CN102808110B - Nickel-based alloy wire material used for coating layer of sealing surface of stainless steel valve - Google Patents

Nickel-based alloy wire material used for coating layer of sealing surface of stainless steel valve Download PDF

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CN102808110B
CN102808110B CN201210305856.0A CN201210305856A CN102808110B CN 102808110 B CN102808110 B CN 102808110B CN 201210305856 A CN201210305856 A CN 201210305856A CN 102808110 B CN102808110 B CN 102808110B
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nickel
alloy
base alloy
based alloy
stainless steel
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CN102808110A (en
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杨学焦
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Ningbo Tiantai Environmental Technology Co Ltd
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Abstract

The invention discloses a nickel-based alloy wire material used for a coating layer of a sealing surface of a stainless steel valve. The nickel-based alloy is composed of components according to the percentage by weight as follows: 14.0-16.0% of Mo, 22.5-24.5% of Cr, 5.5-6.5% of W, 1.0-1.5% of Ti, 0.8-1.2% of Nb, 0.8-1.2% of Mn, 0.05-0.1% of Y, 0.06-0.1% of Si, not greater than 0.005% of C, not greater than 0.005% of S, not greater than 0.005% of P and Ni of the balance.

Description

A kind of stainless valve trim coating nickel-base alloy silk material
Technical field
The present invention relates to alloy field, particularly a kind of stainless valve trim coating nickel-base alloy silk material.
Background technology
Stainless steel, because having excellent solidity to corrosion and mechanical property, is widely used in the manufacture of various acidproof valve and high-temperature high pressure valve in petrochemical complex, reactor and Nuclear power plants.Because medium various in operational process has stronger corrodibility even radioactivity, valve sealing face frequently stands friction, extruding and effect of impact in opening-closing process simultaneously, the trim of valve is easy to be destroyed, and greatly shorten the work-ing life of valve, and the seepage of medium may cause stop work and production, environmental pollution even to cause the generation of serious accident.Therefore, the trim of stainless valve not only requires to have good erosion resistance, and has high hardness, anti-scuffing function and thermal shock resistance and anti-collision performance.
The trim of stainless valve generally adopts the technique of directly carrying out electric arc, flame spurt welding and plasma surfacing high performance alloys layer on valve body to strengthen, alloy raw material used is mainly Fe base, Ni base and Co base self-fluxing alloy powder, these self-fluxing alloy powders are on the basis of matrix element, add Cr, B, Si, C, Mo, elements such as w, the fusing point of powdered alloy is low, self-fluxing nature is good, has the performances such as anti-corrosion, wear-resisting, heat-resisting, anti-oxidant.And the composition of some application scenario to trim strengthening layer has strict requirement, as nuclear valve considers the long-term reliability in valve work-ing life, trim made by normal employing cobalt base alloy, but cobalt can cause secondary emission because of neutron irradiation, and is unfavorable for reactor work; B has very strong neutron absorption capability, easily produces radiation embrittlement and swelling effect.Stellite company develops not containing the Tribaloy T-700 alloy of B, and its composition is (wt.%): Fe≤3.0, Mo:32.5, Cr:15.5, Si:3.4, Co:1.5, C≤0.08, Ni: surplus.
Similar with existing electric arc, flame spurt welding and plasma surfacing technique, laser melting and coating technique is by the cladding material of high power laser light fusing synchronous transport, matrix surface skim melts simultaneously, utilizes the cooling effect of matrix self to obtain with matrix in conjunction with good alloy layer at matrix surface.Laser melting coating has following features and advantage compared with above-mentioned Technology: 1. can realize high-precision cladding and deposit, material use efficiency is high; 2. the thickness of cladding layer and width reliably control by the cladding of multilayer multi-track overlapping; 3. concentration of energy, little to the heat input of matrix, the thinning ratio of cladding layer is low, little with distortion to the heat affecting of matrix; 4. cladding alloy strengthening layer and matrix are metallurgical binding completely, and bonding strength is high; 5. laser cladding process is a rapid solidification, and the tissue of cladding layer is completely fine and close, pore-free, has higher hardness and wear and corrosion behavior.
At present for the main powder feeding method adopting preset cobalt-based and Co-based alloy powder of stainless valve trim laser melting coating strengthening.Powder pre-setting method is generally only suitable at material surface cladding layer of material, and the thickness of cladding layer is restricted, and powder, as laid too thick, is difficult to during cladding ensure the metallurgical binding of coating and matrix and good coating performance; Powder pre-setting method is when carrying out the thicker alloy layer of multilayer cladding preparation, and can not ensure the continuity of cladding process, technique is comparatively loaded down with trivial details; Found through experiments, when laser melting coating Tribaloy T-700 alloy, because the toughness of alloy layer is poor, cladding layer very easily ftractures; In addition, containing Co or B in Tribaloy T-700 alloy and above-mentioned cobalt-based and nickel-base alloy, can not meet some nuclear valve door sealing surface strengthening layer can not strict demand containing B and Co.
Publication number is the nickel-base alloy that the Chinese patent application of CN101368239A discloses a kind of stainless valve trim alloy layer, the composition of this nickel-base alloy and content are: C:1.0-1.5wt%, Cr:17.5-19.5wt%, Mo:7.0-9.0wt%, W:3.5-4.5wt%, Nb:1.5-2.5wt%, Si:2.0-3.0wt%, Ni: surplus.Not containing B and Co in described Co-based alloy powder composition.The alloy of this patent application overcomes the defect of prior art to a certain extent, but it mainly focuses on the melting and coating process performance of alloy, and the over-all properties of alloy self is not still very good.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to provide a kind of stainless valve trim coating nickel-base alloy silk material, this nickel-base alloy silk material not only has good thermospray or laser melting and coating process performance, the coating adopting it to prepare also has good tensile strength, the corrosion resistance of the mechanical properties such as suitable hardness and excellence, and get togather with matrix metallurgical junction, thermal shock resistance is excellent.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 14.0-16.0%, Cr 22.5-24.5%, W 5.5-6.5%, Ti 1.0-1.5%, Nb 0.8-1.2%, Mn 0.8-1.2%, Y 0.05-0.1%, Si 0.06-0.1%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Preferably, described nickel-base alloy is made up of following component by weight percentage: Mo 14.5-15.5%, Cr 23.0-24.0%, W 5.8-6.2%, Ti 1.2-1.3%, Nb 0.9-1.1%, Mn 0.9-1.1%, Y 0.07-0.08%, Si 0.07-0.09%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Most preferably, described nickel-base alloy is made up of following component by weight percentage: Mo 15.0%, Cr 23.5%, W 6.0%, Ti 1.25%, Nb 1.0%, Mn 1.0%, Y 0.075%, Si0.08%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
The effect of above-mentioned each element and proportioning are according to as follows:
Ni, as matrix element, forms stable austenite tissue, the more alloying element of solid solution;
W, Mo are conducive to the reduction of the Ni base alloy coefficient of expansion, and put forward heavy alloyed high-temperature behavior;
Cr puies forward heavy alloyed high-temperature oxidation resistance and structure stability, and forms the strengthening phase Ni2 (Mo, Cr) of small and dispersed with Mo, Ni, puies forward heavy alloyed mechanical property;
Ti, Nb put forward heavy alloyed mechanical behavior under high temperature, carry heavy alloyed antioxidant property simultaneously;
Mn, Si keep the processing characteristics that alloy is good;
The appropriate interpolation of Y rare earth element can improve alloy purity, improve alloy crystal boundary structure, plays the Microalloying Effect of strengthening crystal boundary.
The present invention has following beneficial effect:
(1) the present invention is by adjusting composition and the content of alloying element, makes each component reach coordination technique effect.On the basis of lot of experiments, determine the content of above-mentioned each component, make its comprehensive action effect optimum, meet the user demand of stainless valve trim coating.
(2) alloy that prepared by the present invention has good tensile strength, the corrosion resistance of the mechanical properties such as suitable hardness and excellence, get togather, and thermal expansivity is low with matrix metallurgical junction, and therefore thermal shock resistance is excellent.
Embodiment
Embodiment one
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 14.0%, Cr 24.5%, W 5.5%, Ti 1.5%, Nb 0.8%, Mn 1.2%, Y 0.05%, Si 0.1%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Embodiment two
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 16.0%, Cr 22.5%, W 6.5%, Ti 1.0%, Nb 1.2%, Mn 0.8%, Y 0.1%, Si 0.06%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Embodiment three
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 14.5%, Cr 24.0%, W 5.8%, Ti 1.3%, Nb 0.9%, Mn 1.1%, Y 0.07%, Si 0.09%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Embodiment four
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 15.5%, Cr 23.0%, W 6.2%, Ti 1.2%, Nb 1.1%, Mn 0.9%, Y 0.08%, Si 0.07%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Embodiment five
A kind of stainless valve trim coating nickel-base alloy silk material, described nickel-base alloy is made up of following component by weight percentage: Mo 15.0%, Cr 23.5%, W 6.0%, Ti 1.3%, Nb 1.0%, Mn 1.0%, Y 0.07%, Si 0.08%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.

Claims (1)

1. a stainless valve trim coating nickel-base alloy silk material, it is characterized in that, described nickel-base alloy is made up of following component by weight percentage: Mo 15.0%, Cr 23.5%, W 6.0%, Ti 1.25%, Nb 1.0%, Mn 1.0%, Y 0.075%, Si 0.08%, C≤0.005%, S≤0.005%, P≤0.005%, remaining is Ni; Cr puies forward heavy alloyed high-temperature oxidation resistance and structure stability, and forms the strengthening phase Ni of small and dispersed with Mo, Ni 2(Mo, Cr).
CN201210305856.0A 2012-08-24 2012-08-24 Nickel-based alloy wire material used for coating layer of sealing surface of stainless steel valve Expired - Fee Related CN102808110B (en)

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Publication number Priority date Publication date Assignee Title
CN101087894A (en) * 2004-12-23 2007-12-12 西门子公司 A Ni based alloy, a component, a gas turbine arrangement and use of pd in connection with such an alloy

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101087894A (en) * 2004-12-23 2007-12-12 西门子公司 A Ni based alloy, a component, a gas turbine arrangement and use of pd in connection with such an alloy

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