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A low compression ratio, high-performance q 345R ultra-wide and extra-thick container steel and its manufacturing method

A technology with low compression ratio and manufacturing method, which is applied in the field of high-performance Q345R ultra-wide and extra-thick container steel, which can solve the problems of limited ambient temperature for container use, and achieve excellent strength and Z-direction performance, high compactness, and Z-direction performance excellent effect

Active Publication Date: 2021-05-25
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this technology include: 1. The thickness of the steel plate produced is 60-100mm; 2. The actual performance of the steel plate is only the performance data of the steel plate in the delivery state, and there is no performance data of the simulated post-weld heat treatment state; 3. Only 200°C is displayed. High-temperature tensile properties are qualified, and the ambient temperature of containers made of steel plates is limited

Method used

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  • A low compression ratio, high-performance q 345R ultra-wide and extra-thick container steel and its manufacturing method
  • A low compression ratio, high-performance q 345R ultra-wide and extra-thick container steel and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3960mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.

[0024] The manufacturing process of the steel plate is to configure the smelting raw materials according to the chemical composition of the above-mentioned steel plate products. (1) Smelting and continuous casting: the smelting raw materials are pretreated by KR molten iron in sequence, and the converter smelting: the converter tapping P≤0.010%, and the converter tapping temperature is 1610~1650℃; LF refining: white slag retention time is not less than 25min, total refining time is not less than 45min, slag removal when molten steel S≤0.005%; RH vacuum degassing refining: vacuum degree ≤0.5mbar, ...

Embodiment 2

[0027] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3960mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.

[0028] The production method of steel plate is basically the same as the production method of embodiment 1, but there are differences in the state of the test sample blank, and the specific differences are as follows:

[0029] In order to simulate the post-weld heat treatment process of the steel plate, after the sample blank is removed from the steel plate, it is first kept in a small furnace at 620°C for 4 hours, that is, the minimum post-weld heat treatment is simulated, and then the mechanical properties are tested.

[0030] Experiments prove that the steel plate of the present invention has...

Embodiment 3

[0032] The high-performance ultra-wide and extra-thick Q345R steel plate of this embodiment has a thickness of 120mm and a width of 3880mm, and its chemical composition is calculated by mass percentage: C: 0.16%, Si: 0.25%, Mn: 1.32%, P: 0.008%, S: 0.003%, Nb: 0.030%, Ni: 0.20%, Alt: 0.030%, H: 0.00012%, O: 0.0015%, N: 0.0035%, and the balance is Fe and unavoidable impurity elements.

[0033] The steel plate is that the production method is basically the same as the production method of embodiment 1, but there are differences in the state of the inspection sample blank, and the specific differences are as follows:

[0034] In order to simulate the post-weld heat treatment process of the steel plate, after the sample blank is removed from the steel plate, it is first kept in a small furnace at 620°C for 12 hours, which is the maximum simulated post-weld heat treatment, and then the mechanical properties are tested.

[0035] Experiments prove that the steel plate of the present ...

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Abstract

The invention relates to a low-compression-ratio, high-performance Q345R ultra-wide and extra-thick container steel, which is combined with a continuous casting process. The production process route is: molten iron pretreatment→converter steelmaking→external refining→vacuum degassing→slab continuous casting→billet Stack slow cooling→heating→rolling→steel stack slow cooling→ultrasonic flaw detection→normalizing→ultrasonic flaw detection→air cooling→finishing. The thickness of the steel plate can reach 101-120mm, and the width can reach 3500-4050mm. The core performance is excellent: the low-temperature impact value at ‑29°C is over 100J, which exceeds the requirement of "-20°C impact energy ≥ 41J" stipulated in the GB / T 713‑2014 standard, 450 The high-temperature tensile properties meet the requirements of Table 3 in GB / T713-2014, and the Z-direction performance is excellent: exceeding the standard's highest requirement of 35% for the Z-direction performance of steel plates. The uniform mechanical properties of the steel plate indicate that the steel is very compact and meets the stringent requirements for the mechanical properties and uniform structure of the large-thickness steel core and the entire plate; after the simulated post-weld heat treatment of the steel plate, the structure remains uniform and the core There is no obvious fluctuation in the tensile and core impact properties.

Description

technical field [0001] The invention relates to a steel plate for a pressure vessel, in particular to a high-performance Q 345R ultra-wide and extra-thick vessel steel produced with a low compression ratio. Background technique [0002] With the rapid development of my country's petrochemical industry, the design and manufacture of pressure vessels are developing in the direction of large thickness and high parameterization, which puts forward higher requirements for the safety of pressure vessels. And specifications put forward more stringent requirements. Among them, Q345R is used as steel for pressure vessels, which is equivalent to the grade SA516Gr70 in ASME SA516 / SA516M-2017. With its good low-temperature impact performance and process performance, it is widely used in the manufacture of large-scale equipment with harsh operating conditions such as petroleum and chemical industries. [0003] With the development of wide and thick plate production technology, the techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/08C22C38/06C22C38/16C22C38/38C22C38/26C22C38/22C22C38/20C22C38/58C22C38/48C22C38/44C22C38/42C21D8/02C21D1/28C22C33/04C21C7/10
CPCC21C7/10C21D1/28C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/20C22C38/22C22C38/26C22C38/38C22C38/42C22C38/44C22C38/48C22C38/58
Inventor 张军钱刚许晓红白云李经涛苗丕峰张建刘海宽孟宪震
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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