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Rare earth NM360 wide and thick steel plate and production method thereof

A production method and technology for steel plates, applied in the field of metallurgical plates, can solve the problems of long process flow, high cost and easy cracking during processing

Inactive Publication Date: 2019-11-29
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the production process of the wear-resistant steel plate in the prior art is complicated, the process flow is long, and the cost is high, and the obtained wear-resistant steel plate has poor low-temperature impact toughness and wear resistance at the core. Poor, processing is easy to crack and other quality defects

Method used

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  • Rare earth NM360 wide and thick steel plate and production method thereof
  • Rare earth NM360 wide and thick steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Embodiment 1, the preparation of rare earth NM360 wide and thick steel plate

[0092] The preparation of wide and thick steel plates in this embodiment adopts the following steps:

[0093]The raw material molten iron undergoes deep desulfurization of molten iron, blowing at the top and bottom of the converter, argon blowing in the ladle, refining outside the LF furnace, RH vacuum treatment and continuous casting to obtain a 300mm thick slab; the thick slab is heated in a heating furnace, and the heating temperature of the slab is 1190 ℃, heating time 290min, heat preservation 50min and then enter the rolling process; the rolling start temperature of the first stage of rolling is 1187℃, the slab is widened in the longitudinal direction, and the relative reduction ratio of a single pass is controlled at least 20 times. % or more, when the thickness of the rolled piece is 161mm (the thickness of the finished product is 2.3 times), wait for the temperature on the roller tab...

Embodiment 2

[0094] Embodiment 2, preparation of rare earth NM360 wide and thick steel plate

[0095] The preparation of wide and thick steel plates in this embodiment adopts the following steps:

[0096] The implementation of smelting and continuous casting is the same as in Example 1, and a 250mm thick slab is obtained; the thick slab is heated in a heating furnace, the slab heating temperature is 1218°C, the slab heating time is 278min, and the rolling process is entered after 50min of heat preservation; the first The stage rolling temperature is 1200°C, and the slab is widened in the length direction. The relative reduction ratio of a single pass is controlled at 20% or more in at least two passes. When the thickness of the rolled piece is 125mm (2.5 times the thickness of the finished product), the roll Wait until the temperature reaches 890 °C on the road, and then carry out the second stage of finish rolling. The final rolling temperature is 810 °C, and the thickness of the finished...

Embodiment 3

[0097] Embodiment 3, preparation of rare earth NM360 wide and thick steel plate

[0098] The preparation of wide and thick steel plates in this embodiment adopts the following steps:

[0099] The implementation of smelting and continuous casting is the same as in Example 1, and a 250mm thick slab is obtained; the thick slab is heated in a heating furnace, the slab heating temperature is 1197°C, the slab heating time is 239min, and the rolling process is entered after 50min of heat preservation; the first The stage rolling temperature is 1225°C, and the relative reduction rate of a single pass is controlled at least 20% for at least two passes. When the thickness of the rolled piece is 60mm (3 times the thickness of the finished product), the temperature on the roller table is 917°C. Then the second stage of finish rolling is carried out, the final rolling temperature is 790°C, and the thickness of the finished steel plate is 30mm; Slow cooling off the production line; after s...

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Abstract

The invention discloses a rare earth NM360 wide and thick steel plate which includes the following components including, by weight, 0.13%-0.19% of C, 0.008%-0.015% of Ti, 0.015%-0.030% of Als, 0.0006%-0.0016% of B, 0.0010%-0.0025% of Ca and 0.0009%-0.0020% of rare earth Re. The invention also discloses a production method of the rare earth NM360 wide and thick steel plate. By means of the rare earth NM360 wide and thick steel plate and the production method of the rare earth NM360 wide and thick steel plate, the contents of all components and the rare earth Re are optimized, the process methodis optimized, and therefore the wide and thick steel plate has the properties of high strength, high toughness, high plasticity and high wear resistance; and the defects of the quality aspect that cracking is prone to happening during machining are avoided, the market prospects are broad, and the needs of social development are met.

Description

technical field [0001] The invention relates to the technical field of metallurgical plates, in particular to a rare earth NM360 wide and thick steel plate and a production method thereof. Background technique [0002] High-performance wear-resistant steel is mainly used in mining machinery, coal mining machinery, environmental protection machinery, construction machinery and conveying machinery, etc. Strict technical characteristics such as high plasticity, high wear resistance, and large thickness. [0003] The wear-resistant steel disclosed in the prior art includes the patent CN106498295A which discloses "high-strength wear-resistant steel and its manufacturing method". , B:0.0014~0.0018%, Ni:0.008~0.011%, Cr:0.16~0.19%, Cu:0.018~0.032%, Mo:0.002~0.006%, Nb:0.018~0.022%, P≤0.014%, S≤ 0.002%, the rest is Fe and unavoidable impurities. The wear-resistant steel disclosed in this patent belongs to the hot continuous rolling coil, which adopts the quenching + low-temperatu...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C21D8/02C21D1/20C21C7/10C21C7/06C21C7/064
CPCC21C7/06C21C7/064C21C7/10C21D1/20C21D8/0226C21D2211/008C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32Y02P10/20
Inventor 高军屈文胜薛越李浩吴明明孙长玉张军白永强吴鹏飞隋鑫柳婕朱晓丽
Owner BAOTOU IRON & STEEL GRP
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