Manufacturing method for 304 stainless steel penetrating pole with rigidity of not less than 320HB for nuclear power
A technology of 304 stainless steel and manufacturing method, which is applied in the field of heat treatment of metal materials, can solve the problems of high manufacturing cost, achieve the effects of reducing product cost, improving pass rate, and solving high manufacturing cost
Active Publication Date: 2014-01-29
GUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS
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[0004] The purpose of the present invention is to integrate and improve the two methods in combination with the disadvantages and problems of the products manufactured by the above-mentioned two methods, reduce the surface cracks after cold deformation, achieve qualified hardness, and improve the quality of finished products. Qualification rate, reduce the cost of a single product, solve the problem of high manufacturing cost, meet the large demand of nuclear power plants, and provide a manufacturing method for 304 stainless steel bars with hardness ≥ 320HB for nuclear power
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[0013] Heat the ∮23±2×305±3mm bar in an electric furnace to 750±10°C, keep it warm for 1 to 1.5 hours, and then use the upper Haval mold 1 and the lower Haval mold 2 with a radius of 9mm to deform it into ∮18±1× 440±3mm bar stock. After the deformation is completed, its size inspection is qualified, that is, put it into a water tank with a water temperature of ≤40°C, and cool it to 20±5 minutes. After cooling, use the upper Haval mold 1 and the lower Haval mold 2 with a radius of 8mm again to deform them to a bar of ∮16±1×440±1mm at room temperature. After the deformation is completed, the size inspection is qualified, that is, two 20mm-long hardness samples are sawed from both ends of the bar, and processed into hardness test blocks, and then the hardness values of the two hardness test blocks are tested on the bench hardness tester. After testing, the hardness values at one end are 338, 337, and 340HB, and the hardness values at the other end are 341, 337, and 341HB. ...
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Abstract
The invention provides a manufacturing method of a 304 stainless steel penetrating pole with rigidity of not less than 320HB for nuclear power. The manufacturing method comprises the following steps: putting a bar material into an electric furnace, heating the bar mateiral to 750+ / -10 DEG C, preserving heat for 0.5-1.5h, after heat preservation, deforming the bar material by 5+ / -1mm by using upper and lower Harvard mould for the first time, if the dimensional inspection is passed after the deformation, putting the bar material into a water tank, cooling to a normal temperature, deforming the bar material for 2+ / -1mm by using the upper and lower Harvard mould for the second time, if the dimensional inspection is passed after the deformation, detecting the rigidity again after the rigidity detection is passed, and fine-machining the bar material to be a penetrating pole product. By adoption of the method, the surface crack of the penetrating pole is reduced, the rigidity is qualified, the percent of pass of the fine-machining is improved, the problem of high manufacturing cost is solved, the mass production can be satisfied, and consequently, the heavy demand of a nuclear power station can be satisfied.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a method for manufacturing a 304 stainless steel threaded bar with a hardness ≥ 320HB for nuclear power. Background technique [0002] The threading rod is usually used in the heavy water pump of the CARR project of the nuclear power plant. It has the characteristics of high hardness and corrosion resistance, and is a very important part. There are two traditional manufacturing methods, one is to forge the billet first, and then the billet is subjected to solution heat treatment, and the billet after solution heat treatment is subjected to cold deformation at room temperature, and the finished product after cold deformation has high hardness, However, there are many cracks and the pass rate is low. [0003] The other is to forge a billet first, and then carry out solution heat treatment on the billet. After solution heat treatment, the bille...
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IPC IPC(8): C21D8/06
Inventor万东海张令洪大钧石建平张自生冷廷梅汪洪宇
OwnerGUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS