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Nanocrystalline stainless steel for paper pulp millstone and preparation method thereof

A nanocrystalline and stainless steel technology, applied in the field of papermaking, can solve problems such as low yield strength and poor wear resistance, achieve uniform carbide particle size, improve mechanical properties, fatigue properties, and excellent fatigue properties

Active Publication Date: 2021-12-31
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lower yield strength and poor wear resistance of austenitic stainless steel make it difficult to meet the requirements of more pulp grinding discs

Method used

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  • Nanocrystalline stainless steel for paper pulp millstone and preparation method thereof
  • Nanocrystalline stainless steel for paper pulp millstone and preparation method thereof
  • Nanocrystalline stainless steel for paper pulp millstone and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0084] This embodiment provides a method for preparing nanocrystalline stainless steel used in pulp grinding discs, the preparation method comprising the following steps:

[0085] (1) The billet is prepared according to the formula quantity: the raw material ingot is obtained by smelting in a vacuum induction furnace, and then a billet with a thickness of 45 mm is obtained through blank forging and precision forging;

[0086] (2) The blank obtained in the hot rolling step (1) is heat-preserved at 700°C for 2.5 hours to obtain a hot-rolled material; the starting temperature of the hot rolling is 1220°C, and the finishing temperature is 1080°C; the total deformation of the hot rolling amount is 85%, and the single-pass deformation amount of the hot rolling is 19%;

[0087] (3) cold-rolling the hot-rolled material obtained in step (2), the total deformation of the cold-rolled treatment is 90%, and the deformation per pass is 15%, so as to obtain the cold-rolled material;

[0088...

Embodiment 2

[0093] This embodiment provides a method for preparing nanocrystalline stainless steel used in pulp grinding discs. The process steps of the preparation method are the same as those in Embodiment 1.

[0094] In terms of mass percentage, the nanocrystalline stainless steel described in this embodiment includes: C is 0.08wt%, Ni is 2.4wt%, Cu is 1.1wt%, Cr is 13.8wt%, Mn is 3.5wt%, Co is 2.5wt% , N is 0.18wt%, and the balance is Fe and unavoidable impurities; specifically, P≤50ppm, S≤50ppm, and O is less than or equal to 30ppm.

Embodiment 3

[0096] This embodiment provides a method for preparing nanocrystalline stainless steel used in pulp grinding discs. The process steps of the preparation method are the same as those in Embodiment 1.

[0097] In terms of mass percentage, the nanocrystalline stainless steel described in this embodiment includes: C is 0.1wt%, Ni is 2.7wt%, Cu is 1.1wt%, Cr is 13.4wt%, Mn is 4.5wt%, Co is 1.5wt% , N is 0.16wt%, and the balance is Fe and unavoidable impurities; specifically, P≤50ppm, S≤50ppm, and O is less than or equal to 30ppm.

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Abstract

The invention provides nanocrystalline stainless steel for a paper pulp millstone and a preparation method thereof. The nanocrystalline stainless steel for the paper pulp millstone is added with specific components such as C, Ni, Cu, Cr, Mn, Co and Ni, so that the obtained nanocrystalline stainless steel not only has good yield strength, tensile strength and elongation, but also has excellent fatigue performance. According to the nanocrystalline stainless steel for the paper pulp millstone and the preparation method thereof provided by the invention, through combination of hot rolling treatment, cold rolling treatment and two times of plastic deformation treatment, gradient nanocrystalline distribution is formed on the surface of a sample; and through combination of surface treatment and cold rolling treatment, the mechanical property and the fatigue property of the obtained nanocrystalline stainless steel are improved, and the service life of the paper pulp millstone can be prolonged when the nanocrystalline stainless steel is applied to the paper pulp millstone.

Description

technical field [0001] The invention belongs to the technical field of papermaking and relates to a pulp grinding disc, in particular to a nanocrystalline stainless steel used for a pulp grinding disc and a preparation method thereof. Background technique [0002] The refiner in papermaking machinery is an important machine in the papermaking process. The life of the pulp disc in the refiner determines the operating status, production efficiency, corporate profit and product quality of the entire paper production line. Therefore, the pulp disc is required to have wear resistance , acid and alkali corrosion resistance and high toughness and other properties. [0003] Pulp grinding disc is a vulnerable part in papermaking machines, and its service life directly affects pulp quality and production efficiency. The failure of the pulp grinding disc is caused by the composite action of several failure modes such as friction and wear, tooth crack, cavitation, corrosion and edge we...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/42C22C38/52C22C38/58C21D1/26C21D6/00C21D7/06C21D8/02
CPCC22C38/42C22C38/58C22C38/52C22C38/001C22C38/02C21D1/26C21D6/004C21D6/005C21D6/007C21D6/008C21D8/0205C21D8/0221C21D7/06C21D2211/008C21D2211/004
Inventor 赵平汪会秋王泽刚牟相忠狄崇祥
Owner QINGDAO UNIV OF SCI & TECH
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