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A kind of large-thickness rack steel plate and its production method

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

Active Publication Date: 2021-11-16
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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  • A kind of large-thickness rack steel plate and its production method

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Experimental program
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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 chemical composition and mass percentage of the steel plate are: C: 0.30-0.33%, Si: 0.20-0.40%, Mn: 0.55-0.65% , P≤0.010%, S≤0.005%, Cr: 0.85~0.95%, Mo: 0.50~0.60%, Ni: 0.60~0.70%, Al: 0.020~0.040%, and the rest are Fe and unavoidable impurities; The production method includes smelting, heating, rolling, complete annealing, cutting riser and sampling, and heat treatment processes. The invention adopts reasonable alloy composition design, combined with annealing before heat treatment and heat treatment process of quenching+tempering, ensures high hardness of the steel plate, and at the same time has a relatively high margin of strength and toughness.

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 Patents(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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