CN115555407A - Economical manufacturing method for producing BNSL245NS with wall thickness of less than 16mm by online normalizing process - Google Patents
Economical manufacturing method for producing BNSL245NS with wall thickness of less than 16mm by online normalizing process Download PDFInfo
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- CN115555407A CN115555407A CN202211277242.6A CN202211277242A CN115555407A CN 115555407 A CN115555407 A CN 115555407A CN 202211277242 A CN202211277242 A CN 202211277242A CN 115555407 A CN115555407 A CN 115555407A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000004513 sizing Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000011159 matrix material Substances 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000033764 rhythmic process Effects 0.000 claims description 2
- 238000009785 tube rolling Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or 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
- B21B45/004—Heating the product
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses an economical manufacturing method for BNS/L245NS with a wall thickness of less than 16mm by an online normalizing process, which adopts a circular tube blank of a BNS/L245NS pipeline tube as a raw material, and the circular tube blank comprises the following chemical components in percentage by weight: c0.09-0.12; si0.30-0.4; mn1.05-1.25; p is less than or equal to 0.018; s is less than or equal to 0.003; 0.01 to 0.02 percent of Ti0; the balance of matrix Fe and undetected trace impurity elements; the process flow comprises the following steps: heating a pipe blank → perforating → continuous rolling → sizing → cooling → sawing → detecting flaw → water pressure → manual inspection → detection and analysis. The product of the invention has the characteristics of low production cost, energy saving, environmental protection, stable mechanical property of the steel pipe and good matching of toughness and toughness.
Description
Technical Field
The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to an economical manufacturing method for producing BNSL245NS with the wall thickness of less than 16mm by an online normalizing process.
Background
With the continuous extension of the west-east gas transmission engineering, the number of newly built and put into use natural gas transmission stations in various places is gradually increased in recent years, and the BNS-grade pipeline pipe is widely applied to acid service and hydrogen transmission pipeline engineering and has good mechanical property and technological property. With the development of gas storage and transportation technologies, BNS-grade pipelines have been laid successfully in various geological and geomorphic complex regional environments. The series of seamless steel pipes has large market demand, optimizes the chemical cost of the BNS-grade pipe and the production process, improves the cost performance of products, and simultaneously realizes the aims of low carbon, energy conservation and environmental protection. The invention aims to provide an economical manufacturing method for producing BNS/L245NS with the wall thickness of less than 16mm by an online normalizing process.
Disclosure of Invention
The invention aims to provide an economical manufacturing method for producing BNS/L245NS with the wall thickness of less than 16mm by an online normalizing process.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to an economical manufacturing method for BNSL245NS with the wall thickness of less than 16mm by an online normalizing process, which adopts a BNS/L245NS pipeline pipe round pipe blank, puts the round pipe blank into an annular heating furnace, and heats the round pipe blank by a preheating section, a heating section and a soaking section, wherein the temperature of the preheating section is as follows: 750-1000 ℃, and the temperature of the heating section is as follows: 950-1200 ℃, and the temperature of a soaking section is as follows: 1200-1250 ℃; and (3) perforating the uniformly heated round tube billet by using a perforating machine, continuously rolling by using a PQF hot continuous rolling unit, sizing by using a sizing unit, controlling the rhythm of tube rolling, ensuring that the temperature of the seamless steel tube coming out of the sizing unit is more than 830 ℃, then performing air cooling on the steel tube on a cooling bed, performing sizing and saw cutting according to the required length and size, and performing flaw detection, water pressure, manual inspection and mechanical property detection and analysis, and after inspection and detection, obtaining the finished seamless steel tube for the BNS/L245NS pipeline produced by the online process after the dimensional precision, the surface quality and the mechanical properties are qualified.
Further, the BNS/L245NS pipeline pipe circular tube blank comprises the following chemical components in percentage by mass: 0.09-0.12% of C, si:0.30-0.40%, mn:1.05-1.25%, P: less than or equal to 0.018%, S: less than or equal to 0.003 percent, ti:0.01 to 0.02 percent; the balance of matrix Fe and undetected trace impurity elements.
Furthermore, the temperature after perforation is more than or equal to 1150 ℃, and the temperature after continuous rolling is more than or equal to 980 ℃.
Further, the total heating time was controlled to 4 hours.
Further, the specific performance indexes of the steel pipe are as follows: yield strength: 245 to 450MPa; tensile strength: 415-655 MPa; yield ratio: less than or equal to 0.80; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃: AKV is more than or equal to 80J/cm 2 (ii) a Grain size: grade 7.0 or more.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the chemical components adopt a C + Mn + Ti alloying system, so that the material is subjected to solid solution strengthening and fine grain strengthening, the strength and the impact toughness of the material are improved, and the alloy cost is greatly reduced; BNS/L245NS with the wall thickness of less than 16mm is produced by an online normalizing process to realize low-carbon production, the product performance meets the API 5L standard requirement, and the carbon equivalent CEpcm in steel is less than or equal to 0.19.
(2) A low-temperature heating system is adopted, the round tube blank is loaded into an annular heating furnace and is heated by a preheating section, a heating section and a soaking section, and the final soaking section temperature is realized as follows: 1200-1250 ℃ and the total heating time is controlled to be 4 hours.
(3) The temperature after perforation is more than or equal to 1150 ℃, the temperature of the continuous rolling mill is more than or equal to 980 ℃, the temperature of the sizing unit is more than or equal to 830 ℃, the temperature of the key process is controlled, the online normalizing process production of products is realized, the steel pipe has excellent performances, and the specific performance indexes are as follows: yield strength: 245 to 450MPa; tensile strength: 415-655 MPa; yield ratio: less than or equal to 0.80; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃: AKV is more than or equal to 80J/cm2; grain size: grade 7.0 or more.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a photograph of the microstructure of example 1;
FIG. 2 is a photograph of the microstructure of example 2;
FIG. 3 is a photograph of the microstructure of example 3.
Detailed Description
The present invention will be described in further detail with reference to examples 1 to 3.
The BNS/L245NS pipeline pipe round tube billet with qualified chemical components and quality ensures that the carbon equivalent CE in the steel pcm ≤0.19。
The production process flow sequence is as follows: heating a pipe blank → perforating → continuous rolling → sizing → cooling → sawing → detecting flaw → water pressure → manual inspection → detection and analysis.
The specific production process flow is briefly described as follows:
1. producing the L360N/X52N pipeline pipe round pipe billets with qualified chemical components and quality so as to ensure the carbon equivalent CE in the steel pcm ≤0.19。
2. Loading the circular tube blank into an annular heating furnace, heating the circular tube blank by a preheating section, a heating section and a soaking section, wherein the temperature of the preheating section is as follows: 750-1000 ℃, and the temperature of the heating section is as follows: 950-1200 ℃, and the temperature of a soaking section is as follows: 1200-1250 ℃.
3. The circular tube blank is taken out of the annular heating furnace and is sent into a puncher for punching, the consistency of rolling central lines of the puncher body and front and rear platforms is ensured, and the temperature after punching is ensured to be more than or equal to 1150 ℃.
4. And (3) feeding the perforated hollow billet into a PQF hot continuous rolling unit for continuous rolling, and ensuring that the temperature of the hollow billet before entering the continuous rolling unit is more than or equal to 980 ℃.
5. According to the different wall thicknesses of the steel pipes, the sizing unit selects different numbers of the racks for sizing, and the temperature of the steel pipes after being sized is guaranteed to be more than or equal to 830 ℃.
6. And (3) after the steel pipe is taken out of the sizing unit, performing air cooling on a cooling bed, performing saw cutting, flaw detection, water pressure, manual inspection and sampling after the steel pipe is air cooled to room temperature, and performing detection and analysis on chemical components and mechanical properties.
The production specification of the on-line normalizing process is as follows: (outer diameter of steel pipe X wall thickness of steel pipe X length of steel pipe) 168mm X12.7 mm X12000 mm (example 1), 114mm X11 mm X12000 mm (example 2), 114mm X15 mm X11500 mm (example 3) BNS/L245NS seamless steel pipes were sampled and examined, and the results of chemical component test (weight percentage content) are shown in Table 2, the results of mechanical property test and Table 3, the results of metallographic property test are shown in Table 4, and the photographs of microstructure are shown in FIGS. 1 to 3.
TABLE 2 chemical composition test results (wt%) of tube blanks
| C | Si | Mn | P | S | Ti | CE pcm | |
| Example 1 | 0.10 | 0.33 | 1.10 | 0.011 | 0.002 | 0.013 | 0.160 |
| Example 2 | 0.09 | 0.31 | 1.19 | 0.013 | 0.003 | 0.011 | 0.159 |
| Example 3 | 0.11 | 0.30 | 1.15 | 0.014 | 0.002 | 0.012 | 0.177 |
TABLE 3 mechanical Property test results of seamless steel pipes
| R t0.5 (MPa) | R m (MPa) | R t0.5 /R m | A(％) | A KV (0 ℃, transverse, J/cm) 2 ) | |
| Example 1 | 301 | 480 | 0.63 | 39 | 150,165,155 |
| Example 2 | 310 | 500 | 0.62 | 40 | 147,153,176 |
| Example 3 | 308 | 495 | 0.62 | 43 | 163,172,170 |
TABLE 4 metallographic properties of seamless steel tubes test results (grade)
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A manufacturing method for BNSL245NS with the wall thickness of less than 16mm by an economical on-line normalizing process is characterized in that a BNS/L245NS pipeline tube round tube blank is adopted, the round tube blank is put into an annular heating furnace and is heated by a preheating section, a heating section and a soaking section, the temperature of the preheating section is as follows: 750-1000 ℃, and the temperature of the heating section is as follows: 950-1200 ℃, and the temperature of a soaking section is as follows: 1200-1250 ℃; and (3) perforating the uniformly heated round tube billet by using a perforating machine, continuously rolling by using a PQF hot continuous rolling unit, sizing by using a sizing unit, controlling the rhythm of tube rolling, ensuring that the temperature of the seamless steel tube coming out of the sizing unit is more than 830 ℃, then performing air cooling on the steel tube on a cooling bed, performing sizing and saw cutting according to the required length and size, and performing flaw detection, water pressure, manual inspection and mechanical property detection and analysis, and after inspection and detection, obtaining the finished seamless steel tube for the BNS/L245NS pipeline produced by the online process after the dimensional precision, the surface quality and the mechanical properties are qualified.
2. The economical manufacturing method for BNSL245NS with the wall thickness of less than 16mm by adopting the on-line normalizing process as claimed in claim 1, wherein the chemical components of the BNS/L245NS pipeline circular tube blank in percentage by mass are as follows: c0.09-0.12%, si:0.30-0.40%, mn:1.05-1.25%, P: less than or equal to 0.018%, S: less than or equal to 0.003 percent, ti:0.01 to 0.02 percent; the balance of Fe matrix and trace impurity elements which can not be detected.
3. The economical manufacturing method for BNSL245NS with the wall thickness of less than 16mm by the online normalizing process according to claim 1, characterized in that the temperature after perforation is more than or equal to 1150 ℃ and the temperature in continuous rolling mill is more than or equal to 980 ℃.
4. The economical manufacturing process for BNSL245NS with a wall thickness of less than 16mm according to claim 1, wherein the total heating time is controlled to 4 hours.
5. The economical manufacturing method for BNSL245NS with the wall thickness of less than 16mm by adopting the on-line normalizing process according to claim 1, wherein the specific performance indexes of the steel pipe are as follows: yield strength: 245 to 450MPa; tensile strength: 415-655 MPa; yield ratio: less than or equal to 0.80; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃: AKV is more than or equal to 80J/cm 2 (ii) a Grain size: grade 7.0 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211277242.6A CN115555407A (en) | 2022-10-18 | 2022-10-18 | Economical manufacturing method for producing BNSL245NS with wall thickness of less than 16mm by online normalizing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211277242.6A CN115555407A (en) | 2022-10-18 | 2022-10-18 | Economical manufacturing method for producing BNSL245NS with wall thickness of less than 16mm by online normalizing process |
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| Publication Number | Publication Date |
|---|---|
| CN115555407A true CN115555407A (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211277242.6A Pending CN115555407A (en) | 2022-10-18 | 2022-10-18 | Economical manufacturing method for producing BNSL245NS with wall thickness of less than 16mm by online normalizing process |
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| Country | Link |
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| CN (1) | CN115555407A (en) |
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- 2022-10-18 CN CN202211277242.6A patent/CN115555407A/en active Pending
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