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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 large performance fluctuations and narrow production windows, and achieve excellent welding performance and simple composition , good toughness effect

Active Publication Date: 2020-02-28
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Copper-containing ultra-low carbon bainite steel and preparation method thereof
  • Copper-containing ultra-low carbon bainite steel and preparation method thereof
  • 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 copper-containing ultra-low carbon bainite steel and a preparation method thereof, and belongs to the technical field of metal materials. The problems that an existing copper-containing ultra-low carbon bainite steel production window is narrow, the surface core difference of a wide and thick plate is large, and the performance fluctuation is large are solved. The copper-containing ultra-low carbon bainite steel comprises, by mass, 0.01%-0.03% of C, 0.8%-1.5% of Mn, 1.5%-2.0% of Mo, 0.03%-0.07% of Nb, 3.0%-4.0% of Ni, 0.4%-0.6% of Cr, 0.0010%-0.0018% of B, 1.4%-1.6% ofCu and the balance iron and inevitable impurities. The ultra-low carbon bainite steel is good in production adaptability and stable in tissue performance.

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 Applications(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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