CN108754519B - Machining process of ultralow-temperature stainless steel forging for L NG equipment - Google Patents
Machining process of ultralow-temperature stainless steel forging for L NG equipment Download PDFInfo
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- CN108754519B CN108754519B CN201810687663.3A CN201810687663A CN108754519B CN 108754519 B CN108754519 B CN 108754519B CN 201810687663 A CN201810687663 A CN 201810687663A CN 108754519 B CN108754519 B CN 108754519B
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- Prior art keywords
- lifting frame
- pickling
- stainless steel
- forging
- steel forging
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention provides a processing technology of an ultralow temperature stainless steel forging for L NG equipment, which comprises the following steps of hoisting the stainless steel forging to an automatic underwater lifting platform in a pickling tank, wherein the automatic underwater lifting platform comprises a lifting frame, a sealing buoyancy tank and an opening buoyancy tank, a gas conveying pipeline is arranged on the lifting frame, the gas conveying pipeline is respectively communicated with a cavity of the opening buoyancy tank through a plurality of gas pipelines, the gas conveying pipeline is connected with a compressed gas source through an automatic valve, a timer is arranged on the automatic valve, an air release valve is further arranged on the gas conveying pipeline, the stainless steel forging is hoisted to the lifting frame, the air release valve is opened to discharge compressed gas in the opening buoyancy tank, the lifting frame automatically sinks to the bottom of the pickling tank, the air release valve is closed, pickling time is set on the timer of the automatic valve, the automatic valve is automatically opened when the set pickling time is reached, the lifting frame is lifted until a flange is exposed out of the pickling tank, and the pickled flange.
Description
Technical Field
The invention relates to a machining process of an ultralow-temperature stainless steel forging for L NG equipment.
Background
In recent years, with the continuous increase of liquefied natural gas consumption in the global scope, the demand for building new L NG facilities including mining, transportation, processing, storage and conveying equipment and the like is continuously increased, the service temperature, the working environment and the plum snow state of the facilities are different, the sound is coarse, various different alloys and welding materials are required, a stainless steel forging is inevitably required in the building and installation process of the L NG facility, the requirement for the stainless steel forging in the L NG facility is very strict, the technical indexes of the stainless steel forging include that the stainless steel forging has low temperature impact resistance (-196 ℃) of not less than 120J, tensile strength of not less than 490, yield strength of not less than 175 MPa and elongation of not less than 30%, the pickling process of the forging has high hydrogen embrittlement resistance, the requirement for the hydrogen embrittlement resistance is high, the pickling process of the forging has high requirements, not only a corrosion inhibitor needs to be added for dehydrogenation treatment, but also the pickling time is strict, the existing pickling tank is usually manually controlled in pickling process, is not strict, and the existing pickling tank is not directly lifted and is inconvenient to be lifted and hung in a lifting operation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a processing technology of an ultralow-temperature stainless steel forging for L NG equipment, which strictly controls pickling time through automatic equipment to ensure the hydrogen embrittlement resistance of the stainless steel forging.
In order to achieve the purpose, the technical scheme of the invention provides a processing technology of an ultralow-temperature stainless steel forging for L NG equipment, which comprises the following steps:
s1: blanking; then the blank is sent to a heating furnace to be heated, then a riser and a nozzle end are cut off, the riser section is cut off by 15-20%, and the nozzle end is cut off by 6-8%;
s2: the blank is sent to a heating furnace for heating before forging, and the initial forging temperature and the terminal temperature are ensured to be within the range of 1000-1200 ℃;
s3: the blank is sent to a forging procedure for preforming and final forming of the blank membrane forging;
s4: air cooling;
s5: the forging after the air cooling treatment is further pickled, the stainless steel forging is hoisted to an automatic water lifting platform in a pickling tank, the automatic water lifting platform comprises a lifting frame which is of a frame structure, a plurality of hollow sealed floating boxes and hollow opening floating boxes which are fixedly arranged at the bottom of the lifting frame, the sealed floating boxes and the opening floating boxes are arranged in a staggered mode, the bottom of each opening floating box is provided with an open hole communicated with the inner cavity of the opening floating box, a gas conveying pipeline is arranged on the lifting frame and is respectively communicated with the cavities of the opening floating boxes through a plurality of branch gas pipelines, compressed gas is compressed in the sealed floating boxes, the gas conveying pipeline is connected with a compressed gas source through an automatic valve, a timer is arranged on the automatic valve, and a gas release valve is further arranged on the gas conveying pipeline, hoisting the stainless steel forging onto the lifting frame and fixing the stainless steel forging by the positioning clamp on the lifting frame, opening the air release valve to discharge the compressed gas in the open buoyancy tank, automatically sinking the lifting frame to the bottom of the pickling tank, and closing the air release valve;
s6: setting pickling time on a timer of the automatic valve according to a pickling process, wherein hydrochloric acid with the concentration of 28-30% and a corrosion inhibitor are contained in the pickling tank;
s7: when the set pickling time is reached, the automatic valve is automatically opened, the compressed gas source fills compressed gas into the opening buoyancy tank, the lifting frame rises until the flange is exposed out of the pickling tank, and then the flange after pickling is lifted away from the lifting frame;
s8: machining the forged piece subjected to acid pickling to obtain a flange;
s9: and (5) packaging and warehousing the workpiece.
The further improvement is that: be provided with guide structure between crane and the pickling bath, guide structure including set up in the guide post in four bights of pickling bath, the guide post extends perpendicularly, seted up on the crane with guide post matched with guiding hole.
The further improvement is that: the corrosion inhibitor is one or a mixture of more of chromate, nitrite, silicate, molybdate, tungstate, polyphosphate and zinc salt.
The further improvement is that: the lifting frame is provided with a temperature probe and a heater, and the temperature probe is connected with a controller of the heater.
The invention has the advantages and beneficial effects that: carry out regularly the settlement time through setting up aquatic automatic rising platform, consequently strict the accuse to the time of pickling, guaranteed product quality greatly, aquatic lift platform utilizes buoyancy to adjust in addition and goes up and down, for traditional adoption dynamic type go up and down, can not lost in the pickling bath, if adopt lead screw lift, the lead screw soaks in acidizing fluid for a long time, has shortened life greatly.
Drawings
Fig. 1 is a schematic structural diagram of a pickling tank and an underwater lifting platform.
Wherein: 1. a lifting frame; 2. a pickling tank; 3. sealing the buoyancy tank; 4. opening the buoyancy tank; 5. a gas delivery conduit; 6. and a guide post.
Detailed Description
The following describes the embodiments of the present invention with reference to the drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in FIG. 1, the machining process of the ultra-low temperature stainless steel forging for the L NG equipment comprises the following steps:
s1: blanking; then the blank is sent to a heating furnace to be heated, then a riser and a nozzle end are cut off, the riser section is cut off by 15-20%, and the nozzle end is cut off by 6-8%;
s2: the blank is sent to a heating furnace for heating before forging, and the initial forging temperature and the terminal temperature are ensured to be within the range of 1000-1200 ℃;
s3: the blank is sent to a forging procedure for preforming and final forming of the blank membrane forging;
s4: air cooling;
s5: the forging after will air cooling handles carries out the pickling again, with the stainless steel forging hoist to the pickling bath 2 in the aquatic automatic rising platform on, the aquatic automatic rising platform including be frame construction crane 1, fixed set up in a plurality of hollow sealed flotation tanks 3 and hollow opening flotation tanks 4 of crane 1 bottom, a plurality of sealed flotation tanks 3 and opening flotation tanks 4 crisscross the setting each other, the trompil that is linked together rather than the inner chamber is seted up to the bottom of opening flotation tanks 4, be provided with gas transmission pipeline 5 on the crane 1, gas transmission pipeline 5 respectively through a plurality of gas pipelines with the cavity of opening flotation tanks 4 is linked together, the storage of sealed flotation tanks 3 has compressed gas, gas transmission pipeline 5 is connected with compressed gas source through automatic valve, be provided with the timer on the automatic valve, still be provided with the bleed valve on the gas transmission pipeline 5, hoisting the stainless steel forging onto the lifting frame 1 and fixing the stainless steel forging by the positioning clamp on the lifting frame 1, opening the air release valve to discharge the compressed gas in the open buoyancy tank 4, automatically sinking the lifting frame 1 to the bottom of the pickling tank 2, and closing the air release valve;
s6: setting pickling time on a timer of the automatic valve according to a pickling process, wherein hydrochloric acid with the concentration of 28-30% and a corrosion inhibitor are arranged in the pickling tank 2;
s7: when the set pickling time is reached, the automatic valve is automatically opened, the compressed gas source fills the compressed gas into the opening buoyancy tank 4, the lifting frame 1 rises until the flange is exposed out of the pickling tank 2, and the flange after pickling is lifted away from the lifting frame 1;
s8: machining the forged piece subjected to acid pickling to obtain a flange;
s9: and (5) packaging and warehousing the workpiece.
The preferred implementation mode in the inner embodiment is further improved as follows: be provided with guide structure between crane 1 and pickling bath 2, guide structure including set up in the guide post 6 in 2 four bights of pickling bath, 6 vertical extensions of guide post, seted up on the crane 1 with 6 matched with guiding holes of guide post.
The preferred implementation mode in the inner embodiment is further improved as follows: the corrosion inhibitor is one or a mixture of more of chromate, nitrite, silicate, molybdate, tungstate, polyphosphate and zinc salt.
In order to control the temperature in the pickling tank 2 and ensure the accuracy of the pickling process, the lifting frame 1 is provided with a temperature probe and a heater, and the temperature probe is connected with a controller of the heater.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are included to illustrate the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (4)
1. A machining process of an ultralow-temperature stainless steel forging for L NG equipment is characterized by comprising the following steps of:
s1: blanking; then the blank is sent to a heating furnace to be heated, then a riser and a nozzle end are cut off, the riser section is cut off by 15-20%, and the nozzle end is cut off by 6-8%;
s2: the blank is sent to a heating furnace for heating before forging, and the initial forging temperature and the terminal temperature are ensured to be within the range of 1000-1200 ℃;
s3: the blank is sent to a forging procedure for preforming and final forming of the blank membrane forging;
s4: air cooling;
s5: the forging after the air cooling treatment is further pickled, the stainless steel forging is hoisted to an automatic water lifting platform in a pickling tank, the automatic water lifting platform comprises a lifting frame which is of a frame structure, a plurality of hollow sealed floating boxes and hollow opening floating boxes which are fixedly arranged at the bottom of the lifting frame, the sealed floating boxes and the opening floating boxes are arranged in a staggered mode, the bottom of each opening floating box is provided with an open hole communicated with the inner cavity of the opening floating box, a gas conveying pipeline is arranged on the lifting frame and is respectively communicated with the cavities of the opening floating boxes through a plurality of branch gas pipelines, compressed gas is compressed in the sealed floating boxes, the gas conveying pipeline is connected with a compressed gas source through an automatic valve, a timer is arranged on the automatic valve, and a gas release valve is further arranged on the gas conveying pipeline, hoisting the stainless steel forging onto the lifting frame and fixing the stainless steel forging by the positioning clamp on the lifting frame, opening the air release valve to discharge the compressed gas in the open buoyancy tank, automatically sinking the lifting frame to the bottom of the pickling tank, and closing the air release valve;
s6: setting pickling time on a timer of the automatic valve according to a pickling process, wherein hydrochloric acid with the concentration of 28-30% and a corrosion inhibitor are contained in the pickling tank;
s7: when the set pickling time is reached, the automatic valve is automatically opened, the compressed gas source fills compressed gas into the opening buoyancy tank, the lifting frame rises until the flange is exposed out of the pickling tank, and then the flange after pickling is lifted away from the lifting frame;
s8: machining the forged piece subjected to acid pickling to obtain a flange;
s9: and (5) packaging and warehousing the workpiece.
2. The processing technology of the L NG ultralow-temperature stainless steel forging for the equipment, as claimed in claim 1, is characterized in that a guide structure is arranged between the lifting frame and the pickling bath, the guide structure comprises guide posts arranged at four corners of the pickling bath, the guide posts extend vertically, and the lifting frame is provided with guide holes matched with the guide posts.
3. The processing technology of the ultralow temperature stainless steel forging for the L NG equipment, as recited in claim 1, wherein the corrosion inhibitor is one or a mixture of more of chromate, nitrite, silicate, molybdate, tungstate, polyphosphate and zinc salt.
4. The processing technology of the ultralow-temperature stainless steel forging for the L NG equipment as claimed in claim 1, wherein the lifting frame is provided with a temperature probe and a heater, and the temperature probe is connected with a controller of the heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810687663.3A CN108754519B (en) | 2018-06-28 | 2018-06-28 | Machining process of ultralow-temperature stainless steel forging for L NG equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810687663.3A CN108754519B (en) | 2018-06-28 | 2018-06-28 | Machining process of ultralow-temperature stainless steel forging for L NG equipment |
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| Publication Number | Publication Date |
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| CN108754519A CN108754519A (en) | 2018-11-06 |
| CN108754519B true CN108754519B (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810687663.3A Active CN108754519B (en) | 2018-06-28 | 2018-06-28 | Machining process of ultralow-temperature stainless steel forging for L NG equipment |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716642A (en) * | 2009-11-10 | 2010-06-02 | 东风汽车有限公司 | Forming method of car steering knuckle forging die cavity |
| CN104611712B (en) * | 2015-01-19 | 2017-08-29 | 邢台钢铁有限责任公司 | 400 be stainless steel hot-rolling annealing wire rod hydrochloric acid pickler and acid washing method |
| CN104862615B (en) * | 2015-03-31 | 2017-03-15 | 无锡市华尔泰机械制造有限公司 | A kind of production technology of S31803 two-phase stainless steel flange |
| CN106078090B (en) * | 2016-06-20 | 2018-05-08 | 安徽省瑞杰锻造有限责任公司 | A kind of forging technology of large axis forging |
| CN106703453B (en) * | 2017-02-28 | 2022-03-29 | 江阴四方游泳康复产业股份有限公司 | Underwater lifting platform |
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