公开(公告)号：US20240175111A1

公开(公告)日：2024-05-30

申请号：US18179362

申请日：2023-03-07

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Chaofang DONG ,  Li WANG ,  Decheng KONG ,  Shiyuan ZHANG ,  Yucheng JI ,  Xiaogang LI

IPC: C22C33/02 ,  B22F10/28 ,  B22F10/64 ,  B33Y10/00 ,  B33Y40/20 ,  B33Y70/00 ,  B33Y80/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48

CPC classification number: C22C33/0207 ,  B22F10/28 ,  B22F10/64 ,  B33Y10/00 ,  B33Y40/20 ,  B33Y70/00 ,  B33Y80/00 ,  C22C33/0285 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/48 ,  B22F2201/02 ,  B22F2301/35 ,  B22F2998/10 ,  B22F2999/00

Abstract: An additively manufactured high-strength and high-ductility stainless steel is characterized in that the composition, by weight percentage, C≤0.05 wt %, Si≤1 wt %, Mn≤1 wt %, Cr 14.5-15.5 wt %, Ni 5.0-5.5 wt %, Cu 4-4.5 wt %, Nb 0.35-0.45 wt %, and the balance of Fe and unavoidable impurities. And Cr equivalent of Creq=% Cr+% Mo+2.2% Ti+0.7% Nb+2.48% Al. Ni equivalent of Nieq=% Ni+35% C+20% N+0.25% Cu. The yield strength of the high-strength and high-ductility stainless steel ≥1270 MPa, the tensile strength ≥1380 MPa, and the elongation after fracture ≥15%.

公开(公告)号：US20170058391A1

公开(公告)日：2017-03-02

申请号：US15070287

申请日：2016-03-15

Applicant: University of Science and Technology Beijing

Inventor： Xiaogang LI ,  Xuequn CHENG ,  Chaofang DONG ,  Cuiwei DU ,  Dawei ZHANG

IPC: C23C10/40 ,  C22C38/02 ,  C22C38/20 ,  C22C38/04 ,  C22C38/28 ,  C22C38/22

CPC classification number: C23C10/40 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/28 ,  C23C10/60

Abstract: This present invention provides a method for preparing a stainless reinforcing steel bar resistant to corrosion of chloride ions, and belongs to the technical field of corrosion-resistant materials. This method particularly comprises the steps of: selecting a reinforcing steel bar blank, and performing oil removing, rust removing, water washing, and drying treatments on the surface of the reinforcing steel bar blank to be treated, or directly performing sand blasting or shot blasting on a reinforcing steel bar blank whose surface is only slightly rusted; placing the reinforcing steel bar blank in a chromium-containing environment, and keeping at a certain temperature for a certain time such that chromium in the environment is capable of diffusing into the surface of the reinforcing steel bar blank to form a chromium-containing diffusion layer, wherein an area in the diffusion layer where the weight content of Cr exceeds 12% meets the basic component requirements for a stainless steel, and this area is the effective diffusion layer described in this invention; and performing cooling treatment on the heat diffusion treated reinforcing steel bar. In this invention, a reinforcing steel bar blank is pre-formed, a heat diffusion technique is optimized, and the corrosion resistance to chloride ions of the stainless reinforcing steel bar of this invention is superior to that of the 316L stainless reinforcing steel bar.

Abstract translation: 本发明提供一种耐氯离子腐蚀的不锈钢钢筋的制备方法，属于耐腐蚀材料的技术领域。 该方法特别包括以下步骤：选择加强钢筋坯料，并在待处理的钢筋坯料的表面进行除油除锈，水洗和干燥处理，或直接进行喷砂或喷丸处理 在表面仅生锈的钢筋坯料上; 将加强钢筋坯料放置在含铬环境中，并在一定温度下保持一定时间，使得环境中的铬能够扩散到钢筋坯料的表面，形成含铬扩散层 其中，Cr的重量含量超过12％的扩散层的面积满足不锈钢的基本成分要求，该面积是本发明中描述的有效扩散层; 对热扩散处理的钢筋进行冷却处理。 在本发明中，预先形成钢筋坯料，优化热扩散技术，本发明的不锈钢钢筋对氯离子的耐腐蚀性优于316L不锈钢钢筋。