CN116752045A - Production method of thick-wall longitudinal submerged arc welded pipe X80Q - Google Patents
Production method of thick-wall longitudinal submerged arc welded pipe X80Q Download PDFInfo
- Publication number
- CN116752045A CN116752045A CN202310768064.5A CN202310768064A CN116752045A CN 116752045 A CN116752045 A CN 116752045A CN 202310768064 A CN202310768064 A CN 202310768064A CN 116752045 A CN116752045 A CN 116752045A
- Authority
- CN
- China
- Prior art keywords
- equal
- temperature
- pipe
- thick
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 238000005496 tempering Methods 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 26
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005204 segregation Methods 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000002378 acidificating effect Effects 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
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- 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 Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a production method of a thick-wall X80Q longitudinal submerged arc welded pipe, which comprises the following chemical components, by weight, C=0.07% -0.09%, si=0.15% -0.25%, mn=1.50% -1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb=0.040% -0.050%, ti=0.01% -0.02%, ni=0.20% -0.30%, mo=0.20% -0.25%, cu=0.15% -0.25%, V=0.030% -0.040%, alt=0.020% -0.040%, and the balance of Fe and unavoidable impurities; the production process of on-line quenching and off-line tempering is adopted to produce a thick-wall 22-56 mm steel plate, after the steel plate is manufactured by JCOE, a thick-wall longitudinal submerged arc welded pipe X80Q with excellent performance is obtained, the yield strength of the steel pipe is 570-650 MPa, the tensile strength is 670-760 MPa, the yield ratio is less than or equal to 0.90, the impact toughness of the pipe body at minus 30 ℃ is 200-350J, the welding seam is 150-200J, the hot area is 200-280J, and the drop hammer shearing area at minus 15 ℃ is 85-95%. The invention solves the problem of embrittlement of the thick-wall X80Q steel pipe welded joint.
Description
Technical Field
The invention belongs to the technical field of steel pipe manufacturing, and relates to a production method of a thick-wall longitudinal submerged arc welded pipe X80Q.
Background
The steel for petroleum and natural gas conveying pipeline is an important steel grade integrating equipment, process and the like. The metallographic structure of the pipeline steel produced by the prior art is mainly an acicular ferrite structure, and the delivery state is generally controlled rolling and cooling, namely, the requirements of high strength, high toughness and low yield ratio of the steel plate are met by controlling the structure form and the acicular ferrite proportion after water cooling. Along with the continuous improvement of pipeline construction and product technical requirements, partial pipeline construction projects also provide requirements for normalized pipelines and double-resistance pipelines, and pipeline products delivered in normalized or quenched and tempered states such as L245NS, X60N, X70Q, X W and the like are synchronously developed and applied, and because quenched and tempered pipeline steel has extremely strict comprehensive technical index requirements for product strength, low-temperature toughness, low-temperature drop hammer, hardness and the like.
The quenching and tempering treatment is a heat treatment mode of carrying out high-temperature tempering (500-650 ℃) after on-line quenching or off-line quenching of the metal material. The steel subjected to quenching and tempering has good toughness, namely comprehensive mechanical properties, and meets the performance requirements under higher use conditions. With the development of the steel industry, there are numerous examples of brittle failure accidents in the prior art, ranging from various small mechanical parts to large bridges, ships, transportation pipelines, and the like. Experimental study shows that when the steel in the use process is lower than a certain critical temperature, the toughness of the steel is rapidly reduced, and brittle fracture is easy to occur, namely the brittle transition temperature. This is in relation to factors such as the chemical composition of the material, grain size, crystal structure and texture state. Some steels generally require tempering in order to achieve good strength and toughness. The main purpose of which is to rapidly cool the austenitized steel to form a supersaturated alpha solid solution. The microalloy elements fully dissolved in the high-temperature tempering are precipitated from the supersaturated alpha solid solution finely and uniformly, so that the strength and hardness of the quenched steel are reduced, and the plasticity and toughness of the steel are greatly improved.
The production of the heat-treated steel pipe is subjected to a heat processing process, and the acicular ferrite is used as a thermodynamic unbalanced structure and has certain sensitivity to secondary heating, so that the original structure and performance of the pipeline steel are seriously changed, and the precipitation strengthening and fine grain strengthening effects are reduced, thereby causing serious deterioration of mechanical properties. To ensure the overall performance of the pipe, it is necessary to restore the properties of the material, in particular the low-temperature toughness, by means of thermal refining. Therefore, the influence of the quenching and tempering process on the structure and the performance of the X80Q pipeline steel is studied, and the quenching and tempering process has important significance for the actual production of the X80Q heat treatment type pipeline steel.
Chinese patent CN103266287a discloses a quenched and tempered pipeline steel plate and a production method thereof, and the chemical components of the disclosed pipeline steel in weight percentage are C:0.08 to 0.12 percent of Si:0.20 to 0.40 percent of Mn:1.10 to 1.60 percent, P is less than or equal to 0.008 percent, S is less than or equal to 0.002 percent, ti:0.010% -0.030%, al:0.020% -0.055%, ni:0.20% -0.50%, mo:0.20% -0.50%, V:0.03 to 0.06 percent of Nb:0.02% -0.05%, cr:0.20 to 0.50 percent. The method has the advantages of adding more noble alloy, high manufacturing cost, no use of industrial mass production and no tempering process.
Chinese patent CN105695898A discloses an X80Q hot rolled thick plate for floating LNG pipeline and a production method thereof, and the invention adopts a low-temperature tempering process, the tempering temperature is 470-560 ℃, the problem of high-temperature tempering brittleness is not solved, and the high-temperature tempering is generally 600-650 ℃.
Chinese patent CN102235554a discloses an L485Q (X80Q) grade pipeline steel pipe for low temperature acidic environment and a manufacturing method thereof, which belongs to the field of production of seamless steel pipes, and does not use a longitudinal submerged arc welded pipe, and does not mention a heat treatment process of the steel pipe.
Disclosure of Invention
The invention aims to provide a production method of a thick-wall X80Q longitudinal submerged arc welded pipe, which solves the bottleneck of the production process of the existing thick-wall X80Q steel plate and the welding problem in the manufacturing process of a steel pipe, adopts the production process of on-line quenching and off-line tempering to produce a thick-wall 22-56 mm steel plate, and obtains the thick-wall longitudinal submerged arc welded pipe X80Q with excellent performance after being manufactured by JCOE, wherein the yield strength of the steel pipe is 570-650 MPa, the tensile strength is 670-760 MPa, the yield ratio is less than or equal to 0.90, the impact toughness of the pipe body is 200-350J, the welding seam is 150-200J, the hot area is 200-280J, and the drop weight shearing area at 15 ℃ is 85-95%.
The technical scheme of the invention is as follows:
the production method of the thick-wall X80Q longitudinal submerged arc welded pipe comprises the following chemical components of, by weight, C=0.07% -0.09%, si=0.15% -0.25%, mn=1.50% -1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb=0.040% -0.050%, ti=0.01% -0.02%, ni=0.20% -0.30%, mo=0.20% -0.25%, cu=0.15% -0.25%, V=0.030% -0.040%, alt=0.020% -0.040%, and the balance of Fe and unavoidable impurities; comprises the following process steps of
(1) Steelmaking continuous casting: according to clean steel production control, the superheat degree is 8-15 ℃, the electromagnetic stirring current is 230-280A, the frequency is 5-6.5 HZ, the dynamic soft reduction is 4-6 mm, the section of the blank is 350X 2500mm, and the center segregation C class is less than or equal to 0.5;
(2) Rolling: setting the thickness of the intermediate blank to be more than or equal to 3 times of the thickness of a finished product, wherein the initial rolling temperature at one stage is 1120-1160 ℃, the final rolling temperature is more than or equal to 980 ℃, the number of passes is 5-7, and the accumulated reduction rate is more than or equal to 50%; the initial rolling temperature of the two stages is 820-860 ℃, the final rolling temperature is 760-780 ℃, the number of passes is 7-9, and the accumulated rolling reduction is more than or equal to 60%;
(3) And (3) cooling: adopting online DQ quenching, and starting cooling at 700-740 ℃, wherein the cooling rate is 25-30 ℃, and the reddening temperature is 200-360 ℃;
(4) Tempering: tempering temperature is 600-650 ℃, heat preservation time is 120-180 min, and air cooling is carried out to normal temperature after tempering;
(5) And (3) pipe manufacturing: adopting a JCOE process to manufacture a pipe, wherein the steps comprise edge milling, JCO forming, pre-welding, inner welding, outer welding and diameter expanding, the groove height on the edge milling is 10.75-11.25 mm, the blunt edge thickness is 8.75-9.25 mm, the forming pressing passes are 30-42, the welding speed V=120-140 cm/min of four-wire submerged arc automatic welding, and the line energy is 45-60 kJ/cm;
(6) Annealing the steel tube: the annealing temperature is 600-650 ℃, the furnace time is 120-180 min, the temperature is controlled to 350 ℃ along with the furnace, and the steel pipe with the thick wall of 22-56 mm, the yield strength of 570-650 MPa, the tensile strength of 670-760 MPa, the yield ratio of less than or equal to 0.90, the impact toughness of the pipe body at minus 30 ℃ of 200-350J, the welding seam of 150-200J, the hot area of 200-280J and the drop hammer shearing area of minus 15 ℃ of 85-95% is obtained through discharging and air cooling.
The invention has the beneficial effects that: (1) The Mo+Ni+Nb component system is adopted, so that the functions of fine crystal, precipitation and solid solution strengthening of Mo, ni and Nb are fully utilized, the mechanical property of the steel plate is improved, and the problems of high-temperature tempering brittleness and softening of the steel pipe are solved; (2) The invention adopts on-line quenching, has low process cost and short delivery cycle; (3) The cooling process provided by the invention obtains a complex phase structure, 30% -45% martensitic structure, 30% -40% bainitic structure and 10% -20% ferritic structure, and solves the problem of low DWTT shearing area of thick-wall quenched and tempered pipeline steel; (4) The problem of embrittlement of the welded joint of the thick-wall X80Q steel pipe is solved by a small-angle groove and low-line energy rapid welding method.
Drawings
FIG. 1 is a metallographic structure of the steel of example 1.
Detailed Description
The present invention will be further described with reference to examples.
Example 1: production of phi 1016X 33mm X80Q longitudinal submerged arc welded pipe
The steel comprises the chemical components of c=0.08%, si=0.22%, mn=1.55%, p=0.012%, s=0.002%, nb=0.048%, ti=0.012%, ni=0.25%, mo=0.22%, cu=0.18%, v=0.038%, alt=0.025%, and the balance Fe and unavoidable impurities. And (3) key technology control:
(1) Steelmaking continuous casting: according to clean steel production control, the superheat degree is 10 ℃, the electromagnetic stirring current is 260A, the frequency is 5.3HZ, the dynamic soft reduction is 5.2mm, the section of the blank is 350X 2500mm, and the center segregation C is 0.5;
(2) Rolling: setting 120mm of intermediate billet, wherein the initial rolling temperature of one stage is 1140 ℃, the final rolling temperature is 988 ℃, the number of passes is 7, and the accumulated rolling reduction is 65.7%. The two-stage rolling temperature is 855 ℃, the final rolling temperature is 772 ℃, the rolling passes are 7, and the accumulated rolling reduction is 72.5%;
(3) And (3) cooling: adopting online DQ quenching, starting cooling at 732 ℃, cooling rate of 26.8 ℃ and returning to red at 320 ℃;
(4) Tempering: tempering temperature is 620 ℃, heat preservation time is 135min, and air cooling is carried out to normal temperature after tempering;
(5) And (3) pipe manufacturing: the method adopts a JCOE process for manufacturing the pipe, and mainly comprises the steps of edge milling, JCO forming, pre-welding, inner welding, outer welding and expanding. The groove height on the milling edge is 11.2mm, the blunt edge thickness is 9.1mm, the forming pressing pass is 35 times, the welding speed V=130 cm/min of four-wire submerged arc automatic welding is 52kJ/cm;
(6) Annealing the steel tube: the annealing temperature is 630 ℃, the furnace time is 150min, the temperature is controlled to 350 ℃ along with the furnace, and the furnace is taken out for air cooling.
The mechanical properties of the obtained steel pipes are shown in Table 1.
Example 2: production of phi 1219X 56mm X80Q longitudinal submerged arc welded pipe
The chemical composition content of the steel c=0.08%, si=0.22%, mn=1.52%, p=0.011%, s=0.001%, nb=0.048%, ti=0.018%, ni=0.28%, mo=0.23%, cu=0.22%, v=0.038%, alt=0.025%, the balance being Fe and unavoidable impurities. And (3) key technology control:
(1) Steelmaking continuous casting: according to clean steel production control, the superheat degree is 9.5 ℃, the electromagnetic stirring current is 245A, the frequency is 5.2HZ, the dynamic soft reduction is 5.8mm, the section of the blank is 350X 2500mm, and the center segregation C is 0.5;
(2) Rolling: setting 183mm of intermediate billet, and setting the initial rolling temperature at 1140 ℃ at one stage, the final rolling temperature at 985 ℃, carrying out pass 7 times and the accumulated rolling reduction rate at 52%. The initial rolling temperature of the two stages is 830 ℃, the final rolling temperature is 768 ℃, the number of passes is 9, and the accumulated rolling reduction is 69.2%;
(3) And (3) cooling: adopting online DQ quenching, and starting to cool at 710 ℃, wherein the cooling rate is 28.6 ℃, and the redback temperature is 312 ℃;
(4) Tempering: tempering temperature is 640 ℃, heat preservation time is 176min, and air cooling is carried out to normal temperature after tempering;
(5) And (3) pipe manufacturing: the method adopts a JCOE process for manufacturing the pipe, and mainly comprises the steps of edge milling, JCO forming, pre-welding, inner welding, outer welding and expanding. The groove height on the milling edge is 11.2mm, the blunt edge thickness is 8.9mm, the forming pressing pass is 36 times, the welding speed V=128 cm/min of four-wire submerged arc automatic welding is 48KJ/cm;
(6) Annealing the steel tube: the annealing temperature is 640 ℃, the furnace time is 160min, the temperature is controlled to 350 ℃ along with the furnace, and the furnace is taken out for air cooling.
The mechanical properties of the obtained steel pipes are shown in Table 1.
TABLE 1X 80Q steel tube mechanical property detection results
。
Claims (1)
1. A production method of thick-wall X80Q longitudinal submerged arc welded pipe is characterized by comprising the following steps: the steel comprises the following chemical components, by weight, C=0.07% -0.09%, si=0.15% -0.25%, mn=1.50% -1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb=0.040% -0.050%, ti=0.01% -0.02%, ni=0.20% -0.30%, mo=0.20% -0.25%, cu=0.15% -0.25%, V=0.030% -0.040%, alt=0.020% -0.040%, and the balance Fe and unavoidable impurities; comprises the following process steps of
(1) Steelmaking continuous casting: according to clean steel production control, the superheat degree is 8-15 ℃, the electromagnetic stirring current is 230-280A, the frequency is 5-6.5 HZ, the dynamic soft reduction is 4-6 mm, the section of the blank is 350X 2500mm, and the center segregation C class is less than or equal to 0.5;
(2) Rolling: setting the thickness of the intermediate blank to be more than or equal to 3 times of the thickness of a finished product, wherein the initial rolling temperature at one stage is 1120-1160 ℃, the final rolling temperature is more than or equal to 980 ℃, the number of passes is 5-7, and the accumulated reduction rate is more than or equal to 50%; the initial rolling temperature of the two stages is 820-860 ℃, the final rolling temperature is 760-780 ℃, the number of passes is 7-9, and the accumulated rolling reduction is more than or equal to 60%;
(3) And (3) cooling: adopting online DQ quenching, and starting cooling at 700-740 ℃, wherein the cooling rate is 25-30 ℃, and the reddening temperature is 200-360 ℃;
(4) Tempering: tempering temperature is 600-650 ℃, heat preservation time is 120-180 min, and air cooling is carried out to normal temperature after tempering;
(5) And (3) pipe manufacturing: adopting a JCOE process to manufacture a pipe, wherein the steps comprise edge milling, JCO forming, pre-welding, inner welding, outer welding and diameter expanding, the groove height on the edge milling is 10.75-11.25 mm, the blunt edge thickness is 8.75-9.25 mm, the forming pressing passes are 30-42, the welding speed V=120-140 cm/min of four-wire submerged arc automatic welding, and the line energy is 45-60 kJ/cm;
(6) Annealing the steel tube: the annealing temperature is 600-650 ℃, the furnace time is 120-180 min, the temperature is controlled to 350 ℃ along with the furnace, and the steel pipe with the thick wall of 22-56 mm, the yield strength of 570-650 MPa, the tensile strength of 670-760 MPa, the yield ratio of less than or equal to 0.90, the impact toughness of the pipe body at minus 30 ℃ of 200-350J, the welding seam of 150-200J, the hot area of 200-280J and the drop hammer shearing area of minus 15 ℃ of 85-95% is obtained through discharging and air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310768064.5A CN116752045A (en) | 2023-06-27 | 2023-06-27 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310768064.5A CN116752045A (en) | 2023-06-27 | 2023-06-27 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116752045A true CN116752045A (en) | 2023-09-15 |
Family
ID=87953024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310768064.5A Withdrawn CN116752045A (en) | 2023-06-27 | 2023-06-27 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116752045A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343715A (en) * | 2008-09-03 | 2009-01-14 | 天津钢管集团股份有限公司 | High-strength high-ductility X70 thick-wall seamless pipeline steel and manufacturing method |
| CN102465236A (en) * | 2010-11-18 | 2012-05-23 | 中国石油天然气集团公司 | Method for producing X70 or X80 high-strain steel tube |
| CN103627980A (en) * | 2013-11-25 | 2014-03-12 | 首钢总公司 | Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof |
| CN104726792A (en) * | 2015-03-13 | 2015-06-24 | 攀钢集团成都钢钒有限公司 | Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof |
| CN106148846A (en) * | 2016-08-19 | 2016-11-23 | 山东钢铁股份有限公司 | A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method |
| CN108531814A (en) * | 2018-05-22 | 2018-09-14 | 湖南华菱湘潭钢铁有限公司 | A kind of preparation method of heavy caliber X80 straight-line joint submerged arc welding tubes |
| CN108637603A (en) * | 2018-05-12 | 2018-10-12 | 首钢集团有限公司 | A method of improving X70 hot-bending bends welding point low-temperature impact toughness |
| CN109402500A (en) * | 2018-10-08 | 2019-03-01 | 鞍钢股份有限公司 | The hot-bending bends of low-temperature good toughness X80 Wide and Heavy Plates and its production method |
| CN109536831A (en) * | 2018-11-28 | 2019-03-29 | 张家港宏昌钢板有限公司 | Hot-bending bends main pipe X80 hot rolled steel plate and its manufacturing method |
| CN111286675A (en) * | 2020-03-31 | 2020-06-16 | 湖南华菱湘潭钢铁有限公司 | Production method of X80 hot rolled steel plate for large-caliber hot-bending pipe |
| CN113604754A (en) * | 2021-06-24 | 2021-11-05 | 武汉钢铁有限公司 | Low-cost high-performance X80-grade hot-bending elbow steel and preparation method and application thereof |
| CN115008135A (en) * | 2022-06-21 | 2022-09-06 | 湖南华菱湘潭钢铁有限公司 | Production method of large-wall-thickness large-caliber longitudinal submerged arc welded pipe L555M |
| CN116254475A (en) * | 2021-12-09 | 2023-06-13 | 中国石油天然气集团有限公司 | Thick-wall straight-seam steel pipe for deep-sea pipeline and processing method thereof |
| CN116275891A (en) * | 2023-02-15 | 2023-06-23 | 湖南胜利湘钢钢管有限公司 | Production method of thick-wall large-caliber longitudinal submerged arc welded pipe X80HD |
-
2023
- 2023-06-27 CN CN202310768064.5A patent/CN116752045A/en not_active Withdrawn
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343715A (en) * | 2008-09-03 | 2009-01-14 | 天津钢管集团股份有限公司 | High-strength high-ductility X70 thick-wall seamless pipeline steel and manufacturing method |
| CN102465236A (en) * | 2010-11-18 | 2012-05-23 | 中国石油天然气集团公司 | Method for producing X70 or X80 high-strain steel tube |
| CN103627980A (en) * | 2013-11-25 | 2014-03-12 | 首钢总公司 | Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof |
| CN104726792A (en) * | 2015-03-13 | 2015-06-24 | 攀钢集团成都钢钒有限公司 | Low-welding-crack-sensitivity high-strength seamless steel tube and manufacturing method thereof |
| CN106148846A (en) * | 2016-08-19 | 2016-11-23 | 山东钢铁股份有限公司 | A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method |
| CN108637603A (en) * | 2018-05-12 | 2018-10-12 | 首钢集团有限公司 | A method of improving X70 hot-bending bends welding point low-temperature impact toughness |
| CN108531814A (en) * | 2018-05-22 | 2018-09-14 | 湖南华菱湘潭钢铁有限公司 | A kind of preparation method of heavy caliber X80 straight-line joint submerged arc welding tubes |
| CN109402500A (en) * | 2018-10-08 | 2019-03-01 | 鞍钢股份有限公司 | The hot-bending bends of low-temperature good toughness X80 Wide and Heavy Plates and its production method |
| CN109536831A (en) * | 2018-11-28 | 2019-03-29 | 张家港宏昌钢板有限公司 | Hot-bending bends main pipe X80 hot rolled steel plate and its manufacturing method |
| CN111286675A (en) * | 2020-03-31 | 2020-06-16 | 湖南华菱湘潭钢铁有限公司 | Production method of X80 hot rolled steel plate for large-caliber hot-bending pipe |
| CN113604754A (en) * | 2021-06-24 | 2021-11-05 | 武汉钢铁有限公司 | Low-cost high-performance X80-grade hot-bending elbow steel and preparation method and application thereof |
| CN116254475A (en) * | 2021-12-09 | 2023-06-13 | 中国石油天然气集团有限公司 | Thick-wall straight-seam steel pipe for deep-sea pipeline and processing method thereof |
| CN115008135A (en) * | 2022-06-21 | 2022-09-06 | 湖南华菱湘潭钢铁有限公司 | Production method of large-wall-thickness large-caliber longitudinal submerged arc welded pipe L555M |
| CN116275891A (en) * | 2023-02-15 | 2023-06-23 | 湖南胜利湘钢钢管有限公司 | Production method of thick-wall large-caliber longitudinal submerged arc welded pipe X80HD |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104357754B (en) | A kind of corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof | |
| CN105463324B (en) | A kind of thick-specification high-tenacity pipe line steel and its manufacture method | |
| CN107747068B (en) | A kind of heat-resistance stainless steel seamless pipe and preparation method thereof | |
| WO2014201887A1 (en) | Ht550 steel plate with ultrahigh toughness and excellent weldability and manufacturing method therefor | |
| CN109536846B (en) | High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof | |
| CN102560284B (en) | High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof | |
| WO2022052335A1 (en) | Thick low-carbon-equivalent high-toughness wear-resistant steel plate and manufacturing method therefor | |
| WO2016095616A1 (en) | Good fatigue- and crack growth-resistant steel plate and manufacturing method therefor | |
| CN110195193B (en) | 800 MPa-grade quenched and tempered steel plate with low cost, high toughness and excellent weldability and manufacturing method thereof | |
| CN112226699B (en) | Production method of acid-resistant pipeline steel | |
| CN102400039A (en) | Slurry feed line steel with good low-temperature toughness and manufacturing method thereof | |
| CN103695807B (en) | Strong X100 Pipeline Steel Plate of superelevation that crack arrest is excellent and preparation method thereof | |
| WO2012113119A1 (en) | Method for producing x90 steel grade elbow pipe and pipe fittings | |
| CN1318631C (en) | Method for producing high strength high toughness X80 pipeline steel and its hot-rolled plate | |
| WO2022214107A1 (en) | Method for rolling high-toughness high-strength low-alloy steel | |
| CN108796362A (en) | X70 pipe line steels and its manufacturing method with the anti-dynamic tear performance of superior low temperature | |
| CN111349859B (en) | Large-thickness 500 MPa-level high-Z-direction laminar-performance low-temperature container steel plate rolled by composite blank and manufacturing method thereof | |
| CN115094315A (en) | Economical niobium-chromium reinforced 420 MPa-level bridge steel plate and production method thereof | |
| CN107974622A (en) | Straight-line joint submerged arc welding tube X80 Pipeline Steel Plates and the production method of a kind of thickness >=26.4mm | |
| CN113106346B (en) | High-strength seamless line pipe and preparation method thereof | |
| CN111979499A (en) | Production method of low-cost Q460C thick steel plate | |
| WO2023087979A1 (en) | X80-grade hot-bent elbow having excellent welding performance, and manufacturing method therefor | |
| CN111118410A (en) | Thick-wall large-caliber high-steel grade pipeline pipe with thickness of 40-60 mm and manufacturing method thereof | |
| CN116752045A (en) | Production method of thick-wall longitudinal submerged arc welded pipe X80Q | |
| CN114875331B (en) | 610 MPa-grade thick steel plate with excellent core fatigue performance and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230915 |