Patents by Inventor Dajiang YU

Dajiang YU 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).

  • Free machining and non-quenched and tempered steel and manufacturing method therefor
    Patent number: 11396682
    Abstract: A free-cutting and non-quenched and tempered steel, comprising the following chemical elements by mass percentages: C: 0.35-0.45%, Si: 0.45-0.0.65%, Mn: 1.35-1.65%, S: 0.025-0.065%, V: 0.07-0.15%, Ti: 0.01-0.018%, N: 0.012-0.017%, Al: 0.015-0.035%, Ca: 0.0008-0.0025%, with the remaining being iron and other unavoidable impurities, wherein the S and Ca elements satisfy the relationship S/Ca=20-60. A manufacturing method of the free-cutting and non-quenched and tempered steel, comprising the following steps: (1) smelting and refining; (2) casting; (3) rolling; (4) forging; and (5) two-stage cooling.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: July 26, 2022
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Dajiang Yu, Xijun Jiang, Zongze Huang, Rui Huang
  • FREE MACHINING AND NON-QUENCHED AND TEMPERED STEEL AND MANUFACTURING METHOD THEREFOR
    Publication number: 20200095650
    Abstract: A free-cutting and non-quenched and tempered steel, comprising the following chemical elements by mass percentages: C: 0.35-0.45%, Si: 0.45-0.0.65%, Mn: 1.35-1.65%, S: 0.025-0.065%, V: 0.07-0.15%, Ti: 0.01-0.018%, N: 0.012-0.017%, Al: 0.015-0.035%, Ca: 0.0008-0.0025%, with the remaining being iron and other unavoidable impurities, wherein the S and Ca elements satisfy the relationship S/Ca=20-60. A manufacturing method of the free-cutting and non-quenched and tempered steel, comprising the following steps: (1) smelting and refining; (2) casting; (3) rolling; (4) forging; and (5) two-stage cooling.
    Type: Application
    Filed: June 11, 2018
    Publication date: March 26, 2020
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Dajiang YU, Xijun JIANG, Zongze HUANG, Rui HUANG