High-hardness wear-resistant steel plate and manufacturing method thereof

A manufacturing method and high-hardness technology, applied in the field of wear-resistant steel pipes, can solve the problems of troublesome concrete ramming, low wear resistance of boom tubes, frequent replacement, etc., and achieve reasonable composition and process design, excellent wear-resistant steel performance, The effect of loose craft system

Active Publication Date: 2013-07-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestically produced jib tubes have low wear resistance and are frequently replaced, causing great trouble for concrete injection on site
The inability of domestic boom pipes to surpass foreign advanced products has become a bottleneck restricting the development of boom pump trucks to high-end and leading the world

Method used

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  • High-hardness wear-resistant steel plate and manufacturing method thereof
  • High-hardness wear-resistant steel plate and manufacturing method thereof
  • High-hardness wear-resistant steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of the wear-resistant steel pipe of the present invention and Comparative Example 1 (see patent CN101602079) is shown in Table 1. After smelting according to the chemical composition shown in Table 1, heat the continuous casting slab or steel ingot to 1250°C, and slowly cool after rolling. After the steel coil is annealed, the tube forming size is ф150mm, the welding power of high-frequency ERW is 280KW, the welding frequency is 290KHZ, and the production line speed is 23m / min.

[0037]The quenching temperature of the welded pipe is 850°C, the holding time is 15min, the tempering temperature is 180°C, the holding time is 25min, air cooling after tempering, the hardness is HRC62.1

[0038] see figure 1 , figure 1 It is the as-rolled structure of the steel plate in Example 1 of the present invention, which is ferrite + pearlite, and the structure uniformity is poor. figure 2 It is the annealed structure of the steel plate of the present invent...

Embodiment 2

[0041] The implementation mode is the same as that in Example 1, wherein the heating temperature of the continuous casting slab or steel ingot is 1200° C., and it is slowly cooled after rolling. After the steel coil is annealed, the tube forming size is ф130mm, the welding power of high-frequency ERW is 250KW, the welding frequency is 290KHZ, and the production line speed is 20m / min.

[0042] The quenching temperature of the welded pipe is 830°C, the holding time is 18min, the tempering temperature is 220°C, the holding time is 20min, air cooling after tempering, the hardness is HRC62.8.

Embodiment 3

[0044] The implementation mode is the same as that in Example 1, wherein the heating temperature of the continuous casting slab or steel ingot is 1140° C., and it is slowly cooled after rolling.

[0045] After the steel coil is annealed, the pipe forming size is ф139.5mm, the welding power of high-frequency ERW is 270KW, the welding frequency is 300KHZ, and the production line speed is 25m / min.

[0046] The quenching temperature of the welded pipe is 830°C, the holding time is 28min, the tempering temperature is 270°C, the holding time is 46min, air cooling after tempering, the hardness is HRC63.6.

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Abstract

The present invention provides a high-hardness wear-resistant steel plate and a manufacturing method thereof. The high-hardness wear-resistant steel plate comprises the following chemical compositions (wt%) of 0.60-0.75% of C, 0.10-0.40% of Si, 0.60-1.30% of Mn, 0-0.020% of P, 0-0.010% of S, 0.10-0.50% of Cu, 0.10-0.50% of Ni, 0.0030-0.0100% of N, and the balance being Fe and inevitable impurities. The manufacturing method comprises the following steps of smelting, casting, hot rolling, annealing, pipe making, welding, quenching and tempering and other steps. The wear-resistant steel plate obtained by the above compositions and through the above process has high hardness and high wear resistance, with typical Rockwell hardness of HRC 62 to 66, and is suitable for easy-to-wear parts in various mechanical equipments, such as concrete pump delivery pipes.

Description

technical field [0001] The invention relates to a wear-resistant steel pipe, in particular to a high-hardness wear-resistant steel pipe and a manufacturing method thereof, the typical Rockwell hardness of which is HRC62-66. Background technique [0002] At present, with the rapid development of domestic construction machinery, the demand for materials is increasing, and the requirements for material quality are also getting higher and higher. The domestic demand for wear-resistant pipes for conveying pipelines in concrete pump trucks reaches hundreds of thousands of tons, which is the main application way for high-hardness and high-strength wear-resistant pipes. [0003] my country's boom-type concrete pump truck has developed rapidly in recent years, but there is still a certain gap between the refined design of the product, the control ability of manufacturing quality, the stability of the product and the technology of the foreign advanced enterprises. There are irregular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21D9/08
Inventor 华蔚李红斌杨晓臻张涛徐鼎华姚连登
Owner BAOSHAN IRON & STEEL CO LTD
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