Title of Invention	“HIGH TOUGHNESS ABRASION RESISTANT STEEL WITH LITTLE CHANGE IN HARDNESS DURING USE AND METHOD OF PRODUCTION OF SAME”
Abstract	The invention provides a wear-resistant steel which has a hardness of HB400 to HB520 and exhibits little hardness change in long-term service and which is excellent in toughness, namely, a steel which contains by mass C: 0.21 to 0.30%, Si: 0.30 to 1.00%, Mn: 0.32 to 0.70%, P: 0.02% or below, S: 0.01% or below, Cr: 0.1 to 2.0%, Mo: 0.1 to 1.0%, B: 0.0003 to 0.0030%, Al: 0.01 to 0.1%, and N: 0.01% or below, and further contains one or more of V: 0.01 to 0.1%, Nb: 0.005 to 0.05%, Ti: 0.005 to 0.03%, Ca: 0.0005 to 0.05%, Mg: 0.0005 to 0.05%, and REM: 0.001 to 0.1%, with the balance being Fe, characterized by having an M value of -10 to 16 as defined by the following formula (1): M = 26 × [Si] - 40 × [Mn] - 3 × [Cr] + 36 ...

Title of Invention

“HIGH TOUGHNESS ABRASION RESISTANT STEEL WITH LITTLE CHANGE IN HARDNESS DURING USE AND METHOD OF PRODUCTION OF SAME”

Abstract

The invention provides a wear-resistant steel which has a hardness of HB400 to HB520 and exhibits little hardness change in long-term service and which is excellent in toughness, namely, a steel which contains by mass C: 0.21 to 0.30%, Si: 0.30 to 1.00%, Mn: 0.32 to 0.70%, P: 0.02% or below, S: 0.01% or below, Cr: 0.1 to 2.0%, Mo: 0.1 to 1.0%, B: 0.0003 to 0.0030%, Al: 0.01 to 0.1%, and N: 0.01% or below, and further contains one or more of V: 0.01 to 0.1%, Nb: 0.005 to 0.05%, Ti: 0.005 to 0.03%, Ca: 0.0005 to 0.05%, Mg: 0.0005 to 0.05%, and REM: 0.001 to 0.1%, with the balance being Fe, characterized by having an M value of -10 to 16 as defined by the following formula (1): M = 26 × [Si] - 40 × [Mn] - 3 × [Cr] + 36 ...

Full Text	The present invention relates to an abrasion resistant steel having the hardness of HB400 to HB520 required in construction machinery, .............

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=H5QzEQ+pi7YYMpdQPhWH9g==&loc=+mN2fYxnTC4l0fUd8W4CAA==

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Patent Number

271702

Indian Patent Application Number

1973/DELNP/2008

PG Journal Number

10/2016

Publication Date

04-Mar-2016

Grant Date

29-Feb-2016

Date of Filing

07-Mar-2008

Name of Patentee

NIPPON STEEL & SUMITOMO METAL CORPORATION

Applicant Address

6-1, MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 100-8071, JAPAN

Inventors:

#	Inventor's Name	Inventor's Address
1	Naoki SAITOH	C/o NIPPON STEEL CORPORATION NAGOYA WORKS 5-3 Tokaimachi Tokai-shi Aichi 4768686 (Japan)
2	Tatsuya KUMAGAI	C/o NIPPON STEEL CORPORATION NAGOYA WORKS 5-3 Tokaimachi Tokai-shi Aichi 4768686 (Japan)
3	Katsumi KUREBAYASHI	C/o NIPPON STEEL CORPORATION 6-3 Otemachi 2-chome Chiyoda-ku Tokyo 1008071 (Japan)
4	Hirohide MURAOKA	C/o NIPPON STEEL CORPORATION NAGOYA WORKS 5-3 Tokaimachi Tokai-shi Aichi 4768686 (Japan)

PCT International Classification Number

C22C 38/00

PCT International Application Number

PCT/JP2006/316657

PCT International Filing date

2006-08-18

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	2005-262297	2005-09-09	Japan