Supercharge Your Innovation With Domain-Expert AI Agents!

Steel material for induction hardening

A high-frequency quenching and steel technology, applied in the field of power transmission parts and high-frequency quenched steel, can solve the problems of unclear, no case-hardening steel machinability comparative research, etc., and achieve excellent surface hardness and excellent machinability. Effect

Inactive Publication Date: 2016-10-12
NIPPON STEEL CORP
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that in order to obtain the required surface hardness by induction hardening, it is necessary to increase the C content of the steel (steel for induction hardening) to be subjected to induction hardening.
However, in Patent Document 3, there is no comparative study on the machinability of the invention steel and the machinability of the case hardened steel.
Therefore, it is unclear whether the technique disclosed in Patent Document 3 can obtain good machinability as good as that of case-hardened steel.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Steel material for induction hardening
  • Steel material for induction hardening
  • Steel material for induction hardening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] Next, examples of the present invention will be described. The production conditions in the examples are examples of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. The present invention can employ various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0134] Steels having the chemical compositions shown in Table 2-1 and Table 2-2 were melted. When casting steels 1 to 28, the cooling rate from the liquidus temperature to the solidus temperature in the 1 / 4 part in the thickness direction of the slab is controlled at 10 to 100°C / min. , set the cooling rate below 10°C / min. The cooling rate at the time of casting of each steel described in Table 2-1 and Table 2-2 was estimated based on the average pitch of secondary dendrite arms before hot working of each steel. After casting...

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
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

According to one embodiment of the present invention, the chemical composition of a steel material for induction hardening includes a prescribed amount of alloying elements, the remainder comprises Fe and impurities, Al*N is 0.000330-0.000825, and Mn / S is 4.6-14.0. The machinability index (M) is 15.5-25.65. At a 1 / 4 diameter location, the area ratio of AlN for an equivalent circle diameter exceeding 200 nm is 20% or less of the area ratio of all AlN for an equivalent circle diameter of 40 nm or more. At the 1 / 4 diameter location, the number density of Mn sulphide inclusions of a maximum diameter of 0.3-10 micrometers inclusive is 100-2500 per mm2 inclusive.

Description

technical field [0001] The present invention relates to steel materials for induction hardening with excellent machinability, and in particular to power transmission parts (such as gears, bearings, CVT pulleys, and Shafts, etc.) can suitably apply induction hardened steel. [0002] this application claims priority based on Japanese Patent Application No. 2014-033352 for which it applied to Japan on February 24, 2014, The content is used here. Background technique [0003] In the past, power transmission parts such as gears were often used after surface hardening treatment. As the surface hardening method, carburizing, nitriding, induction hardening and the like are used. Here, "carburization" is a method aimed at hardening only the surface layer of the material while maintaining the toughness of the central portion of the material. Carburizing is mainly used for the purpose of improving fatigue strength, and is applied to materials such as gears and CVT and CVJ parts for ...

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(China)
IPC IPC(8): C22C38/00C22C38/60
CPCB22D11/16B22D11/22C21D1/10C21D1/42C21D6/002C21D6/005C21D6/008C21D8/02C21D8/0247C21D9/30C21D9/32C21D9/40C21D2211/004C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/40C22C38/42C22C38/60Y02P10/25C22C38/12C22C38/16Y02P10/20
Inventor 间曾利治吉田卓宫西庆
Owner NIPPON STEEL CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com