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Low-cost Q345R steel plate and production method thereof

A production method and low-cost technology, applied in the field of material processing, can solve the problems of increasing labor load, increasing the cost of steel plates, reducing the yield of finished products, etc., and achieve good economic benefits, less fuel consumption, and loose process systems.

Active Publication Date: 2014-09-03
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the strength and toughness of the Q345R steel plate, microalloys such as Nb and V are generally added during production. The addition of Nb and V alloys will greatly increase the cost of the steel plate; Cleaning the surface of the slab will greatly increase the labor load of workers and reduce the yield of finished products

Method used

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  • Low-cost Q345R steel plate and production method thereof
  • Low-cost Q345R steel plate and production method thereof
  • Low-cost Q345R steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Adopting thickness is 250mm slab, and slab furnace temperature is 1170 ℃, and slab heating time is 280 minutes, and the (weight percentage) chemical composition of slab is: C0.16%, Si0.3%, Mn1.3%, P0 .02%, S0.003%, Als0.017%, Ca0.0015%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 30 mm. The detailed rolling and cold removal process are shown in Table 1, and the mechanical properties are shown in Table 2. The steel plate meets the requirements of the first-level flaw detection.

[0048] 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, with ferrite accounting for about 80%, the grain size of the steel plate is uniform, and there is no mixed crystal phenomenon. The body has good plasticity and toughness, so the steel plate with this structure ha...

Embodiment 2

[0054] Adopting thickness is 250mm slab, and slab furnace temperature is 1200 ℃, and slab heating time is 400 minutes, and the (weight percentage) chemical composition of slab is: C0.18%, Si0.4%, Mn1.5%, P0 .011%, S0.005%, Als0.027%, Ca0.0025%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 10 mm, the detailed rolling and cold removal process is shown in Table 3, and its mechanical properties are shown in Table 4. The steel plate meets the requirements of the first-level flaw detection.

[0055] 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, and ferrite accounts for about 80%. The grain size of the steel plate along the thickness direction is uniform, and there is no mixed crystal phenomenon. , and ferrite has good plasticity and toughness, so the st...

Embodiment 3

[0061] Adopting thickness is 250mm slab, and slab furnace temperature is 1195 ℃, and slab heating time is 363 minutes, and the (weight percentage) chemical composition of slab is: C0.17%, Si0.24%, Mn1.43%, P0 .008%, S0.002%, Als0.022%, Ca0.0018%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 26mm, the detailed rolling and cold removal process is shown in Table 5, and its mechanical properties are shown in Table 6. The steel plate meets the requirements of the first-level flaw detection.

[0062] 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 ferrite accounts for about 80%. The grain size of the steel plate along the thickness direction is uniform, and there is no mixed crystal phenomenon. , and ferrite has good plasticity and toughness, so the st...

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Abstract

The invention discloses a low-cost Q345R steel plate which comprises the following chemical components in percentage by weight: 0.16-0.18% of C, 0.2-0.3% of Si, 1.3-1.5% of Mn, at most 0.02% of P, at most 0.005% of S, 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-cost Q345R steel plate. The low-cost Q345R steel plate can be produced by proper heating, controlled rolling and controlled cooling; and no expensive alloy elements, such as Nb, V, Ti and the like, are added to the steel plate, so the production cost is low.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a low-cost Q345R steel plate and a production method thereof. Background technique [0002] Application number 201210182417.5, name The present invention discloses a steel plate for large thickness pressure vessels and its preparation method. The chemical composition of the steel plate for large thickness pressure vessels is smelted from the following components by weight percentage: C: 0.15%-0.18% , Si: 0.25%-0.50%, Mn: 1.50%-1.60%, P≤0.020%, S≤0.005%, Nb: 0.030%-0.050%, Al: 0.020%-0.050%; steel plate structure is ferrite, Pearlite organization. The chemical composition design of the steel plate of the present invention adopts low-cost carbon and manganese solid-solution strengthening, adds a small amount of alloy elements, and obtains the steel plate through water cooling and accelerated cooling after normalizing. [0003] Q345R steel plate is the main material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 温利军丁晓志刘海涛董瑞峰徐建东赵超
Owner INNER MONGOLIA BAOTOU STEEL UNION
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