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Large-thickness rack steel plate and production method thereof

A production method and large-thickness technology, applied in the field of metallurgy, can solve the problems of high welding crack sensitivity coefficient, high tempering temperature, welding difficulties, etc., and achieve the effect of improving the original structure, reducing internal stress, and avoiding bursting.

Active Publication Date: 2019-06-14
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of alloying elements such as carbon, it has a high welding crack sensitivity coefficient, which brings great difficulties to welding
In addition, the higher carbon content and carbon equivalent, in order to meet a certain strength and toughness matching, requires a high tempering temperature and a long time of heat preservation. The tempering temperature is generally higher than 650 ℃, and the heat preservation time is not less than 4.5min / mm. So that the matrix is ​​fully softened, so a lot of heat treatment fuel energy is wasted

Method used

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  • Large-thickness rack steel plate and production method thereof

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Effect test

Embodiment 1

[0018] The thick rack steel plate ZH70Q of this embodiment has a thickness of 180 mm, and its chemical composition and mass percentage are shown in Table 1.

[0019] The production method of the large-thickness rack steel plate ZH70Q in this embodiment includes smelting, heating, rolling, complete annealing, cutting riser and sampling, and heat treatment processes. The specific process steps are as follows:

[0020] (1) Smelting process: LF furnace refining white slag retention time 32min, total refining time 65min, good argon blowing throughout the whole process; before VD vacuum refining, feed Ca-Si wire, control calcium content at 0.0032%, refining vacuum degree 62Pa, vacuum maintenance The time is 25 minutes to ensure that the argon blowing is good throughout the whole process, and the soft blowing state is maintained for the last 5 minutes of VD vacuum refining, and the soft blowing is 10 minutes after the vacuum is broken;

[0021] (2) Heating process: After the steel in...

Embodiment 2

[0028] The thick rack steel plate ZH70Q of this embodiment has a thickness of 170 mm, and its chemical composition and mass percentage are shown in Table 1.

[0029] The production method of the large-thickness rack steel plate ZH70Q in this embodiment includes smelting, heating, rolling, complete annealing, cutting riser and sampling, and heat treatment processes. The specific process steps are as follows:

[0030] (1) Smelting process: LF furnace refining white slag retention time is 35min, total refining time is 68min, argon blowing is good throughout the whole process; Ca-Si line is fed before VD vacuum refining, calcium content is controlled at 0.0037%, refining vacuum is 64Pa, vacuum is maintained The time is 28 minutes, to ensure that the argon blowing is good throughout the whole process, the VD vacuum refining is kept in the soft blowing state for the last 6 minutes, and the soft blowing is 12 minutes after the vacuum is broken;

[0031] (2) Heating process: After the...

Embodiment 3

[0038] The thick rack steel plate ZH70Q of this embodiment has a thickness of 150mm, and its chemical composition and mass percentage are shown in Table 1.

[0039] The production method of the large-thickness rack steel plate ZH70Q in this embodiment includes smelting, heating, rolling, complete annealing, cutting riser and sampling, and heat treatment processes. The specific process steps are as follows:

[0040] (1) Smelting process: LF furnace refining white slag retention time is 33min, total refining time is 62min, argon blowing is good throughout the whole process; Ca-Si line is fed before VD vacuum refining, calcium content is controlled at 0.0034%, refining vacuum is 60Pa, vacuum is maintained The time is 23 minutes, to ensure that the argon blowing is good throughout the whole process, the VD vacuum refining is kept in the soft blowing state for the last 7 minutes, and the soft blowing is 9 minutes after the vacuum is broken;

[0041] (2) Heating process: After the s...

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Abstract

The invention discloses a large-thickness rack steel plate and a production method thereof. The steel plate is prepared from the chemical components in percentage by mass: 0.30% to 0.33% of C, 0.20% to 0.40% of Si, 0.55% to 0.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.85% to 0.95% of Cr, 0.50% to 0.60% of Mo, 0.60% to 0.70% of Ni, 0.020% to 0.040% of Al, andthe balance of Fe and inevitable impurities; and the production method includes the procedures of smelting, heating, rolling, complete annealing, dead head cutting, sampling, and heat treatment. According to the large-thickness rack steel plate and the production method thereof, alloy component designing is reasonable, annealing before heat treatment and the heat treatment technology of quenching+ tempering are combined, toughness has the high surplus amount while high hardness of the steel plate is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-thickness rack steel plate and a production method thereof. Background technique [0002] With the continuous development of my country's ocean development, the exploitation of offshore oil has gradually developed into the deep sea area, especially in the context of the national development of ocean strategy, the construction of offshore platforms has ushered in a new period of rapid development. High-strength steel plates for offshore platforms are widely used in the manufacture of structures such as drill floors, spud shoes, cantilever beams, and support rails. They are characterized by high strength, high toughness, large thickness, good weldability, high technical content, and difficult production. [0003] The traditional high-strength tempered steel plate for marine engineering adopts a chemical composition design with a relatively high carbon content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C21D1/18C21D1/26C21D8/02
Inventor 李峥李劲峰瞿征乔蕾
Owner WUYANG IRON & STEEL
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