CN101372020A - Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater - Google Patents
Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater Download PDFInfo
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Abstract
The invention provides a method for preparing a U-shaped seamless steel pipe of a high-pressure feed water heater, relating to the high-pressure feed water heater. The method comprises the steps: the preparation of raw material pipes; the raw material pipes are unceasingly colddrawn by a cold drawing device to form middle parison pipes with the external diameter of 38 plus and minus 0.40mm and the thickness of 2.95 plus and minus 0.3mm; the middle parison pipes are further colddrawn by the cold drawing device to form middle semi-finished products pipes with the external diameter of 30-32mm and the thickness of 3.00-3.80mm; the middle semi-finished products pipes are colddrawn by a ring hole pattern mold and the cold drawing device to form finished products with the external diameter of 16-19mm, the thickness of 1.7-3.0mm and the length of 12-35mm; the finished products are bended into U-shaped pipes by a bent pipe mold; stressrelieving is carried out on the elbow parts of the U-shaped pipes; rust prevention treatment is carried out on the U-shaped pipes, and then U-shaped pipes are packed. The average yield stress of the high tension test of a gawga pipe prepared by the invention is 340MPa; the average tensile strength is 530MPa; the average unit extension is 36.7%; the invention totally meets the use demand of a high-pressure feed water heater and has the advantages of low cost, high performance.
Description
Technical field
The present invention relates to high-pressure feed-water heater, more particularly, relate to a kind of material of the U-shaped seamless steel pipe that is mainly used in the preparation high-pressure feed-water heater and with the Gao Jiaguan of this material preparation and preparation thereof, packing method.
Background technology
High-pressure feed-water heater is a requisite key equipment in the large-scale thermal power machine group steam-water circulation system, and its effect is the feedwater that utilizes the Steam Heating after doing work to enter boiler, thereby improves unit efficiency, cuts down the consumption of energy, and reduces discharging, the protection environment.The U-shaped pipe is the pressure boundary of realizing heat exchange, is the core component of decision high-pressure feed-water heater performance.Along with national energy-saving and emission-reduction, protection environment requirement increase and power industry day by day; especially the fast development of thermoelectricity industry; overcritical, the ultra supercritical unit of big capacity, high parameter have become the developing direction of current thermal power generation unit, and the demand of high pressure U shape tube increases day by day.This class U-shaped Gao Jiaguan is monopolized by fewer companies at present, cost an arm and a leg, and production capacity is low, and imported product exists the delivery cycle than problems such as length simultaneously, has seriously restricted China's thermoelectricity industrial expansion scale and speed.
Manufacturer's desire of high-pressure feed-water heater adopts the U-shaped seamless pipe import substitutes of domestic production for this reason, but prepare U-shaped seamless pipe common used material SA556 C2 at present, there is the unsettled shortcoming of mechanical property in the content range broad of its C and Mn (C≤0.30%, Mn:0.29～1.06%).When C≤0.15%, the intensity of high pressure U shape tube is low excessively, does not reach instructions for use; When C 〉=0.27%, the intensity of material is too high, and plasticity is relatively poor, and processing and welding difficulty are big.The content range of Mn is wide simultaneously, can bring similar consequence equally.Present in addition high pressure U shape tube adopts cold-drawing technology mostly in the straight tube manufacture process, because what this technology applied pipe fitting is simple longitudinal tension stress, pipe fitting easily produces various defectives in deformation process, its dimensional accuracy and surface quality are all not high, and length of straight pipe also has limitation simultaneously.Tube wall is blocked up so the high pressure U shape tube of selecting for use SA556 C2 material to make through cold-drawing technology exists mostly, caliber is thick, length is not enough, size U-shaped curved arc position precisely reaches shortcomings such as surface quality is relatively poor inadequately, therefore how to provide overlength that a kind of mechanical property meets instructions for use and stable performance, ultra-thin and bend part be the excessive high pressure U shape seamless steel pipe of semi arch be among the present invention the creator grind wound motivation place.
Chinese patent ZL200310113100.7, " U-shaped gapless stainless steel tube and processing technology thereof ", the material that uses is austenitic stainless steel, its shaping processing technology and steel-tube construction and this patent have similarity, but because of the material difference, Technology for Heating Processing is then different fully, and it mainly uses low pressure and corrosion-resistant field, and this patent product then is used for high temperature, hyperbaric environment.
In view of this, applicant among the present invention relies on it to be engaged in the practice and the experience of relevant industries for many years, successful relevant patent (" U-shaped gapless stainless steel tube and processing technology thereof ", patent No. ZL200310113100.7) of applying for, annular distance pattern tool is cold rolling by cooperating, interference radially adds the processing technology that is pressed into U-shaped, can produce the U-shaped gapless stainless steel tube that is applicable to various low-pressure feed heaters; In view of height adds the specific (special) requirements of feed-water heater with seamless steel pipe, and the best combination of considering properties of product and production cost, through concentrating on studies and developing, design a kind of high tube material that adds, C and Mn content are controlled at more close limit, have both guaranteed its mechanical property, help processing and welding again; Limit hazardous elements S, P content simultaneously, prevented separating out of MnS field trash, improved the degree of purity of steel pipe.Adopt cold-drawn and the cold rolling cold machining process that combines simultaneously, surface quality, the dimensional accuracy of high pressure U shape tube straight tube have been guaranteed, and length of straight pipe is increased greatly, utilize bent pipe mold and adopt radially pressurization of interference, produce the seamless Gao Jiaguan of U-shaped that overlength, thin-walled and bend part are the semi arch transition, and design special technology of the package in conjunction with the characteristics of aspects such as the material of the seamless Gao Jiaguan of U-shaped, profile.
Summary of the invention
One of main purpose of the present invention is to provide a kind of material for preparing high pressure U shape tube.
One of main purpose of the present invention also is to provide a kind of high pressure U shape tube that uses the above-mentioned material preparation.
Another object of the present invention is to provide a kind of preparation method who uses the high pressure U shape tube of above-mentioned material preparation.
Another object of the present invention also is to provide a kind of packing method of using the high pressure U shape tube of above-mentioned material preparation.
A kind of material that is used to prepare high pressure U shape tube is characterized in that: press mass fraction and calculate, comprise following component: 0.15～0.27% C, 0.17～0.50% Si, 0.50～1.06% Mn ,≤0.25% Cr ,≤0.15% Mo, ≤ 0.08% V, ≤ 0.25% Ni ,≤0.20% Cu ,≤0.030% P, ≤ 0.030% S, surplus is Fe.
The processing technology that adopts above-mentioned material to be prepared into mother tube is conventional hot piercing process, sees two China chief editors far away " modern seamless steel tube production technology " (Chemical Industry Press, 2008) for details.
Utilize the high pressure U shape seamless steel pipe of above-mentioned material preparation, it is characterized in that: by mother tube earlier through cold-drawn repeatedly after annular distance pattern tool once cold rolling, radially shape after being full of, the seamless Gao Jiaguan of this U-shaped cross section everywhere all is the circular of sealing or approximate circle ring-type, and wall thickness is between 1 to 4 millimeter, external diameter of pipe is between 12 to 32 millimeters, and described U-shaped height adds length after pipe launches between 12 to 35 meters.
The preparation method of high pressure U shape seamless pipe among the present invention includes the following step:
1) preparation of mother tube;
2) by cold-draw equipment mother tube is cold drawing to external diameter of pipe continuously at 38 ± 0.40 millimeters, the wall thickness intermediate blank pipe at 2.95 ± 0.3 millimeters;
3) by cold-draw equipment with step 2) in the further cold-drawn of intermediate blank pipe finished to external diameter of pipe in 30～32 millimeters, wall thickness middle semi-finished product at 3.00～3.80 millimeters;
4) with the middle semi-finished product finished in the step 3) via annular distance pattern tool and cold-rolling equipment be cold-rolled to external diameter of pipe at 16 to 19 millimeters, wall thickness 1.7～3.0 millimeters, the finished-product straight pipe of length between 12 to 35 meters, in this process in the middle of semi-finished product
Percentage elongation between pipe and the finished-product straight pipe reaches between 2.45 to 2.97;
5) utilize bent pipe mold that the finished-product straight pipe of finishing in the step 4) is curved the U-shaped pipe;
6) bend part to the U-shaped pipe in step 5) carries out destressing heat treatment;
7) to carrying out antirust processing in the immersion of the U-shaped pipe after the step 6) aqueous rustproof liquid, pack then; The active ingredient of aqueous rustproof liquid is soap.
In addition, utilizing cold-draw equipment to cooperate internal mold to come directly towards described step 2) carries out twice cold-drawn continuously, progressively reduces outer diameter of steel pipes, reduces its wall thickness.
In addition, described step 2) back is to the heat treatment of annealing of described intermediate blank pipe, aligns after the heat treatment, pickling, phosphatization, saponification handle.
In addition, utilize cold-draw equipment to step 2 in the described step 3)) after the intermediate blank pipe carry out empty sinking, reduce outer diameter of steel pipes, increase its wall thickness.
In addition, to the heat treatment of annealing of described middle semi-finished product, align after the heat treatment, pickling, neutralization, Passivation Treatment after the described step 3).
In addition, utilize multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 4) is deoiled and cleaning, adopt to soak the fiber cloth of acetone, and by the pressure of high pressure air rifle (〉=4MP), advance fiber cloth to pass the multifrequency time wiping technology of finished-product straight pipe inside.
In addition; to deoil through described step 4) and cleaning after finished-product straight pipe carry out the protective atmosphere brightness heat treatment; this protective atmosphere brightness heat treatment adopts ammonia to decompose back nitrogen and hydrogen volume mist than 1:3, aligns after the brightness heat treatment, antirust processing.
In addition, utilize bent pipe mold in the described step 5) and adopt interference radially pressurization make the finished-product straight pipe of finishing through step 4) curve the U-shaped pipe, and be the semi arch transition at bend part.
In addition, adopt the heating of intermediate frequency contact to carry out destressing heat treatment to the bend part of the seamless Gao Jiaguan of U-shaped in the described step 6), heat treatment temperature 〉=600 ℃.
In addition, the seamless height of U-shaped after the antirust processing adds pipe and utilizes comb type support to carry out layering esting case dress according to differently curved radius in the described step 7).
Seamless high pressure U shape tube among the present invention is mainly used in the high-pressure feed-water heater in the power station steam turbine subsidiary engine, it is little to have bore, dimension is long, tube wall thin and evenly, bend part becomes features such as semi arch transition, meets the instructions for use of high-pressure feed-water heater on the performance fully.
The present invention has researched and developed the new material of high-pressure feed-water heater, not only greatly reduces the manufacturing cost of high-pressure feed-water heater, has improved performance simultaneously; Adopt the cold-rolling mill and the annular distance pattern tool of lengthening, solved the processing difficult problem of overlength, tiny steel pipe, the cold rolling finished-product straight pipe that goes out overlength, tiny, wall thin feature; Utilize bent pipe mold and adopt radially pressurization of interference, eliminated the bounce-back influence of seamless high pressure U shape tube well, and made seamless high pressure U shape tube elbow cross section everywhere all be the circular of sealing or approximate circle ring-type; Employing has improved U-shaped plumber skill and mechanical property to the protective atmosphere brightness heat treatment of finished-product straight pipe and the local destressing heat treatment of minor radius bend pipe, and helps the applying better when expanded joint and between the high-pressure feed-water heater tube sheet of U-shaped pipe; Adopt antirust processing, prevent the corrosion of tubing in production flow and transportation, do not influence pipe-pipe sheet simultaneously and seal welding; Utilize the pectination support that the U-shaped height is added pipe layering esting, improved packed bulk density greatly, avoided the damage in the transportation, make things convenient for user installation simultaneously.
Description of drawings
Fig. 1 is the structure flow chart of the seamless Gao Jiaguan of U-shaped among the present invention
Fig. 2 is the process schematic representation of the seamless Gao Jiaguan of U-shaped among the present invention
Fig. 3 is the structural representation of the seamless Gao Jiaguan of U-shaped bend pipe mould in bent tube technique among the present invention
Fig. 4 is the cross-sectional schematic of the seamless Gao Jiaguan of U-shaped bend pipe mould in bent tube technique among the present invention
Fig. 5 is the seamless Gao Jiaguan of U-shaped schematic top plan view behind the esting in technology of the package among the present invention
Fig. 6 is the seamless Gao Jiaguan of U-shaped cross-sectional schematic behind the esting in technology of the package among the present invention
Numeral is represented respectively among the figure:
1. finished product high pressure U shape tube 2. bent pipe molds 3. wooden cases 4. plastic sheeting 5.VPI films 6. sealed polyethylene plastics 7. parting beads 8. cushion blocks 9. foam styrenes
The specific embodiment:
Below in conjunction with accompanying drawing the specific embodiment among the present invention is described in further details.
Select for use raw material to calculate in the example, comprise following key component: 0.19% C, 0.23% Si, 0.91% Mn, 0.013% P by mass fraction, 0.004% S, 0.25% Cr, 0.05% Mo, 0.04% V, 0.20% Ni, 0.10% Cu,, surplus is Fe.
As shown in Figure 2, the external diameter of pipe after high pressure U shape tube 1 is shaped among the present invention is between 12 to 32 millimeters, and wall thickness is between 1 to 4 millimeter, and the length after described U-shaped pipe launches is between 12 to 35 meters.
It is 16 ± 0.10mm, wall thickness at 2 ± 0.20mm, length small-bore, thin-walled, the seamless Gao Jiaguan of speciality U-shaped in the middle of 24 to 30m that desire is made external diameter of pipe among the present invention, can adopt following embodiment to finish.
Embodiment
As shown in Figure 1, make small-bore, thin-walled, the seamless Gao Jiaguan of speciality U-shaped comprises the following steps:
1) after the pipe that obtains Φ 51mm * 4.25mm after will boring a hole carries out back-end crop, takes the lead, smooth, pickling, phosphatization, saponification, mill repair, makes mother tube;
2) by cold-draw equipment cooperate the internal mold top with mother tube through twice cold-drawn, outer diameter of steel pipes successively is decreased to 45 ± 0.50mm and 38 ± 0.40mm, wall thickness successively is kept to 3.45 ± 0.30mm and 2.95 ± 0.30mm, makes the intermediate blank pipe;
3) to step 2) in the heat treatment of annealing of intermediate blank pipe, align after the heat treatment, pickling, phosphatization, saponification handle:
4) the further empty sinking of intermediate blank pipe after by cold-draw equipment annealed heat treatment, aligning, pickling, phosphatization, saponification being handled reduces external diameter of pipe to 30 ± 0.20mm, increases thickness of pipe wall to 3.10 ± 0.30mm, makes middle semi-finished product;
5) to after the step 4) to the heat treatment of annealing of described middle semi-finished product, align after the heat treatment, pickling, neutralization, Passivation Treatment;
6) by the middle semi-finished product of cold-rolling equipment mating holes pattern tool after to annealed heat treatment, aligning, pickling, neutralization, Passivation Treatment disposable be cold-rolled to external diameter of pipe be 16 ± 0.10mm, wall thickness in 2 ± 0.20mm, the finished-product straight pipe of length between 24 to 30m, the percentage elongation in this process between middle semi-finished product and the finished-product straight pipe can reach 2.97;
7) utilize multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 6) is deoiled and cleaning, adopt the fiber cloth of soaking acetone, and advance fiber cloth to pass finished-product straight pipe inside by means of the pressure of high pressure air rifle, can wipe the greasy dirt of finished-product straight pipe inside through wiping repeatedly, guarantee high cleaning requirement small-bore, the speciality inside pipe wall;
8) to step 7) through deoiling and cleaning after finished-product straight pipe carry out the protective atmosphere bright normalizing and handle, this protective atmosphere brightness heat treatment adopts ammonia to decompose back nitrogen and hydrogen volume mist than 1:3;
9) to through the finished-product straight pipe after the protective atmosphere brightness heat treatment, carry out straightening processing, and finished-product straight pipe is carried out antirust processing, prevent that finished-product straight pipe from corrosion taking place in production flow;
10) utilize bent pipe mold and adopt interference radially pressurization the one-tenth quality pipe after protective atmosphere brightness heat treatment, aligning, antirust processing in the step 9) is curved speciality, thin-walled, seamless U-shaped Gao Jiaguan;
11) bend part to the seamless Gao Jiaguan of U-shaped after handling through the step 10) bend pipe carries out destressing heat treatment, this heat treatment adopts intermediate frequency contact firing equipment that local heat treatmet is carried out at the return bend position, elimination bends the cold working stress that bend part produces when being shaped, general only the need handled the seamless Gao Jiaguan of the less U-shaped of bending radius, simultaneously during heating and cooling, tube cavity feeds inert gas, prevents the oxidation of the inwall thermal treatment zone;
12) the seamless Gao Jiaguan of the U-shaped after step 10 and step 11) is tested, comprise physical and chemical inspection, hydraulic test, carry out antirust processing after qualified, avoid the seamless height of finished product U-shaped to add tube-surface and in transportation, storage and device fabrication, corrosion takes place, adopt the pectination support that utilizes of independent research that the seamless height of U-shaped is added pipe layering esting technology of the package at last, improved packed bulk density greatly, both avoid the damage in the transportation, made things convenient for user installation simultaneously.
As shown in Figure 3 and Figure 4, adopt the radially pressurization mode of carrying out clod wash of interference in the present embodiment, afterwards produce the phenomenon that wrinkle and collapsible tube appear in bounce-back and short-radius bend inboard in order to prevent to bend, bent pipe mold 2 is made the radius of radius of circle less than the back bend part that is shaped, and when being shaped, adopt pressuring method, produce predeformation before making steel tube bending, with being of the required size of assurance pipe bounce-back back bend part, and the pipe that forms that bends has advantages such as surface flatness is good, wrinkle resistant line after adopting this bent pipe mold 2 and pressuring method.
As shown in Figure 5 and Figure 6, take the layering esting to be loaded in the wooden case 3 to the seamless Gao Jiaguan of finished product U-shaped in the present embodiment, be lined with plastic sheeting 4 and VPI film 5 in the case, the top of chest also should be covered with layer of polyethylene plastic sheeting 6, to prevent the pollution that pipe may be subjected to and make moist when loading and unloading, transporting and storing; All U-shaped pipe bends are placed on same direction; With one deck according to U-shaped pipe bend radius size, discharging successively from inside to outside, separate with parting bead 7 that is comb shape and cushion block 8 between adjacent pipe, so that it is extract the center from top to bottom out or during, outer or can not produce than the pipe of macrobending radius and to subside than the pipe of small-bend radius; Separate with foam styrene 9 and tank wall at the straight tube end of U-shaped pipe, and play fixation, prevent to bump in transit and influence the pipe quality.Adopt the packing method in the present embodiment, not only in transportation, reduce damage, make things convenient for user installation to use simultaneously greatly.
In sum, adding pipe expansion length of straight pipe through the seamless height of the U-shaped that adopts above-mentioned production technology to make is that 12～35m, minimum wall thickness (MINI W.) can reach 2 ± 0.20mm, elbow ovality≤5%, elbow bending radius tolerance≤1.5mm; The tension test average yield strength is 340MPa, and average tensile strength is 530Mpa, and average percentage elongation is 36.7%, meets the instructions for use of high-pressure feed-water heater fully, has low cost, high performance two-fold advantage.
In addition; though above-mentioned preferred embodiment among the present invention is described; but can not be as protection scope of the present invention; promptly should understand to one skilled in the art; do not breaking away from variation and the modification that to make equivalence under the design spirit of the present invention to it; therefore, every not breaking away from the equivalence variation of being done under the design spirit of the present invention and modification, all should think to fall into protection scope of the present invention.
Claims (10)
1. the preparation method of the U-shaped seamless steel pipe of a high-pressure feed-water heater includes the following step:
1) preparation of mother tube;
2) by cold-draw equipment mother tube is cold drawing to external diameter of pipe continuously at 38 ± 0.40 millimeters, the wall thickness intermediate blank pipe at 2.95 ± 0.3 millimeters;
3) by cold-draw equipment with step 2) in the further cold-drawn of intermediate blank pipe finished to external diameter of pipe in 30～32 millimeters, wall thickness middle semi-finished product at 3.00～3.80 millimeters;
4) with the middle semi-finished product finished in the step 3) via annular distance pattern tool and cold-rolling equipment be cold-rolled to external diameter of pipe at 16 to 19 millimeters, wall thickness 1.7～3.0 millimeters, the finished-product straight pipe of length between 12 to 35 meters, the percentage elongation in this process between middle semi-finished product and the finished-product straight pipe reaches between 2.45 to 2.97;
5) utilize bent pipe mold that the finished-product straight pipe of finishing in the step 4) is curved the U-shaped pipe;
6) bend part to the U-shaped pipe in step 5) carries out destressing heat treatment;
7) the U-shaped pipe after the step 6) is carried out antirust processing, pack then.
2. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1 is characterized in that: utilize cold-draw equipment to cooperate the internal mold top to carry out twice cold-drawn continuously described step 2), progressively reduce outer diameter of steel pipes, reduce its wall thickness.
3. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1 is characterized in that: described step 2) back is to the heat treatment of annealing of described intermediate blank pipe, aligns after the heat treatment, pickling, phosphatization, saponification handle.
4. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1 is characterized in that: utilize cold-draw equipment to step 2 in the described step 3)) after the intermediate blank pipe carry out empty sinking, reduce outer diameter of steel pipes, increase its wall thickness.
5. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1 is characterized in that: to the heat treatment of annealing of described middle semi-finished product, align after the heat treatment, pickling, neutralization, Passivation Treatment after the described step 3).
6. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1, it is characterized in that: utilize multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 4) is deoiled and cleaning, adopt the fiber cloth of soaking acetone, and by the pressure of high pressure air rifle, advance fiber cloth to pass the multifrequency time wiping technology of finished-product straight pipe inside, the pressure 〉=4MP of high pressure air rifle.
7. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1; it is characterized in that: to deoil through described step 4) and cleaning after finished-product straight pipe carry out the protective atmosphere brightness heat treatment; this protective atmosphere brightness heat treatment adopts ammonia to decompose back nitrogen and hydrogen volume mist than 1:3, aligns after the brightness heat treatment, antirust processing.
8. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1, it is characterized in that: utilize bent pipe mold in the described step 5) and adopt interference radially pressurization make the finished-product straight pipe of finishing through step 4) curve the U-shaped pipe, and be the semi arch transition at bend part.
9. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1, it is characterized in that: adopt the heating of intermediate frequency contact to carry out destressing heat treatment to the bend part of the seamless Gao Jiaguan of U-shaped in the described step 6), heat treatment temperature 〉=600 ℃.
10. the preparation method of the U-shaped seamless steel pipe of the described a kind of high-pressure feed-water heater of claim 1, it is characterized in that: the packing method of step 7) is: take the layering esting to be loaded in the wooden case (3) the seamless Gao Jiaguan of finished product U-shaped, be lined with plastic sheeting (4) and VPI film (5) in the case, the top of chest is covered with layer of polyethylene plastic sheeting (6); All U-shaped pipe bends are placed on same direction; According to U-shaped pipe bend radius size, discharging successively separates with parting bead (7) that is comb shape and cushion block (8) between adjacent pipe from inside to outside with one deck.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102278541A (en) * | 2011-07-15 | 2011-12-14 | 宜昌中南精密钢管有限公司 | Bimetallic composite pipe and preparation method |
| CN103146959A (en) * | 2013-03-14 | 2013-06-12 | 宝银特种钢管有限公司 | U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator |
| CN105127200A (en) * | 2015-09-29 | 2015-12-09 | 中国钢研科技集团有限公司 | Manufacturing method for pressurizer surge line of nuclear power plant |
| CN109731943A (en) * | 2018-12-14 | 2019-05-10 | 无锡鑫常钢管有限责任公司 | A kind of large heat exchanger over-long U-shaped stainless steel tube and its manufacturing method |
| CN109852958A (en) * | 2018-12-21 | 2019-06-07 | 南京沃尔德特钢有限公司 | A kind for the treatment of process of corrosion resistance seamless steel pipe |
| CN110778803A (en) * | 2019-10-30 | 2020-02-11 | 西安圣泰金属材料有限公司 | Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof |
| CN111451315A (en) * | 2020-06-01 | 2020-07-28 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
| CN112496105A (en) * | 2020-10-23 | 2021-03-16 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel base tube with small bending radius |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278541A (en) * | 2011-07-15 | 2011-12-14 | 宜昌中南精密钢管有限公司 | Bimetallic composite pipe and preparation method |
| CN103146959A (en) * | 2013-03-14 | 2013-06-12 | 宝银特种钢管有限公司 | U-shaped seamless nickel-chromium iron alloy heat transfer tube for nuclear steam generator |
| CN105127200A (en) * | 2015-09-29 | 2015-12-09 | 中国钢研科技集团有限公司 | Manufacturing method for pressurizer surge line of nuclear power plant |
| CN109731943A (en) * | 2018-12-14 | 2019-05-10 | 无锡鑫常钢管有限责任公司 | A kind of large heat exchanger over-long U-shaped stainless steel tube and its manufacturing method |
| CN109852958A (en) * | 2018-12-21 | 2019-06-07 | 南京沃尔德特钢有限公司 | A kind for the treatment of process of corrosion resistance seamless steel pipe |
| CN110778803A (en) * | 2019-10-30 | 2020-02-11 | 西安圣泰金属材料有限公司 | Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof |
| CN111451315A (en) * | 2020-06-01 | 2020-07-28 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
| CN111451315B (en) * | 2020-06-01 | 2021-04-09 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
| CN112496105A (en) * | 2020-10-23 | 2021-03-16 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel base tube with small bending radius |
| CN112496105B (en) * | 2020-10-23 | 2024-02-23 | 江苏隆达超合金股份有限公司 | Method for bending U-shaped nickel-based pipe with small bending radius |
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