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30MnSi wire rod steel and preparation method thereof

A wire rod and bar steel technology, applied in the field of 30MnSi wire rod steel and its preparation, can solve problems such as steel weight loss, and achieve the effects of low mold damage, excellent scale thickness and peeling performance, and high surface quality

Pending Publication Date: 2022-03-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if the iron oxide scale is too thick, it will cause the loss of steel weight. Therefore, it is necessary to control the thickness of the iron oxide scale and the structure within a reasonable range, so as to ensure that the iron oxide scale is easy to peel off and reduce the weight loss as much as possible.

Method used

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  • 30MnSi wire rod steel and preparation method thereof
  • 30MnSi wire rod steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The chemical composition and mass percentage of 30MnSi wire rod for PC rods are: C: 0.28%, Si: 0.85%, Mn: 0.95%, Si / Mn: 0.89, P: 0.010%, S: 0.009%, and the balance is Fe and Unavoidable impurities.

[0051] The production process of 30MnSi wire rod for PC rod is as follows:

[0052] Molten iron→converter smelting→alloy addition→LF refining→continuous casting into billet→heating in heating furnace→controlled rolling→controlled air cooling.

[0053] The steelmaking process and control are as follows: alloy is added at the end of the converter, continuous casting adopts full protection pouring, and the superheat is 30°C.

[0054] The steel rolling process and control are as follows: the temperature of the heating section of the heating furnace is 980°C, the temperature of the soaking section is 1070°C, the time in the furnace is 2 hours, the starting temperature of rolling is 985°C, the entrance temperature of finishing rolling is 900°C, the spinning temperature is 910°C,...

Embodiment 2

[0056] The chemical composition and mass percentage of 30MnSi wire rod for PC rod are: C: 0.29%, Si: 0.93%, Mn: 1.00%, Si / Mn: 0.93, P: 0.013%, S: 0.012%, and the balance is Fe and Unavoidable impurities.

[0057] The production process of 30MnSi wire rod for PC rod is as follows:

[0058] Molten iron→converter smelting→alloy addition→LF refining→continuous casting into billet→heating in heating furnace→controlled rolling→controlled air cooling.

[0059] The steelmaking process and control are as follows: alloy is added at the end of the converter, continuous casting adopts full protection pouring, and the superheat is 30°C.

[0060] The steel rolling process and control are as follows: the temperature of the heating section of the heating furnace is 1050°C, the temperature of the soaking section is 1090°C, the time in the furnace is 2 hours, the starting temperature of rolling is 1000°C, the entrance temperature of finishing rolling is 920°C, the spinning temperature is 925°C...

Embodiment 3

[0062] The chemical composition and mass percentage of 30MnSi wire rod for PC rods are: C: 0.30%, Si: 0.98%, Mn: 1.04%, Si / Mn: 0.94, P: 0.018%, S: 0.019%, and the balance is Fe and Unavoidable impurities.

[0063] The production process of 30MnSi wire rod for PC rod is as follows:

[0064] Molten iron→converter smelting→alloy addition→LF refining→continuous casting into billet→heating in heating furnace→controlled rolling→controlled air cooling.

[0065] The steelmaking process and control are as follows: alloy is added at the end of the converter, continuous casting adopts full protection pouring, and the superheat is 30°C.

[0066] The steel rolling process and control are as follows: the temperature of the heating section of the heating furnace is 1120°C, the temperature of the soaking section is 1120°C, the time in the furnace is 2 hours, the starting temperature of rolling is 1030°C, the entrance temperature of finishing rolling is 940°C, the spinning temperature is 940°...

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Abstract

The invention particularly relates to 30MnSi wire rod steel and a preparation method thereof, and belongs to the technical field of steel preparation. The method comprises the steps that molten iron is subjected to converter smelting, and molten steel is obtained; refining the molten steel to obtain refined molten steel; continuously casting the molten steel to obtain a steel billet; heating the steel billet to obtain a steel billet to be rolled; in the heating process, the temperature of a heating section ranges from 970 DEG C to 1120 DEG C, the temperature of a soaking section ranges from 1060 DEG C to 1120 DEG C, and the whole heating time ranges from 1.5 h to 2.5 h; the steel billet to be rolled is subjected to controlled rolling and then subjected to controlled air cooling, and wire rod steel is obtained; in the controlled rolling process, the initial rolling temperature ranges from 980 DEG C to 1030 DEG C, the finish rolling inlet temperature ranges from 900 DEG C to 940 DEG C, the spinning temperature ranges from 910 DEG C to 940 DEG C, control over the temperature of a heating section and the temperature of a soaking section of a heating furnace, the initial rolling temperature, the finish rolling inlet temperature, the spinning temperature and the like are optimized, and the produced 30MnSi wire rod for the PC rod is excellent in structure, mechanical property, oxide scale thickness and stripping performance. The method is suitable for manufacturing PC rods with high surface quality and low mold damage.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, in particular to a 30MnSi wire rod steel and a preparation method thereof. Background technique [0002] During the transportation and storage of 30MnSi wire rods for PC rods, the iron oxide scale on the surface can protect the matrix from damage and continue to oxidize. Excessively hard oxide scale will damage the surface quality of the wire rod, press into the wire rod matrix to cause brittle wire breakage during drawing, and sometimes damage the surface of the drawing die, resulting in wear and scrapping of the drawing die. Therefore, it is necessary to study how to improve the scale peeling property of 30MnSi wire rods for PC rods. [0003] The detachment of iron oxide scale refers to the difficulty of detaching iron oxide scale from the steel matrix and whether it can be completely detached. The scale structure of 30MnSi wire rod for hot-rolled PC rods is FeO, Fe 3 o 4 and Fe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C22C38/02C22C38/04
CPCC21D8/065C22C38/02C22C38/04C21D2211/005C21D2211/009Y02P10/20
Inventor 周玉丽李舒笳邓素怀邸全康晁月林周洁宫翠刘洋洋王勇代锦韩伟朱金禄修井明
Owner SHOUGANG CORPORATION
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