公开(公告)号：US11427878B2

公开(公告)日：2022-08-30

申请号：US16897950

申请日：2020-06-10

Applicant: Northeastern University

Inventor： Xiangtao Deng ,  Zhaodong Wang ,  Hao Wu ,  Tianliang Fu ,  Yong Tian ,  Jiadong Li

IPC: C22C38/04 ,  C21D8/02 ,  C21D1/02 ,  C21D1/18 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/32

Abstract: An ultrahigh-strength ultrahigh-toughness and low-density dual-phase lamellar steel plate is disclosed. The steel plate comprises the following alloy components in percentage by mass: 0.200-0.320% of C, 0.600-2.000% of Mn, 0.200-0.600% of Si, 2.000-4.000% of Al, 0.300-1.200% of Ni, 0.001-0.005% of B, P not greater than 0.012%, S not greater than 0.005%, and the balance of Fe and inevitable impurities. The steel plate consists of dual phases of ferrites and martensites, the ferrites are high-temperature delta ferrites, the martensites are lath martensites, the delta ferrites are distributed in the lath martensites in a lamellar mode. The steel plate has excellent mechanical properties, for example, the yield strength in the rolling direction is not less than 1000 MPa, the tensile strength is not less than 1600 MPa, the elongation is not less than 8.0%, and the average value of Charpy V-Notch impact energy at −40° C. is not less than 350J.

公开(公告)号：US20170056944A1

公开(公告)日：2017-03-02

申请号：US14838818

申请日：2015-08-28

Applicant: NORTHEASTERN UNIVERSITY

Inventor： Zhaodong Wang ,  Bingxing Wang ,  Junyu Wu ,  Tian Zhang ,  Yong Tian ,  Yi Han ,  Tianliang Fu ,  Yong Li ,  Guodong Wang

IPC: B21B37/76 ,  B21B38/00 ,  B21B45/02

CPC classification number: B21B45/0218 ,  B21B37/74 ,  B21B38/006 ,  B21B2261/20

Abstract: The present invention relates to controlled cooling in manufacture of steel plate, and in particular, to an on-line cooling system for controlled rolling with an inter-pass cooling process, which comprises a rolling mill and on-line cooling equipment. The cooling equipment is accessorily arranged on the exit of the rolling mill, so that the rolling mill and the cooling equipment are combined. One rolling mill and one set of on-line cooling equipment are considered a cooling group, and several such groups are connected in series, so the steel plate can be cooled in any rolling pass. In this invention, both the cooling system and the water supply system are arranged on the main frame, and the rolling process and the cooling process are synchronized by using inter-pass cooling. Consequently, satisfied rolling effect in the condition of a temperature gradient along the thickness direction, grain refinement at the surface and drastic strength improvement without sacrificing toughness are achieved. Besides, better quality of the plate center region is obtained, double bulging is avoided and the yield of steel plate is improved due to the higher deformation permeability.

Abstract translation: 本发明涉及钢板制造中的受控冷却，特别涉及一种包括轧机和在线冷却装置的通过冷却过程的用于控制轧制的在线冷却系统。 冷却设备配置在轧机的出口处，使轧机和冷却设备组合。 一台轧机和一套在线冷却设备被认为是一个冷却组，并且几个这样的组被串联连接，因此钢板可以在任何轧制过程中被冷却。 在本发明中，冷却系统和供水系统均布置在主框架上，并且通过使用冷却流程来同步轧制过程和冷却过程。 因此，在沿着厚度方向的温度梯度的条件下，在表面上的晶粒细化和强度提高而不牺牲韧性的情况下实现满意的滚动效果。 此外，获得了更好的板中心区域的质量，避免了双重凸起，并且由于较高的变形渗透性而提高了钢板的产量。

公开(公告)号：US10065226B2

公开(公告)日：2018-09-04

申请号：US14838818

申请日：2015-08-28

Applicant: NORTHEASTERN UNIVERSITY

Inventor： Zhaodong Wang ,  Bingxing Wang ,  Junyu Wu ,  Tian Zhang ,  Yong Tian ,  Yi Han ,  Tianliang Fu ,  Yong Li ,  Guodong Wang

IPC: B21B37/74 ,  B21B45/02 ,  B21B38/00

Abstract: The present invention relates to controlled cooling in manufacture of steel plate, and in particular, to an on-line cooling system for controlled rolling with an inter-pass cooling process, which comprises a rolling mill and on-line cooling equipment. The cooling equipment is accessorily arranged on the exit of the rolling mill, so that the rolling mill and the cooling equipment are combined. One rolling mill and one set of on-line cooling equipment are considered a cooling group, and several such groups are connected in series, so the steel plate can be cooled in any rolling pass. In this invention, both the cooling system and the water supply system are arranged on the main frame, and the rolling process and the cooling process are synchronized by using inter-pass cooling. Consequently, satisfied rolling effect in the condition of a temperature gradient along the thickness direction, grain refinement at the surface and drastic strength improvement without sacrificing toughness are achieved. Besides, better quality of the plate center region is obtained, double bulging is avoided and the yield of steel plate is improved due to the higher deformation permeability.

公开(公告)号：US11441214B2

公开(公告)日：2022-09-13

申请号：US17130785

申请日：2020-12-22

Applicant: NORTHEASTERN UNIVERSITY

Inventor： Qibin Ye ,  Liye Kan ,  Cheng Zhou ,  Qinghai Wang ,  Yimin Wang ,  Yong Tian ,  Zhaodong Wang

IPC: C22C38/46 ,  C22C38/42 ,  C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C21D8/02 ,  C21D8/00 ,  C21D9/46

Abstract: The present invention discloses a low-yield-ratio ultra-high-strength high-toughness steel for pressure hulls and a preparation method therefor, wherein the chemical components by weight percentage are: 0.05%-0.10% of C, 0.15%-0.35% of Si, 0.60%-1.00% of Mn, 0.10%-0.50% of Cu, 0.10%-1.00% of Mo, 0.40%-0.70% of Cr, 0.05%-0.15% of V, 5.00%-10.00% of Ni, and the balance of Fe and unavoidable impurities. The technical solution of the present invention adopts secondary quenching heat treatment, the first quenching is performed to achieve complete austenitizing, and then the second quenching and tempering are performed to finally obtain complex phase structures such as tempered martensite, critical ferrite and retained austenite, so as to meet the performance index requirements of low yield ratio, ultra-high strength and high toughness, and thereby promoting application in practice.