CN112281084B - Processing technology of hydrogen-contacting high-pressure large-caliber thick-wall stainless steel pipe fitting - Google Patents
Processing technology of hydrogen-contacting high-pressure large-caliber thick-wall stainless steel pipe fitting Download PDFInfo
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
The invention discloses a process for processing a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting, which comprises the following steps: selecting a steel pipe containing the following elements in percentage by mass: 0.04-0.08% of C, less than or equal to 2.0% of Mn, less than or equal to 1.0% of Si, 17-19% of Cr, 9-13% of Ni, 11-1.0% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurities; and then sequentially carrying out cutting, hot press molding, cold cutting and leveling, shaping, heat treatment, inspection and test, finished product detection and identification, and packaging and protection on the steel pipe. By optimizing the processing technological parameters, the invention refines the tissue grain size of the pipe fitting, prevents the precipitation of harmful phases and the formation of abnormal tissues, and ensures that the quality indexes of the product, such as grain size level, mechanical property, corrosion resistance and the like, meet the requirements of corresponding engineering specifications and standards.
Description
Technical Field
The invention relates to the technical field of stainless steel pipe fitting processing, in particular to a processing technology of a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting.
Background
At present, the quality of petroleum resources at home and abroad is lower and lower, and the quality requirement on finished oil is higher and higher. Meanwhile, the demand of national economic construction for finished oil and chemical products is increasing, which promotes the construction and development of refining devices towards high capacity and high yield. Therefore, the steel grade, specification and quality requirements of the pipeline material of the large-yield advanced refining device are gradually improved. The hydrogen-contacting high-pressure stainless steel pipeline is in the operation working conditions of high temperature, high pressure and strong corrosion, the operation medium is inflammable and explosive, the requirement on the pipeline connecting pipe fitting of a process system is high in quality safety performance, and meanwhile, the stainless steel large-caliber thick-wall pipe fitting in the hydrogen-contacting working condition has high manufacturing process difficulty due to the material characteristics, and the traditional production process cannot realize the realization of qualified products.
The traditional austenitic stainless steel material does not have the characteristic of heat treatment strengthening, and the hot working process of the pipe fitting can cause each property of the material to be attenuated to a certain degree. The stainless steel pipe fitting is very sensitive to hot working temperature, and the crystal grains of the material are enlarged due to overhigh temperature and overlong heating time, and harmful phases are separated out, so that the obdurability and the corrosion resistance are reduced. When the operation temperature is too low, a large amount of Cr carbide is precipitated among the material grains of the stainless steel pipe fitting, so that the material grains are poor in chromium and have an intercrystalline corrosion tendency.
Therefore, through a large amount of experiments and researches on the hot forming and heat treatment temperature of the product, the temperature control parameters of all heating links of the product are optimized and formulated. Meanwhile, a controlled rolling process with high speed and large deformation of the product is worked out by researching the thermal deformation process of the product, so that the metallographic structure of the product generates high-temperature dynamic recrystallization behavior in the forming process, the grain size of the material is refined, the structure of the product is uniform after final heat treatment, the performance is stable, and the requirements of application working conditions are met.
Disclosure of Invention
Based on the technical scheme, the invention aims to provide a process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting. The invention designs reasonable technical requirements of raw materials, and enables the materials to have feasible quality foundation and machining allowance. Through unique control of temperature and rolling forming process, the product maintains and refines the texture grain size, prevents the precipitation of harmful phases and the formation of abnormal textures, and lays an excellent texture foundation for final heat treatment. Finally, through full solid solution and stabilization heat treatment, uniform and stable internal structure of the finished product is obtained, so that the quality indexes of the product, such as grain size level, mechanical property, corrosion resistance and the like, meet the requirements of corresponding engineering specifications and standards.
The invention relates to a process for processing a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting, which comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.04-0.08% of C, less than or equal to 2.0% of Mn, less than or equal to 1.0% of Si, 17-19% of Cr, 9-13% of Ni, 11-1.0% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) hot-pressing and molding the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment;
7) the method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning, nondestructive testing, end machining and pickling passivation treatment after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
Preferably, the austenitic structure in the steel pipe in the step 1) is more than or equal to 5-grade grain size; rm is more than or equal to 515 Mpa; rp0.2≥205Mpa；500℃Rp0.2≥139Mpa。
Preferably, the heating temperature in the step 3) is 1040 +/-10 ℃, the finishing temperature is more than or equal to 850 ℃, the deformation rate is more than or equal to 3.3mm/S, and the deformation rate is more than or equal to 1.6.
Preferably, the solution treatment in the step 6) is to perform heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then perform water cooling.
Preferably, the stabilizing heat treatment in the step 6) is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
Preferably, the surface cleaning in step 7) comprises acid washing and mechanical coping.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the quality indexes of the delivery state of the raw material steel pipe for the WP347 hydro-high pressure stainless steel large-caliber thick-wall tee bend are researched and designed, so that the raw material is ensured to have excellent quality foundation and performance index allowance. The content and reasonable proportion of main elements of the material, the purity and impurity content of the material and the grain size of the material in a heat treatment state are limited, and the raw material is ensured to have initial excellent quality foundation;
in the process of hot processing of the pipe, all thermal deformation processes are subjected to strict temperature control rolling. The heating temperature is controlled within 1040 +/-10 ℃, the finishing temperature is controlled above 850 ℃, and then the tube blank is forced to be rapidly cooled to the room temperature after the forming of each pass is finished. Meanwhile, the deformation rate of the material is more than or equal to 3.3mm/S and the deformation rate is more than or equal to 1.6 in the pressing process. The temperature interval of coarse grains and harmful phase precipitation is avoided in the forming process, and the total heating time of the tube blank is effectively shortened. Under the control of the temperature and rolling control process, the material realizes high-temperature dynamic recrystallization behavior to refine the grain size, and provides an excellent tissue foundation for final heat treatment. Finally, through full solid solution and stabilization heat treatment, carbon and alloy elements of the material are uniformly dissolved in the crystal in a solid manner to form a stable room temperature structure with fine grain size, thereby ensuring the product characteristics of high temperature resistance, corrosion resistance, high strength and good toughness.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.05% of C, 1.5% of Mn, 0.5% of Si, 17% of Cr, 10% of Ni, 0.3% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of iron and inevitable impurities; the austenite structure and the grain size in the steel pipe are more than or equal to 5 grades; rm is more than or equal to 515 Mpa; rp0.2≥205Mpa；500℃Rp0.2≥139Mpa；
2) Cutting the steel pipe into blanks with specified sizes;
3) and (3) hot-pressing and forming the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass. Wherein the heating temperature is 1040 +/-10 ℃, the finishing temperature is 900 ℃, the deformation rate is 3.5mm/S, and the deformation rate is 2.0;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment; wherein the solution treatment is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling. The stabilizing heat treatment is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
7) The method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning (acid cleaning and mechanical coping), nondestructive testing, end machining and acid cleaning passivation after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
Example 2
A process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.04% of C, 1.0% of Mn, 1.0% of Si, 19% of Cr, 11% of Ni, 0.5% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of iron and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) and (3) hot-pressing and forming the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass. Wherein the heating temperature is 1040 +/-10 ℃, the finishing temperature is 900 ℃, the deformation rate is 3.5mm/S, and the deformation rate is 2.0;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment; wherein the solution treatment is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling. The stabilizing heat treatment is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
7) The method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning (acid cleaning and mechanical coping), nondestructive testing, end machining and acid cleaning passivation after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
Example 3
A process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.08 percent of C, 0.5 percent of Mn, 1.0 percent of Si, 17.5 percent of Cr, 12 percent of Ni, 0.1 percent of Nb, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, and the balance of iron and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) and (3) hot-pressing and forming the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass. Wherein the heating temperature is 1040 +/-10 ℃, the finishing temperature is 900 ℃, the deformation rate is 3.5mm/S, and the deformation rate is 2.0;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment; wherein the solution treatment is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling. The stabilizing heat treatment is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
7) The method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning (acid cleaning and mechanical coping), nondestructive testing, end machining and acid cleaning passivation after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
Example 4
A process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.07 percent of C, 1.3 percent of Mn, 0.8 percent of Si, 18 percent of Cr, 13 percent of Ni, 1.0 percent of Nb, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) and (3) hot-pressing and forming the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass. Wherein the heating temperature is 1040 +/-10 ℃, the finishing temperature is 900 ℃, the deformation rate is 3.5mm/S, and the deformation rate is 2.0;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment; wherein the solution treatment is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling. The stabilizing heat treatment is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
7) The method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning (acid cleaning and mechanical coping), nondestructive testing, end machining and acid cleaning passivation after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
Example 5
A process for machining a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting comprises the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.06% of C, 1.8% of Mn, 1.0% of Si, 17% of Cr, 10% of Ni, 0.9% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) and (3) hot-pressing and forming the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass. Wherein the heating temperature is 1040 +/-10 ℃, the finishing temperature is 900 ℃, the deformation rate is 3.5mm/S, and the deformation rate is 2.0;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment; wherein the solution treatment is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling. The stabilizing heat treatment is to keep the temperature of the pipe after the solution treatment at 900 +/-10 ℃ for 4.7min/mm, and then air-cool the pipe.
7) The method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning (acid cleaning and mechanical coping), nondestructive testing, end machining and acid cleaning passivation after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (2)
1. A processing technology of a hydrogen high-pressure large-caliber thick-wall stainless steel pipe fitting is characterized by comprising the following steps:
1) selecting a steel pipe containing the following elements in percentage by mass:
0.04-0.08% of C, less than or equal to 2.0% of Mn, less than or equal to 1.0% of Si, 17-19% of Cr, 9-13% of Ni, 0.5-1.0% of Nb, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurities;
2) cutting the steel pipe into blanks with specified sizes;
3) hot-pressing and molding the blank, controlling the rolling temperature and the rolling quantity of each pass, quickly cooling the whole pipe blank to room temperature after each pass of rolling is finished, and then heating the pipe blank in a furnace for the next pass;
4) cold cutting the redundant part of the end of the formed pipe fitting by using a metal sawing machine to remove the redundant part to be flush;
5) shaping, heating the semi-finished product according to a forming heating process, and then performing shape correction and pipe end rounding;
6) performing heat treatment, namely performing solution treatment on the pipe fitting by adopting a box-type resistance heat treatment furnace and an automatic solution treatment facility, and then performing stabilization heat treatment;
7) the method comprises the following steps of sampling the batch of pipe fittings for room temperature tensile test, high temperature tensile test, hardness test and metallographic test of each part of a pipe body and intercrystalline corrosion test, and performing surface cleaning, nondestructive testing, end machining and pickling passivation treatment after each index meets the standard requirement;
8) detecting and marking a finished product;
9) packaging and protecting;
step 1), austenite structure and grain size of the steel pipe are more than or equal to 5 grades; rm is more than or equal to 515 MPa; rp0.2≥205MPa；500℃Rp0.2≥139MPa；
The heating temperature in the step 3) is 1040 +/-10 ℃, the finishing temperature is more than or equal to 850 ℃, the deformation rate is more than or equal to 3.3mm/s, and the deformation rate is more than or equal to 1.6;
the solid solution treatment in the step 6) is to carry out heat preservation treatment on the shaped pipe at 1040 +/-10 ℃ for 1.5min/mm, and then water cooling;
and 6) the stabilizing heat treatment is to carry out heat preservation on the pipe fitting subjected to the solution treatment at the temperature of 900 +/-10 ℃ for 4.7min/mm, and then air cooling.
2. The process for machining a high-pressure large-caliber thick-wall stainless steel pipe fitting in hydrogen according to claim 1, wherein the surface cleaning in the step 7) comprises acid washing and mechanical grinding.
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