Title:
HIGH-STRENGTH HULL STEEL WITH EXCELLENT LOW-TEMPERATURE TOUGHNESS AND ONE-STEEL MULTI-GRADE HEAT TREATMENT TECHNOLOGY THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/080492
Kind Code:
A1
Abstract:
A high-strength hull steel with excellent low-temperature toughness and a one-steel multi-grade heat treatment technology therefor. The chemical components of the hull steel in percentage by mass are: 0.12-0.15% of C, 0.20-0.30% of Si, 1.40-1.70% of Mn, 0.12-0.15% of Ni, 0.16-0.25% of Cr, 0.08-0.12% of Mo, 0.020-0.030% of Nb, 0.012-0.018% of Ti, less than or equal to 0.02% of V, less than or equal to 0.015% of P, less than or equal to 0.002% of S, 0.0020-0.0030% of B, and the balance of Fe and unavoidable impurities. Through different combinations of quenching and tempering technologies, a high-strength hull steel plate with excellent low-temperature toughness can be produced, and the hull steel plate has the maximum thickness of 50 mm and can meet the requirement of E460-E550 strength grades. The alloy cost is low, and the technological adaptability is wide.
Inventors:
XIE ZHANGLONG (CN)
WANG PANFENG (CN)
JIN XING (CN)
ZHANG BINGJUN (CN)
HU QILONG (CN)
WANG PANFENG (CN)
JIN XING (CN)
ZHANG BINGJUN (CN)
HU QILONG (CN)
Application Number:
PCT/CN2018/088338
Publication Date:
May 02, 2019
Filing Date:
May 25, 2018
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/38; C21D1/18
Foreign References:
| CN107805758A | 2018-03-16 | |||
| CN104662193A | 2015-05-27 | |||
| CN107109589A | 2017-08-29 | |||
| JP2012036475A | 2012-02-23 | |||
| CA2564050C | 2014-08-19 |
Attorney, Agent or Firm:
NANJING LI & FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL CENERAL PARTNERSHIP) (CN)
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