Low-compression-ratio high-performance Q345R super-wide extremely thick container steel and manufacturing method thereof

A technology with a low compression ratio and a manufacturing method, which is applied in the field of high-performance Q345R ultra-wide and extra-thick container steel, can solve the problems of limited environmental temperature of the container, achieve excellent strength and Z-direction performance, uniform mechanical properties, and short production cycle Effect

Active Publication Date: 2019-11-12
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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  • Low-compression-ratio high-performance Q345R super-wide extremely thick container steel and manufacturing method thereof
  • Low-compression-ratio high-performance Q345R super-wide extremely thick container steel and manufacturing method thereof

Examples

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 low-compression-ratio high-performance Q345R super-wide extremely thick container steel. In cooperation with a continuous casting process, the production process route comprises hot metal pretreatment, converter steelmaking, external refining, vacuum degassing, slab continuous casting, blank pile slow cooling, heating, rolling, steel plate pile slow cooling, ultrasonic flaw detection, normalization, ultrasonic flaw detection, air cooling and finishing. The thickness of a steel plate can reach 101 mm to 120 mm, and the width of the steel plate can reach 3500 mm to 4050mm. The core performance is excellent, wherein the low-temperature impact value at -29 DEG C is 100 J or above and exceeds the requirement of the ballistic work larger than or equal to 41 J at the temperature of -20 DEG C specified by the standard GB/T713-2014, and the high-temperature tensile performance at 450 DEG C meets the requirement of a table 3 in GB/T713-2014; and the Z-direction performance is excellent and exceeds the highest requirement of the standard for the Z-direction performance 35% of the steel plate. The steel plate is uniform in overall mechanical property, and it is indicated that the steel plate is very high in compactness and meets the strict requirement for the mechanical property and structural uniformity of the core and whole plate of large-thickness steel; and after the steel plate is subjected to simulated post-welding heat treatment, the structure is still kept uniform, and the core tensile performance and core impact performance do not obviously fluctuate.

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 Applications(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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