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F304/F304L double-standard stainless steel flange and production process thereof

A production process, stainless steel technology, applied in flange connection, pipe/pipe joint/pipe fitting, mechanical equipment, etc., can solve the problems of intergranular corrosion resistance not as good as F304L material, high temperature and pressure of process system, and achieve good sealing effect, The effect of uniform distribution and reasonable structure

Active Publication Date: 2015-07-22
WUXI HUAERTAI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In petrochemical production, various media are highly corrosive to equipment and pipelines, and the temperature and pressure of the process system are high. At present, the single-grade stainless steel F304 or F304L used in engineering has its own advantages and disadvantages. The high-temperature performance of F304 material is worse than F304L material, but the intergranular corrosion resistance is not as good as F304L material, so it is difficult to find a material that is both resistant to intergranular corrosion and has better high temperature performance.

Method used

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  • F304/F304L double-standard stainless steel flange and production process thereof
  • F304/F304L double-standard stainless steel flange and production process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides a F304 / F304L double standard stainless steel material flange, the structure is as follows figure 1 , figure 2 As shown, it includes a through hole 1 and a flange piece. The flange piece is a disc-shaped structure. The through hole 1 is set on the central axis of the flange piece. Boss 2 and groove 9 are provided. The flange includes front flange 3, middle flange 5 and rear flange 7, and the three are arranged in parallel in turn. Front flange 3, middle flange 5 The diameter is equal to that of the rear flange 7, and the thickness of the front flange 3 is the same as that of the rear flange 7, and 4 fixing holes are evenly arranged on it, the front fixing hole 4, the middle fixing hole 6 and the rear fixing hole 8. The apertures are equal in size and corresponding in position.

[0028] The distance between the aforementioned front flange piece 3 and the middle flange piece 5 is equal to the distance between the middle flange piece 5 and the re...

Embodiment 2

[0030] This embodiment provides a production process of F304 / F304L double-standard stainless steel flange, the process steps are: melting - forging - heat treatment - trimming - ultrasonic testing - sampling analysis, wherein:

[0031] Melting: After the analysis is qualified, the alloy blank below 5000Kg is selected, and the vacuum arc remelting or electroslag remelting is adopted. The melting temperature is 2950°C. The chemical composition and mass percentage of the alloy blank are: Cr: 18.3%, Ni: 9.1%, C : 0.07%, Mo: 0.21%, Cu: 0.52%, Si: 0.89%, Nb: 0.14%, Ti: 0.097%, Ca: 0.15%, Se: 0.05%, Te: 0.15%, S: 0.015%, P : 0.021%, the rest is Fe and unavoidable impurities;

[0032] Forging: put the alloy billet smelted at high temperature into the furnace for heat preservation, the heat preservation temperature is 1050°C, and the heat preservation time is 7 hours, and then forge, the forging method adopts free forging, the forging ratio is controlled to 3.5, and the scale is remove...

Embodiment 3

[0039] This embodiment provides a production process of F304 / F304L double-standard stainless steel flange, the process steps are: melting - forging - heat treatment - trimming - ultrasonic testing - sampling analysis, wherein:

[0040] Melting: After the analysis is qualified, the alloy blank below 5000Kg is selected, and the vacuum arc remelting or electroslag remelting is adopted. The melting temperature is 3150°C. The chemical composition and mass percentage of the alloy blank are: Cr: 18.5%, Ni: 9.3%, C : 0.09%, Mo: 0.25%, Cu: 0.54%, Si: 0.93%, Nb: 0.16%, Ti: 0.099%, Ca: 0.17%, Se: 0.15%, Te: 0.19%, S: 0.025%, P : 0.023%, the rest is Fe and unavoidable impurities;

[0041] Forging: put the alloy billet smelted at high temperature into the furnace for heat preservation, the heat preservation temperature is 1090°C, and the heat preservation time is 5h, and then forge, the forging method adopts free forging, the forging ratio is controlled to 4.5, and the scale is removed, an...

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Abstract

The invention discloses an F304 / F304L double-standard stainless steel flange. The F304 / F304L double-standard stainless steel flange comprises a through hole and a flange plate. The flange plate is of a disc structure, the through hole is formed perpendicular to the flange plate with the center axis of the flange plate serving as the center line, and the edges of the two ends of the through hole are provided with a boss and a groove respectively. The flange plate comprises a front flange plate body, a middle flange plate body and a rear flange plate body which are sequentially arranged in parallel, the diameters of the front flange plate body, the middle flange plate body and the rear flange plate body are equal, the thicknesses of the front flange plate body and the rear flange plate body are equal, at least four fixing holes are evenly formed in each flange plate body, the hole diameters of the front fixing holes, the middle fixing holes and the rear fixing holes are equal, and the positions of the front fixing holes, the middle fixing holes and the rear fixing holes correspond. The invention further discloses a production process of the F304 / F304L double-standard stainless steel flange. The F304 / F304L double-standard stainless steel flange is high in rigidity and strength, resistant to corrosion, ingenious in structural design, high in practicality and long in service life.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and relates to a F304 / F304L double-standard stainless steel flange and a production process thereof. Background technique [0002] In petrochemical production, various media are highly corrosive to equipment and pipelines, and the temperature and pressure of the process system are high. At present, the single grade stainless steel F304 or F304L used in the project has its own advantages and disadvantages. The high temperature performance of F304 material is worse than F304L material, but its resistance to intergranular corrosion is not as good as that of F304L material, so it is difficult to find a material that is both resistant to intergranular corrosion and has better high temperature performance. [0003] The chemical composition of F304 / 304L material is the same as that of F304L, and the high temperature performance is the same as that of F304, so it has good intergranular corrosion re...

Claims

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Application Information

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IPC IPC(8): F16L23/032C22C38/60C21D6/00C21D1/28
CPCC21D1/28C21D6/00C22C38/60F16L23/032
Inventor 李忠云
Owner WUXI HUAERTAI MACHINERY MFG
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