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Low-yield-ratio thick Q345R steel plate for pressure vessels and production method thereof

A low yield ratio and pressure vessel technology, applied in the field of materials, can solve the problems of high yield ratio and achieve the effects of low yield ratio, good economic benefits, and large safety reserve coefficient

Active Publication Date: 2014-10-29
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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  • Low-yield-ratio thick Q345R steel plate for pressure vessels and production method thereof
  • Low-yield-ratio thick Q345R steel plate for pressure vessels and production method thereof
  • Low-yield-ratio thick Q345R steel plate for pressure vessels and production method thereof

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 percentage) chemical composition of slab is: C0.15%, Si0.3%, Mn1.3%, P0 .02%, S0.003%, V0.015, Als0.017%, Ca0.0015%, 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 and hig...

Embodiment 2

[0055] Adopting thickness is 250mm slab, and slab furnace temperature is 1210 ℃, and slab heating time is 410 minutes, and the (weight percentage) chemical composition of slab is: C0.18%, Si0.45%, Mn1.55%, P0 .012%, S0.005%, V0.025%, Als0.027%, Ca0.003%, 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 strength....

Embodiment 3

[0062] Adopting thickness is 250mm slab, and slab furnace temperature is 1195 ℃, and slab heating time is 372 minutes, and the (weight percentage) chemical composition of slab is: C0.17%, Si0.35%, Mn1.43%, P0 .009%, S0.002%, V0.021, Als0.022%, Ca0.0019%, and 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 stee...

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Abstract

The invention discloses a low-yield-ratio thick Q345R steel plate for pressure vessels, which comprises the following chemical components in percentage by weight: 0.15-0.18% of C, 0.3-0.45% of Si, 1.3-1.55% of Mn, at most 0.02% of P, at most 0.005% of S, 0.015-0.025% of V, 0.0015-0.003% of Ca, 0.017-0.027% of Als, and the balance of iron and impurities. The invention also discloses a production method of the low-yield-ratio thick Q345R steel plate for pressure vessels. By adopting the low-cost composition design, the steel plate has favorable surface quality; and the low-yield-ratio thick Q345R steel plate can be produced by using proper heating, controlled rolling, controlled cooling and normalizing techniques.

Description

technical field [0001] The invention relates to a material technology, in particular to a Q345R steel plate for a pressure vessel with a low yield strength specific thickness specification and a production method thereof. 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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