RU2675432C1 - Facilitated cemented carbide for contact with components flow - Google Patents

Abstract

FIELD: construction materials.SUBSTANCE: group of inventions relates to cemented carbide for a component subjected to the pressure of a fluid. According to option 1, cemented carbide contains Co, Ni, TiC, Mo, WC and CrC. According to option 2, cemented carbide contains TiC, Co, Ni, Mo, WC and CrC. According to option 3, cemented carbide contains TiC, Ni, Mo, WC and CrC.EFFECT: increased component life.28 cl, 8 dwg, 4 ex, 3 tbl

Description

FIELD OF THE INVENTION / INDUSTRIAL APPLICABILITY

The present disclosure relates to cemented carbides for components in contact with the flow, and more particularly to a flow control device, components designed to operate with a fluid, and o-rings with improved service life.

BACKGROUND

O-rings are a key critical component in mechanical shaft seals for pumps. Cemented carbides have good mechanical properties in this application. However, energy consumption and corrosion resistance are a problem in pumps. If the weight of the cemented carbide o-ring can be reduced, then it is also possible to reduce energy consumption. Reducing weight will also reduce the cost of o-rings and, in turn, the cost of the pump.

One of the most important properties for o-rings is corrosion resistance. During pump operation, the seal surface will be exposed to a pumped medium, which can often be corrosive. Corrosion during the life of the o-ring will lead to the dissolution of the binder. This will lead to increased wear of the o-ring. This in turn will cause a significant increase in fluid leakage from the pump. Thus, there is a need for a corrosion resistant cheaper tungsten carbide o-ring.

Similarly, cemented carbide flow components, the main function of which is to control the pressure and flow of well products used, for example, in the oil and gas industry, where the components are exposed to high pressures of various fluids and where a corrosive environment is present.

Lightweight cemented carbide for improved tin can life is disclosed in patent document EP2439294B1, owned by the patentee of the present disclosure. This cemented carbide has a solid phase containing WC and a binder phase, the cemented carbide composition containing from 50 wt.% To less than 70 wt.% WC, from 15 wt.% To 30 wt.% TiC, and from 12 wt. % to 20% by weight of Co + Ni.

SUMMARY OF THE INVENTION

One aspect of the present invention provides cemented carbide for an extended flow control component.

Another aspect of the present invention provides lightweight cemented carbide for fluid components and an o-ring having improved corrosion resistance.

Therefore, the present invention relates to a cemented carbide for a flow control component in order to control the pressure and flow of well products containing from about 7 wt.% To about 9 wt.% Co; from about 5 wt.% to about 7 wt.% Ni; from about 19 wt.% to about 24 wt.% TiC; from about 1.5 wt.% to about 2.5 wt.% Cr ₃ C ₂ ; and from about 0.1 wt.% to about 0.3 wt.% Mo; as well as the rest of the WC.

In one embodiment, the cemented carbide composition (composition), as defined above or below, has an average grain size of 0.80 μm, measured using FSSS (Fisher Sub Sieve Sizer). In one embodiment, the cemented carbide composition, defined above or below, contains from about 20 to about 22 wt.% TiC, for example, about 21 wt.% TiC.

In one embodiment, the cemented carbide composition, defined above or below, contains from about 1.8 to about 2.2 wt.% Cr ₃ C ₂ , for example, about 2 wt.% Cr ₃ C ₂ .

In one embodiment, the cemented carbide composition, defined above or below, contains from about 5.3 to about 6.0 wt.% Ni, for example, about 5.7 wt.% Ni.

In one embodiment, the cemented carbide composition defined above or below contains from about 8.0 to about 8.6 wt.% Co, for example, about 8.3 wt.% Co.

In one embodiment, the cemented carbide composition, as defined above or below, contains from about 0.15 to about 0.25 wt.% Mo, for example, about 0.2 wt.% Mo.

In one embodiment, the cemented carbide composition, as defined above or below, has a density of from about 9.6 to about 10.2 g / cm ³ , for example from about 9.8 to about 10 g / cm ³ .

In one embodiment, the cemented carbide composition, defined above or below, has a hardness of from about 1350 to about 1500 HV30.

In one embodiment, the cemented carbide composition defined above or below has an impact strength of from about 8.5 to 9.5 MPa МП√m.

In one embodiment, the cemented carbide composition, as defined above or below, contains a residue from WC, for example from 50 wt.% To about 69 wt.%.

The present invention also relates to a second cemented carbide for components intended for use with fluids and an o-ring containing from about 15 wt.% To about 30 wt.% TiC; from about 12 wt.% to about 20 wt.% Co + Ni; from about 0.5 wt.% to about 2.5 wt.% Cr ₃ C ₂ ; and from about 0.1 wt.% to about 0.3 wt.% Mo, as well as the rest of the WC.

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 19.8 to about 21.8 wt.% TiC, for example, about 20.8 wt.% TiC.

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 1.8 to about 2.2 wt.% Cr ₃ C ₂ , for example, about 2 wt.% Cr ₃ C ₂ .

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 5.3 to about 5.9 wt.% Ni, for example, about 5.6 wt.% Ni.

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 7.9 to about 8.5 wt.% Co, for example, about 8.2 wt.% Co.

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 0.15 to about 0.25 wt.% Mo, for example, about 0.2 wt.% Mo.

In one embodiment, the composition of the second cemented carbide, as defined above or below, contains from about 62.2 to about 64.2 wt.% WC, for example, about 63.2 wt.% WC.

In one embodiment, the composition of the second cemented carbide, as defined above or below, has a density of from about 9.6 to about 10.2 g / cm ³ , for example from about 9.8 to about 10 g / cm ³ .

In one embodiment, the composition of the second cemented carbide, as defined above or below, has a hardness of from about 1350 to about 1500 HV30.

In one embodiment, the composition of the second cemented carbide, as defined above or below, has an impact strength of from about 8.5 to 9.5 MPa⋅√m.

In one embodiment, the composition of the second cemented carbide has an average grain size of from about 4 to about 8 microns.

The present invention also relates to a third cemented carbide for components designed to work with fluids, and an o-ring containing from about 15 wt.% To about 30 wt.% TiC; from about 5 wt.% to about 20 wt.% Ni; from about 0.5 wt.% to about 2.5 wt.% Cr ₃ C ₂ ; and from about 0.5 wt.% to about 2.5 wt.% Mo, as well as the rest of the WC.

In one embodiment, the composition of the third cemented carbide, as defined above or below, contains from about 20 to about 23 wt.% TiC, for example from about 20 wt.% To about 22 wt.% TiC.

In one embodiment, the composition of the third cemented carbide, as defined above or below, contains from about 0.8 to about 1.5 wt.% Cr ₃ C ₂ , for example from about 0.95 wt.% To about 1.3 wt.% Cr ₃ C ₂ .

In one embodiment, the composition of the third cemented carbide, as defined above or below, contains from about 9.5 to about 14.5 wt.% Ni, for example from about 10 wt.% To about 14 wt.% Ni.

In one embodiment, the composition of the third cemented carbide, as defined above or below, contains from about 0.7 to about 1.6 wt.% Mo, for example from about 0.95 wt.% To about 1.3 wt.% Mo.

In one embodiment, the composition of the third cemented carbide, as defined above or below, contains from about 62 to about 66 wt.% WC. In one embodiment, the composition of the third cemented carbide, as defined above or below, has a density of from about 9.8 to about 10.4 g / cm ³ , for example from about 10.02 to about 10.2 g / cm ³ .

In one embodiment, the composition of the third cemented carbide, as defined above or below, has a hardness of from about 1390 to about 1550 HV30.

In one embodiment, the composition of the third cemented carbide, as defined above or below, has an impact strength of from about 8.5 to about 9.3 MPa⋅√m.

In one embodiment, the composition of the third cemented carbide, as defined above or below, has an average WC grain size of from about 9.9 microns to about 1.3 microns, for example from about 1.05 microns to about 1.15 microns, measured using FSSS . The previous section, as well as the following detailed description of embodiments, will be better understood when read along with the attached drawings. It should be understood that the illustrated embodiments are not limited to the arrangements and means shown.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an optical microscope image of one embodiment of the present disclosure of cemented carbide for a flow control device and a seal ring.

FIG. 2 is a scanning electron microscope (SEM) image of an embodiment illustrated in FIG. one.

FIG. 3 is an SEM image of another embodiment illustrated in FIG. one.

FIG. 4 is an SEM image of one comparative example.

FIG. 5 is an SEM image of one embodiment of cemented carbide for an o-ring.

FIG. 6 is an SEM image of another embodiment of cemented carbide for an o-ring.

FIG. 7 is an SEM image of another embodiment of cemented carbide for an o-ring.

FIG. 8 is an SEM image of another embodiment of cemented carbide for an o-ring.

DETAILED DESCRIPTION OF THE INVENTION

As used herein, the term “approximately” means plus or minus 10% of the numerical value of the number with which it is used. Therefore, approximately 50% means in the range of 45% to 55%.

As will be fully described herein, embodiments of the present invention relate to cemented carbides for components in contact with the flow (in this document, the term “component” means parts or parts), in particular for o-rings and for throttle components used in oil and gas industries where components are exposed to high pressures of various fluids and where a corrosive environment is present, in particular for throttle components dampers, the main function of which is to control the pressure and flow of well products, such as pumps. In harsh multi-threaded environments, these components can suffer from severe mass loss due to erosion by solid particles, synergy of acid corrosion and erosion corrosion, as well as cavitation mechanisms even when they are made of cemented carbide. These components also suffer from electrochemical corrosion due to the difference in electrical potentials between the binder and the body of the flow control part.

Lightweight cementitious material can also be used, for example, in o-rings in order to reduce the weight of the o-ring. In order to improve the corrosion resistance, the lightweight cemented carbide of the present invention may have a Ni-Cr-Mo binder.

One embodiment of lightweight cemented carbide for use in contact with the stream components, such as o-rings, has a composition of from about 15 wt.% To about 30 wt.% TiC; from about 12 wt.% to about 20 wt.% Co + Ni; from about 0.5 wt.% to about 2.5 wt.% Cr; and from about 0.1 wt.% to about 0.3 wt.% Mo, as well as the rest of the WC. WC may have an average sintered grain size of approximately 0.5 microns. The sintered structure is also shown in FIG. 1 and FIG. 2.

O-rings are a key critical component in mechanical shaft seals for pumps. Cemented carbide has good mechanical properties in this application. The cemented carbide o-rings of the present invention have a reduced weight and therefore reduce energy consumption. In addition, cemented carbide o-rings have improved application-related properties, such as improved corrosion resistance.

In FIG. 1, the first cemented carbide for a component in contact with the stream, LW, defined above or below and used, for example, in a flow control device, has the following composition ranges: from about 7 to about 9 wt.% Co, from about 5 to about 7 wt.% Ni, from about 19 to about 24 wt.% TiC, from about 1.5 to about 2.5 wt.% Cr ₃ C ₂ , from about 0.1 to about 0.3 wt.% Mo, and also the rest is WC.

The hardness of the cemented carbide component, as defined above or below, can be from about 1350 to about 1500 HV30 (in accordance with ISO 3878), impact strength (KIc) can be from about 8.5 to about 9.5 MPa⋅√ m when determined by the indentation method in accordance with KIc (SEVNB)> 8.5 MPa⋅√m and transverse fracture resistance (TRS) in accordance with ISO 3327 type C> 1700 N / mm ² .

WC in the first, second or third cemented carbide may have an average sintered grain size of approximately 0.8 μm, and (Ti, W) C (titanium-tungsten carbide) in the first, second or third cemented carbide may have an average sintered grain size of approximately 1 , 5 microns in accordance with the standard ISO 4499-2-2010.

The carbon content within the sintered cemented carbide, as defined above or below, must be maintained in a narrow range in order to maintain high corrosion and wear resistance, and also have a high impact strength. The carbon level in the sintered structure is maintained in the lower part of the range between free carbon in the microstructure (upper limit) and the onset of the formation of the eta phase (lower limit).

The measurements of magnetic saturation for the magnetic phase of the binder of the sintered cemented carbide are expressed in terms of µTlm ³ / kg, and relate to the nature of the combined multi-element binder. For sintered material in accordance with the present invention, it should be from 80% to 90% of the biphasic binder region. Eta phase or graphite is not allowed in the sintered structure. The sintered structure is shown in FIG. one.

The repeated passivity of the embodiment depicted as LW is improved by significantly adding the solid phase of TiWC to the composition. Corrosion resistance was determined using ASTM G61. ASTM G61 describes a procedure for conducting potentiodynamic polarization measurements. See Table 1 below for ASTM G61 measurement results comparing one embodiment with a comparative example.

Table 1: Parameters estimated from polarization curves in accordance with ASTM G61

Product Eb 10 μm / cm ² Eb 100 μm / cm ² Ereprass 10 μm / cm ² Comparative example 24 46 -333 Lw 118 156 -76

“Eb” means the breakdown potential at which local corrosion occurs and is evaluated according to two different criteria. A lower criterion of 10 μA / cm ² is considered to reflect the ease of initiation of corrosion. The difference between this and a higher criterion of 100 μA / cm ² reflects the propagation process.

"Erepass" represents the potential required for re-passivation of the sample.

Conventional powder metallurgy methods, such as grinding, drying, pressing, molding, sintering and hot isostatic pressing, which are used to make conventional cemented carbides, are used to produce embodiments of the present invention.

EXAMPLES

It should be borne in mind that the following examples are illustrative and non-limiting. Compositions and results of embodiments are shown in Tables 2 and 3 below.

In the examples below, powders were obtained from the following suppliers: (W, Ti) C from Zhuzhou or HC Starck, Co from Umicore or Freeport, Ni from Inco, Mo from HC Starck and Cr ₃ C ₂ from Zhuzhou or HC Starck

Example 1 ("LW flow control" - link A)

Varieties of cemented carbide with a composition of 21 wt.% TiC; 8.3 wt.% Co; 5.7 wt.% Ni; 0.2 wt.% Mo and 2 wt.% Cr ₃ C ₂ with the remainder of the WC were produced using WC powder and (Ti, W) C with an average particle size of FSSS (d ₅₀ ) of 0.8 μm and approximately 3 microns, respectively. Cemented carbide samples were prepared from powders forming solid components and powders forming a binder. These powders were wet milled together with a lubricant and anticoagulant until a homogeneous mixture was obtained, and were granulated by drying. The dried powder was pressed on a Tox press into preforms that were pre-machined before sintering. Sintering was carried out at a temperature of 1360 to 1410 ° C for approximately 1 hour in vacuum, after which a high pressure of 50 bar of argon was applied at a sintering temperature of approximately 30 minutes in order to obtain a dense structure before cooling.

The structure of the sintered cemented carbide contains a certain amount of hexagonal WC with an average grain size of 0.8 μm together with grains (Ti, W) C with an average grain size of 1.5 μm, measured using the secant method.

This material has a hardness of from about 1350 to about 1500 HV30, depending on the selected composition and sintering temperature.

As shown in FIG. 3, an embodiment of the first cemented carbide LW shows improved wear resistance in a scratch test compared to a comparative example of a fine-grained oil and gas grade with 10.5 wt.% Binder (FIG. 4) with similar hardness values. Testing was carried out using a diamond cutter with a tip radius of 20 μm with a force of 200 mN.

The scratch wear resistance is significantly improved for the LW embodiment of the present invention, as shown by the reduced gray amorphous damage in FIG. 3 in comparison with the comparative example shown in FIG. 4. In addition, the corrosion resistance for the embodiment of the present invention LW in seawater is improved with better repeated passivity (see Table 1).

The hardness of the cemented carbide component can be from about 1350 to about 1500 HV30 (in accordance with ISO 3878), impact strength (KIc) of about 8.7 MPa⋅√m using Palmquist impact strength methods in accordance with ISO 28079 or KIc (LW15, SEVNB)> 8.5 MPa⋅√m and transverse fracture resistance (TRS) in accordance with ISO 3327 Type C> 1700 N / mm ² .

Example 2 ("O-ring LW" - reference B)

Varieties of cemented carbide with compositions of approximately 63.2 wt.% WC; approximately 20.8 wt.% TiC; about 2 wt.% Cr ₃ C ₂ ; approximately 8.2 wt.% Co; approximately 5.6 wt.% Ni and approximately 0.2 wt.% Mo were produced using WC powder with an average grain size of FSSS (d ₅₀ ) of 4-8 μm, respectively. The sintered structure is shown in FIG. 5.

Cemented carbide samples were prepared from powders forming solid components and powders forming a binder. These powders were wet milled together with a lubricant and anticoagulant until a homogeneous mixture was obtained, and were granulated by drying. The dried powder was pressed on a Tox press into preforms that were pre-machined before sintering. Sintering was carried out at a temperature of 1360 to 1410 ° C for approximately 1 hour in vacuum, after which a high pressure of 50 bar of argon was applied at a sintering temperature of approximately 30 minutes in order to obtain a dense structure before cooling.

Another embodiment of the lightweight cemented carbide for o-rings in accordance with the present invention, (LW + CR), has a composition of from about 15 to about 30 wt.% TiC, from about 5 to about 20 wt.% Ni, from about 0.5 to about 2.5 wt.% Cr, and from about 0.5 to about 2.5 wt.% Mo, as well as the rest of WC.

Example 3 ("O-ring LW + CR" - link C)

Varieties of cemented carbide with compositions of approximately 66.04 wt.% WC; approximately 21.95 wt.% TiC; approximately 0.95 wt.% Cr ₃ C ₂ ; approximately 0.95 wt.% Mo; approximately 10.11 wt.% Ni were produced using WC and (Ti, W) C powder with an average grain size according to FSSS (d ₅₀ ) greater than about 1 μm, for example 1.1 and 1.15 μm, respectively . It will be appreciated that particle sizes up to about 8 microns can be used.

The sintered structure is shown in FIG. 6.

Cemented carbide samples were prepared from powders forming solid components and powders forming a binder. These powders were wet milled together with a lubricant and anticoagulant until a homogeneous mixture was obtained, and were granulated by drying. The dried powder was pressed on a Tox press into preforms that were pre-machined before sintering. Sintering was carried out at a temperature of 1360 to 1410 ° C for approximately 1 hour in vacuum, after which a high pressure of 50 bar of argon was applied at a sintering temperature of approximately 30 minutes in order to obtain a dense structure before cooling.

The hardness of the cemented carbide component can be approximately 1,550 HV30 (in accordance with ISO 3878), impact strength (KIc) of approximately 8.5 MPa⋅√m using Palmquist impact strength methods in accordance with ISO 28079, and density of approximately 10.2 g / cm ³ .

Example 4 ("O-ring LW + CR" - reference D)

Varieties of cemented carbide with compositions of approximately 62.79 wt.% WC; approximately 20.86 wt.% TiC; approximately 1.29 wt.% Cr ₃ C ₂ ; approximately 1.29 wt.% Mo; approximately 13.78 wt.% Ni were produced using WC and (Ti, W) C powder with an average grain size according to FSSS (d ₅₀ ) greater than about 1 μm, for example 1.1 and 1.15 μm, respectively . It will be appreciated that particle sizes up to about 8 microns can be used.

Cemented carbide samples were prepared from powders forming solid components and powders forming a binder. These powders were wet milled together with a lubricant and anticoagulant until a homogeneous mixture was obtained, and were granulated by drying. The dried powder was pressed on a Tox press into preforms that were pre-machined before sintering. Sintering was carried out at a temperature of 1360 to 1410 ° C for approximately 1 hour in vacuum, after which a high pressure of 50 bar of argon was applied at a sintering temperature of approximately 30 minutes in order to obtain a dense structure before cooling.

The sintered structure is shown in FIG. 7 and FIG. 8.

The hardness of the cemented carbide component can be from about 1390 to about 1400 HV30 (in accordance with ISO 3878), impact strength (KIc) can be from about 8.6 to about 9.3 MPa⋅√m when determined using the Palmquist technique in accordance with ISO 28079, and the density may be from about 10.02 to about 10.17 g / cm ³ .

The grades disclosed herein exhibit improved corrosion resistance compared to a standard grade for an o-ring. Corrosion resistance was determined using a modified ASTM G61 test. ASTM G61 describes a procedure for conducting potentiodynamic polarization measurements. The modification of this standard was in the environments used. Instead of using a 3.5% NaCl solution in tests, artificial seawater was used as the medium in accordance with ASTM D1141. In addition, the washed port cell used in ASTM G61 was replaced by sealing the sample with epoxy to avoid crevice corrosion at the edge of the sample.

Pitting potential was used as a measure for comparison. The higher its value, the better the corrosion resistance of the material. The value measured for the standard grade for o-ring was Epit = 263 mV using a saturated calomel electrode (SCE). However, for grade LW, an Epit value of 318 mV indicates improved corrosion resistance.

table 2

Link A B C D Sample LW flow control O-ring LW o-ring LW + CR o-ring LW + CR WC (wt.%) balance 63,2 66.04 62.79 WC grain size (μm) 0.8 4.0-8.0 1.05-1.15 1.05-1.15 TiC (wt.%) 21 20.8 21.95 20.86 Co (wt.%) 8.3 8.2 0 0 Ni (wt.%) 5.7 5,6 10.11 13.78 Mo (wt.%) 0.2 0.2 0.95 1.29 Cr ₃ C ₂ (wt.%) 2 2 0.95 1.29

Table 3

Link A C D Sample LW flow control o-ring LW + CR o-ring LW + CR Density (g / cm ³ ) 9.8-10 10,2 10.02-10.17 Hardness (Hv30) 1350-1500 1550 1390-1400 Rigidity (K1 _C ) 9.5 8.5-9.5 8.6-9.3

Numbered list of embodiments:

1. Cemented carbide for being in contact with the flow of a component designed to control the pressure and flow of well products, having a composition in wt.%:

balanced WC;

from 7% to 9% Co;

5% to 7% Ni;

from 19% to 24% TiC;

from 1.5% to 2.5% Cr ₃ C ₂ ; and

from 0.1% to 0.3% Mo.

2. Cemented carbide for being in contact with the stream component according to claim 1, in which the composition contains WC in an amount of from 50 wt.% To 69 wt.%.

3. Cemented carbide for being in contact with the stream component according to claim 1 or 2, in which the composition contains 21 wt.% TiC.

4. Cemented carbide for being in contact with the stream component according to any one of the preceding claims., In which the composition contains 2 wt.% Cr ₃ C ₂ .

5. Cemented carbide for being in contact with the stream component according to any one of the preceding claims., In which the composition contains 5.7 wt.% Ni.

6. Cemented carbide for being in contact with the stream component according to any one of the preceding claims., In which the composition contains 8.3 wt.% Co.

7. Cemented carbide for being in contact with the stream component according to any one of the preceding claims., In which the composition contains 0.2 wt.% Mo.

8. Cemented carbide for a component in contact with the stream according to any one of the preceding claims, which has a density of 9.8 to 10 g / cm ³ , hardness of 1350 to 1550 HV30 and impact strength of 9.5 MPa⋅√m.

9. Cemented carbide for a component in contact with the stream according to any one of the preceding claims, which has an average WC grain size of approximately 0.8 μm.

10. Cemented carbide for a sealing ring having a composition containing, in wt.%:

balanced WC;

15% to 30% TiC;

from 2% to 20% Co + Ni;

from 0.5% to 2.5% Cr ₃ C ₂ ; and

from 0.1% to 0.3% Mo.

11. Cemented carbide for components designed to work with fluids and o-rings according to claim 10, in which the composition contains WC in an amount of 63.2 wt.%.

12. Cemented carbide for components designed to work with fluids and o-rings according to claim 10 or 11, in which the composition contains 20.8 wt.% TiC.

13. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-12, in which the composition contains 2 wt.% Cr ₃ C ₂ .

14. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-13, in which the composition contains 5.6 wt.% Ni.

15. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-14, in which the composition contains 8.2 wt.% Co.

16. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-15, in which the composition contains 0.2 wt.% Mo.

17. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-16, which has an average WC grain size of approximately 0.8 microns.

18. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-17, which has a density of 9.8 to 10 g / cm ³ , a hardness of 1350 to 1550 HV30, and an impact strength of approximately 8.7 MPa⋅√m.

19. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 10-16, which has an average WC grain size of from about 4 microns to about 8 microns.

20. Cemented carbide for components designed to work with fluids, and o-rings, having a composition containing, in wt.%:

15% to 30% TiC;

from 5% to 20% Ni;

from 0.5% to 2.5% Cr ₃ C ₂ ;

from 0.5% to 2.5% Mo; and

the rest is WC.

21. Cemented carbide for components designed to work with fluids and o-rings according to claim 20, in which the composition contains WC in an amount of from 62 wt.% To 66 wt.%.

22. Cemented carbide for components designed to work with fluids and o-rings according to claim 20 or 21, in which the composition contains from 20 to 22 wt.% TiC.

23. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 20-22, in which the composition contains from 0.95 wt.% To 1.3 wt.% Cr ₃ C ₂ .

24. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 20-23, in which the composition contains from 10 wt.% To 14 wt.% Ni.

25. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 20-24, in which the composition contains from 0.95 wt.% To 1.3 wt.% Mo.

26. Cemented carbide for components designed to work with fluids, and o-rings according to any one of paragraphs. 20-25, which has a density of 10.02 to 10.2 g / cm ³ , a hardness of 1390 to 1550 HV30, and an impact strength of about 8.5 to about 9.3 MPa⋅√m.

Although the present embodiments have been described with respect to their specific aspects, many other variations and modifications, as well as other uses, will be apparent to those skilled in the art. Therefore, it is preferred that the present embodiment (s) are not limited to the specific disclosure herein, but only by the appended claims.

Claims (30)

1. Cemented carbide for a component subjected to pressure of a fluid, comprising Co, Ni, TiC, Mo and WC, characterized in that it contains Cr ₃ C ₂ in the following components, wt.%: With from about 7 to about 9 Ni from about 5 to about 7 Tic from about 19 to about 24 Cr ₃ C ₂ from about 1.5 to about 2.5 Mo from about 0.1 to about 0.3 WC rest 2. The carbide according to claim 1, in which the composition contains from about 20 to about 22 wt.% TiC. 3. The carbide according to claim 1 or 2, in which the composition contains from about 1.8 to about 2.2 wt.% Cr ₃ C ₂ . 4. The carbide according to claim 1, in which the composition contains from about 5.3 to about 6.0 wt.% Ni. 5. The carbide according to claim 1, in which the composition contains from about 8.0 to about 8.6 wt.% Co. 6. The carbide according to claim 1, in which the composition contains from about 0.15 to about 0.25 wt.% Mo. 7. The carbide according to claim 1, in which the composition contains WC in an amount of from about 50 wt.% To about 69 wt.%. 8. The carbide according to claim 1, which has a density of from about 9.6 to about 10.2 g / cm ³ . 9. The carbide according to claim 1, wherein the component subjected to the pressure of the fluid is a component designed to control the pressure and flow of the well products. 10. Cemented carbide for a component subjected to pressure of a fluid, including TiC, Co, Ni, Mo and WC, characterized in that it contains Cr ₃ C ₂ in the following components, wt.%: Tic from about 15 to about 30 Co + Ni from about 12 to about 20 Cr ₃ C ₂ from about 0.5 to about 2.5 Mo from about 0.1 to about 0.3 WC rest 11. The carbide according to claim 10, containing from about 19.8 to about 21.8 wt.% TiC. 12. The carbide according to claim 10 or 11, containing from about 1.8 to about 2.2 wt.% Cr ₃ C ₂ . 13. The carbide according to claim 10, containing from about 5.3 to about 5.9 wt.% Ni. 14. The carbide according to claim 10, containing from about 7.9 to about 8.5 wt.% Co. 15. The carbide according to claim 10, containing from about 0.15 to about 0.25 wt.% Mo. 16. The carbide according to claim 10, containing WC in an amount of from about 62.2 to about 64.2 wt.%. 17. The carbide according to claim 10, which has a density of from about 9.6 to about 10.2 g / cm ³ . 18. The carbide according to claim 10, which has an average WC grain size of from about 4 microns to about 8 microns. 19. The carbide according to claim 10, in which the component subjected to the pressure of the fluid is a component designed to work with fluids, or an o-ring. 20. Cemented carbide for a component subjected to pressure of a fluid, including TiC, Ni, Mo and WC, characterized in that it contains Cr ₃ C ₂ in the following components, wt.%: Tic from about 15 to about 30 Ni from about 5 to about 20 Cr ₂ C ₃ from about 0.5 to about 2.5 Mo from about 0.5 to about 2.5 WC rest 21. The carbide according to claim 20, containing from about 20 to about 23 wt.% TiC. 22. The carbide according to claim 20 or 21, containing from about 0.8 to about 1.5 wt.% Cr ₃ C ₂ . 23. The carbide according to claim 20, containing from about 9.5 to about 14.5 wt.% Ni. 25. The carbide according to claim 20, containing from about 0.7 to about 1.6 wt.% Mo. 26. The carbide according to claim 20, which has a density of from about 9.8 to about 10.4 g / cm ³ . 27. A carbide according to claim 20, which has an average WC grain size of from about 9.9 microns to about 1.3 microns. 28. The carbide according to claim 20, in which the component subjected to the pressure of the fluid is a component designed to work with fluids, or an o-ring.

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