploration and exploitation in deep waters, jack-up offshore platforms have put forward higher and higher requirements for the strength, plasticity, toughness and thickness of steel plates used for racks. For example, a 350-foot jack-up offshore platform usually requires a rack steel plate with a thickness of 152.4mm, a yield strength of 3690MPa, a tensile strength in the range of 790-930MPa, and an elongation of 314%. 4 The thickness is -40°C, and the Charpy impact energy is 369J at the center of the steel plate, that is, -27°C at the 1 / 2 thickness. For this reason, the industry has been committed to the development of large-thickness rack steel plates that meet these requirements. For example, the invention patent with the patent publication number CN10234...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02C21C7/10B22D11/00
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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