High-strength 9% Ni steel for ultra-low temperature engineering fasteners and its preparation method

An engineering fastener, high-strength technology, applied in the field of low-temperature metal materials, can solve problems such as unsatisfactory, and achieve excellent room/low temperature mechanical properties
CN112647021BActive Publication Date: 2021-10-15SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
Publication Date
2021-10-15

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Abstract

The invention provides high-strength 9% Ni steel for ultra-low temperature engineering fasteners and a preparation method thereof, and relates to the technical field of low-temperature metal materials. The present invention adopts the vacuum induction + electroslag remelting smelting process, so that the high-strength 9% Ni steel for ultra-low temperature engineering fasteners of the present invention has higher purity and lower gas content; forging and supporting high-stable The heat treatment process of the microstructure, that is, quenching and tempering, makes the high-strength 9% Ni steel for ultra-low temperature engineering fasteners possess extremely excellent room / low temperature mechanical properties. The data of the embodiment shows that: the yield strength of the high-strength 9% Ni steel for ultra-low temperature engineering fasteners at room temperature is greater than 800 MPa, the elongation after fracture is greater than 20%, the reduction of area is greater than 65%, and the impact absorption energy of -196°C AKv is greater than 85J.
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Description

technical field

[0001] The invention relates to the technical field of low-temperature metal materials, in particular to high-strength 9% Ni steel for ultra-low temperature engineering fasteners and a preparation method thereof. Background technique

[0002] 9% Ni steel is currently the only martensitic steel that can be used at a low temperature of -196°C. 9% Ni steel not only has high yield strength and yield strength, but also has excellent low temperature toughness and welding performance. In the prior art, in order to improve the low-temperature toughness of 9% Ni steel forgings, QLT is generally used during heat treatment, that is, the method of "complete quenching + sub-temperature quenching + tempering" to improve its toughness. V-type impact energy can reach more than 80J, but due to the use of sub-temperature quenching, its yield strength is generally between 500 and 650MPa.

[0003] When 9% Ni steel is used as a fastener in large-scale low-temperature equipment a...

Claims

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