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Nb microalloyed structural steel with excellent bending performance and manufacturing method thereof

A technology of micro-alloying and manufacturing method, applied in metal rolling and other directions, can solve the problems of poor plasticity and toughness of steel plates, and deteriorate the processing performance of steel plates, and achieve low carbon equivalent, excellent bending process performance, and easy process control. Effect

Inactive Publication Date: 2022-01-11
天津市新天钢钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in the plasticity and toughness properties of ferrite and pearlite, band segregation will lead to poor plasticity and toughness of the steel plate and deteriorate the processability of the steel plate

Method used

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  • Nb microalloyed structural steel with excellent bending performance and manufacturing method thereof
  • Nb microalloyed structural steel with excellent bending performance and manufacturing method thereof
  • Nb microalloyed structural steel with excellent bending performance and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of Nb micro-alloyed structural steel with excellent bending performance. Calculated by mass percentage, its melting composition is as follows: C: 0.15%; Si: 0.16%; Mn: 0.92%; Nb: 0.011%; Ti: 0.015%; Als : 0.025%; P: 0.015%; S: 0.005%; N: 0.0048%; the rest is Fe and unavoidable impurities.

[0043] Present embodiment relates to 10mm thickness low-alloy structural steel, the manufacturing method of this structural steel is as follows:

[0044] S1. Hot metal pretreatment: execute the deep desulfurization mode, and the molten iron S into the furnace is 0.005%. After spraying, remove slag for 4 minutes, add 100kg of slag-accumulating agent, stop for 3 minutes, and then remove slag for 5 minutes. The net slag removal time is 9 minutes. After removing slag, the bright surface reaches 100%;

[0045] S2. Smelting and continuous casting process: the final components of the converter smelting process include: C: 0.060%, S: 0.005%, P: 0.012%; the tapping temperature of the ...

Embodiment 2

[0052] A kind of Nb micro-alloyed structural steel with excellent bending performance. Calculated by mass percentage, its melting composition is as follows: C: 0.17%; Si: 0.36%; Mn: 1.01%; Nb: 0.017%; Ti: 0.018%; Als : 0.030%; P: 0.017%; S: 0.004%; N: 0.0042%; the rest is Fe and unavoidable impurities.

[0053] Present embodiment relates to 30mm thickness low-alloy structural steel, the manufacture method of this structural steel is as follows:

[0054] S1. Hot metal pretreatment: adopt the deep desulfurization mode, the target S content is 0.004%; increase the amount of Mg injection to ensure the desulphurization effect; remove slag for 5 minutes after the injection is completed, add 120kg of slag aggregation agent, stop for 3 minutes and then remove 6 minutes, The net slag removal time is 11 minutes, and the bright side reaches 100% after slag removal;

[0055] S2. Smelting and continuous casting process: the final composition of the converter smelting process, C: 0.070%, S...

Embodiment 3

[0062] A kind of Nb micro-alloyed structural steel with excellent bending performance. Calculated by mass percentage, its melting composition is as follows: C: 0.18%; Si: 0.39%; Mn: 1.09%; Nb: 0.019%; Ti: 0.019%; Als : 0.038%; P: 0.015%; S: 0.002%; N: 0.0030%; the rest is Fe and unavoidable impurities.

[0063] Present embodiment relates to 40mm thickness low-alloy structural steel, the manufacture method of this structural steel is as follows:

[0064] S1. Hot metal pretreatment: adopt the deep desulfurization mode, the target S content is 0.004%; increase the amount of Mg injection to ensure the desulphurization effect; remove slag for 5 minutes after the injection is completed, add 110kg of slag aggregation agent, stop for 3 minutes and then remove 5 minutes, The net slag removal time is 10 minutes, and the bright surface reaches 100% after slag removal;

[0065] S2. Smelting and continuous casting process: the final composition of the converter smelting process, C: 0.070%, ...

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Abstract

The invention belongs to the technical field of metal materials, and particularly relates to Nb microalloyed structural steel with excellent bending performance and a manufacturing method thereof. The Nb microalloyed structural steel comprises the following smelting components of 0.15-0.18% of C, 0.15-0.40% of Si, 0.90-1.10% of Mn, 0.010-0.020% of Nb, 0.010-0.020% of Ti, 0.015-0.040% of Als, less than or equal to 0.018% of P, less than or equal to 0.005% of S and less than or equal to 0.0050% of N. According to the Nb microalloyed structural steel with the excellent bending performance and the manufacturing method thereof, the component design of medium C-low Mn-micro Nb is adopted, a two-stage controlled rolling and controlled cooling process is adopted, and a stacking slow cooling measure after rolling is adopted, so that the low-alloy structural steel with the thickness being less than or equal to 40mm, the yield strength being greater than or equal to 360MPa, the tensile strength being greater than or equal to 500MPa, the longitudinal impact energy at -40 DEG C being greater than or equal to 100J and the excellent bending process performance is produced.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a Nb microalloyed structural steel with excellent bending performance and a manufacturing method thereof. Background technique [0002] Bending is a forming process of cold stamping. The stress of the blank after being stressed exceeds the yield point of the material, and it becomes a processing process of a certain shape after plastic deformation. Bending of hot-rolled steel sheets is a relatively common processing method. When the material is bent, severe plastic deformation occurs at the bending fillet, that is, the outer layer is elongated and the inner layer is compressed. If the bending radius is too small, it will be easily cracked; if the bending radius is too large, it will produce elastic rebound. Due to the fibrous structure formed during the rolling process of the plate, there are differences in the mechanical properties and physical properties i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14B21B3/02B21C37/02C21C7/00C22C33/06
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/06C21C7/0006B21C37/02B21B3/02
Inventor 宋欣张楠俞飞闫文凯徐洪庆乔治明楚志宝李文双韩萍顾凤义王勇
Owner 天津市新天钢钢铁集团有限公司
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