Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof

A technology of extra-thick steel plate and high toughness, which is applied in the field of low-carbon high-toughness extra-thick container steel plate and its manufacturing. It can solve the problems of affecting the use and poor low-temperature toughness of the steel plate, and achieves short production cycle, excellent core performance and compactness. high effect

Active Publication Date: 2015-10-21
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low-temperature toughness of the steel plate over 100mm is poor, and usually only guarantees low-temperature impact performance higher than -10°C, which seriously affects the use of this steel in hydrogen-facing equipment in alpine regions. Therefore, how to design and Preparation method, it is very necessary to produce 1Cr0.5Mo that meets the low temperature impact performance requirements below -10°C

Method used

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  • Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof
  • Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The thickness of the low-carbon high-toughness extra-thick steel plate of this embodiment is 108 mm, and its chemical composition is calculated by mass percentage: C: 0.08%, Si: 0.20%, Mn: 0.45%, P: 0.004%, S: 0.002%, Ni: 0.38%, Cr: 1.10%, Cu: 0.03%, Mo: 0.55%, Sb: 0.001%, Sn: 0.001%, As: 0.001%, H: 0.00008%, O: 0.0014%, N: 0.0032%, The balance is Fe and unavoidable impurity elements.

[0022] 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≤0.008%, and the converter tapping temperature is 1610~1650℃, slag removal treatment; LF refining: white slag retention time not less than 25min, total refining time not less than 45min, slag removal when molten steel S≤0.003%; RH vacuum degassing refinin...

Embodiment 2

[0025]The thickness of the low-carbon high-toughness container steel plate of this embodiment is 108 mm, and its chemical composition is calculated by mass percentage: C: 0.10%, Si: 0.30%, Mn: 0.50%, P: 0.002%, S: 0.001%, Ni : 0.25%, Cr: 0.9%, Cu: 0.03%, Mo: 0.60%, Sb: 0.001%, Sn: 0.001%, As: 0.001%, H: 0.00008%, O: 0.0014%, N: 0.003%, Yu The amount is Fe and unavoidable impurity elements.

[0026] 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:

[0027] In order to simulate the post-welding stress-relieving 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 675°C for 4 hours, which is the minimum simulated post-weld heat treatment, and then the mechanical properties are tested.

[0028] Experiments prove that the steel plate of t...

Embodiment 3

[0030] The thickness of the low-carbon high-toughness container steel plate of this embodiment is 108 mm, and its chemical composition is calculated by mass percentage: C: 0.11%, Si: 0.20%, Mn: 0.6%, P: 0.004%, S: 0.002%, Ni : 0.32%, Cr: 1.15%, Cu: 0.03%, Mo: 0.45%, Sb: 0.001%, Sn: 0.001%, As: 0.001%, H: 0.0001%, O: 0.0012%, N: 0.0032%, Yu The amount is Fe and unavoidable impurity elements.

[0031] 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:

[0032] In order to simulate the post-welding stress-relieving heat treatment process of the steel plate, after the sample blank is taken from the steel plate, it is first kept in a small furnace at 675°C for 12 hours, which is the maximum simulated post-weld heat treatment, and then the mechanical properties are tested.

[0033] Experiments prove that the s...

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Abstract

The invention discloses a large-thickness high-tenacity vessel steel plate, comprising the following chemical components by mass percent: 0.08 to 0.12 percent of C, 0.15 to 0.40 percent of Si, 0.40 to 0.70 percent of Mn, smaller than or equal to 0.005 percent of P, smaller than or equal to 0.003 percent of S, smaller than or equal to 0.40 percent of Ni, smaller than or equal to 0.20 percent of Cu, 0.80 to 1.20 percent of Cr, 0.45 to 0.60 percent of Mo, smaller than or equal to 0.003 percent of Sb, smaller than or equal to 0.010 percent of Sn, smaller than or equal to 0.012 percent of As, smaller than or equal to 0.0002 of H and the balance of Fe and investable impurity elements. The prepared low-carbon high-tenacity steel plate has the advantages that the thickness can reach 100 to 110 mm, the core part performance is excellent, particularly a low-temperature impact value at minus 38 DEG C is over 120J, and the Z-direction performance is good and is higher than the highest requirement, namely Z-direction performance being 35 percent, of a standard steel plate.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a low-carbon, high-toughness extra-thick container steel plate with a thickness of 100-110 mm and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's petrochemical, coal chemical and other industries, 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. The performance and specification of the steel plate put forward more stringent requirements. Among them, 1Cr0.5Mo is used as steel for medium and high temperature pressure vessels, which is equivalent to 15CrMoR in GB713-2014 and SA387Gr12CL2 in ASME SA387-2013. With its good high-temperature mechanical properties, high-temperature oxidation resistance, corrosion resistance, process performance and workability It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/44C22C38/22C21C7/00C21C7/10C21D8/02
Inventor 张建李经涛李国忠吴小林林涛孟宪震刘海宽赵琳张军
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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