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Production method of q345r steel plate for pressure vessel with low yield ratio and thickness

A low-yield-to-strength ratio, pressure vessel technology, applied in the field of materials, can solve the problem of high yield-strength ratio, and achieve the effects of low yield-strength ratio, positive social benefits, and good surface quality

Active Publication Date: 2016-08-24
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not involve the production of steel plates with a thickness of more than 80 mm, and its yield ratio is relatively high

Method used

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  • Production method of q345r steel plate for pressure vessel with low yield ratio and thickness
  • Production method of q345r steel plate for pressure vessel with low yield ratio and thickness
  • Production method of q345r steel plate for pressure vessel with low yield ratio and thickness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Adopting thickness is 250mm slab, and slab furnace temperature is 1180 ℃, and slab heating time is 270 minutes, and the (weight percent) chemical composition of slab is: C 0.15%, Si 0.3%, Mn 1.3%, P 0.02%, S 0.003%, V 0.015%, Als 0.017%, Ca 0.0015%, and the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 50 mm, the detailed rolling, cooling, and normalizing processes are shown in Table 1, and its mechanical properties are shown in Table 2.

[0049] Such as figure 1 Shown is the metallographic structure diagram of the steel plate in Example 1 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the steel plate with this structure has good toughness an...

Embodiment 2

[0055] Adopting thickness is 250mm slab, and slab furnace temperature is 1210 ℃, and slab heating time is 410 minutes, and the (weight percent) chemical composition of slab is: C 0.18%, Si 0.45%, Mn 1.55%, P 0.012%, S 0.005%, V 0.025%, Als 0.027%, Ca 0.003%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 100 mm, the detailed rolling and cold removal process is shown in Table 3, and its mechanical properties are shown in Table 4.

[0056] Such as figure 2 Shown is the metallographic structure diagram of the steel plate in Example 2 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the steel plate with this structure has good toughness and high stren...

Embodiment 3

[0062] Adopting thickness is 250mm slab, and slab furnace temperature is 1195 ℃, and slab heating time is 372 minutes, and the (weight percent) chemical composition of slab is: C 0.17%, Si 0.35%, Mn 1.43%, P 0.009%, S 0.002%, V 0.021%, Als 0.022%, Ca 0.0019%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 80 mm, the detailed rolling and cold removal process is shown in Table 5, and its mechanical properties are shown in Table 6.

[0063] Such as image 3 Shown is the metallographic structure diagram of the steel plate in Example 3 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, and the ferrite accounts for the majority. The grains of the steel plate are fine and uniform along the thickness direction, and there is no mixed crystal phenomenon. Due to the fine grains, ferrite is the majority, and ferrite has good plasticity and toughness, so the ste...

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Abstract

The invention discloses a production method of Q345R steel plates for pressure vessels with low yield strength ratio and thickness specifications, including smelting, continuous casting, slab reheating, steel plate rolling forming and normalizing treatment. The invention adopts low-cost component design, and the surface quality of the steel plate is good, and the Q345R steel plate with low yield strength and specific thickness specification can be produced through suitable heating, controlled rolling, controlled cooling and normalizing processes.

Description

technical field [0001] The invention relates to a material technology, in particular to a production method of a Q345R steel plate for a pressure vessel with a low yield strength ratio and thickness specification. Background technique [0002] Q345R steel plate is the main material for the production of pressure vessels in my country, and is widely used in the production of various pressure gas tanks, reactors, gas cylinders and other products. As the Q345R steel plate is used more and more widely, the user's demand for the thickness of the Q345R steel plate is also getting thicker. Steel for pressure vessels generally requires high strength, good plasticity and toughness, and as the thickness of the steel plate increases, the compression ratio during rolling decreases, and the comprehensive mechanical properties of the steel plate generally decrease. In the case of a certain yield strength, the lower the yield ratio of the steel plate, the more energy absorbed when breakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 温利军董瑞峰张大治刘海涛吴鹏飞徐建东
Owner INNER MONGOLIA BAOTOU STEEL UNION
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