CN115338276A - Anti-oxidation treatment method for steel pipe under non-protective atmosphere - Google Patents
Anti-oxidation treatment method for steel pipe under non-protective atmosphere Download PDFInfo
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- CN115338276A CN115338276A CN202211165037.0A CN202211165037A CN115338276A CN 115338276 A CN115338276 A CN 115338276A CN 202211165037 A CN202211165037 A CN 202211165037A CN 115338276 A CN115338276 A CN 115338276A
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- heat treatment
- steel pipe
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- pipe
- furnace
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 230000001681 protective effect Effects 0.000 title claims abstract description 20
- 238000011282 treatment Methods 0.000 title claims abstract description 12
- 230000003064 anti-oxidating effect Effects 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- 239000000446 fuel Substances 0.000 claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 230000003647 oxidation Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 description 14
- 239000000047 product Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000010301 surface-oxidation reaction Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000010622 cold drawing Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000005120 petroleum cracking Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Abstract
The invention discloses an anti-oxidation treatment method of a steel pipe under a non-protective atmosphere, which comprises the following steps: determining a theoretical mixing ratio of air and fuel for complete combustion according to the fuel of the non-protective atmosphere furnace, and taking 70-80% of the theoretical mixing ratio as an air-fuel ratio for heat treatment; determining the national standard range of the heat treatment temperature of the steel pipe according to the type of the steel pipe to be treated, and taking the interval of 0-30% in the national standard range as the heat treatment temperature range of the steel pipe; during heat treatment, the air-fuel ratio in the furnace is determined according to the air-fuel ratio, and the temperature in the furnace is controlled according to the heat treatment temperature range. The invention has the advantages of improving the oxidation degree of the surface of the pipe under the non-protective atmosphere, reducing the flaw detection omission ratio and the false alarm ratio, avoiding the burning loss of the pipe, being beneficial to improving the yield and the like.
Description
Technical Field
The invention relates to the technical field of material treatment, in particular to an anti-oxidation treatment method for a steel pipe under a non-protective atmosphere.
Background
The current manufacturing process flow of cold-drawing seamless steel tube factory is that hot-rolled rough tubes are circulated to cold-drawing (or cold-rolling) to finished product specification through several cycles of acid washing, lubrication, cold-drawing (rolling) and semi-product heat treatment, and then are put in storage after finished product heat treatment, straightening, tube cutting and inspection are qualified, wherein fluid tubes and low-medium pressure boiler tubes also need eddy current flaw detection, and high-pressure tubes, petroleum cracking tubes and high-pressure chemical fertilizer tubes also need ultrasonic flaw detection on the basis of eddy current flaw detection.
The heat treatment process needs to be completed by a heat treatment furnace, the heat treatment furnace of the prior tube mill comprises a protective atmosphere furnace and a non-protective atmosphere furnace, but the construction investment cost of the protective atmosphere furnace, the subsequent maintenance and use cost and the requirement of operators are very high, so most tube mills generally adopt the heat treatment furnace without the protective atmosphere. The production of finished pipes by using a heat treatment furnace without protective atmosphere has the following problems: 1. the burning loss of the pipe is serious, so that the yield of the pipe is reduced; 2. the surface oxidation is serious, so that the background of the pipe needing flaw detection is not good, and the probability of false alarm and missed detection is increased; 3. the surface oxidation of the boiler and other pipes is serious, which can affect the subsequent spraying and quality inspection processes and increase the quality risk.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a steel pipe anti-oxidation treatment method which can improve the oxidation degree of the surface of a pipe under the non-protective atmosphere, reduce the flaw detection omission ratio and the false alarm ratio, avoid the burning loss of the pipe and be beneficial to improving the yield.
In order to solve the technical problems, the invention adopts the following technical scheme:
an anti-oxidation treatment method of a steel pipe under a non-protective atmosphere comprises the following steps:
s1, determining an air-fuel ratio: determining a theoretical mixing ratio of air and fuel for complete combustion according to the fuel of the non-protective atmosphere furnace, and taking 70-80% of the theoretical mixing ratio as an air-fuel ratio for heat treatment;
s2, determining a heat treatment temperature range: determining the national standard range of the heat treatment temperature of the steel pipe according to the type of the steel pipe to be treated, and taking the interval of 0-30% in the national standard range as the heat treatment temperature range of the steel pipe;
and S3, during heat treatment, determining the air-fuel ratio in the furnace according to the air-fuel ratio in the step S1, and controlling the temperature in the furnace according to the heat treatment temperature range in the step S2.
By adopting the process, the oxygen residue in the furnace can be further reduced by reducing the air-fuel ratio, and the formation of an oxidation environment is avoided, so that the oxidation degree of the steel surface is improved, the pipe background of flaw detection is improved, the false alarm and missed detection probability is reduced, and the quality of the detected product is ensured. In addition, by adopting the interval of 0-30% of the national standard temperature range as the heat treatment temperature, the heat treatment of the pipe can be ensured to meet the national standard requirement, the burning loss of the pipe can be avoided, and the oxidation of the pipe is reduced. After the surface oxidation of the pipe is improved, the subsequent spraying and quality inspection processes are facilitated, and the quality risk is reduced. Therefore, the method can improve the yield of the pipe and ensure the quality of the inspected product of the pipe.
Further, the micro positive pressure in the furnace is maintained during the heat treatment.
Therefore, no external air can enter the furnace through the observation temperature measuring holes and the inlet and outlet furnace doors to provide oxygen, so that the oxidation degree of the surface of the pipe is reduced.
Further, the pressure in the furnace is 15Pa to 25Pa.
Further, after the heat treatment, the surface of the pipe is firstly pickled and then straightened.
Therefore, the iron oxide on the surface of the pipe can be removed before straightening, harder iron oxide is prevented from being pressed into a base body on the outer surface of the pipe in the straightening process, and subsequent spraying operation is facilitated.
In summary, the invention has the following advantages:
1. the burning loss on the surface of the pipe is greatly reduced, and the yield is improved.
2. Due to the adjustment of the air-fuel ratio and the lower limit of the heat treatment temperature, the energy consumption is reduced to a certain degree.
3. The surface quality of the pipe is improved to a great extent, the flaw detection background is good, the false alarm phenomenon is eliminated, and the flaw detection efficiency and the quality of the pipe are improved.
4. The requirements of users such as boilers, automobiles, friction matching and the like on the spraying operation of the pipes are met.
Drawings
FIG. 1 is a schematic view of the process flow for the treatment of pipes according to the present invention.
FIG. 2 is a schematic view of a surface after being treated and polished by a conventional heat treatment process.
FIG. 3 is a schematic representation of the surface after heat treatment and polishing using the process of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1, the conventional steel pipe manufacturing process includes: the hot-rolled hollow billet is circulated from acid cleaning, lubrication, cold drawing (rolling) and semi-finished product heat treatment to cold drawing (or cold rolling) to the specification of a finished product, and then is subjected to finished product heat treatment, straightening, pipe cutting and qualified inspection, and then is stored in a warehouse.
The heat treatment process of the traditional pipe finished product generally relates to 3 main parameters of heat treatment temperature, time and a cooling mode, the pipe after heat treatment needs to meet the requirements of the corresponding national standard on mechanical property, process property, microstructure, surface quality and the like and specific use requirements, wherein the description of the national standard on the surface quality refers to that the defects of no cracks, folding, scabbing, rolling fracture, delamination and the like exist on the inner surface and the outer surface of the steel pipe, and surface oxidation defects are not mentioned. In the practical production process, the applicant finds that the steel pipe produced by the traditional heat treatment process has larger false flaw detection and false inspection missing probability, and the quality of the detected pipe is influenced. Moreover, the pipe adopting the traditional heat treatment process has great influence on the subsequent spraying operation and low spraying qualification rate. Even if the surface of the pipe is polished and then sprayed, the requirement of the spraying operation is difficult to achieve. In particular, the pipe after heat treatment in a non-protective atmosphere is more serious.
For this purpose, as shown in fig. 1, the following process is used to heat-treat the pipe in this embodiment:
1. the air-fuel ratio of the heat treatment furnace is adjusted to be small, namely, the hearth is ensured to be in a reducing atmosphere, namely, the air participating in the combustion reaction is ensured not to have redundant oxygen to participate in the oxidation reaction of the pipe. For pipes with different surface quality grades, the air-fuel ratio in the heat treatment furnace is determined in the following way:
firstly, according to an energy medium (fuel) of a heat treatment furnace, determining a theoretical mixing ratio (complete combustion air-fuel ratio) of air and the energy medium (fuel) for complete combustion;
in the heat treatment furnace, the pipes are subjected to heat treatment in batches, and under the condition of ensuring that other heat treatment conditions are consistent, the air-fuel ratio of each batch is gradually reduced from a theoretical mixing ratio (complete combustion air-fuel ratio) according to an arithmetic progression (which is equivalent to increasing the amount of an energy medium under the condition of keeping the air introduction unchanged or reducing the air introduction amount under the condition of keeping the energy medium unchanged);
and detecting the surface quality of each batch of pipes, selecting the pipes meeting the surface quality grade requirement and the corresponding air-fuel ratio, and taking the air-fuel ratio as the air-fuel ratio for processing the surface quality grade pipes.
If the surface quality of a plurality of batches of pipes meets the surface quality grade requirement, the range between the maximum air-fuel ratio and the minimum air-fuel ratio is used as the air-fuel ratio range for processing the pipes with the surface quality grade.
Such as: a top-spraying (6 flat flame burners of 50 types) type roller-bottom continuous heat treatment furnace with the length of about 30 meters adopts natural gas as an energy medium, the theoretical mixing ratio of air and natural gas for complete combustion is 10, the ratio is determined by a method for balancing the consumption of the natural gas and the surface quality of a pipe after heat treatment after the air-fuel ratio is reduced, namely the increased consumption of the natural gas is matched with the surface quality grade of the pipe. Through tests, the air-fuel ratio of the heat treatment furnace can meet the surface quality requirement when being about 7.5.
2. Maintaining the micro positive pressure in the heat treatment furnace: in the heat treatment process, the draft of the chimney in the hearth is controlled by adjusting the lifting height of the flue gate plate, so that the micro-positive pressure of the hearth atmosphere is realized, and no external air enters the furnace through the observation temperature measuring holes and the feeding and discharging furnace doors to provide oxygen so as to increase the surface oxidation of the pipe. There are two main ways of implementing the microsormal control,
the heat treatment furnace with the computer temperature control interface can be automatically controlled by displaying the pressure of the hearth to be 15-25 Pa.
For a heat treatment furnace without a computer temperature control interface, dust or light materials can be scattered from the upper part of a small furnace door at the position in the furnace, and the dust or light materials are judged to be achieved by slight outward inclination without being sucked into the furnace.
3. Carrying out heat treatment by adopting the temperature meeting the lower limit of the temperature deviation range: and (3) inquiring the temperature range of heat treatment of the steel finished product of the grade according to related standards (such as national standards) aiming at the pipes of different grades, and selecting the lower limit in the temperature range as the heat treatment temperature. For example, the heat treatment temperature requirement of a 20G high-pressure pipe finished product is 880-940 ℃ (see GB/T5310-2017), if the finished product is a small-specification-size pipe, the heating speed is high, the uniformity is relatively good, the temperature can be compressed to 880-900 ℃ by detecting indexes such as mechanical properties, process properties, microstructures and the like required by relevant national standards at different heat treatment temperatures, and the various relevant requirements of the national standards are met, but the oxidation degree of the pipe is greatly reduced.
The oxidation problem of the surface of the pipe can be greatly reduced after the three treatments, the flaw detection background can be greatly improved, but for the boiler pipe, the automobile pipe and the friction pipe which need subsequent spraying operation, the oxidation problem of the surface of the pipe which is not serious can bring great influence, even the spraying operation can not be carried out, and even the surface polishing of the pipe can not meet the requirement of the spraying operation. Tests prove that the spraying operation is influenced by the surface oxidation phenomenon of the heat-treated pipe because the oxidized iron on the surface layer of the pipe is hard and can be pressed into a base body on the outer surface of the pipe by a straightening roller in the straightening process of subsequent pipe production, so that the defect has a certain depth and the subsequent polishing operation cannot be repaired. After the test, an acid washing procedure can be added after the heat treatment of the finished product and before the straightening, so that the ferric oxide on the surface of the pipe is removed, the influence of surface oxidation cannot be aggravated by the straightening, and the produced pipe can also meet the spraying requirement of a subsequent user.
According to the embodiment, the lower limit of the heat treatment temperature is executed, the air-fuel ratio (belonging to non-main process parameters of heat treatment) is reduced, other parameters such as heat treatment time, a cooling mode and the like are unchanged, and an acid pickling process is added after the heat treatment and before the straightening of the finished product, so that the treated pipe still meets the indexes such as mechanical property, process property, microstructure, surface quality and the like required by corresponding national standards, wherein the surface oxidation defect is obviously improved except that the defects such as cracks, folding, scabbing, rolling and breaking and the like do not exist in the surface quality index, and the spraying operation requirement of a special user can be met. Fig. 2 and 3 show the surface of the pipe processed and polished by the conventional heat treatment and the surface of the pipe processed and polished by the present method, respectively.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. An anti-oxidation treatment method of a steel pipe under a non-protective atmosphere is characterized by comprising the following steps:
s1, determining an air-fuel ratio: determining a theoretical mixing ratio of air and fuel for complete combustion according to the fuel of the non-protective atmosphere furnace, and taking 70-80% of the theoretical mixing ratio as an air-fuel ratio for heat treatment;
s2, determining a heat treatment temperature range: determining the national standard range of the heat treatment temperature of the steel pipe according to the type of the steel pipe to be treated, and taking the interval of 0-30% in the national standard range as the heat treatment temperature range of the steel pipe;
and S3, during heat treatment, determining the air-fuel ratio in the furnace according to the air-fuel ratio in the step S1, and controlling the temperature in the furnace according to the heat treatment temperature range in the step S2.
2. A method of oxidation-preventing treatment of a steel pipe in a non-protective atmosphere according to claim 1, wherein a slight positive pressure in the furnace is maintained during the heat treatment.
3. The method of oxidation-preventing a steel pipe in a non-protective atmosphere according to claim 2, wherein the pressure in the furnace is 15Pa to 25Pa.
4. A method of oxidation-preventing treatment of a steel pipe in a non-protective atmosphere as claimed in claim 1, wherein after the heat treatment, the surface of the steel pipe is first pickled and then straightened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165037.0A CN115338276A (en) | 2022-09-23 | 2022-09-23 | Anti-oxidation treatment method for steel pipe under non-protective atmosphere |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165037.0A CN115338276A (en) | 2022-09-23 | 2022-09-23 | Anti-oxidation treatment method for steel pipe under non-protective atmosphere |
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| CN115338276A true CN115338276A (en) | 2022-11-15 |
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| CN202211165037.0A Pending CN115338276A (en) | 2022-09-23 | 2022-09-23 | Anti-oxidation treatment method for steel pipe under non-protective atmosphere |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS629752A (en) * | 1985-07-05 | 1987-01-17 | Mitsubishi Heavy Ind Ltd | Temperature control device for preventing oxidation in continuous casting of thin sheet |
| JPS629753A (en) * | 1985-07-05 | 1987-01-17 | Mitsubishi Heavy Ind Ltd | Device for controlling temperature and preventing oxidation in continuous casting of thin sheet |
| JPH01212722A (en) * | 1988-02-19 | 1989-08-25 | Kobe Steel Ltd | Method for continuously heating steel strip |
| JP2004057999A (en) * | 2002-07-31 | 2004-02-26 | Toyota Central Res & Dev Lab Inc | Exhaust gas cleaning promoter |
| JP2005133180A (en) * | 2003-10-31 | 2005-05-26 | Sumitomo Metal Ind Ltd | Steel sheet for heat treatment, and its production method |
| KR20120070171A (en) * | 2010-12-21 | 2012-06-29 | 주식회사 포스코 | Heating method for steel material of producing wire for reducing high temperature scale |
| CN104017981A (en) * | 2014-06-05 | 2014-09-03 | 河北钢铁股份有限公司唐山分公司 | Process for heating continuous casting slabs by regenerative roller-hearth type heating furnace |
| CN104152668A (en) * | 2014-07-28 | 2014-11-19 | 首钢总公司 | Device and method for reducing steel billet oxidation burning loss of steel rolling heating furnace |
| CN108393360A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of improving cut deal surface quality |
| CN112815702A (en) * | 2020-12-12 | 2021-05-18 | 舞阳钢铁有限责任公司 | Production method for reducing burning loss of Cr-Mo steel blank in continuous furnace |
-
2022
- 2022-09-23 CN CN202211165037.0A patent/CN115338276A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS629752A (en) * | 1985-07-05 | 1987-01-17 | Mitsubishi Heavy Ind Ltd | Temperature control device for preventing oxidation in continuous casting of thin sheet |
| JPS629753A (en) * | 1985-07-05 | 1987-01-17 | Mitsubishi Heavy Ind Ltd | Device for controlling temperature and preventing oxidation in continuous casting of thin sheet |
| JPH01212722A (en) * | 1988-02-19 | 1989-08-25 | Kobe Steel Ltd | Method for continuously heating steel strip |
| JP2004057999A (en) * | 2002-07-31 | 2004-02-26 | Toyota Central Res & Dev Lab Inc | Exhaust gas cleaning promoter |
| JP2005133180A (en) * | 2003-10-31 | 2005-05-26 | Sumitomo Metal Ind Ltd | Steel sheet for heat treatment, and its production method |
| KR20120070171A (en) * | 2010-12-21 | 2012-06-29 | 주식회사 포스코 | Heating method for steel material of producing wire for reducing high temperature scale |
| CN104017981A (en) * | 2014-06-05 | 2014-09-03 | 河北钢铁股份有限公司唐山分公司 | Process for heating continuous casting slabs by regenerative roller-hearth type heating furnace |
| CN104152668A (en) * | 2014-07-28 | 2014-11-19 | 首钢总公司 | Device and method for reducing steel billet oxidation burning loss of steel rolling heating furnace |
| CN108393360A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of improving cut deal surface quality |
| CN112815702A (en) * | 2020-12-12 | 2021-05-18 | 舞阳钢铁有限责任公司 | Production method for reducing burning loss of Cr-Mo steel blank in continuous furnace |
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| Title |
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