Manufacturing method of molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tube

A chromium alloy and molten salt-resistant technology is applied in the field of preparation of molten salt corrosion-resistant nickel-molybdenum-chromium alloy seamless pipes, which can solve the problems that seamless pipes cannot meet the requirements of molten salt reactors, have high Mo content, and cannot be applied. Achieve excellent room temperature and high temperature mechanical properties and organizational stability

Active Publication Date: 2016-12-07
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI +1
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Problems solved by technology

However, due to the high content of Mo in nickel-molybdenum-chromium alloys resistant to molten salt corrosion, this type of alloy has problems such as large processing resistance, severe work hardening, and easy processing cracking, which has brought huge challenges to the manufacture of seamless pipes. challenge
After a large number of experiments, it was found that for nickel-molybdenum-chromium alloys resistant to molten salt corrosion, the existing nickel-based superalloy seamless pipe preparation process is completely unsuitable. On the one hand, the yield rate is extremely low; The high temperature and room temperature properties (tensile strength, molten salt corrosion resistance, ductility, structural stability, etc.) of salt corrosion nickel molybdenum chromium alloy have a destructive effect, resulting in the final seamless pipe not meeting the requirements of molten salt reactors

Method used

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  • Manufacturing method of molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tube
  • Manufacturing method of molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tube

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preparation example Construction

[0021] Aiming at the material characteristics of molten salt corrosion-resistant nickel-molybdenum-chromium alloy, the present invention proposes a preparation method of molten salt corrosion-resistant nickel-molybdenum-chromium alloy seamless pipe by optimizing the process, so as to efficiently prepare the molten salt reactor. Use various specifications of molten salt corrosion-resistant nickel-molybdenum-chromium alloy seamless pipes. The preparation method of the present invention specifically comprises the following steps:

[0022] Step 1. Perform hot extrusion treatment on the molten salt corrosion-resistant nickel-molybdenum-chromium alloy tube billet with a through hole to obtain a blank tube for cold rolling; the extrusion temperature of the hot extrusion treatment is 1220-1250 ° C, and the extrusion The pressure ratio is 5-12; in order to further improve product performance, it is best to anneal and surface polish the blank tube obtained after hot extrusion treatment;...

Embodiment 1

[0027] Use an alloy tube billet with a diameter of 210mm and a length of 1000mm (obtained by drilling a forged alloy rod), preheat it in a ring heating furnace to 800°C, and transfer it to the induction heating station before hot extrusion by a manipulator , the alloy tube billet is heated to an extrusion temperature of 1220°C. On a 3500t hot extrusion machine, the nickel-molybdenum-chromium alloy tube billet was hot-extruded at a hot-extrusion temperature of 1220°C and a hot-extrusion ratio of 1:5, and a qualified blank tube was successfully obtained, and the surface quality of the blank tube was good , the surface is uniform without obvious defects affecting cold rolling. Annealing treatment and surface grinding treatment are performed on the blank pipe obtained after hot extrusion treatment. (In addition, in the case of other conditions being the same, this embodiment also carried out hot extrusion treatment on the alloy tube billet at an extrusion temperature of 1200 ° C ...

Embodiment 2

[0034] Use an alloy tube billet with a diameter of 210mm and a length of 1000mm (obtained by drilling a forged alloy bar), preheat it to 800°C in a ring heating furnace, and transfer it to the induction heating process before hot extrusion with a manipulator. The alloy tube blank is heated to an extrusion temperature of 1250°C. On a 3500t hot extrusion machine, the nickel-molybdenum-chromium alloy tube blank is hot-extruded at a hot extrusion temperature of 1250°C and a hot extrusion ratio of 1:12 , Successfully obtained a qualified blank pipe, the surface quality of the blank pipe is good, the surface is uniform and there is no obvious defect affecting cold rolling. The blank pipe obtained after the hot extrusion treatment is annealed and surface polished.

[0035] Rolling is carried out on a three-roll rolling mill, and after five passes of rolling, a branch pipe with a specification of Φ141.3*6.55mm is obtained. The single reduction ratios of the five passes are respectivel...

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Abstract

The invention discloses a manufacturing method of a molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tube. The manufacturing method comprises the steps that firstly, hot extrusion treatment is conducted on a molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy tube blank which is provided with a through hole, so that a pierced billet for cold rolling is obtained, wherein the extrusion temperature of the hot extrusion treatment is 1220-1250 DEG C, and the extrusion ratio is 5-12; secondly, the pierced billet obtained in the first step is cold rolled to be a tube of a required specification, wherein in the cold rolling process, the single-pass rolling reduction of each pass is 20%-70%, and after each pass is completed, intermediate heat treatment and acid pickling are conducted on the tube firstly, and then rolling of the next pass is conducted, wherein the intermediate heat treatment temperature is 1180-1220 DEG C; and thirdly, final heat treatment is conducted on the tube of the required specification in the temperature range from 1180 DEG C to 1220 DEG C. The invention further discloses the molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tube and a structural member for a molten salt reactor. By the adoption of the manufacturing method, various specifications of molten-slat-corrosion-resisting nickel-molybdenum-chromium alloy seamless tubes meeting molten salt reactor use requirements can be efficiently manufactured.

Description

technical field [0001] The invention relates to a method for preparing a seamless pipe, in particular to a method for preparing a molten salt corrosion-resistant nickel-molybdenum-chromium alloy seamless pipe. Background technique [0002] The fourth-generation nuclear reactor-molten salt reactor has become an important development direction in the future nuclear power field because of its inherent safety and high efficiency. The operating temperature of the reactor is 600°C to 700°C, and highly corrosive molten salt is used as the coolant. Therefore, the reactor structural material must have excellent corrosion resistance to high temperature molten salt. To meet the harsh working conditions of molten salt reactors, only a special type of nickel-based superalloy—nickel-molybdenum-chromium alloy resistant to molten salt corrosion can be used at present, such as Hastelloy N alloy developed by Oak Ridge Laboratory in the United States or developed by scientific research institu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22C19/05C22F1/10G21C15/02
CPCB21C37/06C22C19/057C22F1/10G21C15/02Y02E30/30
Inventor 梁建平王宝顺李志军苏诚李肖科王曼
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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