CN116460143A - Production process of large-caliber seamless steel pipe with diameter larger than phi 457mm - Google Patents
Production process of large-caliber seamless steel pipe with diameter larger than phi 457mm Download PDFInfo
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- CN116460143A CN116460143A CN202310273044.0A CN202310273044A CN116460143A CN 116460143 A CN116460143 A CN 116460143A CN 202310273044 A CN202310273044 A CN 202310273044A CN 116460143 A CN116460143 A CN 116460143A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000004513 sizing Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 230000004907 flux Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000001580 bacterial effect Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a production process of a large-caliber seamless steel pipe with the diameter larger than phi 457mm, which is characterized by comprising the steps of pipe blank preparation, heating, perforation, continuous rolling and pipe removal, sizing, cooling, sectioning, sawing head and tail, heat treatment, straightening, flaw detection and finishing; the invention can realize that the steel pipe with the diameter of more than 457mm is produced by adopting the pipe blank with the diameter of more than 457mm on the phi 460 machine set, the investment is relatively small, the product quality and the production efficiency are relatively high, and the production cost is lower.
Description
Technical Field
The invention relates to the technical field of seamless steel pipe production, in particular to a large-caliber seamless steel pipe production process with the diameter larger than phi 457mm, namely a large-caliber seamless steel pipe production process with the diameter larger than phi 457mm on a phi 460PQF unit.
Background
The large-caliber seamless steel pipe with the diameter larger than phi 457mm is generally made of carbon steel and alloy steel, and can be widely applied to the fields of petrochemical industry, large boilers, high-pressure containers, mechanical structures and the like. The main production method comprises a spin-expansion method, a push-expansion method, a PQF unit continuous rolling method and the like, wherein the spin-expansion method is to roll a large-caliber steel pipe on a two-roller rotary pipe expander after reheating by utilizing a small-specification parent pipe, and the method has high energy consumption and internal thread defects on the inner surface of the steel pipe; the pushing and expanding method is to push and expand the large-caliber steel pipe on the pipe expander after re-induction heating by utilizing the small-specification main pipe, and has high energy consumption and lower production efficiency; the continuous rolling method of the PQF unit is a new method for producing large-caliber steel pipes, which has high production efficiency, low cost and good quality compared with other methods.
At present, the upper limit specification of the Phi 460PQF unit in the industry is Phi 457mm, and steel pipes with the specification more than Phi 457mm cannot be produced, such as steel pipes with the specifications of Phi 470mm, phi 508mm and the like. The main reasons are that the equipment capacity is insufficient, such as the sawing capacity of a tube blank saw is insufficient; the furnace bottom strength of the annular furnace is insufficient; the opening degree of the mechanical arm for charging and discharging the annular furnace is insufficient; the power of the motor of the perforating machine is insufficient; the equipment strength of the mandrel circulating device of the PQF continuous rolling mill is insufficient, so that steel pipes with the specification of more than phi 457mm can only be produced on a phi 508PQF unit. For example, chinese patent CN106180195a discloses in 2016 a "508 mm large-caliber seamless steel pipe hot continuous rolling production method"; in the patent, a phi 508PQF unit is adopted, a pipe blank with the diameter of phi 500mm is adopted, and the working procedures of pipe blank preparation, pipe blank heating, pipe blank perforation, pipe blank continuous rolling, pipe stripping, sizing and the like are carried out to produce a phi 508mm large-caliber seamless steel pipe; the heating time for producing the large-caliber seamless steel tube by the method is longer, the productivity is lower, and the production cost is higher; if the phi 460PQF unit is completely modified according to the equipment configuration of the phi 508mmPQF unit, the investment is very huge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a production process of a large-caliber seamless steel pipe with the diameter larger than phi 457 mm; the method can break through the specification range of the prior product on the phi 460 machine set and produce the seamless steel pipe with the diameter larger than phi 457 mm.
The technical scheme provided by the invention is as follows: the production process of the large-caliber seamless steel pipe with the diameter larger than phi 457mm is characterized by comprising the following steps:
step one: preparing a tube blank, inspecting and analyzing the tube blank by using the tube blank with the specification phi 450mm, removing the unqualified tube blank, and sawing the tube blank by using a tube blank saw to segment the tube blank;
step two: heating, namely heating the tube blank, wherein the heating temperature of the tube blank is 1150-1280 ℃, and the heating time is 300-360 minutes;
step three: perforating by adopting a two-roller bacterial type perforating machine, wherein the diameter of a perforated nominal capillary tube is phi 580-588 mm, and the perforation expanding rate is 28-30%; the roll gap of the perforating machine is 390-405 mm; the diameter of the top head is phi 450-490 mm; the length of the plug is 800-860 mm, and the forward extension of the plug is 110-230 mm; the distance between the guide plates is 440-460 mm; the wall thickness of the capillary tube is 23-52 mm;
step four: continuous rolling and pipe removal, wherein a three-roller five-frame PQF continuous rolling mill is adopted to carry out wall reduction extension on the steel pipe, and the steel pipe is separated from the core rod through pipe removal machines of three frames; the nominal hole pattern of the mandrel mill is phi 538mm, and the wall reduction is 10-16 mm; the diameter of the core rod is phi 460-520mm; the diameter of the steel pipe which is separated from the pipe separating machine is phi 523mm, and the wall thickness of the steel pipe is 9.5-40 mm;
step five: sizing, namely rounding and sizing the steel pipe by adopting a three-roller sizing mill, wherein when phi 508mm is produced, the sizing mill reduces the diameter of a rough pipe with the diameter of phi 523mm to phi 513-515 mm, the diameter of the cooled rough pipe is phi 508mm, and the wall thickness of the steel pipe is 9.5-40 mm; when the phi 470mm is produced, reducing the diameter of the pierced billet with the phi of 523mm to be phi 475-476 mm by a sizing mill, wherein the diameter of the pierced billet after cooling is phi 470mm, and the wall thickness of the steel pipe is 9.5-40 mm;
step six: cooling, wherein the cooling temperature of the steel pipe is less than or equal to 80 ℃;
step seven: sectioning and sawing heads and tails;
step eight: heat treatment, normalizing and tempering or quenching and tempering heat treatment is carried out by adopting a heat treatment furnace;
step nine: straightening, namely cold straightening or warm straightening is adopted;
step ten: flaw detection, adopting a magnetic flux leakage flaw detection, ultrasonic flaw detection, a water pressure test mode or a combination mode of a plurality of the magnetic flux leakage flaw detection, the ultrasonic flaw detection and the water pressure test modes;
step eleven: finishing, including oiling, measuring, final inspection and packaging.
Further, the outlet cone angle of the perforating roller of the two-roller bacterial type perforating machine in the third step is 6 degrees, and the shape of the plug is three-section.
Further, the three-roller five-frame PQF mandrel mill in the step four is in a phi 538mm hole type, the width of a roller is increased by 50mm, and a hollow mandrel is adopted.
Further, the nominal diameter of the roller of the three-roller sizing mill in the step five is unchanged, and the width of the roller is increased by 50-60mm.
Further, the heat treatment furnace in the step eight is a pulse combustion step heat treatment furnace; the quenching mode is steel pipe rotary internal spraying and external spraying or internal spraying and external spraying and semi-immersion water quenching.
Further, the magnetic flux leakage flaw detection mode in the step ten adopts a mode that a probe is not moved and a steel pipe advances while rotating; ultrasonic flaw detection is a mode of probe movement and steel pipe rotation.
The invention has the beneficial effects that:
1. adopting a tube blank with the existing specification of phi 450mm, and producing a seamless steel tube with the diameter larger than phi 457mm on a phi 460 unit through the steps of tube blank preparation, tube blank heating, tube blank perforation, tube blank continuous rolling, tube stripping and the like;
2. the critical equipment such as a tube blank saw, an annular furnace, a perforating machine and the like does not need to carry out capacity reinforcing transformation by adopting the tube blank with the existing specification of phi 450 mm; because the hollow core rod is adopted, the weight of the core rod is not increased, and the PQF continuous rolling mill core rod circulating device is not required to be modified, so that the investment of equipment modification is reduced;
3. as the tube blank with the specification of phi 450mm is adopted, the diameter of the tube blank is smaller than that of the tube blank with the specification of phi 500mm, the heating time is shorter, the production efficiency is higher, and the production cost is lower;
4. the production of the steel pipe with larger caliber above phi 457mm is realized on the phi 460mm machine set, the product specification range of the existing machine set is enlarged, and the market demand is better met.
Drawings
FIG. 1 is a flow chart of the present invention.
Description of the embodiments
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
As shown in FIG. 1, the production process of the large-caliber seamless steel pipe with the diameter larger than phi 457mm comprises the following steps:
step one: preparing a tube blank, namely performing size inspection, flaw detection, chemical analysis and metallographic microscopic analysis on the tube blank by adopting the tube blank with the specification phi 450mm, and removing unqualified tube blanks; sawing and cutting the tube blank into sections; peeling the outer surface of the high alloy tube blank;
step two: heating a pipe blank by adopting an annular heating furnace, wherein the heating temperature of the pipe blank is 1150-1280 ℃, the heating time is about 300-360 minutes, and the alloy steel is heated at a low temperature and a low speed according to the material and specification of the pipe blank;
step three: perforating by adopting a two-roller bacterial type perforating machine, wherein the diameter of a perforated nominal capillary tube is phi 580-588 mm, and the perforation expanding rate is 28-30%; the roll gap of the perforating machine is 390-405 mm; the diameter of the top head is phi 450-490 mm; the length of the plug is 800-860 mm, and the forward extension of the plug is 110-230 mm; the distance between the guide plates is 440-460 mm; the wall thickness of the capillary tube is 23-52 mm; in order to achieve the aim that the perforation expansion rate reaches about 30 percent, the cone angle of the outlet of a perforation roller of the two-roller bacterial type perforation machine is designed to be 6 degrees, and the shape of a plug is three-section;
step four: continuous rolling and pipe removal, wherein a three-roller five-frame PQF continuous rolling mill is adopted to carry out wall reduction extension on the steel pipe, and the steel pipe is separated from the core rod through pipe removal machines of three frames; the nominal hole pattern of the mandrel mill is phi 538mm, and the wall reduction is 10-16 mm; the diameter of the core rod is phi 460-520mm; the diameter of the steel pipe which is separated from the pipe separating machine is phi 523mm, and the wall thickness of the steel pipe is 9.5-40 mm; the three-roller five-frame PQF continuous pipe mill is in a phi 538mm hole type, and in order to meet the processing of the phi 538mm hole type, the width of a roller of the existing three-roller five-frame PQF continuous pipe mill is increased by 50mm; meanwhile, in order to solve the problem of weight increase caused by the increase of the core rod specification, a hollow core rod is adopted, so that the transformation cost of the core rod circulating and conveying device is saved;
step five: sizing, namely rounding and sizing the steel pipe by adopting a three-roller sizing mill, wherein when phi 508mm is produced, the sizing mill reduces the diameter of a rough pipe with the diameter of phi 523mm to phi 513-515 mm, the diameter of the cooled rough pipe is phi 508mm, and the wall thickness of the steel pipe is 9.5-40 mm; when the phi 470mm is produced, reducing the diameter of the pierced billet with the phi of 523mm to be phi 475-476 mm by a sizing mill, wherein the diameter of the pierced billet after cooling is phi 470mm, and the wall thickness of the steel pipe is 9.5-40 mm; in order to meet the processing of sizing pass, the nominal diameter of the roller of the three-roller sizing mill is unchanged, and the width of the roller of the existing three-roller sizing mill needs to be increased by 50-60mm;
step six: cooling, wherein the cooling temperature of the steel pipe is less than or equal to 80 ℃;
step seven: sectioning and sawing heads and tails;
step eight: heat treatment, namely, normalizing, tempering or tempering heat treatment is selected according to the steel grade and the performance to be achieved; the adopted heat treatment furnace is a pulse combustion and stepping heat treatment furnace, and the quenching mode is steel pipe rotary internal spraying and external spraying or internal spraying and external spraying and semi-immersion water quenching;
step nine: straightening, namely selecting cold straightening or warm straightening according to different steel types;
step ten: flaw detection, namely selecting modes such as magnetic flux leakage flaw detection, ultrasonic flaw detection, hydrostatic test and the like or a combination of a plurality of modes according to different product standards; the magnetic leakage flaw detection mode adopts a mode that a probe is not moved and a steel pipe advances while rotating; ultrasonic flaw detection is a mode of probe movement and steel pipe rotation;
step eleven: finishing, including oiling, measuring, final inspection, packaging, and the like.
Claims (6)
1. The production process of the large-caliber seamless steel pipe with the diameter larger than phi 457mm is characterized by comprising the following steps:
step one: preparing a tube blank, inspecting and analyzing the tube blank by using the tube blank with the specification phi 450mm, removing the unqualified tube blank, and sawing the tube blank by using a tube blank saw to segment the tube blank;
step two: heating, namely heating the tube blank, wherein the heating temperature of the tube blank is 1150-1280 ℃, and the heating time is 300-360 minutes;
step three: perforating by adopting a two-roller bacterial type perforating machine, wherein the diameter of a perforated nominal capillary tube is phi 580-588 mm, and the perforation expanding rate is 28-30%; the roll gap of the perforating machine is 390-405 mm; the diameter of the top head is phi 450-490 mm; the length of the plug is 800-860 mm, and the forward extension of the plug is 110-230 mm; the distance between the guide plates is 440-460 mm; the wall thickness of the capillary tube is 23-52 mm;
step four: continuous rolling and pipe removal, wherein a three-roller five-frame PQF continuous rolling mill is adopted to carry out wall reduction extension on the steel pipe, and the steel pipe is separated from the core rod through pipe removal machines of three frames; the nominal hole pattern of the mandrel mill is phi 538mm, and the wall reduction is 10-16 mm; the diameter of the core rod is phi 460-520mm; the diameter of the steel pipe which is separated from the pipe separating machine is phi 523mm, and the wall thickness of the steel pipe is 9.5-40 mm;
step five: sizing, namely rounding and sizing the steel pipe by adopting a three-roller sizing mill, wherein when phi 508mm is produced, the sizing mill reduces the diameter of a rough pipe with the diameter of phi 523mm to phi 513-515 mm, the diameter of the cooled rough pipe is phi 508mm, and the wall thickness of the steel pipe is 9.5-40 mm; when the phi 470mm is produced, reducing the diameter of the pierced billet with the phi of 523mm to be phi 475-476 mm by a sizing mill, wherein the diameter of the pierced billet after cooling is phi 470mm, and the wall thickness of the steel pipe is 9.5-40 mm;
step six: cooling, wherein the cooling temperature of the steel pipe is less than or equal to 80 ℃;
step seven: sectioning and sawing heads and tails;
step eight: heat treatment, normalizing and tempering or quenching and tempering heat treatment is carried out by adopting a heat treatment furnace;
step nine: straightening, namely cold straightening or warm straightening is adopted;
step ten: flaw detection, adopting a magnetic flux leakage flaw detection, ultrasonic flaw detection, a water pressure test mode or a combination mode of a plurality of the magnetic flux leakage flaw detection, the ultrasonic flaw detection and the water pressure test modes;
step eleven: finishing, including oiling, measuring, final inspection and packaging.
2. The process for producing the large-caliber seamless steel tube with the diameter larger than phi 457mm according to claim 1, wherein the outlet cone angle of a perforating roller of the two-roller bacterial type perforating machine in the third step is 6 degrees, and the shape of the plug is three-section.
3. The process for producing the large-caliber seamless steel tube with the diameter larger than phi 457mm according to claim 1, wherein the three-roller five-frame PQF tandem mill in the fourth step is in a phi 538mm hole type, the width of a roller is increased by 50mm, and a hollow core rod is adopted.
4. The process for producing the large-caliber seamless steel pipe with the diameter larger than phi 457mm according to claim 1, wherein the nominal diameter of a roller of the three-roller sizing mill in the fifth step is unchanged, and the width of the roller is increased by 50-60mm.
5. The process for producing the large-caliber seamless steel tube with the diameter larger than phi 457mm according to claim 1, wherein the heat treatment furnace in the step eight is a pulse combustion step heat treatment furnace; the quenching mode is steel pipe rotary internal spraying and external spraying or internal spraying and external spraying and semi-immersion water quenching.
6. The process for producing the large-caliber seamless steel pipe with the diameter larger than phi 457mm according to claim 1, wherein the magnetic flux leakage flaw detection mode in the step ten adopts a mode that a probe is not moved and the steel pipe advances while rotating; ultrasonic flaw detection is a mode of probe movement and steel pipe rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310273044.0A CN116460143A (en) | 2023-03-21 | 2023-03-21 | Production process of large-caliber seamless steel pipe with diameter larger than phi 457mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310273044.0A CN116460143A (en) | 2023-03-21 | 2023-03-21 | Production process of large-caliber seamless steel pipe with diameter larger than phi 457mm |
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| Publication Number | Publication Date |
|---|---|
| CN116460143A true CN116460143A (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310273044.0A Pending CN116460143A (en) | 2023-03-21 | 2023-03-21 | Production process of large-caliber seamless steel pipe with diameter larger than phi 457mm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116460143A (en) |
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2023
- 2023-03-21 CN CN202310273044.0A patent/CN116460143A/en active Pending
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