Method of manufacture of the spindle out of the steel for the pipeline fittings

FIELD: different industries; methods of manufacture of the spindles out of the steel for the pipeline fittings.

SUBSTANCE: the invention is pertaining to the method of manufacture of the pipeline fittings, in particular, the spindles, shutters and valves for shutting and control of consumption off the mediums passing through the pipelines. The method includes the thermal treatment and the mechanical working with formation of the threading. After the mechanical working exercise nitriding by the vacuum ion-implantation method at the temperature of T = (320-450)°С, the voltage - U = (250 - 750)V and during the time t = (20-60) minutes. The technical result consists in the increased reliability and the service life of the pipeline fittings.

EFFECT: the invention ensures the increased reliability and the service life of the pipeline fittings.

3 cl, 1 ex, 2 dwg

 

The invention relates to valves, and particularly to spindles (rods) of the valves and valves for closing and controlling the flow passing in the pipeline environments.

The main requirements for the spindles working in pipelines superheated steam or water are corrosion resistance, wear resistance, heat resistance (up to 600° (C) and fatigue strength in these environments.

In the domestic valve industry for the manufacture of spindles used pearlitic class [Cerestar V.I., Kuznetsov V.A. valves TPP: the Handbook - M.: MPEI, 2001. - 368 S.: ill.; 23 see]: type HM and HA for steam (temperature up to 600°C, pressure up to 40 MPa) and water (environment temperature 20-100° (C) without additional surface treatment. These spindles have low corrosion resistance and wear resistance that the operation does not provide the specified reliability and service life. For spindles, working in conditions of critical temperatures and pressures, in addition applied welding electrodes grades of CR-6, CR-12 [Imbrickiy M.I. Quick reference to pipelines and valves, M.: Energy, 1969]. However, due to the inevitable gas saturation, formation of slag and then this surface in humid environments prone to electrochemical corrosion [Technology electrical svarc the metals and alloys by melting. Ed. by Acad. Beaton. M: mechanical engineering, 1974, 768 S.].

It is known [Cerestar V.I., Kuznetsov V.A. valves TPP: the Handbook - M.: MPEI, 2001. - 368 S.: ill.; 23 see]that foreign manufacturers for the production of spindles use of high-chromium steel, the same steel type 20X13.

Known methods of surface treatment of the spindles by the method of chemical Nickel plating [Cerestar V.I., Kuznetsov V.A. valves TPP: the Handbook - M.: MPEI, 2001. - 368 S.: ill.; 23 see]. The use of this treatment slightly increases the corrosion resistance, but with it, does not provide sufficient wear resistance, which during operation causes premature destruction of the spindle.

For hardening of the spindle using the method of gas welding Stellite cobalt thickness up to 3 mm (company KSB, Germany) [Cerestar V.I., Kuznetsov V.A. valves TPP: the Handbook - M.: MPEI, 2001. - 368 S.: ill.; 23 see]. For spindles working in critical conditions of temperature and pressure, is applied welding electrodes grades of CR-6, CR-12 [Imbrickiy M.I. Quick reference to pipelines and valves. M: Energy, 1969]. These methods lead to the creation of surfaces with heterogeneous structural-phase composition and porosity [Technology electric welding of metals and alloys by melting. Under re is. Acad. Beaton. M: mechanical engineering, 1974, 768 S.]. This can lead to corrosion degradation of such spindle in wet environments, in addition, Stellite cobalt is expensive structural material and its use is not always economically justified.

It is known [RF Patent №2138718, 6 F16K 3/00, 27.09.1999,] that a good corrosion resistance in an environment in which there are at least traces of moisture, provides a method of manufacture of all major parts of the valve for pipelines, including spindle, cases, covers and disc in contact with each other via the working environment of titanium alloy with subsequent machining. The disadvantage of such a method of manufacture of the valve is the high consumption of expensive material that is economically unjustified.

A known method of manufacturing a steel valves with the stem made of titanium alloy [Imbrickiy M.I. Reference fixture thermal power plants. - M.: Energoizdat, 1981]. Corrosion resistance of titanium spindle in the aquatic environment hundreds of times more than steel, which prevents its destruction during the operation.

The disadvantage of this method is the restriction of the use of such valves on one of the main operational characteristics - operating temperature, which reaches 600°C. In this study the Oia heat-resistant titanium alloys show what temperature limit when their short-term operation does not exceed 550°With [Titanium alloys. Heat-resistant titanium alloys. Corned beef OP, Glazunov YEAR M.: metallurgy, 1976, s].

The closest in technical essence of the present invention is a method of manufacturing a spindle of steel, which after machining spend furnace nitriding the surface to increase its hardness [Imbrickiy M.I. Reference fixture thermal power plants. - M.: Energoizdat, 1981].

The disadvantage of this method is that when the furnace nitriding is formed heterophase structure of the surface of the spindle with large nitride inclusions, causing severe wear and corrosion during operation. This diversity patterns in conditions of high temperatures (up to 600° (C) facilitates the diffusion of oxygen along the grain boundaries deep into the material, which leads to embrittlement.

In the presence of water environment sections of material with different electrode potentials form microvasculopathy that leads to the development of local electrochemical corrosion and, as consequence, to decrease in the period of operation of the spindle.

The technical result of the proposed method is to improve the reliability and longer service life of the valve by reducing gas cor is Uzziah spindle superheated steam (temperature up to 600° C)blocking in its surface local electrochemical corrosion processes in the aquatic environment and improve wear resistance.

The technical result is achieved in that in the method of manufacturing a spindle of steel pipe fittings, including heat treatment, machining with the formation of carving, polishing, unlike the prototype of subsequent conduct nitriding vacuum ion-implantation method at a nitrogen pressure P=3.10-3 mm Hg, the process temperature T=(320-450° (C), the voltage U=(250-750), the processing time t=(20-60 min).

The technical result is also achieved by the fact that in the method of manufacturing a spindle of steel pipe fittings, including heat treatment, machining with the formation of carving, polishing, nitriding, unlike the prototype on the surface of the applied layer α-titanium, to make steel passivating properties at the process temperature of T=(350-450° (C), the substrate voltage U=(250-270), the processing time t=(2-7 min).

In addition, the technical result is achieved in that in the method of manufacturing a spindle of steel pipe fittings, including heat treatment, machining with the formation of carving, polishing, nitriding and applying a layer of titanium, unlike the prototype on the surface of the spindle cause casinoenlinea floor, consisting of layers α-titanium, β- and ε-phase titanium nitride 4×(Ti+TiN+Ti2N) thickness 4×[(0,5÷1)+(2÷3)+(2÷3)] mcm at the process temperature T=(400-450° (C), the substrate voltage U=(250-270, the ion current i=(5-10 mA/cm2).

The coating has a hardness of more than 20000 MPa, which ensures its high durability.

Ion-implantation nitriding forms in the surface layer of the spindle thin homogeneous nitride layer that passivates (electrode potential ϕ=+0,12 In) and at the same time strengthens the surface due to the high hardness of the formed nitride and increase the density of dislocations in the base material to a depth of 100 ám. In addition, the formed nitride layer provides good adhesion of subsequent coating applied to the core material.

The subsequent application of a layer of titanium gives the surface of the spindle additional passivation properties, bringing its electrode potential ϕ=+0,22 In to the potential multi-coating ϕ=+0,16 Century

A protective multilayer coating is done on the entire length of the working surface of the spindle, a threaded section, end surfaces and provides cathodic protection to the base material, blocking it local electrochemical corrosion processes. The construction of the layers of coating deposition is seeking so to provide anodic protection of each subsequent layer.

Let us consider possible corrosion processes for the spindle of steel, manufactured according to the proposed method.

1. High-temperature gas corrosion

Applied according to the proposed method, the titanium nitride coating protects the surface of the spindle from the gas corrosion due to the formed homogeneous structure of TiN and education during operation stable oxynitride compounds of TixNyOzresistant to penetrating oxidation.

2. Electrochemical corrosion

Local electrochemical corrosion of the surface of the spindle of steel, manufactured by the proposed method is completely eliminated due to the sequential formation of passive nitrided layer, application layer α-titanium and multilayer protective coating.

Applied multi-layer coating is built on the principle of anodic protection, where each subsequent layer of titanium nitride being less positive on the electrode potential, protects the more positive the previous layer α-titanium, which ensures high reliability of the coating. When potential damage of a separate layer of titanium nitride (pores, mechanical damage) underlying layers of the coating will not only maintain, but increase anodic protection.

The invention poasted the drawings, figure 1 simply shows the spindle for gate valves, figure 2 - schematic model of the surface of the spindle, made in the proposed method, which shows: zone I - protective multilayer coating consisting of layers α-titanium, β- and ε-phase titanium nitride 4×(Ti+TiN+Ti2N), area II - layer α-titanium, zone III - modification of the nitrogen ions and the next zone IV - key material.

A SPECIFIC EXAMPLE of implementation of the METHOD

For the manufacture of spindle take billet in the form of a rod, which is subjected to the heat treatment for forming the desired structure.

Forming spindle carried out by machining including turning, milling, grinding and shop operations with subsequent control of the given geometrical dimensions.

After final machining, including the formation of a thread, the spindle is placed in a vacuum chamber type HHB-6, which is heated to a temperature of T=(300-350° (C) the energy of the ions. Further, the spindle is subjected to vacuum ion-implantation to the nitriding: nitrogen pressure P=3.10-3 mm Hg, the temperature of the process T=(320-450° (C), the voltage U=(250-750), the processing time t=(20-60 min). After ion-implantation of nitriding is carried out applying a layer of α-titanium. The temperature on the substrate T=(350-450° (C), the substrate voltage U=(50-270) the processing time t=(2-7 min). Then apply several layers of protective coating consisting of layers α-titanium, β- and ε-phase titanium nitride 4×(Ti+TiN-Ti2N), of a thickness of 4×[(0,5÷1)+(2÷3)+(2÷3)] µm (process temperature T=(400-450° (C), the substrate voltage U=(250-270), ion current i=(5-10 mA/cm2}.

After the deposition of multilayer protective coating spindle cooled in a vacuum chamber to a temperature not less than 100°C.

Ion-implantation nitriding followed by applying a layer of titanium and a protective multilayer coating is carried out in one vacuum volume.

After processing, the spindle wipe with a soft cloth and Packed.

Thus, manufacture of the spindle of steel on the proposed method provides improved reliability and increased service life of valves by reducing the high-temperature chemical corrosion spindle superheated steam (temperature up to 600° (C) and block local electrochemical corrosion processes in the surface of the spindle in the aquatic environment.

1. A method of manufacturing a spindle of steel pipe fittings, including heat treatment and mechanical processing with the formation of the thread, wherein after machining carry out nitriding vacuum ion-implantation method is when the temperature T=(320-450)° C, voltage U=(250-750)and during the time t=(20-60) minutes

2. The method according to claim 1, characterized in that after nitriding on the surface of the applied layer α-titanium to make steel passivating properties at the process temperature of T=(350-450)°C, the substrate voltage U=(250-270)and processing time t=(2-7) minutes

3. The method according to claim 2, characterized in that after applying a layer α-titanium cause the protective multilayer coating consisting of four multiple duplicate layers α-titanium, β- and ε-phase of titanium nitride with a thickness of each layer α-titanium (0.5 to 1 microns), β-phase of titanium nitride (2-3 microns) and ε-phase of titanium nitride (2-3 microns) at a temperature T=(400-450)°With, the voltage U=(250-270)and ion current i=(5-10) mA/cm2.



 

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18 cl, 3 dwg, 1 ex

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1 tbl

FIELD: deposition of wear-resistant coatings onto cutting tools, possibly in metal working industry branches.

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2 cl, 1 tbl, 1 ex

FIELD: application of wear-resistant coatings onto cutting tools, possibly in metal working industry branches.

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2 cl, 1 tbl, 1 ex

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5 cl, 7 ex

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1 ex, 1 tbl

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EFFECT: improved working capacity of tool, enhanced quality of working by such tool.

1 ex, 1 tbl

FIELD: methods of application of wear-resistant coats on cutting tools; metalworking.

SUBSTANCE: multi-layer coat is applied on working surfaces of cutting tools by vacuum-plasma method. Layers of coat are applied with the aid of three cathodes located horizontally in one plane. Two opposite cathodes are made from titanium and sectional cathode located in between them is made from titanium and aluminum. Lower layer of titanium nitride is applied at temperature of 620°C±10°C and upper layer is made from titanium nitride and aluminum is applied at temperature of 550°C±10°C.

EFFECT: enhanced serviceability of cutting tools; improved quality of treatment.

1 tbl, 1 ex

FIELD: application of multi-layer wear-resistant coats on cutting tools; metalworking.

SUBSTANCE: multi-layer coat is applied on working surfaces of cutting tools by vacuum-plasma method. Layers are applied with the aid of three cathodes located horizontally in one plane. Two opposite cathodes are made from titanium and sectionalized cathode located between them is made from titanium and zirconium. Lower layer containing titanium nitride is applied at temperature of 620°C±10°C and upper layer containing titanium nitride and zirconium is applied at temperature of 550°C±10°C.

EFFECT: increased service life of cutting tools; improved quality of treatment.

1 tbl, 1 ex

FIELD: mineral protection coatings.

SUBSTANCE: invention relates to applying wear-resistant coatings for cutting tools used in metal machining. Method comprises vacuum-plasma deposition of two-layer coating, wherein basic coating is deposited under nitrogen pressure 8·10-4 Pa in interaction chamber and top layer is deposited under nitrogen pressure 4·10-3 Pa. Basic layer is constituted by titanium and aluminum nitrides or titanium and iron nitrides, or titanium and silicon nitrides. Top layer is formed from the same nitride constituents but alloyed with zirconium. In specific embodiments of invention, thickness of basic layer is 25-50% of the total thickness of coating and the latter is 3-9 μm.

EFFECT: increased wear and crack resistance of cutting tools.

2 cl, 1 tbl

FIELD: aircraft industry; natural gas industry; methods and the devices for ionic treatment of the metal articles surface layers.

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EFFECT: the invention ensures the increased efficiency of optimization of the ionic treatment.

5 cl, 3 dwg, 1 tbl, 1 ex

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