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A kind of copper-containing ultra-low carbon bainite steel and preparation method thereof

A carbon bainite steel and bainite technology, which is applied in the field of copper-containing ultra-low carbon bainite steel and its preparation, can solve the problems of narrow production window and large performance fluctuation, and achieve simple composition and excellent welding performance. , the effect of increasing strength

Active Publication Date: 2021-02-09
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of the above analysis, the embodiment of the present invention aims to provide a copper-containing ultra-low carbon bainitic steel and its preparation method to solve the existing problems of narrow production window and large performance fluctuations

Method used

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  • A kind of copper-containing ultra-low carbon bainite steel and preparation method thereof
  • A kind of copper-containing ultra-low carbon bainite steel and preparation method thereof
  • A kind of copper-containing ultra-low carbon bainite steel and preparation method thereof

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preparation example Construction

[0048] The invention provides a preparation method of copper-containing ultra-low carbon bainite steel, which uses a heating furnace for heating and smelting, and continuous casting or mold casting for casting. Such as figure 1 As shown, within the cooling rate range in the CCT curve, the bainite steel prepared by the present invention has only passed through the bainite phase region without the ferrite phase region, and the ultra-low carbon bainite steel prepared by the method provided by the invention The body steel can obtain pure bainite structure in a wide cooling rate range, and the bainite platform is wide. Above-mentioned preparation method comprises the following steps:

[0049] Step 1: heating and forging the steel ingot to obtain a steel billet;

[0050] The forging heating temperature is 1180°C-1200°C, the starting forging temperature is 1150°C-1160°C, and the final forging temperature is >850°C to obtain a billet. If the forging temperature is too high, it is e...

Embodiment 1

[0064] Such as figure 2 As shown, the chemical composition and content of copper-containing ultra-low carbon bainite steel are: C: 0.010%, Mn: 1.27%, Mo: 1.56%, Nb: 0.03%, Ni: 3.10%, Cr: 0.50%, B: 0.0010%, Cu: 1.43%, and the balance is iron and unavoidable impurities. Its preparation method comprises the following steps:

[0065] Step 1: heating and forging the steel ingot with the above composition to obtain a steel billet;

[0066] The forging heating temperature is 1180°C, the starting forging temperature is 1150°C, and the final forging temperature is 880°C to obtain a billet.

[0067] Step 2: putting the billet obtained in step 1 into a heating furnace for heating;

[0068] The heating temperature is 1180°C, and the heating time is 2h.

[0069] Step 3: Rough rolling and finishing rolling of the heated billet;

[0070] The steel billet is rolled. In the rolling process, there are 2 rough rolling passes, the deformation of the first pass is 25.1%, the deformation of t...

Embodiment 2

[0077] The chemical composition and content of copper-containing ultra-low carbon bainite steel are: C: 0.021%, Mn: 0.80%, Mo: 1.50%, Nb: 0.056%, Ni: 3.00%, Cr: 0.40%, B: 0.0017 %, Cu: 1.40%, and the rest are iron and unavoidable impurities. Its preparation method comprises the following steps:

[0078] Step 1: heating and forging the steel ingot to obtain a steel billet;

[0079] The forging heating temperature was 1185°C, the starting forging temperature was 1155°C, and the final forging temperature was 900°C to obtain a billet.

[0080] Step 2: putting the billet obtained in step 1 into a heating furnace for heating;

[0081] The heating temperature is 1200°C, and the heating time is 2h.

[0082] Step 3: Rough rolling and finishing rolling of the heated billet;

[0083] Rough rolling and finish rolling are carried out on the billet. There are 2 passes of rough rolling, the deformation of the first pass is 25.3%, the deformation of the second pass is 24.2%, and the cumul...

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Abstract

The invention relates to a copper-containing ultra-low-carbon bainitic steel and a preparation method thereof, which belong to the technical field of metal materials and solve the problem of the narrow production window of the existing copper-containing ultra-low-carbon bainitic steel and the large difference in the center of the surface of wide and thick plates , The problem of large performance fluctuations. The invention provides a copper-containing ultra-low carbon bainite steel, the chemical composition of which includes by weight: C: 0.01%-0.03%, Mn: 0.8%-1.5%, Mo: 1.5%-2.0%, Nb: 0.03% ~0.07%, Ni: 3.0%~4.0%, Cr: 0.4%~0.6%, B: 0.0010%~0.0018%, Cu: 1.4%~1.6%, and the rest are iron and unavoidable impurities. The invention realizes good production adaptability and stable microstructure and performance of the ultra-low carbon bainite steel.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a copper-containing ultra-low carbon bainite steel and a preparation method thereof. Background technique [0002] Ultra-low carbon bainitic steel is a large class of high-strength, high-toughness, multi-purpose steel newly developed in the world in the past 20 years. The alloy design idea of ​​ultra-low carbon bainitic steel is different from the original high-strength low-alloy steel. In the ultra-low carbon bainitic steel, the carbon content is greatly reduced, and the influence of carbon on the toughness and welding performance of the steel is eliminated. At present, ultra-low carbon bainitic steel has been widely used in oil pipelines, ships, large structural parts and marine facilities and other fields. [0003] Although ultra-low carbon bainitic steel has the advantages of good strength-toughness matching and excellent welding performance, there are still some di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/48C22C38/44C22C38/42C22C38/04C21D8/02C21D1/18
CPCC21D1/18C21D8/0205C21D8/0221C21D8/0247C22C38/04C22C38/42C22C38/44C22C38/48C22C38/54
Inventor 王天琪杨才福柴希阳柴锋罗小兵梁丰瑞师仲然
Owner CENT IRON & STEEL RES INST
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