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Method for producing low-cost 20CrMoA round steel by omitting VD process in combination with component optimization

A low-cost, round steel technology, applied in the direction of temperature control, etc., can solve the problems of reducing tons of steel, high production costs, and not seen in technical reports, and achieve the effect of reducing the cost of tons of steel and saving costs

Active Publication Date: 2021-11-09
LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current production of 20CrMoA round steel follows traditional conventional methods, resulting in high production costs; with the intensification of market competition, reducing the cost per ton of steel is an urgent technical problem to be solved
Moreover, there is no corresponding technical report in the published literature at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The composition of the present invention: C: 0.19%, Si: 0.24%, Mn: 0.60%, P: 0.015%, S: 0.001%, Cr: 0.95%, Ni: 0.02%, Mo: 0.16%, Cu: 0.02%, Alt : 0.18%; the balance is Fe and unavoidable impurities.

[0050] The steps of the invention include converter smelting, LF refining, continuous casting, slab cooling, heating, high-temperature shearing, and hot steel collection.

[0051] (1) Converter smelting: tapped carbon content 0.10%, tapped phosphorus content P: 0.014%, tapped temperature T: 1606°C;

[0052] (2) LF refining: use aluminum beans and silicon carbide deoxidizers to ensure that the white slag time is 22 minutes, the soft blowing intensity is 40-60NL / min, and the time is 15 minutes;

[0053] (3) Protective pouring is used throughout the continuous casting process, with a superheat of 30°C and a specific water volume of 3.0L / kg; M-EMS parameters are 400A / 2HZ, and F-EMS parameters are 300A / 10HZ. The continuous casting slab is subjected to wind-shelter stack cooli...

Embodiment 2

[0058] The composition of the present invention: C: 0.19%, Si: 0.25%, Mn: 0.63%, P: 0.016%, S: 0.002%, Cr: 0.92%, Ni: 0.02%, Mo: 0.18%, Cu: 0.02%, Alt : 0.18%; the balance is Fe and unavoidable impurities.

[0059] The steps of the invention include converter smelting, LF refining, continuous casting, slab cooling, heating, high-temperature shearing, and hot steel collection.

[0060] (1) Converter smelting: tapped carbon content 0.09%, tapped phosphorus content P: 0.013%, tapped temperature T: 1600°C;

[0061] (2) LF refining: use aluminum beans and silicon carbide deoxidizers to ensure that the white slag time is 25 minutes, the soft blowing intensity is 40-60NL / min, and the time is 18 minutes;

[0062] (3) Protective pouring is used throughout the continuous casting process, superheat is 25°C, specific water volume is 3.0L / kg; M-EMS parameters are 400A / 2HZ, F-EMS parameters are 300A / 10HZ; 220mm square billet;

[0063] (4) The total heating time of the slab is 326 minutes...

Embodiment 3

[0067] The composition of the present invention: C: 0.20%, S: 0.23%, Mn: 0.60%, P: 0.017%, S: 0.006%, Cr: 1.00%, Ni: 0.01%, Mo: 0.17%, Cu: 0.02%, Alt : 0.16%; the balance is Fe and unavoidable impurities.

[0068] The steps of the invention include converter smelting, LF refining, continuous casting, slab cooling, heating, high-temperature shearing, and hot steel collection.

[0069] (1) Converter smelting: tapped carbon content 0.12%, tapped phosphorus content P: 0.014%, tapped temperature T: 1610°C;

[0070] (2) LF refining: use aluminum beans and silicon carbide deoxidizer, white residue time 25min, soft blowing intensity 40-60NL / min, time 19min;

[0071] (3) Protective pouring is used throughout the continuous casting process, the superheat is controlled at 27°C, and the specific water volume is 3.0L / kg. The parameters of M-EMS are 400A / 2HZ, and the parameters of F-EMS are 300A / 10HZ; the time for continuous casting slab to be sheltered from the wind is 36h, and the conti...

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Abstract

The invention belongs to the technical field of round steel production, and relates to a method for producing low-cost 20CrMoA round steel by omitting a VD process in combination with component optimization. The steel comprises 0.19-0.20% of C, 0.60-0.63% of Mn, 0.23-0.25% of Si, 0.16-0.18% of Mo, 0.92-1.00% of Cr, less than or equal to 0.30% of Ni, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.20% of Cu, 0.16-0.18% of Alt, and the balance Fe and inevitable impurities. The method comprises the steps of converter smelting, LF refining, continuous casting, stack cooling, heating, high-temperature shearing, and hot steel collection. By optimizing the components and the process, the cost per ton of steel is reduced while the performance of the steel is ensured; and the problems that center segregation exists in a continuous casting billet and center cracks are generated at the end of steel due to an improper cooling process during rolling are effectively solved, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of round steel production, and in particular relates to a method for producing low-cost 20CrMoA round steel by reducing the VD process and optimizing components. Background technique [0002] 20CrMoA is a commonly used alloy structural steel with high hardenability, which has high strength, good toughness, good cold strain plasticity, and no obvious temper brittleness. After quenching and tempering or carburizing treatment, it has high fatigue limit and impact resistance, and has good comprehensive mechanical properties. It is widely used in processing high-pressure pipes and fasteners, gears, shafts and other mechanical parts. [0003] However, the current production of 20CrMoA round steel follows traditional methods, resulting in high production costs; with the intensification of market competition, reducing the cost per ton of steel is a technical problem that needs to be solved urgently. Moreover, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/42C22C38/44B21B37/74C21C7/06B22D11/115
CPCC22C33/04C21C7/0006C21C7/06C22C38/02C22C38/04C22C38/22C22C38/20C22C38/06C22C38/44C22C38/42B21B37/74B22D11/115
Inventor 寿先涛陈振芳张勇
Owner LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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