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NM300XT steel band with great formability and production method thereof

A technology of forming performance and production method, applied in the field of metallurgical rolling, can solve the problems of poor shape of automobile body, loss of automobile refitting enterprises, cracking, etc., and achieve the effect of good forming performance, uniform hardness and improved uniformity

Inactive Publication Date: 2020-02-07
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, NM300XT steel strip raw materials adopt bending forming process and welding process. The main production processes are: bending, welding, painting and other key processes. During these deformation processes, the shape of the car body and cracking often occur. It has brought great losses to the car refitting enterprises

Method used

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  • NM300XT steel band with great formability and production method thereof
  • NM300XT steel band with great formability and production method thereof
  • NM300XT steel band with great formability and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The thickness of the NM300XT steel strip with good formability in this example is 5.0mm, and its chemical composition and mass percentage are C: 0.16%, Si: 0.40%, Mn: 1.25%, P: 0.016%, S: 0.003% , Als: 0.018%, Nb: 0.006%, B: 0.0009%, slab sampling inspection of gas in steel: N: 41ppm, H: 1.7ppm, O: 13ppm; the balance is Fe and unavoidable impurities.

[0030] The production method of the NM300XT steel strip with good formability in this embodiment includes continuous casting, heating, rolling, cooling, and coiling operations, and the specific process steps are as follows:

[0031] (1) Continuous casting process: the pure molten steel obtained by smelting, through the dynamic soft reduction technology, based on factors such as casting speed and temperature, simulates and calculates the actual end position of the liquid core during the solidification process of the fan-shaped billet. The previous 4 sectors adopt continuous soft reduction settings, that is, the reduction o...

Embodiment 2

[0042] The thickness of the NM300XT steel strip with good formability in this example is 2.4mm, and its chemical composition and mass percentage are C: 0.15%, Si: 0.56%, Mn: 1.20%, P: 0.013%, S: 0.003% , Als: 0.020%, Nb: 0.021%, B: 0.0016%, and the balance is Fe and unavoidable impurities.

[0043] The production method of the NM300XT steel strip with good formability in this embodiment includes continuous casting, heating, rolling, cooling, and coiling operations, and the specific process steps are as follows:

[0044](1) Continuous casting process: the pure molten steel obtained by smelting, through the dynamic soft reduction technology, based on factors such as casting speed and temperature, simulates and calculates the actual end position of the liquid core during the solidification process of the fan-shaped billet. The previous 4 sectors adopt continuous soft reduction settings, that is, the reduction of each segment is set to 1.8mm, and the total reduction of dynamic sof...

Embodiment 3

[0055] The thickness of the NM300XT steel strip with good formability in this embodiment is 6mm, and its chemical composition and mass percentage are C: 0.16%, Si: 0.54%, Mn: 1.43%, P: 0.012%, S: 0.0012%, Als: 0.025%, Nb: 0.020%, B: 0.0015%, and the balance is Fe and unavoidable impurities.

[0056] The production method of the NM300XT steel strip with good formability in this embodiment includes continuous casting, heating, rolling, cooling, and coiling operations, and the specific process steps are as follows:

[0057] (1) Continuous casting process: the pure molten steel obtained by smelting, through the dynamic soft reduction technology, based on factors such as casting speed and temperature, simulates and calculates the actual end position of the liquid core during the solidification process of the fan-shaped billet. The previous 4 segments adopt continuous soft reduction settings, that is, the soft reductions of segments 1, 2, 3 and 4 are 1.8 mm, 1.8 mm, 1.7 mm, and 1.8 ...

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Abstract

The invention relates to a NM300XT steel band with great formability. The NM300XT steel band consists of the following chemical components in a percent by mass: 0.14-0.22% of C, 0.40-0.70% of Si, 1.2-1.5% of Mn, smaller than or equal to 0.016% of P, smaller than or equal to 0.006% of S, 0.012-0.050% of Als, 0.006-0.030% of Nb and 0.0009-0.002% of B. The invention further provides a production method of the NM300XT steel band with great formability. A two-stage laminar cooling technology is adopted at a cooling procedure, the first-stage cooling speed is 45-50DEG C / S, the second-stage cooling speed is 30-50DEG C / S, and the coiling temperature is 250-300DEG C. The NM300XT steel band with great formability has stable coiling property and uniform crystal grains, and the deformation evenness ofthe NM300XT steel band is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical rolling, and in particular relates to an NM300XT steel strip with good formability and a production method thereof. Background technique [0002] The car body is the load-bearing part of a large dump truck. The car body carries the weight of all the goods. The hardness and strength of the car body affect the service life and driving safety of the car body. Bending and welding processes are generally used to manufacture car bodies. Therefore, The steel for the car body has high requirements on formability and welding performance, that is, the steel for the car body should have good comprehensive properties, high strength, uniform hardness, good welding performance and cold forming performance. [0003] Usually, NM300XT steel strip raw materials adopt bending forming process and welding process. The main production processes are: bending, welding, painting and other key processes. During these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/32
Inventor 王文录贾改风李斌李红俊李冠楠张志强张继永
Owner HANDAN IRON & STEEL GROUP
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