700 MPA GRADE HOT-FORMED AXLE HOUSING STEEL AND PREPARATION METHOD THEREFOR

Title:

700 MPA GRADE HOT-FORMED AXLE HOUSING STEEL AND PREPARATION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2022/063244

Kind Code:

A1

Abstract:

The present disclosure discloses a 700 MPa grade hot-formed axle housing steel, the mass fractions of chemical components of which are: C: 0.17% to 0.27%, Si: 0.30% to 0.50%, Mn: 1.2% to 1.8%, P: ≤0.02% , S: ≤0.009%, Ti: ≤0.1%, and Cr: ≤0.2%, the balance being Fe and unavoidable impurities, among which the mass fractions of Si and Mn satisfy 0.23 ≤ Si/Mn ≤ 0.27. The present disclosure further discloses a preparation method therefor, comprising: using the above chemical components to carry out smelting, continuous casting, heating, roughing and finishing, and coiling and processing, during which the heating temperature is 1180°C to 1220°C, and the heating time is 150 min to 200 min, to obtain the 700 MPa grade hot-formed axle housing steel. The steel has excellent mechanical properties before and after heat treatment, and the plate has no obvious micro-banded structures after the heat treatment and has excellent impact toughness.

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Inventors:

HUI YAJUN (CN)
LIU KUN (CN)
ZHU GUOSEN (CN)
WU KEMIN (CN)
LI QIUHAN (CN)
HAN YUN (CN)
NIU TAO (CN)
TIAN ZHIHONG (CN)
CHEN BIN (CN)
XIAO BAOLIANG (CN)
LI FEI (CN)
WANG SONGTAO (CN)
ZHOU NA (CN)
WANG QUANLI (CN)
LI XIAOLIN (CN)
HUANG TIANHUA (CN)
PAN HUI (CN)
ZHANG DAWEI (CN)

Application Number:

PCT/CN2021/120417

Publication Date:

March 31, 2022

Filing Date:

September 24, 2021

Export Citation:

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Assignee:

SHOUGANG GROUP CO LTD (CN)
BEIJING SHOUGANG CO LTD (CN)

International Classes:

C22C38/02; B21C37/02; C22C33/04; C22C38/04; C22C38/22; C22C38/26; C22C38/28; C22C38/32

Foreign References:

CN103882322A	2014-06-25
CN103938092A	2014-07-23
CN103014494A	2013-04-03
CN110106444A	2019-08-09
CN108085585A	2018-05-29
KR20200063372A	2020-06-05
JP2009280870A	2009-12-03

Attorney, Agent or Firm:

BEIJING BRIGHT & RIGHT LAW FIRM (CN)

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