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Machining process of large super duplex stainless steel guide vane body

A kind of duplex stainless steel, processing technology technology

Inactive Publication Date: 2018-10-02
SHENYANG SANKE VALVES IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a processing technology for a large-scale super duplex stainless steel guide vane body, 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 Inventions reduce costs and increase productivity

Method used

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  • Machining process of large super duplex stainless steel guide vane body
  • Machining process of large super duplex stainless steel guide vane body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a. Guide vane body casting, mix molten steel according to ASME SA-995 CE3MN standard, and cast the workpiece, 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 , the riser can be cut quickly to ensure the size of the casting;

[0039] 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;

[0040] c. Solution treatment, heat the workpiece after the above protection to 1120°C±10°C and keep it for 5-6H, then cool it to 1045°C, keep it for 0.5H, then quickly take it out of the furnace, quench and cool it in water, and retest the test block in the same furnace heat treatment;

[0041] d. Rough grinding I, cleaning and rough grinding the...

Embodiment 2

[0055] In the step c, keep warm for 5.5H, then furnace cool to 1045°C, keep warm for 0.5H, then quickly take out of the furnace and quench in water; in step j, keep warm for 30H, other steps are the same as in Example 1.

Embodiment 3

[0057] In the step c, keep warm for 5.5H, then furnace cool to 1045°C, keep warm for 0.5H, then quickly take out of the furnace and quench in water; in step j, keep warm for 36H, other steps are the same as in Example 1.

[0058] 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.

[0059] The mechanical properties of the present invention are as shown in table 2 after inspection.

[0060] The present invention processes and tests the φ2910 guide vane body used for the discharge flange φ2970f8 of the metal volute type seawater circulating pump of a large nuclear power plant. 100% pass rate for size inspection, 100% pass rate for form and position tolerance, 100% pass rate for surface roughness, 100% reasonable blade inlet and outlet width. The drawings and technical requirements are met through acceptance inspection. And when the test is...

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Abstract

The invention relates to a machining process of a large super duplex stainless steel guide vane body. The machining process comprises the steps of casting, deformation protection before heat treatment, solid solution treatment, casting cleaning rough grinding, component rechecking, mechanical performance checking, PT dye penetrant inspection, defect cleaning-away repair welding rough grinding, rough machining, finishing, stress relief heat treatment, semi-finish machining, finish grinding finish machining and the like. According to the machining process, the machining hardening effect is small, size deformation is small, the machining size precision of the guide vane body is good, and surface smoothness is high. Finishing size checking is controlled to be below 40 DEG C; and the machiningefficiency is high, quality is good, the size precision and small form and position and dimensional tolerance deformation of the guide vane body can be guaranteed, and the drawing size requirement andthe technical requirement are met.

Description

technical field [0001] The invention relates to a guide vane body processing technology, in particular to a large super duplex stainless steel guide vane body processing technology, which is especially suitable for producing large super duplex stainless steel guide vane bodies for nuclear power, and belongs to the technical field of material processing engineering. Background technique [0002] Large super duplex stainless steel guide vanes are mainly used in metal volute seawater circulating pumps in nuclear power plants. Super duplex stainless steel guide vanes 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 joint influence of materials and processing steps, especially the large super duplex steel guide vane with a guide vane diameter exceeding 3000 mm, the processing process is difficult to control, the casting is deformed after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/02
CPCB23P15/02
Inventor 李佳兴胡佳平胡显俊邹本顺王璨谭鹏龙宋丽霞
Owner SHENYANG SANKE VALVES IND CO LTD
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