Manufacture process of high-strength retaining ring for megawatt nuclear power units
A nuclear power unit and manufacturing process technology, which is applied in the field of ring forging, can solve the problems that the technical indicators of the retaining ring cannot meet the requirements, the manufacturing difficulty is large, and the manufacturing process of the high-strength retaining ring is immature.
Active Publication Date: 2019-06-21
ZHANGJIAGANG HAILU ANNULAR FORGINGS
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Problems solved by technology
However, since the manufacture of 1Mn18Cr18N steel retaining rings is very difficult, and the existing megawatt-level nuclear power units have higher requirements for the retaining rings, 1Mn18Cr18N is used to manufacture high-strength retaining rings for megawatt-level nuclear power units. The technology is still immature, and the technical indicators of the manufactured retaining ring cannot meet the requirements
Method used
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Experimental program
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Embodiment Construction
[0015] The present invention will be further described in detail below in conjunction with specific embodiments.
[0016] The manufacturing process of high-strength retaining rings for megawatt nuclear power units, the process steps are as follows: blanking → heating before forging → upsetting, relay punching, horse frame reaming → heating before forging → ring rolling → rough car flaw detection → solidification Melting heat treatment→cold deformation strengthening→stress relief heat treatment→finish turning;
[0017] (1) Cutting: The steel grade is 1Mn18Cr18N electroslag ingot as raw material, and its chemical composition requirements are as follows: C: ≤0.12%, Si: ≤0.80%, Mn: 17.50~20.00%, P: ≤0.050%, S: ≤0.015%, Cr: 17.50~20.00%, Al: ≤0.030%, N: ≥0.47%, B: ≤0.001%; before blanking, remove the hardened layer, slag, pits, grooves on both ends of the ingot, Defects such as inclination; the size of the billet obtained by blanking is φ414×φ422×585, and the weight is about 633...
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Abstract
The invention discloses a manufacturing process for a high-strength retaining ring of a million megawatt nuclear power unit. The manufacturing process sequentially comprises steps of material preparation, primary heating before forging, upsetting and drawing and relay punching and frame broaching, secondary heating before forging, ring rolling, rough turning flaw detection, solution heat treatment, cold deformation strengthening, stress relief heat treatment and finish turning machining. Technical indexes of the retaining ring produced by adopting the manufacturing process of the high-strengthretaining ring of the million megawatt nuclear power unit can reach the standard that the yield strength Rp0.2 (Mpa) is larger than or equal to 1150, the tensile strength Rm (Mpa) ranges from 1170 to1320, the elongation A (%) is larger than or equal to 18, the impact power KV2 (J) is larger than or equal to 75, the magnetic permeability (miu r) is less than or equal to 1.05, and the grain size is 2nd grade regulated by GB / T6394 or more fine.
Description
technical field [0001] The invention relates to the field of ring forging, in particular to a manufacturing process for a high-strength retaining ring of a megawatt nuclear power unit. Background technique [0002] The retaining ring is one of the main parts of the steam turbine generator set, and it is the part with the highest stress of the steam turbine set. In order to ensure the safe operation of the unit, the retaining ring is required to have sufficiently high strength, high plasticity index, uniform mechanical properties and minimum residual stress. For larger capacity units (300MW or more), the yield strength of the retaining ring is required to be above 1000MPa. The retaining ring works in a strong magnetic field and humid corrosive medium, and the working temperature is below 100°C. In order to reduce the current loss of the wall coil and prevent the working temperature from being too high, it is generally made of austenitic steel. Most of the retaining ring for...
Claims
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 徐锋朱乾皓万明珍马苏张斌范禹
Owner ZHANGJIAGANG HAILU ANNULAR FORGINGS