CN118253939A - Quenching and tempering micro-drawing process for high-strength steel pipe - Google Patents
Quenching and tempering micro-drawing process for high-strength steel pipe Download PDFInfo
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- CN118253939A CN118253939A CN202410371780.4A CN202410371780A CN118253939A CN 118253939 A CN118253939 A CN 118253939A CN 202410371780 A CN202410371780 A CN 202410371780A CN 118253939 A CN118253939 A CN 118253939A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 title claims abstract description 44
- 238000005496 tempering Methods 0.000 title claims abstract description 35
- 238000010791 quenching Methods 0.000 title claims abstract description 29
- 230000000171 quenching effect Effects 0.000 title claims abstract description 29
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000005461 lubrication Methods 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 8
- 238000010622 cold drawing Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000011221 initial treatment Methods 0.000 claims abstract description 5
- 238000011282 treatment Methods 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 21
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of steel tube processing, and provides a high-strength steel tube tempering micro-drawing process, which comprises the following steps of: step (1): selecting a hot rolled blank for initial treatment, and performing cold drawing after pickling and lubrication; step (2): stress relief annealing is carried out to reduce internal stress and improve the stability of the steel pipe; step (3): straightening, sawing, quenching and tempering, and detecting mechanical properties; step (4): carrying out acid washing lubrication, then carrying out micro-pulling, and carrying out stress relief annealing, straightening, sawing, flaw detection and full picking performance and size again; step (5): carrying out acid washing neutralization oiling rust prevention treatment; step (6): finally, checking and packaging are carried out to ensure that the quality of the product meets the standard requirements. According to the quenching and tempering micro-drawing process for the high-strength steel pipe, the dimensional deviation of the steel pipe can be controlled more accurately through the micro-drawing process, and the quality stability of a product is improved; the occurrence of cracks is reduced; the yield of the steel pipe is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of steel tube machining, in particular to a quenching and tempering micro-drawing process for a high-strength steel tube.
Background
The manufacture of petroleum drilling pipes is an important component in the field of petroleum engineering, and these pipes are required to have high strength, high wear resistance, high corrosion resistance, etc. in order to cope with extreme working environments. Currently, common materials of manufacture include high strength alloy steels such as 42 CrMoA. The traditional production process mainly adopts hot rolled blanks to carry out mechanical processing after quenching and tempering treatment so as to meet the requirements of mechanical properties and dimensional accuracy of the steel pipes.
However, the conventional process has a series of problems:
1. The dimensional deviation is large: the dimensional deviation of the hot rolled blank is large, so that the dimensional accuracy of the steel pipe subjected to cold drawing tempering is difficult to meet the requirements of customers, and complicated machining is needed to correct the size.
2. Crack problem: the quenched and tempered steel pipe is easy to generate defects such as cracks, so that the service life and the safety of the steel pipe are affected, and the yield of materials is reduced.
3. Waste problem: to avoid quality problems such as cracks, it is often necessary to reserve a cutting margin at the crack during production, which results in waste of material and increased cost.
In view of the above, the conventional production process has many disadvantages in meeting the manufacturing requirements of high-strength alloy steel pipes, so a new process is needed to solve these problems and to improve the production efficiency and quality level of the steel pipes.
Disclosure of Invention
The invention provides a quenching and tempering micro-drawing process for a high-strength steel pipe, which solves the defects of the traditional production process in meeting the manufacturing requirements of the high-strength alloy steel pipe.
The technical scheme of the invention is as follows: the method comprises the following steps:
Step (1): selecting a hot rolled blank for initial treatment, and performing cold drawing after pickling and lubrication;
step (2): stress relief annealing is carried out to reduce internal stress and improve the stability of the steel pipe, and the annealing temperature is controlled at 500 ℃ for 2 hours;
step (3): straightening, sawing, quenching and tempering, and detecting mechanical properties;
Step (4): carrying out pickling lubrication, then carrying out micro-pulling, and carrying out stress relief annealing, straightening, sawing, flaw detection and full picking performance and size again;
Step (5): carrying out acid washing neutralization oiling antirust treatment to ensure the surface of the steel pipe to be clean and provide good antirust effect;
step (6): finally, checking and packaging are carried out to ensure that the quality of the product meets the standard requirements.
As a preferable technical scheme of the invention, the initial treatment mode in the step (1) is softening annealing at 750 ℃ of the blank so that the hardness is less than or equal to 180HB.
As a preferable technical scheme of the invention, in the cold drawing process in the step (1), wall reduction of 0.5-1.0mm is reserved for micro drawing adjustment precision after modulation.
As a preferable technical scheme of the invention, the intermediate frequency 900-1000 ℃ quenching and the 600-700 ℃ tempering are adopted in the tempering process of the step (3).
As a preferable technical scheme of the invention, the port is cut flat before tempering in the step (3), and plugs are required to be used for plugging the two ends of the steel pipe during quenching, so that the explosion of the micro-pulling process head after tempering is reduced.
As a preferable technical scheme of the invention, the performance of the quenched and tempered steel pipe is as follows: the yield strength is 920MPa, the tensile strength is 1050MPa, the surface hardness can reach 310HB, and the impact energy V-shaped room temperature is 74/72/76J.
As a preferable technical scheme of the invention, the inner and outer dimension deviation of the quenched and tempered steel pipe is controlled to be (0, +0.50)/(0, +0.10), the wall thickness deviation is +/-7.5S, and the total length is less than or equal to 0.055 percent L (mm).
As a preferable technical scheme of the invention, the straightness after straightening in the step (4) can reach less than or equal to 1.0mm/m.
The working principle and the beneficial effects of the invention are as follows:
1. And the dimensional accuracy is improved: through the micro-drawing process, the size of the steel pipe can be effectively adjusted, and the steel pipe can meet the precision requirement of products. Compared with the traditional process, the process can more accurately control the dimensional deviation of the steel pipe, and improves the quality stability of the product.
2. Reduction of crack defects: the process adopts a quenching and tempering micro-drawing process, and can effectively reduce the risks of defects such as cracks and the like of the quenched and tempered steel pipe. The micro-drawing process enables the tissue structure of the steel pipe to be more uniform, internal stress is released, and therefore occurrence of cracks is reduced.
3. The yield is improved: by reducing the crack defect of the quenched and tempered steel pipe, the process obviously reduces the waste rate of the material. Compared with the traditional process, the process can improve the yield of the steel pipe, reduce the production cost and improve the economic benefit.
4. And the production efficiency is enhanced: the process adopts a micro-drawing process to adjust the size, and has higher production efficiency compared with the traditional machining mode. The micro-drawing process is simple and feasible, the size of the steel pipe can be quickly adjusted, the production efficiency is improved, and the production period is reduced.
5. Optimizing the product performance: the process can effectively improve the mechanical property and the surface quality of the steel pipe, so that the steel pipe has better performances such as wear resistance, corrosion resistance, tensile strength and the like. The optimized product performance can meet the higher requirements of customers, and the competitiveness of the product is improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Selecting a steel pipe blank: a billet of material 42CrMoA, tube gauge 140×11.5×800 mm (outer diameter×wall thickness×length), and wall thickness 11.5mm was used as a raw material.
Putting the hot rolled blank into an annealing furnace, and keeping the hot rolled blank for a certain time, usually 2 hours, when the temperature reaches 750 ℃ so as to completely soften the steel and reach the hardness of less than or equal to 180HB; after pickling and lubrication, performing primary cold drawing, wherein the specification of the tube is 135 x 116 x 9500mm (the length of the outer diameter is the inner diameter), the wall thickness allowance is reserved for 0.5mm allowance of the finished product, and the fine drawing adjustment precision is performed after tempering;
step (2): stress relief annealing is carried out, the annealing temperature is controlled at 500 ℃ and the time is 2 hours, so that the internal stress is reduced, and the stability of the steel pipe is improved;
Step (3): straightening, quenching and tempering after sawing, detecting mechanical properties, cutting the port flat before quenching and tempering, reducing tail cracking phenomenon, quenching at the medium frequency of 900 ℃ in the quenching and tempering process, wherein a quenching medium is gas, water or oil cooling, plugs are used for plugging the two ends of a steel pipe during quenching, the quenching time is controlled within 2 minutes, so that the steel reaches a certain hardness, tempering treatment is carried out at 640 ℃ for 4 hours, the structure of the steel is adjusted, the strength and toughness of the steel are improved, the cracking of a micro-pulling process head after quenching and tempering can be effectively reduced, pickling and lubrication are carried out, the oxidized iron sheet is removed from the pickling surface of hydrochloric acid, the steel pipe enters a neutralizing tank immediately after flushing, and rust-preventive oil is sprayed on the surface after soaking, so that the surface of the steel pipe is clean, and a good rust-preventive effect is provided.
The performance of the quenched and tempered steel pipe is as follows: the yield strength is 920MPa, the tensile strength is 1050MPa, the surface hardness can reach 310HB, the impact energy V-shaped room temperature is 74/72/76J, the internal and external size deviation of the quenched and tempered steel pipe is controlled to be (0, +0.50)/(0, +0.10), the wall thickness deviation is +/-7.5S, and the total length is less than or equal to 0.055 percent L (mm).
And (3) performing micro-drawing, namely adjusting the size of the steel pipe through micro deformation, setting micro-drawing parameters, such as the deformation amount is 0.1mm, the drawing speed is 10mm/s, ensuring that the dimensional accuracy meets the requirement, ensuring that the steel specification after micro-drawing is 133 x 115 x 10000mm (the length of the outer diameter is the inner diameter), performing stress relief annealing again in the step (2), calculating according to the rebound amount of the die, ensuring that the dimensional accuracy of a finished product meets the requirement, and finally performing inspection and packaging after the straightness after straightening is less than or equal to 1.0mm/m, sawing, flaw detection and rust prevention, so as to ensure that the product quality meets the standard requirement.
Ultrasonic flaw detection is adopted for flaw detection, and longitudinal and transverse flaw detection is carried out according to GB/T5777-2019U 2.
Through the embodiment, the quenching and tempering micro-drawing process of the high-strength steel pipe can be effectively realized, the production efficiency and the product quality of the steel pipe are improved, and the production requirement is met.
In conclusion, the high-strength steel pipe tempering micro-drawing process can effectively adjust the size of the steel pipe through the micro-drawing process, ensure that the steel pipe meets the precision requirement of a customer, can more accurately control the size deviation of the steel pipe, and improves the quality stability of products; the risk of defects such as cracks and the like of the quenched and tempered steel pipe can be effectively reduced, the microstructure of the steel pipe is more uniform through a micro-drawing process, and the internal stress is released, so that the occurrence of the cracks is reduced; by reducing the crack defect of the quenched and tempered steel pipe, the process obviously reduces the waste rate of materials, can improve the yield of the steel pipe, reduces the production cost and improves the economic benefit; the production efficiency is higher, the micro-drawing process is simple and easy to implement, the size of the steel pipe can be quickly adjusted, the production efficiency is improved, and the production period is reduced; the mechanical property and the surface quality of the steel pipe can be effectively improved, so that the steel pipe has better performances such as wear resistance, corrosion resistance, tensile strength and the like. The optimized product performance can meet the higher requirements of customers, and the competitiveness of the product is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. A high-strength steel tube tempering micro-drawing process is characterized in that: the method comprises the following steps:
Step (1): selecting a hot rolled blank for initial treatment, and performing cold drawing after pickling and lubrication;
step (2): stress relief annealing is carried out to reduce internal stress and improve the stability of the steel pipe, and the annealing temperature is controlled at 500 ℃ for 2 hours;
step (3): straightening, sawing, quenching and tempering, and detecting mechanical properties;
Step (4): carrying out pickling lubrication, then carrying out micro-pulling, and carrying out stress relief annealing, straightening, sawing, flaw detection and full picking performance and size again;
Step (5): carrying out acid washing neutralization oiling antirust treatment to ensure the surface of the steel pipe to be clean and provide good antirust effect;
step (6): finally, checking and packaging are carried out to ensure that the quality of the product meets the standard requirements.
2. The process for quenching and tempering and micro-pulling a high-strength steel pipe according to claim 1, wherein the initial treatment mode in the step (1) is softening annealing at 750 ℃ of a blank so that the hardness is less than or equal to 180HB.
3. The process for quenching and tempering and micro-drawing the high-strength steel pipe according to claim 2, wherein wall reduction of 0.5-1.0mm is reserved in the cold drawing process in the step (1) for micro-drawing adjustment precision after modulation.
4. A high strength steel pipe tempering micro-drawing process according to claim 3, wherein the tempering process of step (3) adopts intermediate frequency 900-1000 ℃ quenching and 600-700 ℃ tempering.
5. The process for quenching and tempering a high-strength steel pipe according to claim 4, wherein the port is cut flat before quenching and tempering in the step (3), and plugs are required to be used for plugging the two ends of the steel pipe during quenching, so that the explosion of the micro-pulling process head after quenching and tempering is reduced.
6. The process for tempering and micro-pulling a high-strength steel pipe according to claim 5, wherein the tempered steel pipe has the following properties: the yield strength is 920MPa, the tensile strength is 1050MPa, the surface hardness can reach 310HB, and the impact energy V-shaped room temperature is 74/72/76J.
7. The process for micro-drawing quenched and tempered steel pipe according to claim 6, wherein the deviation of the internal and external dimensions of the quenched and tempered steel pipe is controlled to be (0, +0.50)/(0, +0.10), the deviation of the wall thickness is + -7.5S%, and the total length is less than or equal to 0.055% L (mm).
8. The process for quenching and tempering and micro-pulling a high-strength steel pipe according to claim 1, wherein the straightness after straightening in the step (4) is less than or equal to 1.0mm/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410371780.4A CN118253939A (en) | 2024-03-29 | 2024-03-29 | Quenching and tempering micro-drawing process for high-strength steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410371780.4A CN118253939A (en) | 2024-03-29 | 2024-03-29 | Quenching and tempering micro-drawing process for high-strength steel pipe |
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| CN118253939A true CN118253939A (en) | 2024-06-28 |
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| CN202410371780.4A Pending CN118253939A (en) | 2024-03-29 | 2024-03-29 | Quenching and tempering micro-drawing process for high-strength steel pipe |
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| CN (1) | CN118253939A (en) |
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- 2024-03-29 CN CN202410371780.4A patent/CN118253939A/en active Pending
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