Manufacturing method of stainless steel special pipe for nuclear fusion reactor
A manufacturing method, stainless steel technology, which is applied in the field of hot-rolled and cold-processed steel material forming, can solve the problem of poor control of the curvature of the waste pipe, the accuracy of the cross-sectional dimension, the surface roughness, the large machining workload, and the difficulty of non-destructive testing. And other issues
Active Publication Date: 2014-11-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
If the plate tailor welding method is used, firstly, the long weld seam will greatly reduce the reliability of the material and increase the difficulty of non-destructive testing. Secondly, the ferrite phase produced in the heat-affected zone of the weld seam does not meet the non-magnetic requirements. The special shape of the circle can require a lot of machining work
The technology of domestic hot-extruded stainless steel special-shaped pipe is still in its infancy, and the control of the curvature, cross-sectional dimension accuracy, and surface roughness of the waste pipe is poor, and it cannot meet the requirements of this product
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[0078] The process steps of the present invention are: molten iron pretreatment→converter smelting→VOD vacuum decarburization refining→injecting steel ingot→electroslag remelting→forging tube billet→hot extrusion→cold working→solution annealing heat treatment in protective atmosphere→inner surface broaching →The outer surface is polished.
[0079] 1. Smelting and tube billet processing
[0080] Using molten iron as raw material, after pretreatment to remove P and S, carry out converter smelting into crude molten steel, VOD vacuum decarburization and refining, casting into mold casting billets, electroslag remelting, billet hot rolling into square billets, forging to 230mm diameter of round ingots. In order to make the material free of ferrite phase to ensure non-magnetism, and have good low-temperature strength and low-temperature toughness, the preferred Cr content is 17.50~18.50, Ni content is 12.0-14.0, C content<0.020, P content<0.02, S content<0.003 , <make the phase po...
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The invention relates to a manufacturing method of a stainless steel special seamless pipe for a nuclear fusion reactor, and belongs to the forming technology of steel and iron materials through hot rolling and cold processing. The method comprises the processes of: smelting through a converter (wherein molten iron is taken as a raw material), VOD vacuum decarburization, hot extrusion forming, cold processing of a steel pipe and thermal treatment in a protective atmosphere. The method is characterized in that (1), a smelting method comprising the steps of smelting through the converter(wherein molten iron is taken as the raw material) and VOD vacuum decarburization is adopted; round billets are subjected to electro-slag re-smelting treatment; (2), a drawing die designed with a curve chamfer, a gradually reduced deformation region and a hard alloy module is adopted and reasonable process parameters are also adopted; and (3), a surface treatment method comprising the steps of thermal treating in the protective atmosphere, outer surface fine-polishing and inner surface broaching is adopted. Proved by more than twenty items of appearance size inspection, physical and chemical property inspection and non-destructive inspection, various property parameters completely satisfy design requirements of the nuclear fusion reactor, and therefore, the international advanced level for manufacturing the stainless steel special pipe for the nuclear fusion reactor is achieved.
Description
technical field [0001] The invention belongs to hot-rolled and cold-processed iron and steel material forming technology, in particular to a method for manufacturing stainless steel special-shaped tubes for nuclear fusion reactors, which has special cross-sectional shape, high surface finish, high straightness, non-magnetic, Good low temperature strength and low temperature toughness. Background technique [0002] Nuclear energy includes fission energy and fusion energy. Nuclear fission energy is the release of energy by protons in the nuclei of heavy metal elements through fission reactions, because heavy metal elements such as uranium required for fission are scarce on the earth, and conventional fission reactors will produce nuclear waste that is highly radioactive and difficult to decompose, limiting fission able development. Nuclear fusion energy mainly uses hydrogen isotopes to obtain huge energy through fusion reactions. It does not produce nuclear waste, does not p...
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IPC IPC(8): B21C37/06C21D8/10C22C38/52C22C38/44
Inventor 王伯文康喜唐陈洪琪刘承志侯楠程逸明张晓拓雷锋张琳
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD