Patents by Inventor Byoung Chul HWANG

Byoung Chul HWANG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High-performance high-nitrogen duplex stainless steels excellent in pitting corrosion resistance
    Patent number: 9663850
    Abstract: The present invention relates to high-nitrogen duplex stainless steels with an excellent eco-index and pitting corrosion resistance, in particular, to providing duplex stainless steels with ferrite-austenite phases, including: 16.5-19.5 wt. % of chromium (Cr), 2.3-3.5 wt. % of molybdenum (Mo), 1.0-5.5 wt. % of tungsten (W), 5.5-7.0 wt. % of manganese (Mn), 0.35-0.45 wt. % of nitrogen (N), with a remainder of iron (Fe). The high nitrogen duplex stainless steels with excellent eco-index and pitting corrosion resistance according to the present invention use manganese (Mn) and nitrogen (N) to exclude or mostly substitute Ni, which increases price instability of the steel grades and environment burden, to result in enhancing economic efficiency, price stability and eco-friendliness.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: May 30, 2017
    Assignee: Korea Institute of Machinery and Materials
    Inventors: Heon Young Ha, Tae-Ho Lee, Byoung Chul Hwang
  • HIGH-PERFORMANCE HIGH-NITROGEN DUPLEX STAINLESS STEELS EXCELLENT IN PITTING CORROSION RESISTANCE
    Publication number: 20140219857
    Abstract: The present invention relates to high-nitrogen duplex stainless steels with an excellent eco-index and pitting corrosion resistance, in particular, to providing duplex stainless steels with ferrite-austenite phases, including: 16.5-19.5 wt. % of chromium (Cr), 2.3-3.5 wt. % of molybdenum (Mo), 1.0-5.5 wt. % of tungsten (W), 5.5-7.0 wt. % of manganese (Mn), 0.35-0.45 wt. % of nitrogen (N), with a remainder of iron (Fe). The high nitrogen duplex stainless steels with excellent eco-index and pitting corrosion resistance according to the present invention use manganese (Mn) and nitrogen (N) to exclude or mostly substitute Ni, which increases price instability of the steel grades and environment burden, to result in enhancing economic efficiency, price stability and eco-friendliness.
    Type: Application
    Filed: April 11, 2014
    Publication date: August 7, 2014
    Applicant: KOREA INSTITUTE OF MACHINERY AND MATERIALS
    Inventors: Heon Young HA, Tae-Ho LEE, Byoung Chul HWANG