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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11186901 B1

PDFFull Text
Date of Patent:
Nov. 30, 2021

Filed:

Mar. 09, 2016

Chisel and steel for chisel

Applicant:

Komatsu Ltd., Tokyo, JP;

Inventors:

Eiji Amada, Kyotanabe, JP;

Akihiro Ochiai, Hirakata, JP;

Norimasa Tsunekage, Himeji, JP;

Yuko Nagaki, Himeji, JP;

Assignee:

KOMATSU LTD., Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/00 (2006.01); C22C 38/22 (2006.01); B25D 17/02 (2006.01); E21C 37/26 (2006.01); E21B 10/52 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01);
U.S. Cl.
CPC ...
C22C 38/22 (2013.01); B25D 17/02 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); E21B 10/52 (2013.01); E21C 37/26 (2013.01); B25D 2222/42 (2013.01);
Abstract

A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more:DI=7·(% C)·(1+0.64·% Si)·(1+4.1·% Mn)·(1+2.83·% P)·(1−0.62·% S)·(1+2.33·% Cr)·(1+3.14·% Mo)  (1).

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