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Machining process of large duplex stainless steel impeller

A duplex stainless steel and processing technology is applied in the processing technology of large-scale duplex stainless steel impeller, impeller processing technology, and the field of producing large-scale duplex stainless steel impeller for nuclear power, which can solve the problems of difficult control of processing process and large deformation of processing size. Achieve the effect of meeting the drawing size requirements and technical requirements, good processing dimensional accuracy, and high processing efficiency

Active Publication Date: 2013-12-04
SHENYANG SANKE VALVES IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems existing in the above-mentioned prior art, and provides a processing technology for a large-scale duplex stainless steel impeller, which solves the problems in the prior art that the processing process is difficult to control and the processing size is greatly deformed, and the present invention reduces the cost, increased productivity

Method used

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  • Machining process of large duplex stainless steel impeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] a. For impeller casting, mix molten steel according to ASTM 890 Gr5A standard, and cast the workpiece, and test block of molten steel in the same furnace; the size of the test block is implemented according to ASTM A370 standard; the cutting cap is cleaned and polished; use zx5-1250 air planer to cut quickly Riser to ensure casting size;

[0040] b. Deformation protection before heat treatment, place the workpiece obtained from the above casting on a flat bracket, and hoist the flat bracket when the workpiece enters and exits the furnace to prevent thermal deformation of the workpiece during hoisting;

[0041] c. Solution treatment, heat the above-mentioned protected workpiece to 1120°C±10°C and keep it warm for 7H, then quickly take it out of the furnace, quench and cool it in water, and re-inspect the test block for heat treatment in the same furnace;

[0042] d. Rough grinding I, cleaning and rough grinding the workpiece after the above solution treatment, and visua...

Embodiment 2

[0057] In the step c, keep warm for 9H, then quickly take out the furnace and quench in water; in the step j, keep warm for 30H, and other steps are the same as in Example 1.

Embodiment 3

[0059] In the step c, keep warm for 5H, and then quickly take it out of the furnace and quench in water; in the step j, keep warm for 36H, and other steps are the same as in Example 1.

[0060] The composition weight percent composition of molten steel in the step a of the present invention is as shown in Table 1, and the remaining composition is iron and unavoidable trace elements.

[0061] The mechanical properties of the present invention are as shown in table 2 after inspection.

[0025] In the step f, according to the ASME SE1030 metal radiography inspection standard test method, the rest of the surface liquid penetration inspection.

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Abstract

The invention relates to a machining process of a large duplex stainless steel impeller. The machining process comprises the steps of casting, thermal treatment of a front deformation protector, solutionizing treatment, finishing and rough polishing, component re-inspection, mechanical property inspection, RT radiographic inspection, defect treatment, repair welding and rough polishing, rough machining, trimming, stress relief thermal treatment, semi-finish machining, fine polishing, finish machining, balance test duplicate removal and the like. The machining process is small in hardening effect, small in dimension deformation, good in impeller machining dimension accuracy and high in surface smoothness. The work completion size inspection is controlled at the temperature lower than 40 DEG C. In addition, the processing efficiency is high, the quality is good, the dimensional accuracy and the position dimension tolerance deformation of the impeller can be ensured to be small, and the graph dimension requirement and the technical requirements can be met.

Description

technical field [0001] The invention relates to a processing technology of an impeller, in particular to a processing technology of a large-scale duplex stainless steel impeller, which is especially suitable for producing a large-scale duplex stainless steel impeller for nuclear power, and belongs to the technical field of material processing engineering. Background technique [0002] Large duplex stainless steel impellers are mainly used in nuclear power plant volute seawater circulation pumps. Duplex stainless steel impellers are widely used in seawater circulation pumps, seawater booster pumps, seawater desalination and transportation in various nuclear power plants at home and abroad. In the prior art, due to the combined influence of materials and processing steps, especially for large duplex steel impellers with a diameter of more than 2000mm, the processing process is difficult to control, the castings are deformed after casting, and the machining allowance is uneven....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 胡小军吕桂云张俊波
Owner SHENYANG SANKE VALVES IND CO LTD
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