CN116837184A - Method for determining quenching medium concentration of steel seamless pressure vessel - Google Patents
Method for determining quenching medium concentration of steel seamless pressure vessel Download PDFInfo
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- 238000010791 quenching Methods 0.000 title claims abstract description 216
- 230000000171 quenching effect Effects 0.000 title claims abstract description 214
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 claims abstract description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000010586 diagram Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 53
- 239000006247 magnetic powder Substances 0.000 claims description 9
- 238000007542 hardness measurement Methods 0.000 claims description 6
- 238000012797 qualification Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 10
- 238000005336 cracking Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910001046 4142 steel Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/55—Hardenability tests, e.g. end-quench tests
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Abstract
The application provides a method for determining the concentration of quenching medium in a steel seamless pressure vessel, which comprises the following steps: s1, processing a plurality of end quenching samples; s2, preparing a plurality of groups of water-based quenching agent solutions; s3, heating and preserving heat of the end quenching sample, and contacting the test end face of the end quenching sample with a water-based quenching agent solution; s4, processing a detection surface on the end quenching sample, and measuring hardness; s5, drawing a relation curve between the distance from the test end surface and the hardness value at the corresponding position, and obtaining the distance L from the hardness detection point corresponding to the inflection point of the hardness value to the test end surface; s6, drawing a relation diagram of the concentration of the L and the water-based quenching agent solution; s7, determining the water-based quenching agent concentration K of the pressure vessel with the nominal wall thickness H during heat treatment quenching cooling based on the relation diagram of S6; the method solves the problems of multiple times of testing the large furnace and no applicability to different nominal wall thicknesses in the prior art, can rapidly and effectively determine the concentration of the quenching medium, and effectively improves the safety and reliability of the pressure vessel.
Description
Technical Field
The application relates to the field of pressure vessels, in particular to a method for determining the concentration of quenching medium in a steel seamless pressure vessel.
Background
The steel seamless pressure container is mainly used for storing and transporting various high-pressure compressed gases and liquefied gases, and the pressure bearing capacity of the pressure container needs to meet the requirements in order to ensure the safety and reliability of the stored and transported gases, so that the material performance of the bottle body needs to be ensured to meet the design requirements.
In the manufacturing process of the steel seamless pressure vessel, the performance of the bottle body material is often adjusted by adopting a quenching and high-temperature tempering heat treatment mode, so that the performance of the bottle body material is ensured to meet the design requirement. When the steel seamless pressure vessel is subjected to heat treatment, quenching and cooling, a water-based quenching agent solution is generally selected for heat treatment, and the main reason is that: (1) the steel seamless pressure vessel is of a hollow structure, two ends are closed when in quenching and cooling, water is used as a quenching medium, cooling is fast, quenching cracking is easy, products are scrapped, the concentration of the water-based quenching agent solution can be adjusted, the cooling speed is reduced, and the occurrence of quenching cracking is avoided; (2) the structural stress is larger during water quenching, the deformation of the product is easy to be serious, the post-processing is influenced, the structural stress is smaller during water-based quenching medium cooling, and the deformation tendency of the product is reduced. Therefore, water-based quenchant solutions are widely used as quenching media in the field of steel seamless pressure vessel manufacturing.
At present, the material marks and the nominal wall thicknesses of the steel seamless pressure containers with different bearing grades are different, so that when quenching and cooling are carried out, the concentration of the water-based quenching agent is often required to be regulated according to the material marks and the nominal wall thicknesses, the quenching speed is prevented from being too high while the quenching of the materials is ensured, and the quenching cracking phenomenon is generated. However, as the two ends of the steel seamless pressure vessel are sealed during quenching and cooling, the vessel is in a single-sided quenching and cooling state, and the conventional small sample process test is in a double-sided quenching and cooling state, which is completely different from the single-sided quenching and cooling state of the vessel, and the conventional small sample process test cannot effectively replace the heat treatment state of the pressure vessel.
In the prior art, a large furnace test ring sealing mode is generally adopted for quenching and cooling test, and the optimal water-based quenching agent concentration is determined according to magnetic powder detection and mechanical property detection results after heat treatment. However, the method needs to perform multiple furnace tests, has long time consumption and high cost, and the quenching medium concentration determined by the method has no applicability to other steel seamless pressure vessels with nominal wall thickness under the same material grade, and if the quenching medium concentration of the steel seamless pressure vessels with different nominal wall thickness under the same grade needs to be determined, the related test needs to be performed again, so that the times of furnace heat treatment are excessive, the test operation is complicated, and the test efficiency is lower.
Disclosure of Invention
In view of the above, the application aims to provide a method for determining the concentration of a quenching medium of a steel seamless pressure vessel, so as to solve the problems of more times of heat treatment of a large furnace, complicated test operation, lower test efficiency and the like in the process of determining the optimal water-based quenching agent concentration of the pressure vessel in the prior art.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
a method for determining the concentration of quenching medium in a steel seamless pressure vessel comprises the following steps: s1, taking any steel material with a material grade, and processing a plurality of end quenching samples; s2, preparing a plurality of groups of water-based quenching agent solutions, wherein the end quenching samples are in one-to-one correspondence with the water-based quenching agent solutions; s3, heating and preserving heat of the end quenching sample, and then contacting the test end face of the end quenching sample with a corresponding water-based quenching agent solution to perform an end face quenching cooling test; s4, processing a detection surface on the end quenching sample after the end quenching cooling test, and measuring the hardness on the detection surface; s5, according to the hardness measurement result in the step S4, drawing a relation curve between the distance from the test end surface and the hardness value at the corresponding position, and obtaining the distance L from the hardness detection point corresponding to the inflection point of the hardness value to the test end surface; s6, drawing a relation diagram of the L and the water-based quenching agent solution concentration according to the L of each end quenching sample obtained in the step S5 and the concentration of the water-based quenching agent solution corresponding to each end quenching sample; s7, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6.
Further, the body of the end quenching sample is a cylinder, the central axis of the end quenching sample is recorded as an axis, and one end face of the end quenching sample is a test end face and is used for contacting with the water-based quenching agent solution.
Further, the test end face is circular, and the detection surface is obtained by cutting the test end face along a direction parallel to the axis of the end-quenched sample with any one chord thereof.
Further, in step S2, the concentrations of any two groups of water-based quenching agent solutions are different, and the number of groups of water-based quenching agent solutions is equal to the number of end quenching samples in step S1.
Further, the distance L obtained in step S5 is equal to the nominal wall thickness.
Further, step S7 includes: s71, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6; s72, taking a sample with the nominal wall thickness H for heat treatment, carrying out a ring testing large furnace heat treatment test based on the water-based quenching agent concentration K, carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, judging whether the sample meets the qualification condition, if so, carrying out large furnace heat treatment on a pressure container product with the nominal wall thickness H by adopting K, and if not, adjusting the water-based quenching agent concentration.
Further, the qualified condition is that the sample is quenched and not quenched.
Compared with the prior art, the method for determining the quenching medium concentration of the steel seamless pressure vessel has the following advantages:
according to the method for determining the quenching medium concentration of the steel seamless pressure vessel, disclosed by the application, the distance L corresponding to the material hardness inflection points under different water-based quenching agent concentrations is determined, the distance L is the nominal wall thickness of the material, on the basis, a relation diagram between the water-based quenching agent concentration and the nominal wall thickness of the material is established, the concentration of the water-based quenching medium for heat treatment quenching cooling of materials with different nominal wall thicknesses can be effectively guided through the relation diagram, the problems that the number of times of tests of a large furnace is large and the quenching medium concentration of the pressure vessel with different nominal wall thicknesses is not applicable in the prior art are solved, the heat treatment of the pressure vessel with different material grades and different nominal wall thicknesses can be rapidly and effectively determined, and the safety and reliability of the use of the steel seamless pressure vessel are effectively improved.
Compared with the prior art, the method has the advantages of less test times, simple and convenient test operation and contribution to improving test efficiency; meanwhile, the application has good applicability to the materials with the same grade, can effectively guide the difficult problem of heat treatment of steel seamless containers with different nominal wall thicknesses, ensures that the materials are not quenched and cracked after quenching and cooling, and ensures that the steel seamless pressure container after heat treatment has good strength and toughness matching property, thereby ensuring the mechanical property of the steel seamless pressure container after heat treatment and the safety and reliability of product use.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a structure of an end quenching sample in a method for determining the concentration of a quenching medium in a steel seamless pressure vessel according to an embodiment of the present application;
FIG. 2 is an isometric view of an end quenching sample in a method for determining the concentration of a quenching medium in a steel seamless pressure vessel according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a structure of a steel seamless pressure vessel after a detection surface is cut in a method for determining a quench medium concentration according to an embodiment of the present application;
FIG. 4 is a graph showing correspondence between the position of the inflection point of hardness (the distance between the hardness detection point and the test end face) of the material and the concentration of the quenching medium in example 1 (4130X steel) of the present application;
FIG. 5 is a graph showing correspondence between the position of the inflection point of hardness (the distance between the hardness detection point and the test end face) of the material and the concentration of the quenching medium in example 2 (4142 steel) of the present application.
Reference numerals illustrate:
1. testing the end face; 2. an axis; 3. and (5) detecting the surface.
Detailed Description
The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The concentration percentage in the application is mass concentration percentage.
The application will be described in detail below with reference to the drawings in connection with embodiments.
In the prior art, for a certain pressure container, the optimal water-based quenching agent concentration is determined, a quenching cooling test is usually carried out by adopting a large furnace test ring sealing mode, and the optimal water-based quenching agent concentration is determined according to magnetic powder detection and mechanical property detection results after heat treatment. However, the method needs to perform multiple furnace tests, has long time consumption and high cost, and the quenching medium concentration determined by the method has no applicability to other steel seamless pressure vessels with nominal wall thickness under the same material grade, and if the quenching medium concentration of the steel seamless pressure vessels with different nominal wall thickness under the same grade needs to be determined, the related test needs to be performed again, so that the times of furnace heat treatment are excessive, the test operation is complicated, and the test efficiency is lower.
In order to solve the problems of more times of heat treatment of a large furnace, complicated test operation, lower test efficiency and the like in the process of determining the optimal water-based quenching agent concentration aiming at a pressure container in the prior art, the embodiment provides a method for determining the quenching medium concentration of a steel seamless pressure container, which comprises the following steps:
s1, taking any steel material with a material grade, and processing a plurality of end quenching samples;
the application can be used for testing any material grade steel, but for testing a certain material grade steel, a plurality of end quenching samples with the same specification are processed by using the material grade steel.
As shown in fig. 1-2, the body of the end-quenched sample is cylindrical, and in a geometric sense, the end-quenched sample has a central axis, denoted as axis 2; one end face of the end quenching sample is a test end face 1 and is used for contacting with water-based quenching agent solution to carry out a test, a flanging is arranged at the outer edge of the other end of the end quenching sample, and the diameter of one end of the flanging is larger than that of the test end face 1 so as to be convenient for fixing or clamping the end quenching sample.
S2, preparing a plurality of groups of water-based quenching agent solutions, wherein the end quenching samples are in one-to-one correspondence with the water-based quenching agent solutions;
in step S2, preferably, the concentrations of any two groups of water-based quenching agent solutions are different, and the number of groups of water-based quenching agent solutions is equal to the number of end quenching samples in step S1; therefore, one end quenching sample corresponds to one group of water-based quenching agent solution, the condition that the concentration of the water-based quenching agent solution is repeated does not exist, unnecessary repeated tests are avoided, and unnecessary waste of materials is avoided.
S3, heating and preserving heat of the end quenching sample, and then contacting a test end face 1 of the end quenching sample with a corresponding water-based quenching agent solution to perform an end face quenching cooling test;
in step S3, since the "corresponding water-based quenchant solution" also has the corresponding concentration, it is also understood that the end-quenched sample is contacted with the solution of the corresponding water-based quenchant concentration. Meanwhile, in the step S3, instead of only testing one end quenching sample, a plurality of end quenching samples may be tested one by one according to test requirements, and even all end quenching samples in the step S1 may be tested one by one. For steels of different brands, the heating temperature and the heat preservation condition in the heat treatment process are different, and the application is not particularly limited by referring to the related operation conditions in the prior art.
S4, processing a detection surface 3 parallel to the axis 2 of the end quenching sample on the outer side wall of the end quenching sample, which is close to the test end surface 1, of the end quenching sample after the end quenching cooling test, and measuring the hardness on the detection surface 3;
as shown in fig. 3, the test end surface 1 (circular) may be cut along a direction parallel to the axis 2 of the end-quenched sample, and the cut surface parallel to the axis 2 of the end-quenched sample may be the detection surface 3.
S5, according to the hardness measurement result in the step S4, drawing a relation curve between the distance from the test end face 1 and the hardness value at the corresponding position, and obtaining the distance L from the hardness detection point corresponding to the inflection point of the hardness value to the test end face 1;
wherein the distance L is the nominal wall thickness. For the avoidance of doubt, the "distance" in the present application is the minimum distance of any hardness measurement point from the test end face 1, which is a common knowledge in geometry.
Likewise, both steps S4, S5 can be understood as a test-by-test procedure for a plurality of end-quenched samples.
S6, drawing a relation diagram of the L and the water-based quenching agent solution concentration according to the L of each end quenching sample obtained in the step S5 and the concentration of the water-based quenching agent solution corresponding to each end quenching sample;
and S6, obtaining the quench-through nominal wall thickness of the material in water-based quenching agent solutions with different concentrations, and determining the water-based quenching agent concentration in the heat treatment quenching cooling according to the nominal wall thickness in the later stage. Wherein, the heat treatment process in the application comprises quenching and high-temperature tempering.
Correspondingly, as shown in fig. 4 and 5, in the relation diagrams, the quenching medium concentration is taken as a vertical axis, and the "hardness inflection point-end face distance" is taken as a horizontal axis, wherein the "hardness inflection point-end face distance" can be specifically understood as: the minimum distance between the hardness detection point corresponding to the inflection point of the hardness value and the test end face 1 is the nominal wall thickness.
S7, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6.
According to the method for determining the quenching medium concentration of the steel seamless pressure vessel, disclosed by the application, the distance L corresponding to the hardness inflection points of the materials under different water-based quenching agent concentrations is determined, the distance L is the nominal wall thickness of the materials, and on the basis, a relation diagram between the water-based quenching agent concentration and the nominal wall thickness of the materials is established, and the concentration of the water-based quenching medium for heat treatment quenching cooling of the materials with different nominal wall thicknesses can be effectively guided through the relation diagram, so that the problems of multiple times of large furnace tests and no applicability to the different nominal wall thicknesses in the prior art are solved, the quenching medium concentration of the pressure vessel with different material grades and different nominal wall thicknesses can be rapidly and effectively determined, the heat treatment of the steel seamless pressure vessel is guided, and the safety and reliability of the use of the steel seamless pressure vessel are effectively improved.
Compared with the prior art, the method has the advantages of less test times, simple and convenient test operation and contribution to improving test efficiency; meanwhile, the application has good applicability to the materials with the same grade, can effectively guide the difficult problem of heat treatment of steel seamless containers with different nominal wall thicknesses, ensures that the materials are not quenched and cracked after quenching and cooling, and ensures that the steel seamless pressure container after heat treatment has good strength and toughness matching property, thereby ensuring the mechanical property of the steel seamless pressure container after heat treatment and the safety and reliability of product use.
In addition, in order to ensure the correctness of the obtained concentration value, step S7 of the present application includes:
s71, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6;
s72, taking a sample with the nominal wall thickness H for heat treatment, carrying out a ring testing large furnace heat treatment test based on the water-based quenching agent concentration K, carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, judging whether the sample meets the qualification condition, if so, carrying out large furnace heat treatment on a pressure container product with the nominal wall thickness H by adopting K, and if not, adjusting the water-based quenching agent concentration.
The qualified condition is that the sample is quenched and not quenched and cracked. The operation and the sample of the heat treatment test of the test ring furnace can be directly adopted in the prior art, and the description is omitted.
Therefore, after the relation between the nominal wall thickness H and the water-based quenching agent concentration K (namely, the relation chart obtained in the step S6) is determined, the result of the relation chart is further verified by the conventional test ring furnace heat treatment test, and the relation chart is applied to furnace heat treatment of the pressure container product after the correctness of the concentration value is confirmed, so that the correctness of the test result can be ensured, further guarantee is provided for the qualification rate of the pressure container product, and on the other hand, errors or errors possibly existing in the test process can be found in time, and corresponding problems can be adjusted and corrected in time.
Example 1
Taking a steel seamless pressure vessel with the trade name of 4130X as an example, the water-based quenchant concentration determination process is briefly described in this example.
1) Processing end quenching samples by 4130X materials, wherein the number of the samples is preliminarily determined to be 6;
2) The concentration range of the water-based quenching agent solution is adjusted to be 1% -10%, and six groups of water-based quenching agent solutions of 1%, 3%, 5%, 6%, 7% and 10% are initially adopted, so that one end quenching sample corresponds to one concentration, and a subsequent test is carried out; accordingly, the present embodiment is described only by taking 6 groups as examples, and more groups may be provided.
3) Heating the end quenching sample to 900 ℃ and preserving heat for 35min, placing the end quenching sample on a liquid spraying device, and contacting the test end surface 1 of the end quenching sample with a water-based quenching agent solution with corresponding concentration to perform an end surface quenching cooling test;
4) Processing a detection surface 3 parallel to the axis 2 of the end quenching sample on the end quenching sample, and measuring hardness on the detection surface 3;
5) Drawing a relation curve between the distance from the test end face 1 and the hardness value at the corresponding position according to the hardness measurement result to obtain a distance L corresponding to the inflection point of the hardness value, wherein the distance L is the nominal wall thickness;
6) For the corresponding relation diagram of the position (namely each distance L) of the hardness inflection point of the end quenching sample of the 4130X material under 6 groups of water-based quenching agent solutions and the concentration of the water-based quenching agent, as shown in figure 4, the quench-through nominal wall thickness of the 4130X material under the water-based quenching agent solution with the concentration of 1% -10%, the corresponding relation line in figure 4 is observed, so that the concentration of the water-based quenching agent is 7% when the 4130X material with the nominal wall thickness of 10mm is quenched and cooled, and the concentration of the water-based quenching agent is 1% when the 4130X material with the nominal wall thickness of 30mm is quenched and cooled;
7) And carrying out large furnace heat treatment on 4130X test rings with nominal wall thickness of 10mm, carrying out a 4130X material test ring large furnace heat treatment test by adopting quenching liquid with the concentration of 7%, and carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, wherein the result shows that the test rings are completely quenched and are not cracked, so that the product large furnace heat treatment is carried out by adopting 7% quenching liquid when the steel seamless pressure vessel with the specification 4130X material is quenched and cooled.
8) And carrying out large furnace heat treatment on 4130X test rings with nominal wall thickness of 30mm, carrying out a 4130X material test ring large furnace heat treatment test by adopting the quenching liquid with the concentration of 1%, and carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, wherein the result shows that the test rings are completely quenched and are not cracked, so that the product large furnace heat treatment is carried out by adopting the quenching liquid with the concentration of 1% when the steel seamless pressure vessel with the specification 4130X material is quenched and cooled.
Example 2
Taking a steel seamless pressure vessel with the trade name 4142 as an example, the present embodiment briefly describes the water-based quenchant concentration determination process.
1) Selecting 4142 materials to process end quenching samples, and preliminarily determining the number of the samples to be 8;
2) The concentration range of the water-based quenching agent solution is adjusted to be 1% -10%, and eight groups of water-based quenching agent solutions, namely 1%, 2%, 4%, 5%, 6%, 7%, 8% and 10%, are initially adopted, so that one end quenching sample corresponds to one concentration, and a subsequent test is carried out; accordingly, the present embodiment is described only by taking 8 groups as examples, and more groups may be provided.
3) Heating the end quenching sample to 860 ℃ and preserving heat for 30min, then placing the end quenching sample on a liquid spraying device, and contacting the test end surface 1 of the end quenching sample with a water-based quenching agent solution with corresponding concentration to perform an end surface quenching cooling test;
4) Processing a detection surface 3 parallel to the axis 2 of the end quenching sample on the end quenching sample, and measuring hardness on the detection surface 3;
5) Drawing a relation curve between the distance from the test end face 1 and the hardness value at the corresponding position according to the hardness measurement result to obtain a distance L corresponding to the inflection point of the hardness value, wherein the distance L is the nominal wall thickness;
6) For the corresponding relation diagram of the position (namely each distance L) of the hardness inflection point of the end quenching sample of the 4142 material under 8 groups of water-based quenching agent solutions and the concentration of the water-based quenching agent, as shown in the attached figure 5, the quench-through nominal wall thickness of the 4142 material under 1% -10% concentration water-based quenching agent solution can be obtained, the corresponding relation line in the attached figure 5 is observed, the concentration of the water-based quenching agent is 8% when the 4142 material with the nominal wall thickness of 10mm is quenched and cooled, and the concentration of the water-based quenching agent is 4% when the 4142 material with the nominal wall thickness of 30mm is quenched and cooled;
7) And carrying out large furnace heat treatment on 4142 test rings with nominal wall thickness of 10mm, carrying out a 4142 material test ring large furnace heat treatment test by adopting quenching liquid with concentration of 8%, carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, and displaying that the test rings are completely quenched and not cracked, thereby carrying out large furnace heat treatment on products by adopting quenching liquid with concentration of 8% when the steel seamless pressure vessel with the specification 4142 material is quenched and cooled.
8) And carrying out large furnace heat treatment on 4142 test rings with nominal wall thickness of 30mm, carrying out a 4142 material test ring large furnace heat treatment test by adopting the quenching liquid with the concentration of 4%, carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, and displaying that the test rings are completely quenched and not cracked, thereby carrying out large furnace heat treatment on products by adopting the quenching liquid with the concentration of 4% when the steel seamless pressure vessel with the specification 4142 material is quenched and cooled.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.
Claims (7)
1. A method for determining the concentration of a quenching medium in a steel seamless pressure vessel, the method comprising:
s1, taking any steel material with a material grade, and processing a plurality of end quenching samples;
s2, preparing a plurality of groups of water-based quenching agent solutions, wherein the end quenching samples are in one-to-one correspondence with the water-based quenching agent solutions;
s3, heating and preserving heat of the end quenching sample, and then contacting a test end surface (1) of the end quenching sample with a corresponding water-based quenching agent solution to perform an end surface quenching cooling test;
s4, processing a detection surface (3) on the end quenching sample after the end quenching cooling test, and measuring the hardness on the detection surface (3);
s5, according to the hardness measurement result in the step S4, drawing a relation curve between the distance from the test end surface (1) and the hardness value at the corresponding position, and obtaining the distance L between the hardness detection point corresponding to the inflection point of the hardness value and the test end surface (1);
s6, drawing a relation diagram of the L and the water-based quenching agent solution concentration according to the L of each end quenching sample obtained in the step S5 and the concentration of the water-based quenching agent solution corresponding to each end quenching sample;
s7, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6.
2. The method for determining the concentration of the quenching medium of the steel seamless pressure vessel according to claim 1, wherein the main body of the end quenching sample is a cylinder, a central axis of the end quenching sample is an axis (2), and one end face of the end quenching sample is a test end face (1) for contacting with the water-based quenching agent solution.
3. The method for determining the concentration of the quenching medium in the steel seamless pressure vessel according to claim 2, wherein the test end surface (1) is circular, and the detection surface (3) is obtained by cutting in a direction parallel to the axis (2) of the end quenching sample with any chord of the test end surface (1).
4. The method for determining the concentration of the quenching medium in the steel seamless pressure vessel according to claim 1, wherein in the step S2, the concentrations of any two groups of water-based quenching agent solutions are different, and the number of groups of water-based quenching agent solutions is equal to the number of end quenching samples in the step S1.
5. A method for determining the quench media concentration of a steel seamless pressure vessel in accordance with claim 1 wherein the distance L obtained in step S5 is equal to the nominal wall thickness.
6. The method for determining the concentration of quenching medium in a steel seamless pressure vessel according to claim 1, wherein the step S7 comprises:
s71, determining the water-based quenching agent concentration K during heat treatment quenching cooling for any pressure vessel with the nominal wall thickness H based on the relation diagram obtained in the step S6;
s72, taking a sample with the nominal wall thickness H for heat treatment, carrying out a ring testing large furnace heat treatment test based on the water-based quenching agent concentration K, carrying out surface magnetic powder detection and mechanical property detection after heat treatment after the test, judging whether the sample meets the qualification condition, if so, carrying out large furnace heat treatment on a pressure container product with the nominal wall thickness H by adopting K, and if not, adjusting the water-based quenching agent concentration.
7. The method for determining the concentration of the quenching medium of the steel seamless pressure vessel according to claim 6, wherein the qualified condition is that the sample is quenched and not quenched.
Priority Applications (1)
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