CN102010962A - Producing technology of steel tube - Google Patents
Producing technology of steel tube Download PDFInfo
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- CN102010962A CN102010962A CN2010105678728A CN201010567872A CN102010962A CN 102010962 A CN102010962 A CN 102010962A CN 2010105678728 A CN2010105678728 A CN 2010105678728A CN 201010567872 A CN201010567872 A CN 201010567872A CN 102010962 A CN102010962 A CN 102010962A
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Abstract
The invention relates to a producing technology of a steel tube, comprising the following steps: (1) stripping the outer layer of a steel rod and then delivering the steel rod without the outer layer on hot piercing equipment for piercing so as to manufacture a pierced billet; (2) carrying out thermal treatment on the pierced billet; (3) acid cleaning; (4) carrying out rust prevention treatment; (5) carrying out the first cold rolling; (6) carrying out the second cold rolling; (7) carrying out finish rolling; and (8) soaking the intermediate product subjected to the acid cleaning in the step (7) in a boiled hot water vat, then taking the intermediate product out of the hot water vat, fast evaporating the intermediate product until the intermediate product is dry, and then neutralizing by a neutralization liquid at room temperature. The product produced by the steel rod has the advantages of high-temperature and corrosion resistance and high strength, does not generate scale cinder easy to strip and the like below the temperature of 1082 DEG C, and can be used for producing a combustor, a car exhaust pipe and the like. The whole steel pipe material manufactured by the technology in the invention has the advantages of compression resistance and corrosion resistance.
Description
Technical field
The present invention relates to the production technique of metallurgy industry stainless-steel seamless pipe.
Background technology
Stainless steel is the general name of stainless steel, high temperature steel, duriron.Stainless steel can be divided into two big classes by composition, and a class is to contain chromium at the simple chromium steel more than 1 2%, and another kind of is the steel that adds other element on the basis of the simple chromium steel of the sub-mechanics of chrome content more than 12% again.
The chromium carbide that is combined into based on carbon and chromium can reduce stainless corrosion resistant performance, so stainless carbon content is lower, general carbon content is no more than 0.4% in 0.1～0.2% scope.
Based on China's nickel resources and stainless steel steel scrap resource shortage characteristics, enlarging the kind of ferritic stainless steel and produce proportion should be one of direction of China's stainless steel breed structure adjustment.Compare with 304 type austenitic stainless steels, the raw materials cost of the ferritic stainless steel of no nickel is lower, and the low advantage of the thermal expansivity that has.In ferritic stainless steel, add alloys such as niobium, titanium, can form stable carbide, the significant quantity of chromium is retained in the matrix, improve the solidity to corrosion of steel and the anti-grain boundary corrosion of welding node, alloy additions such as an amount of niobium, titanium can improve the atmospheric corrosion resistance of steel greatly, plasticity (deep drawing quality), high-temperature behavior.
Summary of the invention
The purpose of this invention is to provide a kind of whole carrying capacity height, anticorrosive steel pipe production technique.
For solving the problems of the technologies described above, the present invention takes following technical scheme: a kind of production technology of steel tube may further comprise the steps:
(1) thus deliver on the hot piercing equipment perforation after the skin of round steel peelled off and make hollow forging, accumulation 6～10 hours naturally then;
(2) tempering under 800-830 ℃ temperature of described hollow forging is packed into be used for the softening heat treatment furnace of handling, be heated to 850～900 ℃ then, and 790-820 ℃ of insulation 4 hours down, natural air cooling is more than 6 hours then;
(3) adopting mass percent is that the water that 15～20% hydrochloric acid, 1%～2% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment to the hollow forging of handling through step (2);
(4) hollow forging after step (3) processing is carried out antirust processing;
(5) use cold-rolling mill with described step (4) thus the hollow forging of handling carries out the cold rolling centre product that make first time, then successively to these centre product deoil, thermal treatment, aligning and cleanup acid treatment;
(6) it is cold rolling to use cold-rolling mill to carry out second time to product in the middle of after the cleanup acid treatment of described step (5), and to the second time cold rolling centre product take turns doing deoil, thermal treatment, aligning and cleanup acid treatment;
(7) product in the middle of after the cleanup acid treatment of described step (6) are carried out finish rolling, then the centre product after the finish rolling are taken turns doing deoil, thermal treatment, aligning and cleanup acid treatment;
(8) will be immersed in the ebullient boiling water cylinder and soak through product in the middle of after the cleanup acid treatment of described step (7), and then it be taken out from the boiling water cylinder, the quick evaporate to dryness of centre product that will take out then at room temperature neutralizes with neutralizer then.
Further, deoiling in described step (5), (6), (7) at least one step handled and to be: functional quality per-cent is that 15%～20% hydrochloric acid and 1%～2% nitric acid deoil, and the time of deoiling is 30～60 minutes.
Further, heat treatment step in the described step (5) is as follows: product are packed in 790-830 ℃ the heat treatment furnace and are heated to 830-870 ℃ in the middle of after handling deoiling in the described step (5), rotating speed with 50～60 rev/mins during heating turns round this heat treatment furnace, be incubated 60～70 minutes then under 790-830 ℃ temperature, air cooling is more than 5 hours then.
Further, heat treatment step in the described step (6) is as follows: will put into 790-830 ℃ heat treatment furnace and be heated to 830-870 ℃ through product in the middle of handling through deoiling in the step (6), and under 790-830 ℃ condition, being incubated 50-60 minute, air cooling is more than 4.5 hours then.
Further, heat treatment step in the described step (7) is as follows: will be through product in the middle of handling through deoiling in the step (7) in the temperature of packing into is 780 ℃ heat treatment furnace, be heated to 820-850 ℃, and be incubated 65～75 minutes down at 770-800 ℃, air cooling is more than 4 hours then.
Further, cleanup acid treatment in described step (5), (6), (7) at least one step is: adopting mass percent is that the water that 15～20% hydrochloric acid, 2%～3% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment, and the treatment time is 30-60 minute.
The product of this steel grade production has high-temperature corrosion resistance, advantages of high strength, not producing advantages such as flaky oxide skin below 1082 ℃, can be used for making the combustion chamber, automobile exhaust pipe etc.Adopt that this technology invention makes the whole carrying capacity, anticorrosive of tube material.
Description of drawings
Fig. 1 is the process flow sheet of the production technology of steel tube among the present invention.
Fig. 2 is the production technique heat treating regime table among the present invention.
Embodiment
Below technical scheme of the present invention is elaborated.
Fig. 1 shows the process flow sheet of the production technology of steel tube among the present invention, and Fig. 2 further shows the heat treating regime table.Shown in Fig. 1-2, the production technology of steel tube among the present invention may further comprise the steps:
(1) delivers on the hot piercing equipment after the skin of round steel is peelled off and bore a hole.Preferably, be that the skin of the round steel of φ 65 is peelled off 1.5～2mm with diameter, boring a hole into external diameter then is that 67mm, wall thickness are the hollow forging of 5mm, piles up 6～10 hours naturally then.After the punch off, the temperature difference of coming out of the stove when described hot piercing equipment is come out of the stove can not be less than 25 ℃, if less than 25 ℃ then put into haybox cooking more than 4 hours.In addition, melt length must reach more than the 13500mm.Preferably, the piercing temperature of described perforation is at 1190～1230 ℃.
(2) tempering under 800-830 ℃ temperature of described hollow forging is packed into be used for the softening heat treatment furnace of handling, be heated to 850～900 ℃ then, make described heat treatment furnace with the revolution of 30-40 rev/min rotating speed when heating simultaneously, and under 790-820 ℃, be incubated 4 hours, natural air cooling became rust up to surface color more than 6 hours then.
(3) pickling: promptly adopting mass percent is that the water that 15～20% hydrochloric acid, 1%～2% nitric acid and ferrous content are 200 grams per liters carries out surface treatment to the hollow forging of handling through step (2), at room temperature handles 30-60 minute.
(4) antirust processing: used rust oil immersion bubble 5 minutes.
(5) use cold-rolling mill that the hollow forging of described step (4) processing is cold rolling: described external diameter is served described cold-rolling mill as the 67mm wall thickness as the hollow forging of 5mm, the plug that uses described cold-rolling mill with described external diameter as the 67mm wall thickness as the hollow forging of 5mm be rolled into external diameter as the 38mm wall thickness be 2.5mm in the middle of product, the rotating speed of described cold-rolling mill is 700-750 rpm, and the feed of whenever rolling once is 5mm.
Described step (5) further comprises following post-processing step:
(a) product in the middle of described are deoiled: the hydrochloric acid of use 15%～20% and 1%～2% nitric acid deoil, and the time of deoiling is 30～60 minutes;
(b) after described step (a) is handled in the middle of product heat-treat: the centre product after described step (a) is handled are packed in 790-830 ℃ the heat treatment furnace, be heated to 830-870 ℃, rotating speed with 50～60 rev/mins during heating turns round this heat treatment furnace, and under 790-830 ℃ temperature, being incubated 60～70 minutes, air cooling is more than 5 hours then; The come out of the stove temperature difference of insulation when coming out of the stove must not be less than 25 ℃, as are lower than 25 ℃ and then are put in haybox cooking more than 4 hours.Melt length must reach more than the 13500mm.
(c) the middle product after described step (b) thermal treatment are served the straightener aligning.
(d) carry out pickling to described through product in the middle of step (c) straightening processing: promptly adopting mass percent is that the water that 15～20% hydrochloric acid, 1%～2% nitre and ferrous content are 200 grams per liters was at room temperature handled 30-60 minute.
(6) after the step (c) of described step (5) is handled in the middle of product use rolled by cold rolling machine, will be after step (5) be handled in the middle of product to be rolled into external diameter be the middle product of 1.8mm for the 22mm wall thickness.
Described step (6) further comprises following post-processing step:
(i) to deoiling through product in the middle of after step (6) cold-rolling treatment: promptly using mass percent is that 15%～20% hydrochloric acid and 1%～2% nitric acid deoil, and the time of deoiling is 30～60 minutes.
Product are heat-treated in the middle of (ii) handling deoiling through step (i): the product temperature of packing into is in 790-830 ℃ the heat treatment furnace in the middle of after will be through step (6) cold rolling, be heated to 830-870 ℃, and under 790-830 ℃ condition, being incubated 50-60 minute, the rotating speed of described heat treatment furnace is 60～70 rev/mins during heating; Air cooling is more than 4.5 hours then; The come out of the stove temperature difference of insulation when coming out of the stove must not be less than 25 ℃, as be lower than 25 ℃ be put in haybox cooking more than 4 hours.Melt length must reach more than the 13500mm.
(iii) with described step (ii) after the thermal treatment in the middle of product serve straightener and align.
(iv) to described through step (iii) straightening processing in the middle of product carry out pickling: the employing mass percent is that the water that 15～20% hydrochloric acid, 1%～2% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment, and the treatment time is 30-60 minute.
(7) product finish rolling in the middle of after the use cold-rolling mill is (iv) handled step, making external diameter is that 19.05mm, thickness are the middle product of 1.65mm.
Described step (7) further comprises following post-processing step:
(I) to deoiling through product in the middle of step (7) finish rolling: functional quality per-cent is that 15%～20% hydrochloric acid and 1%～2% nitric acid deoiled 30～60 minutes.
(II) after step (I) is handled in the middle of product heat-treat: the centre product that are about to external diameter and are 19.05mm, thickness and the be 1.65mm temperature of packing into is in 780 ℃ the heat treatment furnace, be heated to 820-850 ℃, and under 770-800 ℃, be incubated 65～75 minutes, preferably, the rotating speed of this heat treatment furnace is 60-80 rev/min during heating, air cooling is more than 4 hours then, becomes rust up to the surface color of centre product.
(III) the middle product after described step (II) thermal treatment are served the straightener aligning.
(IV) carry out pickling to described through product in the middle of step (III) straightening processing: the employing mass percent is that the water that 15～20% hydrochloric acid, 2%～3% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment, and the treatment time is 30-60 minute.
(8) antirust neutralizing treatment: will through described step (IV) handle in the middle of product be immersed in the ebullient boiling water cylinder and soak, then it is taken out from the boiling water cylinder, the quick evaporate to dryness of centre product that will take out then, then with neutralizer at room temperature in and 2～5 minutes.The excellent ground that moves, described neutralizer is a sodium carbonate solution, the mass percent concentration of its yellow soda ash is 5～10%.
The product of this steel grade production has high temperature corrosion, characteristics that intensity is high, not producing the advantages such as flaky oxide skin below 1082 ℃, can be used for making the combustion chamber, automobile exhaust pipe etc. Adopt that this technology invention makes the whole compression resistance, anticorrosive of tube material.
Claims (6)
1. production technology of steel tube may further comprise the steps:
(1) thus deliver on the hot piercing equipment perforation after the skin of round steel peelled off and make hollow forging, accumulation 6～10 hours naturally then;
(2) tempering under 800-830 ℃ temperature of described hollow forging is packed into be used for the softening heat treatment furnace of handling, be heated to 850～900 ℃ then, and 790-820 ℃ of insulation 4 hours down, natural air cooling is more than 6 hours then;
(3) adopting mass percent is that the water that 15～20% hydrochloric acid, 1%～2% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment to the hollow forging of handling through step (2);
(4) hollow forging after step (3) processing is carried out antirust processing;
(5) use cold-rolling mill with described step (4) thus the hollow forging of handling carries out the cold rolling centre product that make first time, then successively to these centre product deoil, thermal treatment, aligning and cleanup acid treatment;
(6) it is cold rolling to use cold-rolling mill to carry out second time to product in the middle of after the cleanup acid treatment of described step (5), and to the second time cold rolling centre product take turns doing deoil, thermal treatment, aligning and cleanup acid treatment;
(7) product in the middle of after the cleanup acid treatment of described step (6) are carried out finish rolling, then the centre product after the finish rolling are taken turns doing deoil, thermal treatment, aligning and cleanup acid treatment;
(8) will be immersed in the ebullient boiling water cylinder and soak through product in the middle of after the cleanup acid treatment of described step (7), and then it be taken out from the boiling water cylinder, the quick evaporate to dryness of centre product that will take out then at room temperature neutralizes with neutralizer then.
2. production technology of steel tube as claimed in claim 1, it is characterized in that: deoiling in described step (5), (6), (7) at least one step handled and to be: functional quality per-cent is that 15%～20% hydrochloric acid and 1%～2% nitric acid deoil, and the time of deoiling is 30～60 minutes.
3. production technology of steel tube as claimed in claim 1, it is characterized in that: the heat treatment step in the described step (5) is as follows: product are packed in 790-830 ℃ the heat treatment furnace and are heated to 830-870 ℃ in the middle of after handling deoiling in the described step (5), rotating speed with 50～60 rev/mins during heating turns round this heat treatment furnace, be incubated 60～70 minutes then under 790-830 ℃ temperature, air cooling is more than 5 hours then.
4. production technology of steel tube as claimed in claim 1, it is characterized in that: the heat treatment step in the described step (6) is as follows: will put into 790-830 ℃ heat treatment furnace and be heated to 830-870 ℃ through product in the middle of handling through deoiling in the step (6), and under 790-830 ℃ condition, being incubated 50-60 minute, air cooling is more than 4.5 hours then.
5. production technology of steel tube as claimed in claim 1, it is characterized in that: the heat treatment step in the described step (7) is as follows: will be through product in the middle of handling through deoiling in the step (7) in the temperature of packing into is 780 ℃ heat treatment furnace, be heated to 820-850 ℃, and under 770-800 ℃, being incubated 65～75 minutes, air cooling is more than 4 hours then.
6. production technology of steel tube as claimed in claim 1, it is characterized in that: the cleanup acid treatment in described step (5), (6), (7) at least one step is: adopting mass percent is that the water that 15～20% hydrochloric acid, 2%～3% nitric acid and ferrous content are 200 grams per liters at room temperature carries out surface treatment, and the treatment time is 30-60 minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105678728A CN102010962A (en) | 2010-12-01 | 2010-12-01 | Producing technology of steel tube |
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| CN2010105678728A CN102010962A (en) | 2010-12-01 | 2010-12-01 | Producing technology of steel tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480280A (en) * | 2016-10-14 | 2017-03-08 | 常州市联谊特种不锈钢管有限公司 | The production technology of cylinder stainless steel tube |
| CN111451313A (en) * | 2020-04-13 | 2020-07-28 | 四川远方高新装备零部件股份有限公司 | Method for processing low-activation martensitic steel C L F-1 steel pipe |
| CN115478224A (en) * | 2022-09-28 | 2022-12-16 | 江苏金迪特钢有限公司 | High-temperature-resistant corrosion-resistant seamless steel pipe and preparation method thereof |
-
2010
- 2010-12-01 CN CN2010105678728A patent/CN102010962A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106480280A (en) * | 2016-10-14 | 2017-03-08 | 常州市联谊特种不锈钢管有限公司 | The production technology of cylinder stainless steel tube |
| CN111451313A (en) * | 2020-04-13 | 2020-07-28 | 四川远方高新装备零部件股份有限公司 | Method for processing low-activation martensitic steel C L F-1 steel pipe |
| CN115478224A (en) * | 2022-09-28 | 2022-12-16 | 江苏金迪特钢有限公司 | High-temperature-resistant corrosion-resistant seamless steel pipe and preparation method thereof |
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Application publication date: 20110413 |