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A kind of q690cf hot-rolled steel plate and its preparation method

A hot-rolled steel plate and steel ingot technology, which is applied in the field of Q690CF hot-rolled steel plate and its preparation, can solve the problems of high energy consumption, low yield strength level of target steel, unfavorable production efficiency, etc., and achieve simple production process, good welding performance, The effect of stable mechanical properties

Active Publication Date: 2017-10-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this production method also consumes a lot of energy, which is not conducive to improving production efficiency
In addition, the target steel yield strength levels involved in these three patents are much lower than 690MPa
[0008] For patents CN101481774A and CN101353759A, although these two patents use the TMCP process to prepare low welding crack sensitivity steel, the steel grades involved are only 500MPa and 550MPa grades

Method used

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  • A kind of q690cf hot-rolled steel plate and its preparation method
  • A kind of q690cf hot-rolled steel plate and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation method of Q690CF hot-rolled steel plate of the present invention comprises the steps:

[0055] Step 1, smelting:

[0056] According to the chemical composition of No. 1 Q690CF hot-rolled steel plate in Table 1, it was smelted in an electric furnace at a melting temperature of 1670°C and cast into a steel ingot with a thickness of 110mm;

[0057] Step 2, preprocessing:

[0058] Heat the steel ingot to 1200°C and hold for 80 minutes;

[0059] Step 3, hot rolling:

[0060] Rolling is controlled in two stages:

[0061] The starting rolling temperature of the rough rolling is 1080°C, 3 passes of rolling, the cumulative pass reduction rate is 55%, the final rolling temperature is 1060°C, and the thickness of the intermediate billet is 50mm;

[0062] After the temperature reaches 860°C on the roller table, finish rolling is carried out, rolling for 7 passes, the cumulative pass reduction rate is 76%, the final rolling temperature is 800°C, and the thickness...

Embodiment 2

[0066] The preparation method of Q690CF hot-rolled steel plate of the present invention comprises the steps:

[0067] Step 1, smelting:

[0068] According to the chemical composition of No. 1 Q690CF hot-rolled steel plate in Table 1, it was smelted in a converter at a melting temperature of 1560°C and cast into a slab of 130mm;

[0069] Step 2, preprocessing:

[0070] Heat the billet to 1150°C and hold for 120 minutes;

[0071] Step 3, hot rolling:

[0072] Rolling is controlled in two stages:

[0073] The initial rolling temperature of the rough rolling is 1100°C, 3 passes of rolling, the cumulative pass reduction rate is 46%, the final rolling temperature is 1050°C, and the thickness of the intermediate billet is 70mm;

[0074] After the temperature reaches 840°C on the roller table, finish rolling is carried out, rolling for 6 passes, the cumulative pass reduction rate is 69%, the final rolling temperature is 810°C, and the steel plate thickness is 22mm;

[0075] Step ...

Embodiment 3

[0078] The preparation method of Q690CF hot-rolled steel plate of the present invention comprises the steps:

[0079] Step 1, smelting:

[0080] According to the chemical composition of the No. 2 Q690CF hot-rolled steel plate in Table 1, it was smelted in a converter at a melting temperature of 1600 ° C, and cast into a slab with a thickness of 110 mm;

[0081] Step 2, preprocessing:

[0082] Heat the billet to 1180°C and hold for 60 minutes;

[0083] Step 3, hot rolling:

[0084] Rolling is controlled in two stages:

[0085] The starting rolling temperature of the rough rolling is 1070°C, 2 passes of rolling, the cumulative pass reduction rate is 45%, the final rolling temperature is 1000°C, and the thickness of the intermediate billet is 60mm;

[0086] After the temperature reaches 830°C on the roller table, finish rolling is carried out, rolling for 7 passes, the cumulative pass reduction rate is 77%, the final rolling temperature is 790°C, and the thickness of the stee...

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Abstract

A Q690CF hot-rolled steel plate and its preparation method. The chemical composition of the hot-rolled steel plate is: C: 0.05-0.08%, Si: 0.22-0.30%, Mn: 1.6-2.0%, Al: 0.2-0.35%, Cr :0.10~0.35%, Mo:0.20~0.35%, Ni:0.1~0.4%, Cu:0.15~0.3%, Nb:0.025~0.045%, V:0.01~0.03%, Ti:0.005~0.03%, P≤ 0.010%, S≤0.008%, the balance is Fe and unavoidable impurities. Preparation method: smelting; pretreatment; hot rolling: multi-pass rough rolling and finishing rolling; rapid cooling. The hot-rolled steel plate of the invention has high strength, good low-temperature toughness and welding performance, and realizes welding without preheating; the preparation cost is low and the process is simple.

Description

technical field [0001] The invention belongs to the field of high-strength steel production technology development, and in particular relates to a Q690CF hot-rolled steel plate and a preparation method thereof. Background technique [0002] In recent years, steel structure projects have developed towards large-scale, lightweight, and high-parameterization, such as long-span bridges, large hydropower stations, and heavy construction machinery. This requires structural steels with higher strength, better toughness, ductility and weldability. The use of high-strength structural steel in the construction of large-scale projects means that the cost of raw materials and the weight of materials can be reduced while meeting high-load conditions. However, high-strength structural steel often brings about a reduction in toughness. In addition, for high-strength quenched and tempered steels, the addition of a large number of alloying elements will seriously deteriorate its weldabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D8/02
Inventor 兰亮云孔祥伟邱春林胡智勇赵德文
Owner NORTHEASTERN UNIV LIAONING