CN109487173B - Corrosion-resistant spiral submerged-arc welded pipe for petroleum transportation and preparation method thereof - Google Patents
Corrosion-resistant spiral submerged-arc welded pipe for petroleum transportation and preparation method thereof Download PDFInfo
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- 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
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- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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Abstract
The invention relates to the technical field of steel pipes for petroleum transportation, in particular to a corrosion-resistant spiral submerged arc welding pipe for petroleum transportation, wherein a steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, and the balance of iron and inevitable impurities. The paint is applied to petroleum transportation and has stronger acid corrosion resistance. Also provides a preparation method thereof, and the spiral submerged arc welded pipe for petroleum transportation with good corrosion resistance is prepared by the method.
Description
Technical Field
The invention relates to the technical field of steel pipes for petroleum transportation, in particular to a corrosion-resistant spiral submerged arc welded pipe for petroleum transportation and a preparation method thereof.
Background
The pipe for the petroleum long-distance pipeline is generally a straight seam or spiral submerged arc welded pipe. Steel pipes for high-strength pipelines are mainly used as longitudinal submerged arc welded pipes in developed countries and regions such as europe, the united states, japan, and the like. China has certain advantages in the manufacturing technology of spiral submerged arc welded pipes. Meanwhile, researches in recent years show that the spiral submerged arc welded pipe has more advantages than a straight submerged arc welded pipe in terms of pipeline crack arrest. Therefore, the development of the high-strength and high-toughness spiral submerged arc welded pipe is a route of an oil and gas long-distance pipeline with Chinese characteristics.
The conventional spiral submerged arc welded pipe has a very thin chromium oxide film, called passive film, on the surface. The film can prevent the metal from being oxidized continuously, so that the welded pipe has stronger corrosion resistance. However, the passive film on the surface of the welded tube is not uniform due to defects, impurities and solutes present in the steelThe passivation film is made fragile in these places and is easily broken in a specific corrosive solution, the broken part becomes an activated anode, the surrounding area is a cathode region, the area of the anode is very small, the current density of the anode is large, the active dissolution is accelerated, and then the passivation film becomes a plurality of needle-like pores, and becomes "pitting". Containing CO2、Cl2The oil gas generates stronger Cl near the cavitation point-Adsorption and faster dissolution of metals when O is present on the surface of the metal2Adsorbed by Cl-Pitting corrosion will develop upon replacement. Due to O2And Cl-Reversible competitive adsorption of (A) to (B) to produce Cl-The complex ion destroys the passivation film, and the complex compound is hydrolyzed to generate complex ion and Cl-. In acidic hydrocarbons, the pH within the etched pores decreases, also causing accelerated dissolution of metal ions.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a corrosion-resistant spiral submerged arc welded pipe for petroleum transportation, which is applied to petroleum transportation and has stronger acid corrosion resistance.
The first purpose of the invention is realized by the following technical scheme:
a corrosion-resistant spiral submerged arc welding pipe for petroleum transportation comprises a steel pipe base material and a steel pipe bottom material, wherein the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, and the balance of iron and inevitable impurities.
By adopting the technical scheme, the chromium content is controlled, a passivation film, namely a chromium oxide film, can be formed, and the corrosion resistance protection is carried out on the surface of the welded pipe. The carbon content is reduced, and meanwhile, the contents of nickel and chromium are adjusted, so that the welded pipe is ensured to have better strength. By introducing and controlling the content of silicon, the welded pipe has better corrosion resistance to concentrated nitric acid, and the corrosion resistance range of the welded pipe is expanded. By introducing and controlling the contents of molybdenum and copper, the welded pipe can resist the corrosion of sulfuric acid, phosphoric acid, formic acid, acetic acid, urea and the like, and the corrosion resistant range of the welded pipe is further expanded; and molybdenum may also improve pitting and crevice corrosion resistance. If the carbon content is decreased and the content of a component is increased in order to enhance the corrosion resistance, the corrosion resistance of the welded pipe is not improved, and the strength of the welded pipe does not reach the standard. But the content proportion of each component is according to the specific proportion listed in the invention, so that the corrosion resistance of the steel can be enhanced while the strength requirement is met.
Preferably, the steel pipe base material comprises the following components in percentage by weight: chromium: 0.80% -1.00%, carbon: 0.01% -0.04%, nickel: 1.0% -1.50%, molybdenum: 0.50% -1.00%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.10% -0.15%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, and the balance of iron and inevitable impurities.
The second purpose of the invention is to provide a corrosion-resistant spiral submerged arc welded pipe for petroleum transportation, which has better intergranular corrosion resistance.
The second purpose of the invention is realized by the following technical scheme:
a corrosion-resistant spiral submerged arc welding pipe for petroleum transportation comprises a steel pipe base material and a steel pipe bottom material, wherein the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, the balance being iron and unavoidable impurities; the steel pipe base material also comprises the following components in percentage by weight: titanium: 0.01% -0.10%; the welding seam also comprises the following components in percentage by weight: titanium: 0.05% -1.00%.
By adopting the technical scheme, the corrosion tendency of the welded pipe is further reduced by introducing and controlling the content of titanium, so that the corrosion resistance of the welded pipe is improved.
The third purpose of the invention is to provide a corrosion-resistant spiral submerged arc welded pipe for petroleum transportation, which has improved stress corrosion resistance.
The third purpose of the invention is realized by the following technical scheme:
a corrosion-resistant spiral submerged arc welding pipe for petroleum transportation comprises a steel pipe base material and a steel pipe bottom material, wherein the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, the balance being iron and unavoidable impurities; the steel pipe base material also comprises the following components in percentage by weight: niobium: 0.005% -0.01%; the welding seam also comprises the following components in percentage by weight: niobium: 0.01 to 0.03 percent.
By adopting the technical scheme, the content of niobium is introduced and controlled, and the stress corrosion resistance of the welded pipe can be improved, so that the corrosion resistance of the welded pipe can be exerted under the action of stress resistance in the petroleum transportation process, and the petroleum is ensured not to be leaked in the petroleum transportation process.
It is a fourth object of the present invention to provide a corrosion-resistant spiral submerged arc welded pipe for petroleum transportation which can improve the surface accuracy of the welded pipe to avoid occurrence of pitting corrosion.
The fourth purpose of the invention is realized by the following technical scheme:
a corrosion-resistant spiral submerged arc welding pipe for petroleum transportation comprises a steel pipe base material and a steel pipe bottom material, wherein the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, the balance being iron and unavoidable impurities; the steel pipe base material also comprises the following components in percentage by weight: selenium: 0.003-0.005%; the welding seam also comprises the following components in percentage by weight: selenium: 0.01 to 0.03 percent.
By adopting the technical scheme, the passive film on the surface of the welded pipe is relatively fragile in the places due to the defects, impurities and the nonuniformity of solute in steel, and is easy to be corroded and damaged in a specific corrosive solution, and the damaged part is activated and dissolved quickly to form 'pitting corrosion'. By introducing selenium and controlling the addition amount of selenium, the surface precision of the welded pipe can be improved, and the defects in the welded pipe are reduced, so that the formation of 'cavitation erosion' points is reduced, and the corrosion resistance of the welded pipe is improved.
The fifth purpose of the invention is to provide a preparation method of the corrosion-resistant spiral submerged arc welded pipe for petroleum transportation, which comprises the following operation steps: uncoiling, flattening, edge milling, pre-bending, forming, inner welding, outer welding, flying shear, pipe end expanding, hydrostatic test, ultrasonic flaw detection, pipe end chamfering and finished product inspection; the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, and the balance of iron and inevitable impurities.
Preferably, the thickness of the steel pipe base material is 25mm, the steel pipe base material is rolled into a tubular body by a hot-rolled coil, and the welding seams of the tubular body are spirally distributed.
Preferably, the steel pipe base material further comprises the following components in percentage by weight: titanium: 0.01% -0.10%; the welding seam also comprises the following components in percentage by weight: titanium: 0.05% -1.00%.
Preferably, the steel pipe base material further comprises the following components in percentage by weight: niobium: 0.005% -0.01%; the welding seam also comprises the following components in percentage by weight: niobium: 0.01 to 0.03 percent.
Preferably, the steel pipe base material further comprises the following components in percentage by weight: selenium: 0.003-0.005%; the welding seam also comprises the following components in percentage by weight: selenium: 0.01 to 0.03 percent.
By adopting the technical scheme, the acid corrosion resistance and the stress corrosion resistance of the spiral submerged arc welded pipe for petroleum transportation are further improved and enhanced.
In conclusion, the invention has the following beneficial effects:
(1) by introducing different components and controlling the proportion of the components, the corrosion resistance of the spiral submerged arc welded pipe for petroleum transportation is improved, the spiral submerged arc welded pipe is suitable for welded pipes for petroleum transportation, and the optimum length of the spiral submerged arc welded pipe in an SSC (stress tolerance test) can reach 1195h without fracture.
(2) The carbon content is reduced, and meanwhile, the contents of nickel and chromium are prepared, so that the purpose of improving the corrosion resistance of the welded pipe is achieved while the welded pipe has better strength.
(3) By introducing and controlling selenium, niobium and titanium, the acid corrosion resistance of the welded pipe is improved.
Detailed Description
Example 1
The corrosion-resistant spiral submerged arc welding pipe for petroleum transportation is prepared by the following operation steps: uncoiling and flattening the large-deformation-resistant hot-rolled coil to prepare for forming the steel pipe; edge milling: the method comprises the steps of rough milling for removing redundant plate edges and finish milling for an X-shaped groove, wherein the purpose of grooving is to ensure that a rolled plate can be completely welded in the welding process, improve the welding speed, improve the appearance of a welding seam, reduce the energy of a welding line, reduce the influence of welding residual stress and welding heat input on the structure and the performance of a welding heat affected zone and improve the performance of the welding heat affected zone; pre-bending; molding: the pre-bent strip steel is made into a spiral cylinder with the required pipe diameter in a three-roller former according to a certain curvature radius; welding: firstly carrying out inner welding three-wire submerged arc welding on an initial joint part of the spirally formed steel pipe, then carrying out four-wire submerged arc welding on an outer welding line at a half pitch, wherein S, P high-toughness submerged arc welding wires and welding flux with low impurity content are adopted in the inner welding process and the outer welding process, and a laser welding line automatic tracking device is adopted; flying shear: cutting the continuously formed and welded steel pipe into steel pipes with required lengths according to requirements; pipe end expanding: cold expanding is carried out within the range of 300mm of the end of the steel pipe, the end of the steel pipe is rounded, the size of the end of the steel pipe is controlled, and the efficiency of on-site pipeline construction is improved; hydrostatic pressure test; ultrasonic flaw detection: carrying out ultrasonic automatic flaw detection and pipe end ultrasonic manual detection on the weld joint; chamfering the pipe end: groove machining is carried out on the end of the steel pipe; and (5) inspecting a finished product. The operations of the steps in the preparation method can be realized by those skilled in the art according to the above description, and are not described herein again.
The steel pipe base material comprises the following components in percentage by weight: chromium: 0.50%, carbon: 0.04%, nickel: 0.5%, molybdenum: 0.25%, copper: 0.10%, silicon: 0.50%, nitrogen: 0.003%; the welding seam comprises the following components in percentage by weight: carbon: 0.20%, nickel: 0.5%, molybdenum: 0.02%, copper: 0.10%, silicon: 0.35 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
The following examples 2 to 19 were conducted in the same manner as in example 1 except that the composition and the content of the steel pipe base metal and the weld bead were different from each other.
Example 2
The steel pipe base material in example 2 includes the following components in percentage by weight: chromium: 0.80%, carbon: 0.01%, nickel: 1.0%, molybdenum: 0.5%, copper: 0.10%, silicon: 0.50%, nitrogen: 0.003%; the welding seam comprises the following components in percentage by weight: carbon: 0.15%, nickel: 0.5%, molybdenum: 0.02%, copper: 0.10%, silicon: 0.35 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
Example 3
The steel pipe base material in example 3 includes the following components in percentage by weight: chromium: 1.00%, carbon: 0.04%, nickel: 1.5%, molybdenum: 1.0%, copper: 0.30%, silicon: 1.00%, nitrogen: 0.01 percent; the welding seam comprises the following components in percentage by weight: carbon: 0.10%, nickel: 1.0%, molybdenum: 0.1%, copper: 0.30%, silicon: 0.8 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
Example 4
The steel pipe base material in example 4 includes the following components in percentage by weight: chromium: 0.95%, carbon: 0.035%, nickel: 1.2%, molybdenum: 0.85%, copper: 0.20%, silicon: 0.85%, nitrogen: 0.007%; the welding seam comprises the following components in percentage by weight: carbon: 0.12%, nickel: 0.85%, molybdenum: 0.08%, copper: 0.20%, silicon: 0.55 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
Example 5
The steel pipe base material in example 5 includes the following components in percentage by weight: chromium: 1.50%, carbon: 0.01%, nickel: 2.0%, molybdenum: 1.5%, copper: 0.30%, silicon: 1.00%, nitrogen: 0.01 percent; the welding seam comprises the following components in percentage by weight: carbon: 0.05%, nickel: 1.0%, molybdenum: 0.1%, copper: 0.30%, silicon: 0.8 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
Example 6
The steel pipe base material in example 6 includes the following components in percentage by weight: chromium: 0.90%, carbon: 0.025%, nickel: 1.45%, molybdenum: 0.75%, copper: 0.25%, silicon: 0.95%, nitrogen: 0.065%; the welding seam comprises the following components in percentage by weight: carbon: 0.13%, nickel: 0.75%, molybdenum: 0.08%, copper: 0.25%, silicon: 0.65 percent; the inevitable impurities S in the welding seam and the steel pipe base metal are less than 0.003 percent, and P is less than 0.01 percent.
Example 7
The welded pipe in example 7 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: titanium: 0.05 percent; the welding seam also comprises the following components in percentage by weight: titanium: 0.50 percent.
Example 8
The welded pipe in example 8 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: titanium: 0.01 percent; the welding seam also comprises the following components in percentage by weight: titanium: 0.05 percent.
Example 9
The welded pipe in example 9 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: titanium: 0.10 percent; the welding seam also comprises the following components in percentage by weight: titanium: 1.00 percent.
Example 10
The welded pipe in example 10 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: niobium: 0.005 percent; the welding seam also comprises the following components in percentage by weight: niobium: 0.01 percent.
Example 11
The welded pipe in example 11 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: niobium: 0.008 percent; the welding seam also comprises the following components in percentage by weight: niobium: 0.02 percent.
Example 12
The welded pipe in example 12 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: niobium: 0.01 percent; the welding seam also comprises the following components in percentage by weight: niobium: 0.03 percent.
Example 13
The welded pipe in example 13 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.003%; the welding seam also comprises the following components in percentage by weight: selenium: 0.01 percent.
Example 14
The welded pipe in example 14 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.005 percent; the welding seam also comprises the following components in percentage by weight: selenium: 0.02 percent.
Example 15
The welded pipe in example 15 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.004%; the welding seam also comprises the following components in percentage by weight: selenium: 0.03 percent.
Example 16
The welded pipe in example 16 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.005%, niobium: 0.008 percent. The welding seam also comprises the following components in percentage by weight: selenium: 0.03%, niobium: 0.03 percent
Example 17
The welded pipe in example 17 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.003%, titanium: 0.1 percent. The welding seam also comprises the following components in percentage by weight: selenium: 0.01%, titanium: 0.05 percent.
Example 18
The welded pipe in example 18 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: titanium: 0.01%, niobium: 0.008 percent. The welding seam also comprises the following components in percentage by weight: titanium: 0.05%, niobium: 0.03 percent
Example 19
The welded pipe in example 19 is different from that in example 1 in that the steel pipe base material further contains the following components in percentage by weight: selenium: 0.01%, niobium: 0.008%, titanium: 0.01 percent. The welding seam also comprises the following components in percentage by weight: titanium: 0.05%, niobium: 0.03%, selenium: 0.01 percent.
Comparative example 1
Comparative example 1 differs from example 1 in that the weight percentage of carbon in the base material component of the steel pipe is 0.06%. The weight percent of carbon in the weld composition was 0.25%.
Comparative example 2
Comparative example 2 is different from example 1 in that the weight percentage of molybdenum in the steel pipe base material component is 1.75%. The weight percentage of molybdenum in the weld components was 0.15%.
Comparative example 3
Comparative example 3 is different from example 1 in that the weight percentage of silicon in the base material component of the steel pipe is 0.25%. The weight percentage of silicon in the weld component was 0.15%.
Comparative example 4
Comparative example 4 is different from example 1 in that the weight percentage of silicon in the base material component of the steel pipe is 1.75%. The weight percentage of silicon in the weld component was 0.95%.
Comparative example 5
Comparative example 5 is different from example 1 in that the weight percentage of nitrogen in the steel pipe base material component is 0.02%.
Comparative example 6
Comparative example 6 is different from example 1 in that the weight percentage of copper in the steel pipe base material composition is 0.4%. The weight percentage of copper in the weld composition was 0.4%.
Comparative example 7
Comparative example 7 is different from example 1 in that the weight percentage of nickel in the steel pipe base material component is 2.50%. The weight percentage of nickel in the weld components was 1.3%.
Performance testing
The welded tubes of examples 1-19 and comparative examples 1-7 were subjected to yield strength and tensile strength tests using the GB/T228 standard, and other mechanical properties were referred to QJ/CTG 24-2015. The test results are shown in tables 1 and 2.
TABLE 1 results of performance test of spiral submerged arc welded pipes for petroleum transportation of examples 1 to 19
TABLE 2 results of performance test of spiral submerged arc welded pipes for petroleum transportation of comparative examples 1 to 7
Table 1 shows that the spiral submerged-arc welding pipe for petroleum transportation prepared by the components and the proportion of the spiral submerged-arc welding pipe achieves balance among various mechanical properties and strength, and can meet the strength requirement of a welded pipe. The probability of the appearance of defects on the surface of the welded pipe is 0.05, and the product has excellent performances. As can be seen from the test results in table 2 and table 1, the components of the present invention have specific requirements, and if the contents of nitrogen, copper, nickel, silicon, molybdenum, and carbon are adjusted to be out of the ranges given in the present invention, the mechanical properties of the welded pipe as a whole will be reduced. In addition, the probability of the surface defects of the welded pipe is increased from 0.05 to 0.3, and the quality of the welded pipe is seriously affected.
SSC resistance test: the welded pipe samples of examples 1 to 19 and comparative examples 1 to 7 were immersed in the test solution for 1200 hours, and 90% of the yield stress was applied as an applied stress to observe the presence or absence of cracking. Wherein the test solution is 20% sodium chloride water solution (liquid temperature 25 deg.C, H)2S: 0.1 atmosphere of pressure, CO2: 0.9 atm) was added acetic acid and sodium acetate to adjust the pH to 3.5. The test results are shown in table 3.
TABLE 3 SSC resistance test results
| Item | Hydrogen sulfide stress corrosion test (SSC) |
| Example 1 | Not broken for 900h and broken for 1000h |
| Example 2 | Not broken for 900h and broken for 1000h |
| Example 3 | Not broken for 900h and broken for 1000h |
| Example 4 | Not broken for 900h and broken for 1000h |
| Example 5 | Not broken for 900h and broken for 1000h |
| Example 6 | Not broken for 900h and broken for 1000h |
| Example 7 | Does not break for 1000h and breaks for 1100h |
| Example 8 | Does not break for 1000h and breaks for 1100h |
| Example 9 | Does not break for 1000h and breaks for 1100h |
| Example 10 | Does not break for 1000h and breaks for 1100h |
| Example 11 | Does not break for 1000h and breaks for 1100h |
| Example 12 | Does not break for 1000h and breaks for 1100h |
| Example 13 | 1100h without fracture and 1150h with fracture |
| Example 14 | 1100h without fracture and 1180h with fracture |
| Example 15 | Does not break for 1000h and breaks for 1100h |
| Example 16 | 1100h without fracture and 1150h with fracture |
| Example 17 | 1100h without fracture and 1150h with fracture |
| Example 18 | 1100h without fracture and 1150h with fracture |
| Example 19 | No break in 1195h and break in 1200h |
| Comparative example 1 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 2 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 3 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 4 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 5 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 6 | The steel plate is not broken for 720h and is broken for 900h |
| Comparative example 7 | The steel plate is not broken for 720h and is broken for 900h |
In comparison with the data in table 3, the comparison between example 1 and comparative examples 1-7 shows that limiting the amount of carbon, molybdenum, silicon, nitrogen, copper, and nickel within the range of protection of the present application is beneficial to improving the corrosion resistance and SSC resistance of the welded pipe. The corrosion resistance of the spiral submerged arc welding pipe for petroleum transportation is greatly improved, and the best corrosion resistance is achieved without breakage within 1195 h. Comparing example 1 with examples 7 to 9, it is seen that the addition of titanium in the present invention reduces the intergranular corrosion tendency of the welded pipe, thereby improving the corrosion resistance of the welded pipe. Comparing example 1 with examples 10 to 12, it is understood that the addition of niobium in the present invention improves the stress corrosion resistance of the welded pipe, so that it can exert its corrosion resistance against stress, thereby making the SSC resistance of examples 10 to 12 equal to that of example 1. Comparing example 1 with examples 13-15, it is seen that selenium improves the corrosion resistance of examples 13-15 over example 1 by improving and reducing the defects present in the welded tube, thereby reducing the points at which "pitting" occurs and increasing the corrosion resistance of the welded tube. As can be seen from the examples 1 and 16 to 19, the corrosion resistance effect of the selenium, niobium and titanium which are combined in pairs and added into the components of the welded pipe is better than that of the selenium, niobium and titanium which are added separately; the SSC resistance is the best with all three (example 19).
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (9)
1. The corrosion-resistant spiral submerged arc welding pipe for petroleum transportation is characterized in that a steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003% -0.01%, niobium: 0.005% -0.01%; the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35% -0.80%, niobium: 0.01% -0.03%; the balance being iron and unavoidable impurities.
2. The corrosion-resistant spiral submerged arc welded pipe for oil transportation according to claim 1, wherein the steel pipe base material comprises the following components in percentage by weight: chromium: 0.80% -1.00%, carbon: 0.01% -0.04%, nickel: 1.0% -1.50%, molybdenum: 0.50% -1.00%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003% -0.01%, niobium: 0.005% -0.008%; the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.10% -0.15%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35% -0.80%, niobium: 0.01 to 0.02 percent, and the balance of iron and inevitable impurities.
3. The corrosion-resistant submerged arc spiral welded pipe for petroleum transportation according to claim 1, wherein the steel pipe base material further comprises the following components in percentage by weight: titanium: 0.01% -0.10%; the welding seam also comprises the following components in percentage by weight: titanium: 0.05% -1.00%.
4. The corrosion-resistant submerged arc spiral welded pipe for petroleum transportation according to claim 1, wherein the steel pipe base material further comprises the following components in percentage by weight: selenium: 0.003-0.005%; the welding seam also comprises the following components in percentage by weight: selenium: 0.01 to 0.03 percent.
5. The preparation method of the corrosion-resistant spiral submerged arc welded pipe for petroleum transportation is characterized by comprising the following operation steps of: uncoiling, flattening, edge milling, pre-bending, forming, inner welding, outer welding, flying shear, pipe end expanding, hydrostatic test, ultrasonic flaw detection, pipe end chamfering and finished product inspection; the steel pipe base material comprises the following components in percentage by weight: chromium: 0.50% -1.50%, carbon: 0.01% -0.04%, nickel: 0.5% -2.00%, molybdenum: 0.25% -1.50%, copper: 0.10% -0.30%, silicon: 0.50% -1.00%, nitrogen: 0.003-0.01% and the balance of iron and unavoidable impurities; the welding seam comprises the following components in percentage by weight: carbon: 0.05% -0.20%, nickel: 0.5% -1.00%, molybdenum: 0.02% -0.10%, copper: 0.10% -0.30%, silicon: 0.35-0.80%, and the balance of iron and inevitable impurities.
6. The method for producing a corrosion-resistant submerged arc spiral welded pipe for petroleum transportation according to claim 5, characterized in that: the thickness of the steel pipe base material is 25mm, the steel pipe base material is rolled into a tubular body by adopting a hot rolling coil plate, and the welding seams of the tubular body are spirally distributed.
7. The method according to claim 5, wherein the steel pipe base material further comprises the following components by weight percent: titanium: 0.01% -0.10%; the welding seam also comprises the following components in percentage by weight: titanium: 0.05% -1.00%.
8. The method according to claim 5, wherein the steel pipe base material further comprises the following components by weight percent: niobium: 0.005% -0.01%; the welding seam also comprises the following components in percentage by weight: niobium: 0.01 to 0.03 percent.
9. The method for producing a corrosion-resistant submerged arc spiral welded pipe for petroleum transportation according to claim 5, characterized in that: the steel pipe base material also comprises the following components in percentage by weight: selenium: 0.003-0.005%; the welding seam also comprises the following components in percentage by weight: selenium: 0.01 to 0.03 percent.
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