Title:
LOW-SILICON NB-V COMPOSITE MICROALLOYED GEAR STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/046198
Kind Code:
A1
Abstract:
A low-silicon Nb-V composite microalloyed gear steel and a manufacturing method therefor, which belong to the technical field of gear steels. A gear steel comprises the following chemical components in percentages by weight: C: 0.22-0.26%, Si: ≤0.10%, Mn: 0.30-0.50%, Cr: 0.70-0.90%, Mo: 0.30-0.50%, Ni: 0.30-0.50%, Al: 0.030-0.050%, Nb: 0.030-0.060%, V: 0.10-0.50%; P: ≤0.010%, S: ≤0.015%, T.O: ≤10 ppm, and [N]: 60-120 ppm, with the balance being Fe and inevitable impurities. The depth of a surface oxidation layer during a gear carburizing process is effectively reduced by means of element matching and process optimization, and the obtained gear steel has a tensile strength of 1050-1200 MPa, a yield strength of 840-950 MPa, a percentage elongation after fracture of ≥30%, the percentage reduction of area of ≥40%, a room-temperature impact energy (U2) of ≥85 J, an oxidation layer depth after carburizing of ≤35 μm, and a rotating bending fatigue strength of ≥680 MPa.
Inventors:
HU FANGZHONG (CN)
WANG KAIZHONG (CN)
JIN GUOZHONG (CN)
YANG ZHIQIANG (CN)
CHEN SHIJIE (CN)
YANG SHAOPENG (CN)
WU SHENGFU (CN)
JING HONGLIANG (CN)
WANG KAIZHONG (CN)
JIN GUOZHONG (CN)
YANG ZHIQIANG (CN)
CHEN SHIJIE (CN)
YANG SHAOPENG (CN)
WU SHENGFU (CN)
JING HONGLIANG (CN)
Application Number:
PCT/CN2023/114649
Publication Date:
March 07, 2024
Filing Date:
August 24, 2023
Export Citation:
Assignee:
MAANSHAN IRON & STEEL CO LTD (CN)
International Classes:
C22C38/48; C21D1/18; C22C38/02; C22C38/04; C22C38/06; C22C38/44; C22C38/46; C22C33/06; C23C8/00
Foreign References:
| CN115522121A | 2022-12-27 | |||
| JPH0673492A | 1994-03-15 | |||
| CN113430461A | 2021-09-24 | |||
| CN101184860A | 2008-05-21 | |||
| JP2001303173A | 2001-10-31 | |||
| JPH0559432A | 1993-03-09 | |||
| CN113025867A | 2021-06-25 |
Other References:
ZHENDONG ZHAO: " Effect of Alloying Elements on Oxidation Formation in Carburized Steel", HEAT TREAMENT OF METALS ABROAD, vol. 4, 15 August 1998 (1998-08-15), pages 34 - 37, XP093144963
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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