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.:
Date of Patent:
May. 06, 2014
Filed:
Aug. 04, 2010
You-hwan Lee, Pohang, KR;
Dong-hyun Kim, Pohang, KR;
Sang-yoon Lee, Pohang, KR;
Ha-ni Kim, Pohang, KR;
Yong-sik Park, Pohang, KR;
You-Hwan Lee, Pohang, KR;
Dong-Hyun Kim, Pohang, KR;
Sang-Yoon Lee, Pohang, KR;
Ha-Ni Kim, Pohang, KR;
Yong-Sik Park, Pohang, KR;
POSCO, , KR;
Abstract
There is provided a rolled steel with excellent toughness, a drawn wire rod prepared by drawing the rolled steel, and a method for manufacturing the same, in which even if a heating step is omitted, the toughness of the steel can be improved by securing a degenerated pearlite structure in an internal structure of the rolled steel by controlling a content of Mn among components and cooling conditions, and then preventing C diffusion. The rolled steel according to the present invention includes C: 0.15˜0.30%, Si: 0.1˜0.2%, Mn: 1.8˜3.0%, P: 0.035% or less, S: 0.040% or less, the remainder Fe, and other inevitable impurites, as a percentage of weight, in which the microstucture of the rolled steel is composed of ferrite and pearlite including cementite with 150 nm or less of thickness.