CN111996454A - Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting - Google Patents
Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting Download PDFInfo
- Publication number
- CN111996454A CN111996454A CN202010823516.1A CN202010823516A CN111996454A CN 111996454 A CN111996454 A CN 111996454A CN 202010823516 A CN202010823516 A CN 202010823516A CN 111996454 A CN111996454 A CN 111996454A
- Authority
- CN
- China
- Prior art keywords
- casting
- stainless steel
- mechanical seal
- boron
- hardness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides high-hardness and wear-resistant stainless steel for mechanical sealing, which comprises, by mass, 5.0-15.0% of B, Si: 1.0-2.0%, Cr: 13.0 to 25.0%, Ni: 9.5 to 14.5%, Mn: 2.0-5.0%, C: 0.9-3.0%, Cu: 1.5% -4.5%, Mo: 0.25 to 5%, the balance being Fe and unavoidable impurities, and heat treating the steel so that the microstructure of the steel comprises 45 to 75% of austenite under the heat treatment conditions, and the remainder of the microstructure is ferrite. The hardness of the stainless steel can reach 46-58 HRC, the hardness requirement completely meets the standards of ball valves and other high-hardness seals, the hardness required by mechanical sealing elements is completely met, and the stainless steel is 316 stainless steel under the detection of a spectrometer and has better hardness than the existing 316 stainless steel.
Description
Technical Field
The invention belongs to the field of stainless steel production, and particularly relates to a stainless steel material for mechanical sealing and having high hardness and high wear resistance and a preparation method thereof.
Background
At present, the sealing element for ball valve fittings, especially for hard sealing, generally adopts Ni60 to spray weld an iron casting, so that a Ni60 surface layer is formed on the outer surface of the iron casting, and the wear resistance and the hard sealing performance are realized through the Ni60 surface layer. When it has the following disadvantages: first, the inner surface or the inner bend may not be spray welded or not in place; secondly, because the film layer is only formed on the surface, after long-term use, particularly the long-term collision part of the valve, which is generally the inner surface corner part, is worn greatly, the iron inner core is often exposed, the structural deformation occurs, the sealing is affected, the leakage is easy to occur, the serious potential safety hazard is caused, and moreover, the price of Ni60 is expensive, and the manufacturing cost is very high.
The valve fittings are widely used at home and abroad at present as follows: 1. the nickel hard cast iron contains nickel and chromium alloy elements, and the microstructure of the nickel hard cast iron consists of M3C eutectic carbide, primary austenite and transformation products of the eutectic austenite which are in a net shape. The sealing material is commonly called as nickel 1, nickel 2, nickel 3 and nickel 4 internationally, wherein the nickel 4 is high-chromium type nickel hard cast iron containing 5-7% of nickel and 7-11% of chromium, the microhardness HRC is 40-50, the problem of high brittleness exists, the valve seat and the sphere are manufactured, cracks are easy to appear on the surface of the valve seat and the sphere, and therefore the sealing performance of the formed sealing pair cannot meet the requirements of the ball valve, the addition amount of rare metal is large, and the cost is high; 2. the nickel hard cast iron contains nickel and chromium alloy elements, wherein the chromium content is 11-25%, the carbon content is 2-4%, and the ratio of the chromium content to the carbon content exceeds 3.5, so that the nickel hard cast iron has excellent wear resistance and impact toughness, but the hardness and wear resistance of cast iron alloy on the existing market do not meet the requirements of ball valves and valve seats.
In iron-based wear resistant materials, wear resistant hard phases have been found to be mainly of the two main types of carbides and borides. Boron is added into the alloy, boride usually has very high hardness, boron-containing iron-based alloy can form a plurality of boride with high hardness and high wear resistance, such as Fe2B, Fe3(C, B), Fe3(C, B)6, and the boron-containing iron-based alloy has high hardness and better wear resistance. The iron-based wear-resistant material taking carbide as a wear-resistant hard phase is researched more at home and abroad, while the iron-based wear-resistant material taking boride as a wear-resistant hard phase is researched less, and on the surface of the previous research results, if the boron content in the steel material exceeds 0.003%, brittle boride can be formed on a grain boundary, a boron brittleness phenomenon is generated, and the toughness of the material is obviously reduced, so that the traditional concept is formed, boron can cause the material to become brittle, and therefore, the boron content needs to be controlled firstly in production, and then the production process (the temperature and time of heating and cooling are controlled, so that cracks are avoided).
Therefore, it is a continuous effort for those skilled in the art to provide a super stainless steel mechanical sealing material with high hardness and high wear resistance.
Disclosure of Invention
The invention provides the stainless steel for the mechanical seal, which has high hardness, high wear resistance and low cost, the surface of the mechanical seal cast by the stainless steel is smooth and tidy, various defects and problems of surface treatment in a spraying or surfacing process are effectively avoided, and the service life of the seal is greatly prolonged.
In order to solve the technical problems, the invention adopts the following technical scheme: a stainless steel for mechanical seal with high hardness and wear resistance is characterized in that: contains, in mass%, 5.0 to 15.0% of B, Si: 1.0-2.0%, Cr: 13.0 to 25.0%, Ni: 9.5 to 14.5%, Mn: 2.0-5.0%, C: 0.9-3.0%, Cu: 1.5% -4.5%, Mo: 0.25 to 5%, the balance being Fe and unavoidable impurities, and heat treating the steel so that the microstructure of the steel comprises 45 to 75% of austenite under the heat treatment conditions, and the remainder of the microstructure is ferrite.
As an improvement: the alloy consists of the following elements in percentage by mass: 10.0%, Si: 1.5%, Cr: 25.0%, Ni: 9.5%, Mn: 2.5%, C: 0.9%, Cu: 1.5%, Mo: 0.3%, and the balance of Fe and inevitable impurities.
As an improvement: the alloy consists of the following elements in percentage by mass: 5.0%, Si: 1%, Cr: 13.0%, Ni: 14.5%, Mn: 5.0%, C: 1.5%, Cu: 3%, Mo: 4%, and the balance of Fe and inevitable impurities.
A mechanical seal casting using the stainless steel for mechanical seal of the present invention, which is a valve fitting or a seal for hard seal, having high hardness and wear resistance.
A method for producing a mechanical seal casting using the stainless steel for mechanical seal having high hardness and wear resistance of the present invention is characterized by comprising the steps of:
step 1, smelting, namely smelting according to the components of the claim 1;
step 2, heating, and keeping the temperature for 3-5 minutes in an intermediate frequency furnace at 1750-1800 ℃; then cooling to 1650 ℃ and discharging to form austenitic-ferritic stainless steel;
step 3, casting to obtain a casting after discharging;
step 4, quenching treatment, namely heating the casting obtained in the step 3 to 850-950 ℃, preserving heat for 2-6 hours, and then putting the casting into cold water for rapid cooling;
and 5, tempering, namely putting the quenched casting into a heat treatment furnace for tempering, and discharging and cooling when the heating temperature reaches 350-450 ℃.
As an improvement: in step 1, Fe, Mo, Ni, C, Cr, B, Mn, Si, Cu are sequentially added for melting and smelting.
As an improvement: in the step 1, one or more of ferroboron, boron-nickel, boron-chromium, molybdenum boride and boron carbide is used as a raw material for component smelting in the B mode.
The stainless steel for mechanical seal has the following advantages: the hardness of the stainless steel can reach 46-58 HRC, the hardness requirement completely meets the standards of ball valves and other high-hardness seals, the hardness required by mechanical sealing elements is completely met, and the stainless steel is 316 stainless steel under the detection of a spectrometer and has better hardness than the existing 316 stainless steel.
The mechanical sealing element made by the invention has the advantages that the inner and outer parts are cast by the metal piece, the product has consistent inner and outer strength, the strength is higher, the mechanical sealing element is more wear-resistant, the problems that the sealing effect is influenced by structural deformation caused by wear and the like are effectively avoided, and the mechanical sealing element has consistent hardness and wear resistance with the whole body at a fine or bent part. The phenomenon of exposed corrosion of the iron inner core can not occur even if the hard sealing element is used for a long time, and compared with the existing hard sealing element, the hard sealing element manufactured by the invention has longer service life, higher use stability and higher safety. The metal bidirectional structure is more uniform without spraying, and the process flow and the cost are saved; because the inside and outside are consistent, the device has later-stage size adjustability. The dosage of boron is increased, so that the alloy has high temperature and high pressure resistance, and the cost of the material is greatly reduced; can replace the spray welding process of Ni55 or Ni 60.
The dosage of chromium is increased, so that the corrosion resistance of the alloy is increased, and the alloy is more suitable for occasions with humidity and easy corrosion.
Moreover, compared with the existing sealing element, the preparation method of the mechanical seal casting of the stainless steel for mechanical seal with high hardness and wear resistance has the advantages of simpler and more convenient process flow, no need of additional spraying, low processing difficulty, easy realization, high consistency of processed products, high yield and more perfect product yield.
The invention is described in further detail below with reference to the figures and examples.
Drawings
FIG. 1 is a process diagram of the present invention;
FIG. 2 is a mechanical seal cast from stainless steel for mechanical seals having high hardness and wear resistance;
Detailed Description
Example 1
In this embodiment, the stainless steel for mechanical seal with high hardness and wear resistance of the present invention comprises the following specific components in parts by weight: contains, in mass%, 5.0% of B, Si: 1.0%, Cr: 13.0%, Ni: 14.5%, Mn: 5.0%, C: 1.5%, Cu: 3%, Mo: 4% and the balance being Fe and unavoidable impurities, the steel being heat treated so that the microstructure of the steel comprises 45-75% austenite under the heat treatment conditions, the remainder of the microstructure being ferrite.
Sequentially putting the raw materials in the proportion of Fe, Mo, Ni, C, Cr, B, Mn, Si and Cu into a smelting furnace, placing the smelting furnace in a medium-frequency electric furnace for heating and melting, and keeping the temperature for 5 minutes at 1750 +/-2 ℃; then cooling to 1650 ℃, discharging, and pouring the discharged material to obtain a casting; quenching the casting, heating the obtained casting to 850 +/-2 ℃, preserving heat for 2.5 hours, and then putting the casting into cold water for rapid cooling, wherein the stainless steel can reach the maximum plasticity, toughness and corrosivity; and (4) tempering, namely tempering the quenched casting in a heat treatment furnace, and discharging and cooling when the heating temperature reaches 350 +/-2 ℃. The process curve is shown in fig. 1, and the performance analysis of the finished casting obtained is shown in table one.
The addition of chromium, nickel and manganese elements in the alloy material can improve the corrosion resistance of the material, so that the corrosion resistance of the obtained casting is improved, and the alloy is more suitable for a humid environment, thereby being used under special working conditions.
As boron is used as a simple substance to be melted with other raw materials, the prepared alloy material contains a large amount of hypereutectic components, the hardness and the wear resistance of the alloy material are greatly improved, meanwhile, the brittleness problem exists, cracks are easy to appear in the subsequent casting process, and the sealing performance of the valve seat and the ball valve is not good when the valve seat and the ball valve are integrally cast, so that the invention adopts one or more of ferroboron, nickel boron, chromium boron, molybdenum boride and boron carbide as the raw materials for smelting the boron element, and the toughness of the alloy material can be greatly improved without influencing the hardness of the alloy.
In specific implementation, the boron element can be one or more of ferroboron, boron-nickel, boron-chromium, molybdenum boride and boron carbide as a raw material and added into the boron-containing ferrite alloy, and other elements are added into the boron-containing ferrite alloy as a raw material by using a simple substance or a compound or an alloy formed by boron and the other elements. For example, the boron element part is added into the boron-containing ferrite alloy in the form of ferroboron, and the content of ferroboron is 0.3-5.0%; the boron element part is added into the boron-containing ferrite alloy by taking the boron nickel as a raw material, and the content of the boron nickel is 9-15%; the boron element part is added into the boron-containing ferrite alloy in the form of boron and chromium, and the content of the boron and chromium is 0.2-0.5%; the boron element part is added into the boron-containing ferrite alloy in the form of molybdenum boride, wherein the content of the molybdenum boride is 0.2-3.0%; the boron element part is added into the boron-containing ferrite alloy in the form of boron carbide, and the content of the boron carbide is 0.9-3.0%.
Example 2
In this embodiment, the stainless steel for mechanical seal with high hardness and wear resistance of the present invention comprises the following specific components in parts by weight:
10.0% of boron, 2% of boron nickel, 0.3% of boron chromium, 1.2% of boron carbide, 1.5% of silicon and 25.0% of chromium; 9.5 percent of nickel; 2.5 percent of manganese; 0.9% of carbon; 1.5% of copper; 0.3 percent of molybdenum; the balance being Fe and unavoidable impurities.
Firstly, sequentially placing boron, boron nickel, boron chromium and boron carbide in an intermediate frequency electric furnace according to a ratio to preheat to 30-50 ℃, then sequentially adding other components in the electric furnace according to a ratio to heat, and preserving heat for 3 minutes at 1800 +/-2 ℃; then cooling to 1650 ℃ and discharging; pouring the discharged material to obtain a casting; quenching the casting, heating the casting obtained in the step three to 950 +/-2 ℃, preserving the heat for 6 hours, and then putting the casting into cold water for rapid cooling; and (4) tempering, namely tempering the quenched casting in a heat treatment furnace, and discharging and cooling when the heating temperature reaches 450 +/-2 ℃. The analysis of the properties of the finished casting obtained is shown in table one. In the heating process of the raw materials, in order to prevent surface decarburization or carburization, heating is generally carried out in a protective atmosphere or a vacuum furnace, and methanol is preferably used as the protective atmosphere in the protective atmosphere. The depth of the net-shaped carburized layer on the surface is less than 0.15mm, and the depth of the decarburized layer is less than 0.02 mm.
Example 3
In this embodiment, the stainless steel for mechanical seal with high hardness and wear resistance of the present invention comprises the following specific components in parts by weight: 14.0% of boron, 2% of molybdenum boride, 2% of silicon and 20% of chromium; 9.5 percent of nickel; 2.0 percent of manganese; 3.0% of carbon; 2% of copper; 3.5 percent of molybdenum; the balance being iron and unavoidable impurities.
The raw materials in the ratio are placed in a salt bath furnace for heating and melting, and the molten salt solution is used as a heating medium. Firstly, heating the raw materials to 700 ℃, preheating and preserving heat for 1 minute; then heating to 840 deg.C, preheating and holding for one minute to reduce thermal shock caused by rapid heating, heating to 1750 + -2 deg.C to melt the raw materials, and holding for 3 minutes; then cooling to 1650 ℃ and discharging; pouring the discharged material to obtain a casting; quenching the casting, heating the casting obtained in the step three to 900 +/-2 ℃, preserving heat for 4 hours, optionally preserving heat in a salt bath, and then putting the casting into cold water for rapid cooling, so that the hardness and the metallographic structure of the material are further changed, the hardness is improved, simultaneously the residual austenite and ferrite are reduced, and the size is stabilized; and (3) tempering, namely putting the quenched casting into a heat treatment furnace for tempering, keeping the temperature for 2-10 minutes when the heating temperature reaches 400 +/-2 ℃, and discharging and naturally cooling. The analysis of the properties of the finished casting obtained is shown in table one. If the size of the casting is large or the structure is complicated, cracks may be caused by thermal shock when the salt bath is used for heating, and the quality of the casting may be reduced.
Table shows the results of the hardness, sealing properties and abrasion resistance tests of the respective materials and their masses added in examples 1 to 3
The mechanical property analysis in table one shows that the stainless steel for mechanical seal with high hardness and wear resistance has high hardness, high wear resistance and corrosion resistance after quenching on the premise of further reducing the amount of nickel and the content of nickel, and reducing the cost of raw materials. The hardness of the alloy reaches 58HRC, which is higher than that of alloy steel in the prior art, and the alloy with high hardness is suitable for being applied to occasions with high pressure and high heat, in particular to valves (valve bodies, valve seats and valve seals), pump body parts (such as impellers), gears and other occasions requiring high wear resistance and corrosion resistance. In addition, as shown by a tensile test and a yield strength test, the surface deformation rate of the material is low, so that the nodular cast iron mechanical sealing material with high hardness and high wear resistance can be applied to occasions requiring hard sealing and occasions matched with axial transmission.
In the test, a DIL805A phase transformation instrument is adopted to measure the continuous cooling transformation of the undercooled austenite after casting austenitization and the cooling transformation thermal expansion curve after the second phase is precipitated at high temperature, and the hardness and the residual austenite content of the microstructure are measured by observing the microstructure under an optical microscope and a scanning electron microscope. The results show that: along with the increase of the cooling rate of the super-cooled austenite, the hardness of the alloy is increased firstly and then reduced and then increased, the austenite is obviously stabilized when the cooling rate is about 30 ℃/S, the hardness is reduced by the increase of the residual austenite after quenching, the super-cooled austenite is subjected to isothermal test at 800-1000 ℃, carbides and nitrides are precipitated most at the isothermal time of 900 ℃, the stability of the super-cooled austenite is obviously reduced, and the hardness greater than HRC56 is obtained.
As shown in figure 2, the mechanical sealing element cast by the stainless steel for the mechanical sealing with high hardness and wear resistance has a smooth and tidy surface, and because the inner part and the outer part are cast by the metal piece of the invention, the product with consistent inner and outer strength has higher strength and is more wear-resistant, and particularly, the stainless steel has the hardness and the wear resistance consistent with the whole body at the fine or bent part, thereby effectively avoiding the problems of influencing the sealing effect and the like due to the structural deformation caused by wear, avoiding the phenomenon of exposed corrosion of the iron inner core even if the hard sealing element is used for a long time, and compared with the existing hard sealing element, the hard sealing element prepared by the invention has longer service life, higher use stability and higher.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. The stainless steel for mechanical sealing is characterized in that: contains, in mass%, 5.0 to 15.0% of B, Si: 1.0-2.0%, Cr: 13.0 to 25.0%, Ni: 9.5 to 14.5%, Mn: 2.0-5.0%, C: 0.9-3.0%, Cu: 1.5% -4.5%, Mo: 0.25 to 5%, the balance being Fe and unavoidable impurities, and heat treating the steel so that the microstructure of the steel comprises 45 to 75% of austenite under the heat treatment conditions, and the remainder of the microstructure is ferrite.
2. The stainless steel for mechanical seal with high hardness and wear resistance according to claim 1, wherein: the alloy consists of the following elements in percentage by mass: 10.0%, Si: 1.5%, Cr: 25.0%, Ni: 9.5%, Mn: 2.5%, C: 0.9%, Cu: 1.5%, Mo: 0.3%, and the balance of Fe and inevitable impurities.
3. Stainless steel for mechanical seals according to claim 1, characterized in that: the alloy consists of the following elements in percentage by mass: 5.0%, Si: 1%, Cr: 13.0%, Ni: 14.5%, Mn: 5.0%, C: 1.5%, Cu: 3%, Mo: 4%, and the balance of Fe and inevitable impurities.
4. A mechanical seal casting characterized by using the stainless steel for mechanical seal having high hardness and wear resistance according to any one of claims 1 to 3, which is a valve fitting or a seal for hard seal.
5. A method of making a mechanical seal casting according to claim 4, comprising the steps of:
step 1, smelting, namely smelting according to the components of the claim 1;
step 2, heating, and keeping the temperature for 3-5 minutes in an intermediate frequency furnace at 1750-1800 ℃; then the temperature is reduced to 1650 ℃ and then the mixture is discharged,
forming an austenitic-ferritic stainless steel;
step 3, casting to obtain a casting after discharging;
step 4, quenching treatment, namely heating the casting obtained in the step 3 to 850-950 ℃, preserving heat for 2-6 hours, and then putting the casting into cold water for rapid cooling;
and 5, tempering, namely putting the quenched casting into a heat treatment furnace for tempering, and discharging and cooling when the heating temperature reaches 350-450 ℃.
6. A method of making a mechanical seal casting according to claim 5, wherein: in step 1, Fe, Mo, Ni, C, Cr, B, Mn, Si, Cu are sequentially added for melting and smelting.
7. A method of making a mechanical seal casting according to claim 4, wherein: the method is characterized in that: in the step 1, one or more of ferroboron, boron-nickel, boron-chromium, molybdenum boride and boron carbide is used as a raw material for component smelting in the B mode.
8. A method of making a mechanical seal casting according to claim 5, wherein: the method is characterized in that: in the step 1, one or more of ferroboron, boron-nickel, boron-chromium, molybdenum boride and boron carbide is used as a raw material for component smelting in the B mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010823516.1A CN111996454A (en) | 2020-08-17 | 2020-08-17 | Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010823516.1A CN111996454A (en) | 2020-08-17 | 2020-08-17 | Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111996454A true CN111996454A (en) | 2020-11-27 |
Family
ID=73473718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010823516.1A Pending CN111996454A (en) | 2020-08-17 | 2020-08-17 | Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111996454A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354239A (en) * | 2022-08-17 | 2022-11-18 | 常熟市港城不锈钢装饰有限责任公司 | Heat-resistant alloy steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302287A (en) * | 2013-06-18 | 2013-09-18 | 华北电力大学 | Iron-based amorphous powder for wear-resisting and corrosion-resisting coating and preparation method thereof |
| CN104357751A (en) * | 2014-10-24 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Double-phase stainless steel material of valve and preparation method of double-phase stainless steel material |
-
2020
- 2020-08-17 CN CN202010823516.1A patent/CN111996454A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302287A (en) * | 2013-06-18 | 2013-09-18 | 华北电力大学 | Iron-based amorphous powder for wear-resisting and corrosion-resisting coating and preparation method thereof |
| CN104357751A (en) * | 2014-10-24 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Double-phase stainless steel material of valve and preparation method of double-phase stainless steel material |
Non-Patent Citations (3)
| Title |
|---|
| 刘华江等: "《设计师的材料清单 建筑篇》", 30 September 2019 * |
| 张应立等: "《常用金属材料焊接技术手册》", 31 January 2015 * |
| 那宝魁: "《钢铁企业标准化管理体系》", 31 July 2015 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354239A (en) * | 2022-08-17 | 2022-11-18 | 常熟市港城不锈钢装饰有限责任公司 | Heat-resistant alloy steel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2015353251B2 (en) | Low-alloy high-strength high-tenacity steel panel and method for manufacturing same | |
| EP2662460A1 (en) | Tough bainitic heat treatments on steels for tooling | |
| RU2763722C1 (en) | SULPHUR-RESISTANT PIPE FOR A PETROLEUM BOREHOLE ATTRIBUTED TO THE KILOPOUND/INCH2 (862 MPa) STEEL STRENGTH CLASS, AND METHOD FOR MANUFACTURE THEREOF | |
| CN109735777B (en) | Anti-oxidation hot-work die steel and preparation method thereof | |
| WO2019080457A1 (en) | Nitrogen-containing microalloying spring steel and preparation method therefor | |
| CN109835014B (en) | High-strength high-toughness wear-resistant composite steel plate and manufacturing method thereof | |
| CN113249643B (en) | Mining high-strength carburized chain steel and preparation method thereof | |
| CN102330031A (en) | High-tenacity -130 DEG C low-temperature steel and manufacturing method thereof | |
| CN104988435A (en) | Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof | |
| CN101413088A (en) | Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof | |
| CN113584407A (en) | High-strength high-temperature corrosion resistant martensitic stainless steel and manufacturing method thereof | |
| EP2546374A1 (en) | Steel for extrusion tools | |
| CN101880833A (en) | Stainless bearing steel adopting microalloying of rare earth and applicable to manufacturing miniature and small-size bearings and manufacturing method thereof | |
| CN114525447A (en) | Metal wire material for laser cladding and preparation method and application thereof | |
| CN109536844B (en) | High-temperature-resistant die steel and preparation method thereof | |
| CN109694983B (en) | High-mirror-surface corrosion-resistant plastic die steel and manufacturing method thereof | |
| CN111996454A (en) | Stainless steel for mechanical seal, mechanical seal casting made of stainless steel and preparation method of mechanical seal casting | |
| CN114196875B (en) | Stainless steel for valve plate and heat treatment method thereof | |
| CN114086083B (en) | 1100 MPa-grade sulfur-resistant high-pressure gas cylinder steel, high-pressure gas cylinder and manufacturing method thereof | |
| CN109055645A (en) | A kind of economical HIC resistance pipeline steel plate X52NS and its manufacturing method of the delivery of normalizing state | |
| CA3139909C (en) | Electric-resistance-welded steel pipe or tube for hollow stabilizer | |
| EP4215636A1 (en) | High-plasticity thermoformed steel having oxidation resistance for automobile, and thermoforming process | |
| CN114107784A (en) | High-hardenability boron-containing quenched and tempered steel, round steel and manufacturing method thereof | |
| CN115896631B (en) | Round steel for rolling balls and rolling ball preparation method | |
| CN108048750A (en) | A kind of corrosion-resistant tensile type steel alloy and its production technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |