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Large-diameter flange and preparation process thereof

A manufacturing process and large-diameter technology, applied in the field of large-diameter flanges and their manufacturing processes, can solve the problems of not meeting the requirements of large-diameter flanges, low tensile strength of flanges, small surface roughness, etc., and achieve defects The effects of obvious relief, grain refinement, and uniform structure refinement

Active Publication Date: 2014-12-10
WUXI HUAERTAI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Flange materials generally include: carbon steel, alloy steel and stainless steel; large-diameter flanges require good tensile strength, high yield strength, and small surface roughness; and high prior art, due to the limitations of composition and heat treatment process, thus As a result, the tensile strength of the flange is not high, the yield strength is not high, the surface roughness is high, and there are problems such as loose tissue, pores, trachoma, etc., which do not meet the requirements for the use of large diameter flanges, or the service life is short

Method used

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  • Large-diameter flange and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The mass percentage of the large diameter flange of this embodiment is: C: 0.65%, Si: 0.25%, Mn: 0.85%, Ni: 9%, Cr: 2%, Nb: 0.15%, Cu: 0.85 %, N: 0.02%, Mo: 0.13%, Al: 0.2%, S: 0.07%, Ti: 0.03%, V: 0.02%, B: 0.002%, lanthanide rare earth: 6%, the balance is Fe; The mass percentages of the components of the lanthanide rare earths are: lanthanum: 20%, cerium: 25%, samarium: 16%, neodymium: 14%, gadolinium: 2%, praseodymium: 17%, dysprosium: 5%, and the remaining lanthanides :1%.

[0026] The manufacturing process of the large-diameter flange in this embodiment is carried out according to the following procedures: billet blanking-forging-forging size and surface inspection-heat treatment-mechanical rough machining-ultrasonic inspection-mechanical performance test-mechanical finishing to the required shape and size -Clean coating; Among them, billet blanking, forging, forging size and surface inspection, mechanical rough machining, ultrasonic inspection, mechanical perform...

Embodiment 2

[0034] The mass percentage of the large diameter flange of this embodiment is: C: 0.45%, Si: 0.30%, Mn: 0.95%, Ni: 11%, Cr: 3%, Nb: 0.20%, Cu: 0.95 %, N: 0.03%, Mo: 0.14%, Al: 0.3%, S: 0.08%, Ti: 0.04%, V: 0.03%, B: 0.003%, lanthanide rare earth: 7%, the balance is Fe; The mass percentages of the lanthanide rare earth components are: lanthanum: 24%, cerium: 20%, samarium: 15%, neodymium: 15%, gadolinium: 3%, praseodymium: 16%, dysprosium: 6%, and the remaining lanthanides :1%.

[0035] The manufacturing process of the large-diameter flange in this embodiment is carried out according to the following procedures: billet blanking-forging-forging size and surface inspection-heat treatment-mechanical rough machining-ultrasonic inspection-mechanical performance test-mechanical finishing to the required shape and size -Clean coating; Among them, billet blanking, forging, forging size and surface inspection, mechanical rough machining, ultrasonic inspection, mechanical performance te...

Embodiment 3

[0043] The mass percentage of the large diameter flange of this embodiment is: C: 0.55%, Si: 0.25%, Mn: 0.90%, Ni: 10%, Cr: 2%, Nb: 0.18%, Cu: 0.90 %, N: 0.04%, Mo: 0.15%, Al: 0.2%, S: 0.09%, Ti: 0.03%, V: 0.02%, B: 0.004%, lanthanide rare earth: 8%, and the balance is Fe; The mass percentages of the lanthanide rare earth components are: lanthanum: 20-24%, cerium: 20-25%, samarium: 14-16%, neodymium: 14-16%, gadolinium: 2-4%, praseodymium: 16- 18%, dysprosium: 5-6%, other lanthanides: 1-3%.

[0044] The manufacturing process of the large-diameter flange in this embodiment is carried out according to the following procedures: billet blanking-forging-forging size and surface inspection-heat treatment-mechanical rough machining-ultrasonic inspection-mechanical performance test-mechanical finishing to the required shape and size -Clean coating; Among them, billet blanking, forging, forging size and surface inspection, mechanical rough machining, ultrasonic inspection, mechanical ...

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Abstract

The invention discloses a large-diameter flange and a preparation process thereof. The large-diameter flange comprises the following chemical components by weight percent: 0.45 to 0.65% of C, 0.25 to 0.30% of Si, 0.85 to 0.95% of Mn, 9 to 11% of Ni, 2 to 3 % of Cr, 0.15 to 0.20% of Nb, 0.85 to 0.95% of Cu, 0.02 to 0.04% of N, 0.13 to 0.15% of Mo, 0.2 to 0.3% of Al, 0.07 to 0.09% of S, 0.03 to 0.04% of Ti, 0.02 to 0.03% of V, 0.002 to 0.004% of B, 6 to 8% of lanthanide rare earth, and the balance of Fe. The processes of twice normalizing and twice tempering and the cooling thermal treatment process are adopted, the flange is guaranteed to have high tensile strength, high yield strength and smaller surface roughness, the structure is more stable and more uniform, and air holes and sand holes are little.

Description

technical field [0001] The invention relates to a flange and a manufacturing process, in particular to a large-diameter flange and a manufacturing process thereof. Background technique [0002] Flange is otherwise known as flange or flange. Flanges are parts that connect the pipes to each other and are connected to the pipe ends; they are also useful for flanges on equipment inlets and outlets, And can be used as connection between two equipments, example reducer flanges. Flange connection or flange joint refers to the detachable connection of flange, gasket and bolt as a group of combined sealing structure. Pipe flange refers to the flange used for piping in pipeline installations. Upper refers to the inlet and outlet flanges of the equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flanges are divided into threaded (screw connection) flanges, welding flanges and clip flanges. [0003] Flange ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D9/40C21D1/28
Inventor 李忠云
Owner WUXI HUAERTAI MACHINERY MFG
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