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High-strength anticorrosion steel for gas valve and heat treatment process of high-strength anticorrosion steel

A high-strength, valve technology, applied in the field of metal smelting and processing, can solve the problems of unstable opening and closing torque and sealing performance, increase of operating torque, and inability to match the service life of PE pipes, etc., to achieve the suppression of dislocation substructure recovery , Inhibit high temperature temper brittleness, enhance the effect of secondary hardening effect

Inactive Publication Date: 2017-05-10
ENG EQUIP CO LTD SUZHOU SAI SIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, valves in gas pipelines at home and abroad are generally divided into two categories in terms of materials, one is PE ball valves, and the other is metal ball valves, both of which have significant advantages and disadvantages. Due to the limitations of material properties, there are many shortcomings, such as insufficient rigidity of the product, which may easily lead to unstable opening and closing torque and sealing performance during geological subsidence, thermal expansion and contraction; Thoroughly, when sand and other sundries are accumulated, the ball core is easily damaged, resulting in a decrease in sealing performance; when it is left standing for a long time or closed for a long time under pressure, the operating torque is likely to increase significantly, which is likely to cause the operation cap Damage to other accessories will affect long-term performance
Metal ball valves also have unique advantages, but their application in PE gas pipelines is unsatisfactory. For example, the anti-corrosion performance is not ideal. If they are not properly treated, their service life will be short, which cannot match the 50-year service life of PE pipelines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The above-mentioned high-strength anti-corrosion steel for gas valves provided in this embodiment has the following mass percentages of chemical components: C: 0.02%, Cr: 10.5%, Si: 0.15%, Mn: 0.62%, Ni: 0.45%, Re: 0.15%, Nb: 0.27%, Al: 0.31%, Y: 0.11%, Ti: 0.13%, Ca: 0.75%, B: 0.82%, Co: 0.41%, Mo: 0.23%, S≤0.03%, P≤0.02%, rare earth metal: 0.23%, the balance is Fe;

[0041] The chemical composition mass percentage of the rare earth metal is: Pm: 13%, Lu: 8%, Dy: 3%, Gd: 0.8%, and the balance is La;

[0042] The first phase in the anti-corrosion steel is austenite, the second phase is martensite, the volume percentage of the second phase from the surface to 1 / 4 thickness is 3.6%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 5.7 %; the average grain diameter of austenite from the surface to 1 / 4 thickness of the stainless steel is 4.2 μm, the average grain diameter of martensite is 3.8 μm, and the average grain diameter of austenite ...

Embodiment 2

[0049] A high-strength anti-corrosion steel for gas valves provided in this example, the mass percent of its chemical composition is: C: 0.03%, Cr: 10.8%, Si: 0.17%, Mn: 0.68%, Ni: 0.49%, Re: 0.16%, Nb: 0.32%, Al: 0.32%, Y: 0.12%, Ti: 0.14%, Ca: 0.76%, B: 0.85%, Co: 0.43%, Mo: 0.27%, S≤0.03%, P≤ 0.02%, rare earth metal: 0.29%, the balance is Fe;

[0050] The chemical composition mass percentage of the rare earth metal is: Pm: 16%, Lu: 10%, Dy: 5%, Gd: 1.5%, and the balance is La;

[0051] In this anti-corrosion steel, the first phase is austenite, and the second phase is martensite. The volume percentage of the second phase from the surface to 1 / 4 thickness is 3.7%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 5.9. %; the average austenite grain diameter from the surface to 1 / 4 thickness of the stainless steel is 4.3 μm, the average martensite grain diameter is 3.9 μm, and the average austenite grain diameter from 1 / 4 thickness to the cent...

Embodiment 3

[0058] A high-strength anti-corrosion steel for gas valves provided in this example, the mass percent of its chemical composition is: C: 0.04%, Cr: 11.7%, Si: 0.19%, Mn: 0.73%, Ni: 0.52%, Re: 0.17%, Nb: 0.38%, Al: 0.33%, Y: 0.13%, Ti: 0.15%, Ca: 0.77%, B: 0.88%, Co: 0.45%, Mo: 0.31%, S≤0.03%, P≤ 0.02%, rare earth metal: 0.36%, the balance is Fe;

[0059] The mass percentage of the chemical composition of the rare earth metal is: Pm: 18%, Lu: 11%, Dy: 6%, Gd: 2.4%, and the balance is La;

[0060] In this anti-corrosion steel, the first phase is austenite, the second phase is martensite, the volume percentage of the second phase from the surface to 1 / 4 thickness is 3.8%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.1 %; the average grain diameter of austenite from the surface to 1 / 4 thickness of the stainless steel is 4.5 μm, the average grain diameter of martensite is 4.0 μm, and the average grain diameter of austenite from 1 / 4 thickness ...

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Abstract

The invention discloses high-strength anticorrosion steel for a gas valve. The high-strength anticorrosion steel is composed of, by mass, 0.02-0.04% of C, 10.5-11.7% of Cr, 0.15-0.19% of Si, 0.62-0.73% of Mn, 0.45-0.52% of Ni, 0.15-0.17% of Re, 0.27-0.38% of Nb, 0.31-0.33% of Al, 0.11-0.13% of Y, 0.13-0.15% of Ti, 0.75-0.77% of Ca, 0.82-0.88% of B, 0.41-0.45% of Co, 0.23-0.31% of Mo, less than or equal to 0.03% S, less than or equal to 0.02% of P, 0.23-0.36% of rare earth metal and the balance Fe. The alloy elements of Co, Mo, Cr and Ti in the high-strength anticorrosion steel can improve the martensite tempering resistance and suppress dislocation substructure recovery; and Ni can improve the toughness of ferrite matrixes and refine crystal particles, the plasticity and toughness of the steel can be improved, the cleavage tendency is reduced, the nuclear driving force of Mo2C is improved through Co, and precipitation of fine and dispersed compounds containing Mo is facilitated.

Description

technical field [0001] The invention relates to an anti-corrosion steel and a heat treatment method thereof, in particular to a high-strength anti-corrosion steel for a gas valve and a heat treatment process thereof, belonging to the technical field of metal smelting and treatment. Background technique [0002] The valve is a very important part of the gas pipeline, and it is also one of the products with high technical content in the gas pipeline. At present, valves in gas pipelines at home and abroad are generally divided into two categories in terms of materials, one is PE ball valves, and the other is metal ball valves, both of which have significant advantages and disadvantages. Due to the limitations of material properties, there are many shortcomings, such as insufficient rigidity of the product, which may easily lead to unstable opening and closing torque and sealing performance during geological subsidence, thermal expansion and contraction; Thoroughly, when sand a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/50C22C38/52C22C38/54C22C38/44C22C38/02C22C38/04C22C38/06C21D6/00
CPCC22C38/48C21D6/004C21D6/005C21D6/007C21D6/008C21D2211/001C21D2211/008C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/52C22C38/54
Inventor 钱燕华陈平
Owner ENG EQUIP CO LTD SUZHOU SAI SIDE
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