Unlock instant, AI-driven research and patent intelligence for your innovation.

Wear-resistant steel sheet having excellent toughness and production method

a technology of toughness and production method, applied in the field of wear-resistant steel sheets, can solve the problems of inferior toughness of ferrite-pearlite structure, cladding process is required, and achieve excellent wear resistance, excellent toughness, and improved toughness

Inactive Publication Date: 2020-06-25
NISSHIN STEEL CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention improves the toughness of a non-tempered material that contains Nb-containing steel. This material has excellent wear resistance and toughness, making it ideal for use in cutlery such as rimsaws for mowing fruits and cotton. By improving wear resistance, the lifetime of the cutlery is extended, while maintaining toughness to prevent deterioration.

Problems solved by technology

However, the steel targeted by the literatures has a ferrite-pearlite structure, which is inferior in toughness to the ferrite +spheroidized cementite structure.
However, the cladding process is required.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

examples

[0056]Steels having the chemical compositions shown in Table were melted, and test materials of steel sheets were obtained through the procedure of Casting→Cast piece heating→Hot rolling Intermediate cold rolling→Intermediate annealing→Finish cold rolling→Stress relief annealing.

[0057]In casting, a cast piece was obtained by controlling the cooling rate of the molten steel during cooling from the liquidus line temperature to the solidus line temperature to from 5 to 20° C. / min. The cast piece was heated and retained at from 1,250 to 1,350° C. for 1 hour and then extracted, and was then subjected to hot rolling. The hot rolling condition was a finish rolling temperature (i.e., a rolling temperature of the final pass of the hot rolling) of 850° C. and a coiling temperature of 590° C., and a hot rolled steel sheet having a thickness of 7.0 mm was obtained. For making uniform the thicknesses of the test materials obtained by the experiments with various cold rolling reduction ratios in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

A steel sheet has a composition containing, in mass %, from 0.60 to 1.25% of C, 0.50% or less of Si, from 0.30 to 1.20% of Mn, 0.030% or less of P, 0.030% or less of S, from 0.30 to 1.50% of Cr, from 0.10 to 0.50% of Nb, from 0 to 0.50% of Ti, from 0 to 0.50% of Mo, from 0 to 0.50% of V, from 0 to 2.00% of Ni, the balance being Fe with unavoidable impurities. A ferrite phase as a metal matrix has dispersed therein cementite particles and Ni—Ti based carbide particles. A number density (cross section parallel to rolling and thickness directions) of the carbide particles having a circle equivalent diameter of 0.5 μm or more is from 3,000 to 9,000 per mm2 and a number density of voids having a circle equivalent diameter of 1.0 μm or more is 1,250 per mm2 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a wear-resistant steel sheet having a hard Nb.Ti based carbide dispersed therein, in which the steel sheet is particularly improved in toughness.BACKGROUND ART[0002]An automobile component, a chain component of an industrial machine, a power transmission member, such as a gear, and a cutlery member, such as a rim saw and a band saw, for cutting wood and mowing are demanded to have wear resistance. In general, the wear resistance of a steel material is enhanced by increasing the hardness thereof. Accordingly, a steel material hardened through a heat treatment, such as quenching, and a steel material having a large content of an alloy element, such as carbon, are frequently used as a member with importance of wear resistance. That is, the hardness and the wear resistance of a steel material closely relate to each other, and as a measure for imparting wear resistance to a steel material, a method of increasing the hardness thereof h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/50C21D1/30
CPCC21D8/0236C21D1/30C21D8/0226C22C38/50C22C38/02C22C38/04C21D8/0263C21D8/0268C21D9/46C21D2211/006C22C38/12C22C38/14C21D8/0426C21D8/0436C21D8/0473C22C38/44C22C38/48
Inventor MIYAWAKI, DAIFUJIHARA, MASARU
Owner NISSHIN STEEL CO LTD