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A manufacturing method of ferrite/martensitic steel hexagonal tube with controlled deformation
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A manufacturing method and technology of martensitic steel, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of different manufacturing shapes, different heat treatment systems, and unusable manufacturing, and achieve the effect of meeting strict requirements
Active Publication Date: 2022-03-11
CHINA INSTITUTE OF ATOMIC ENERGY
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[0005] The patent (patent publication number: CN 105112811 A) applied by the Hefei Institute of Material Science, Chinese Academy of Sciences describes in detail an austenitic stainless steel cladding tube for lead-bismuth fast reactor and its preparation method, but the object of the patent application is lead-bismuth The cladding tubes for fast reactors, and the cladding tubes described in the patent are not hexagonal tubes, and their manufacturing shapes and types of materials used are different. Among them, the manufacturing process is very different, the deformation form is also different, and the heat treatment system is completely different.
Therefore, the method and procedure for preparing the austenitic stainless steel cladding tube cannot be used for the manufacture of ferritic / martensitic steel hexagonal tubes for fast reactor core components
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Embodiment 1
[0062] Embodiment 1: Manufacture of controlled deformation of ferrite / martensitic steel hexagonal tube (1)
[0063] The size of the ferritic / martensitic steel hexagonal tube prepared in this embodiment is: 115mm (outer side distance)×3mm (wall thickness), including the following steps.
[0064] 1) Hot extrusion
[0065] After the forged bar is heated, it is hot-extruded, and the extrusion ratio is controlled at 5-15%. After water-cooling, the extruded pipe is obtained after roller straightening, pipe cutting, and surface grinding.
[0066] 2) Intermediate cold rolling and annealing
[0067] The extruded tube is cold-rolled in the middle of one pass, and the rolling speed is controlled not to exceed 200mm / min, and then degreased and cleaned. The intermediate heat treatment adopts black annealing, the annealing temperature is controlled at 820-880°C, and the holding time is 60-90min. After the intermediate heat treatment, the internal and external surfaces are ground and stra...
Embodiment 2
[0077] Embodiment 2: Manufacture of controlled deformation of ferrite / martensitic steel hexagonal tube (two)
[0078] The size of the ferritic / martensitic steel hexagonal tube prepared in this embodiment is: 59mm (outer side distance)×3mm (wall thickness). The preparation steps are basically the same as in Example 1, except that the middle cold rolling pass is 2 passes, and the ultrasonic flaw detection standard flaw is 0.15mm×0.3mm×3.0mm (depth×width×length).
[0079] The prepared hexagonal tube has a total length of 1449mm ± 0.5mm, a wall thickness within the range of (3 ± 0.1mm), and an inner distance between sides of 53 -0.1 +0.3 Within mm range, inner corner radius R=3.0mm, ridge line straightness<0.7mm / m, full-length straightness≤1.0mm / m, twist ≤40′ / full length, finished pipe inner and outer surface smoothness Ra≤1.6um. The grain size is grade 9, the mechanical properties meet the requirements in Table 1, and the metallographic structure and non-metallic inclusions all...
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Abstract
The invention belongs to the technical field of metallurgical materials, and relates to a method for manufacturing a ferrite / martensitic steel hexagonal tube with controlled deformation. The manufacturing method comprises the following steps in turn: (1) hot extrusion; (2) intermediate cold rolling and annealing; (3) round tube rolling hexagonal tube; (4) intermediate tube normalizing and tempering; (5) Finished cold rolling; (6) final heat treatment. Utilizing the manufacturing method of the ferrite / martensitic steel hexagonal tube of the present invention to control deformation, the obtained hexagonal tube can meet the requirements of the fast reactor core assembly on the straightness, wall thickness, and inner diameter of the ferrite / martensitic steel hexagonal tube. Strict requirements such as margins and twists.
Description
technical field [0001] The invention belongs to the technical field of metallurgical materials, and relates to a method for manufacturing a ferrite / martensitic steel hexagonal tube with controlled deformation. Background technique [0002] The sodium-cooled fast neutron reactor (hereinafter referred to as fast reactor) is a fourth-generation nuclear energy system. Compared with heavy water reactor or pressurized water reactor, the core fuel assembly needs to achieve higher burnup at a higher temperature. [0003] The hexagonal tube in the fast reactor fuel assembly is one of the most important parts in the reactor core. It works in the temperature range of 360-600°C for a long time, and is corroded by the coolant sodium and damaged by high-dose radiation above 100dpa. The hexagonal tube is the structural support of the fuel bundle of the core assembly, which realizes the radial restraint of the bundle and provides the flow path for the coolant sodium. By designing an approp...
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