Title:
PRODUCTION METHOD FOR HIGH-STRENGTH STEEL PLATE FOR ENGINEERING MACHINERY
Document Type and Number:
WIPO Patent Application WO/2023/029282
Kind Code:
A1
Abstract:
A production method for a high-strength steel plate for engineering machinery. The components of the steel and the weight percentages thereof are as follows: C＝0.10％-0.25％, Si ≤ 0.80％, Mn＝0.80％-1.20％, P ≤ 0.010％, S ≤ 0.0015％, Al＝0.005％-0.015％, Cr ≤ 1.0％, Mo ≤ 1.0％, Ni＝0.30％-2.0％, Cu ≤ 0.30％, Ti ≤ 0.015％, Nb ≤ 0.020％, V ≤ 0.080％, B ≤ 0.0040％, N ≤ 0.0040％, O ≤ 0.0010％, and H ≤ 0.00015％, with the balance being Fe at ≥95％ and inevitable impurities. The process steps for the steel plate comprise: smelting, refining, continuous casting, rolling, and heat treating. The structure of the steel plate comprises a lath martensite matrix and a small amount of residual austenite, wherein 5％-10％ of the residual austenite is on the upper surface of the steel plate, and 2％-5％ of the residual austenite is on the lower surface of the steel plate. The steel plate of the present invention has good comprehensive mechanical properties and pure steel quality, has homogeneous properties in the transverse and longitudinal structures and a rolling direction, has a good plate shape and good surface quality, and has low residual stress and exhibits excellent whole plate bending capacity in the rolling direction. The steel plate may be used in the manufacturing of large engineering machinery such as cranes and pump trucks.
Inventors:
PENG NINGQI (CN)
YANG JIANHUA (CN)
ZHOU WENHAO (CN)
LI HONGYING (CN)
NI CHUANHAO (CN)
LUO DENG (CN)
LIU DAN (CN)
ZHANG YONGWEI (CN)
LIU HAILANG (CN)
YAO JIANHUA (CN)
ZHAO JUN (CN)
QIAN YAJUN (CN)
ZHANG QINGXUE (CN)
YANG JIANHUA (CN)
ZHOU WENHAO (CN)
LI HONGYING (CN)
NI CHUANHAO (CN)
LUO DENG (CN)
LIU DAN (CN)
ZHANG YONGWEI (CN)
LIU HAILANG (CN)
YAO JIANHUA (CN)
ZHAO JUN (CN)
QIAN YAJUN (CN)
ZHANG QINGXUE (CN)
Application Number:
PCT/CN2021/136991
Publication Date:
March 09, 2023
Filing Date:
December 10, 2021
Export Citation:
Assignee:
XIANGTAN IRON&STEEL CO LTD OF HUNAN VALIN (CN)
UNIV CENTRAL SOUTH (CN)
ZOOMLION HEAVY IND SCI & TECH (CN)
UNIV CENTRAL SOUTH (CN)
ZOOMLION HEAVY IND SCI & TECH (CN)
International Classes:
C21D8/02; C22C38/12; C22C38/14; C22C38/40; C22C38/44; C22C38/46; C22C38/48; C22C38/54
Foreign References:
| CN106498296A | 2017-03-15 | |||
| GB601588A | 1948-05-10 | |||
| US20140050941A1 | 2014-02-20 | |||
| JPS5716133A | 1982-01-27 | |||
| CN102876972A | 2013-01-16 | |||
| CN106191673A | 2016-12-07 | |||
| CN102925799A | 2013-02-13 | |||
| CN111254361A | 2020-06-09 |
Attorney, Agent or Firm:
CHANGSHA XINGYAO PATENT OFFICE (GENERAL PARTNERSHIP) (CN)
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