WO2006003953A1 - Fe-Ni合金素管及びその製造方法 - Google Patents
Fe-Ni合金素管及びその製造方法 Download PDFInfo
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- WO2006003953A1 WO2006003953A1 PCT/JP2005/011992 JP2005011992W WO2006003953A1 WO 2006003953 A1 WO2006003953 A1 WO 2006003953A1 JP 2005011992 W JP2005011992 W JP 2005011992W WO 2006003953 A1 WO2006003953 A1 WO 2006003953A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
Definitions
- the present invention relates to an Fe—Ni alloy pipe, a method for manufacturing the same, and an Fe—Ni alloy seamless pipe manufactured using these pipes. More specifically, it has excellent mechanical properties such as strength and ductility, and an environment containing a lot of corrosive substances such as carbon dioxide, hydrogen sulfide, S (sulfur) and chloride ions (hereinafter referred to as “sour gas environment”). ) Mannesmann Rolling Drilling Machine (hereinafter referred to as “Rolling Pipe”), which is suitable as a base pipe for oil well pipes and line pipes with excellent corrosion resistance, and as a base pipe for various structural members in nuclear power plants and chemical industry plants. It is also referred to as “Piercer.”
- the present invention relates to a Fe—Ni alloy element pipe pierced and rolled by) and a manufacturing method thereof, and a Fe—Ni alloy seamless pipe manufactured using the element pipe.
- Patent Document 4 states that, in an alloy containing 20 to 35% and 25 to 50% by weight of Cr and Ni, respectively, "Moisture content is reduced and economic efficiency is improved by reducing Mo content.” High Cr-High Ni alloy with excellent properties is disclosed.
- Patent Document 5 aims to provide a method for manufacturing a seamless pipe that does not cause a pipe inner surface defect due to overheat when a seamless pipe is manufactured by a piercer.
- the “piercing method for seamless pipe piercing of difficult-to-process materials” is disclosed.
- Non-Patent Document 1 when a high Cr—high Ni alloy is pierced and rolled, the roll crossing angle and the roll inclination angle are increased, and rolling is performed without causing cracks on the inner surface. A possible technique is disclosed.
- Patent Document 1 US Pat. No. 4,168,188
- Patent Document 2 US Pat. No. 4,245,698
- Patent Document 3 WO03Z044239
- Patent Document 4 Japanese Patent Laid-Open No. 11-302801
- Patent Document 5 JP 2000-301212 A
- Non-patent document 1 Tomio Yamakawa, Chihiro Hayashi: CAMP-ISIJ Vol.6 (1993) 364
- Patent Document 4 an alloy having a Mo content of 1.5% or less in Patent Document 4, that is, 20 to 20 proposed as a material for oil wells and gas wells Of the “high Cr—high Ni alloys with excellent stress corrosion cracking resistance” containing 35% Cr and 25-50% Ni, alloys with a Mo content of 1.5% or less are hot. It has workability and will not crack even if it is pierced and rolled with a piercer. For this reason, the above alloy Thus, it is possible to manufacture an alloy pipe base with high productivity. Therefore, this alloy can be said to be an oil / gas well material that is extremely economical.
- Mo (%) +0.5 W (%) are also proposed in Patent Documents 1 to 3 where both Cr and Ni contents are high.
- Ni-based alloys and super austenitic stainless alloys that simultaneously contain high amounts of Mo and Z or W such that the “Mo equivalent value” exceeds 1.5% are resistant to corrosion in severe sour gas environments. Although it is excellent in hot workability, it has been difficult to avoid cracks by piercing and rolling with a piercer.
- austenitic stainless steel such as SUS316, SUS321, or SUS347 specified by JIS is used as the material. Even so, the occurrence of double cracks on the inner surface was remarkable. Therefore, it is much more difficult than these austenitic stainless steels, and both the Cr and Ni contents have a high level of Mo and W in excess of 1.5% in terms of Mo equivalent. If the austenitic alloy contained at the same time was pierced and rolled by a conventional method with a piercer, the occurrence of cracks could not be avoided as described above.
- the hot extrusion method is not suitable for manufacturing a large-diameter tube or a long tube.
- the raw pipes manufactured by hot extrusion methods such as the Eugene Sejurune method have increased the productivity of oil and gas, and have produced alloy pipes used in oil wells at low cost !, However, it did not meet the demands of the industrial world.
- the large diameter pipe or the long pipe can be manufactured by hot forging using a horizontal press, for example.
- the Cr and Ni contents are both high and the Mo equivalent value exceeds 1.5%
- alloys that contain Mo and W at the same time have extremely high hot workability. It is a low-strength material and the temperature range for forging is limited to a narrow range. For this reason, it is necessary to repeat heating and forging many times, and productivity and yield are remarkably inferior, so large diameter pipes and long pipes are mass-produced on an industrial scale by the hot forging method. There was also a problem.
- the "difficult to process material" targeted by the piercer drilling method proposed in Patent Document 5 described above has a deformation resistance higher than that of stainless steel. It's only low. For this reason, all of Ni, Mo, and W, which are elements that increase the deformation resistance, have the above-mentioned high Cr-high Ni, and the force is high such that the Mo equivalent value exceeds 1.5%. Austenitic alloys containing a large amount of Mo and W, especially 20% or more of Cr and 30% or more of Ni, and a high amount of Mo equivalent exceeding 1.5% It is not intended for austenitic alloys containing both Mo and W. However, the piercer drilling method adjusts the billet heating temperature in relation to the piercing speed of the piercer so that the temperature inside the billet is less than the overheat temperature. It's only piercing and rolling!
- the overheating temperature targeted by the piercer-piercing method of Patent Document 5 is 1260 to 1310 ° C, and the "overheating temperature" is the temperature at which the material causes grain boundary melting.
- the billet heating temperature is the same as that of conventional carbon even for materials with lower deformation resistance than stainless steel. Compared with rolling of steel, low alloy steel and martensitic stainless steel, the temperature must be at most 1180 ° C, which is low.
- the drilling speed is at most 300 mmZ seconds, and even at the maximum 300 mmZ seconds, it is necessary to slow down to about half or less of the conventional one. Therefore, it takes about 27 seconds, which is twice as long as before.
- the billet heating temperature is related to the piercing speed by the piercer in order to prevent the billet interior from exceeding the over-heat temperature during piercing and rolling.
- the billet heating temperature is increased to about 1180 ° C, as shown in Fig. 5, the drilling speed must be very slow, about 50 mmZ seconds. It is not worthy of mass production on an industrial scale.
- the drilling speed is about 300 mmZ seconds, as mentioned above, it can be manufactured with about half the efficiency of the conventional method, but as shown in FIG. 5, the billet heating temperature is about 1 060 ° C. The temperature must be very low.
- Non-Patent Document 1 specifically, in the drilling of 25Cr-35Ni-3Mo alloy and 30Cr-40Ni-3Mo alloy, the roll crossing angle is 10 ° or more and the roll inclination angle is When drilling 25Cr-50Ni-6Mo alloy, the roll inclination angle is 16 ° or more when the roll crossing angle is 10 °, and when the roll crossing angle is 15 ° By setting the inclination angle to 14 ° or more, any inner surface can be rolled without causing cracks.
- the roll crossing angle is usually 0 to 10 ° and the roll inclination angle is about 7 to 14 °.
- the austenitic system contains 20% or more of Cr and 30% or more of Ni, and further contains a high amount of Mo or W at the same time in a Mo equivalent value exceeding 1.5%.
- the piercing and rolling of large-diameter and long pipes made of FeNi alloys using piercers on an industrial mass production scale has never been done.
- an austenitic system that conventionally contains 20% or more of Cr and 30% or more of Ni, and further contains a high amount of Mo or W at a Mo equivalent value exceeding 1.5% at the same time. None of the Fe Ni alloys were pierced and rolled at the scale of industrial mass production.
- the present inventors have made it difficult to process a high Cr-high Ni-based Fe-Ni alloy, particularly 20% or more of Cr and 30%. Inner surface when piercing and rolling austenitic Fe Ni alloy containing Mo and W at the same time and containing a high amount of Mo and W that exceeds 1.5% in terms of Mo equivalent value. Regarding the occurrence of defects, we examined in detail the ability to change the structure of materials. As a result, the following findings (a) to (d) were obtained.
- the piercing and rolling properties are good, and the occurrence of two-piece cracking when piercing and rolling with a piercer is suppressed.
- the hot deformation resistance of the material changes mainly depending on the contents of Ni, N, Mo and W, and the higher the deformation resistance, the higher the inner surface coating of (2). Leprosy is likely to occur. And the above-mentioned situation of the inner surface covering flaws includes 20% or more of Cr and 30% or more of Ni, and in addition, a high amount of Mo or W such that the Mo equivalent value exceeds 1.5%.
- the austenitic Fe-Ni alloy contained at the same time can be evaluated by the value of P expressed by the following equation (2). When the sr sr value of P is 120 or less, Generation of inner surface fraying is suppressed.
- the composition balance of Ni, N, Cr, Mo, and W mainly affects the formation of the sigma phase when the billet temperature decreases.
- an austenitic Fe-Ni alloy containing 20% or more of Cr and 30% or more of Ni, and further containing a high amount of Mo and W at the same time such that the Mo equivalent value exceeds 1.5%.
- the cracks on the inner surface and the inner and outer surfaces caused by the generation of sigma phase (3) above become prominent when the sigma phase is generated at 1000 ° C.
- the cracks on the inner surface and the covering of the inner and outer surfaces can be evaluated by the value of P expressed by the following equation (3). When the value of P is 0 or more, piercing and rolling with a piercer is performed. The occurrence of cracks on the inner surface and covering on the inner and outer surfaces when performed is suppressed.
- the present inventors include 20% or more of Cr and 30% or more of Ni.
- Various conditions were investigated for piercing and rolling billets of austenitic Fe-Ni alloys containing high amounts of Mo and W at the same time, exceeding 1.5%. As a result, the following findings (e) and (f) were obtained.
- the occurrence of double cracks caused by grain boundary melting can be easily suppressed by increasing the expansion ratio H, which is expressed as the ratio of the outer diameter of the raw tube and the diameter of the billet. Can do.
- P and S represent the content in mass% of P and S in the raw pipe
- H is the ratio of the outer diameter of the raw pipe to the diameter of the material billet. Indicates the expansion ratio.
- the present invention has been made in view of the above contents, and its purpose is to have high mechanical strength such as excellent strength and ductility and excellent corrosion resistance in a sour gas environment.
- Another object of the present invention is to provide an Fe—Ni alloy seamless pipe that is manufactured using the above-described raw pipe and has excellent mechanical properties and corrosion resistance in a sour gas environment.
- the gist of the present invention is the following Fe-Ni alloy pipe shown in (1) to (7), Fe shown in (8) and (9)
- an Fe—Ni alloy element tube characterized by having a chemical composition of 0 or more and piercing and rolling by a Mannesmann rolling piercing machine.
- the element symbol in the formulas (1) to (3) represents the content in mass% of the element.
- Oil well pipes and line noises manufactured using the Fe-Ni alloy base pipe of the present invention as well as various structural members in nuclear power plants and engineering plants have excellent mechanical properties such as strength and ductility. At the same time, it has excellent corrosion resistance under sour gas environment. For this reason, the Fe—Ni alloy pipe of the present invention can be used as a pipe of an oil well pipe and a line pipe, and can be used as a pipe of various structural members in a nuclear power plant and a chemical industry plant. Further, since the Fe—Ni alloy pipe of the present invention is pierced and rolled by a piercer, it is possible to easily manufacture a pipe having a large diameter or a long pipe using this as a raw material. It can fully meet the demands of the industry to develop oil and gas wells with high efficiency and low cost.
- the strength and toughness are reduced.
- the C content exceeds 0.04%, the ductility and toughness deteriorate significantly. Therefore, the C content is set to 0.04% or less. It is more preferable to reduce the C content to 0.02% or less.
- the corrosion resistance is remarkably improved not only by improving ductility and toughness.
- M in the above “MC type carbide” is a composite of metal elements such as Mo, Fe, Cr and W.
- Si 0.50% or less
- Mn has a desulfurization action.
- the Mn content needs to be 0.01% or more.
- the Mn content exceeds 6.0%, the MC type carbide
- the Mn content is set to 0.01 to 6.0%. Note that if the Mn content exceeds 1.0%, the formation of sigma phase is promoted, and even when the value of P represented by the above formula (3) is greater than or equal to ⁇ , the piercing by the piercer Rolling may cause cracks on the inner surface and glazing on the inner and outer surfaces due to sigma phase formation. Therefore, it is more preferable that the Mn content is 0.01-1.0.0%. More preferably, it is 0.5%.
- P is an impurity that is usually inevitably mixed in.
- hot workability deteriorates and corrosion resistance also deteriorates.
- the content of P is set to 0.03% or less.
- the P content is more preferably 0.01% or less.
- s is also an impurity that is usually inevitably mixed in.
- hot workability deteriorates and corrosion resistance also deteriorates.
- the S content is set to 0.01% or less.
- the S content is more preferably 0.005% or less.
- Cr together with Mo, W and N, has the effect of improving the corrosion resistance and strength of the alloy.
- the above-mentioned effect is remarkably obtained when the Cr content is 20% or more.
- the Cr content is 20-30%.
- the Cr content is more preferably 21 to 27%.
- the Cr content is Ni, Mo, W and N described later. It is necessary to make the amount satisfying the value power of P represented by the above equation (3) in balance with the content of [0066] Ni: 30-45%
- Ni has an action to stabilize the austenite base together with N, and is an essential element for containing a large amount of elements having strengthening and corrosion resistance such as Cr, Mo and W in the Fe-Ni alloy. is there. Ni also has the effect of suppressing sigma phase formation.
- Each of the above-described actions can be reliably obtained when the Ni content is 30% or more.
- a large amount of Ni added lead to an excessive increase in the alloy cost. In particular, when the Ni content exceeds 45%, the cost increases greatly. Therefore, the Ni content was 30-45%.
- the Ni content is more preferably 32 to 42%.
- the content of Ni is the content of Mo, W and N described later. In balance with the amount, it is necessary that the value of P expressed by the above equation (2) satisfies 120 or less. Also, sigma phase sr
- the Ni content is in balance with the Cr content described above and the Mo, W and N content described below. It is necessary to make the amount satisfying the value power of P represented by the formula (3) or more.
- Mo 0 to 10%
- W 0 to 20%
- Mo (%) + 0.5 W (%) which is the value expressed by the formula, that is, Mo equivalent, contains Mo and Z or W in an amount exceeding 1.5%. It is necessary to let However, if the Mo equivalent value exceeds 10%, mechanical properties such as ductility and toughness will be reduced. Mo and W do not need to be added together as long as the Mo equivalent value is in the above range. Therefore, the Mo content is set to 0 to 10%, the W content is set to 0 to 20%, and the value of Mo (%) + 0.5W (%) exceeds 1.5% to 10% or less. did.
- the contents of Mo and W, and the value of Mo equivalent are the above-described Ni and the below-mentioned in order to suppress an excessive increase in deformation resistance and to prevent the occurrence of inner surface glazing.
- Cu is an element effective for improving the corrosion resistance in a sour gas environment.
- S sulfur
- Cr molybdenum
- Mo molybdenum
- W molybdenum
- the above effect is obtained when the Cu content is 0.01% or more.
- the Cu content was set to 0.01 to: L 5%.
- the Cu content is more preferably 0.5 to 1.0%.
- A1 0. 10% or less
- A1 is the most harmful element that promotes the formation of sigma phase.
- the content of A1 is set to not more than 0.10%.
- the content of A1 is more preferably 0.06% or less.
- N 0.0005 to 0.20%
- N is one of the important elements in the present invention, and has an effect of stabilizing the austenite base together with Ni and an effect of suppressing the formation of the sigma phase.
- the above effect can be obtained when the N content is 0.0005% or more.
- a large amount of N added force may cause a decrease in toughness.
- the toughness may be significantly decreased. Therefore, the N content was set to 0.0005 to 0.20.
- the N content is more preferably 0.0005 to 0.12%.
- the content of N is the content of Ni, Mo and W described above. In balance with the amount, it is necessary that the value of P expressed by the above equation (2) satisfies 120 or less. Also, sigma phase sr
- Fe has the effect of securing the strength of the alloy and reducing the alloy cost by reducing the Ni content. For this reason, in the alloy used as the material of the Fe—Ni alloy pipe according to the present invention, the substantial remaining element is Fe.
- T was set to 1300 or more.
- GBm GB value is more preferably 1320 or more.
- the value of P was set to 120 or less.
- the value of P is more preferably 90 or less.
- High Cr—High Ni-based Fe—Ni alloys especially containing 20% or more of Cr and 30% or more of Ni, and high amounts of Mo and W exceeding 1.5% in terms of Mo equivalent
- the value of P expressed by equation (3).
- the value of P was set to 0 or more. It is more preferable that the value of P is 3.0 or more.
- the chemical composition of the alloy that is the material of the Fe-Ni alloy pipe according to the present invention (1) includes an element up to the C force N in the above-mentioned range, and the balance is substantially made of Fe.
- the value of T is 1300 or more, the value of P is 120 or less, and the value of P is ⁇ ) or more.
- the Fe—Ni alloy pipe according to the present invention (2) has an Mn content of 0.01% among the chemical composition of the alloy used as the material of the Fe—Ni alloy pipe according to the present invention (1). It is specified as ⁇ 1.0%.
- the alloy used as the material of the Fe-Ni alloy pipe according to the present invention has the above-mentioned components, and if necessary,
- V 0.001 to 0.3%
- Nb 0.001 to 0.3%
- Ta 0.001 to 1.0%
- Ti 0.001 to 1.0%
- Zr 0.001 to 1.0%
- Hf 0.001 to 1.0% more than
- Mg 0.0001 to 0.010%, Ca: 0.0001 to 0.010%, La: 0.0001 to 0.20%, Ce: 0.0001 to 0.20%, Y: 0.0001 to 0.40%, Sm: 0.0001 to 0.40%, Pr: 0.0001 to 0.40 %
- Nd 0.0001 to 0.50% selected from one or more elements, and one or more elements of each group can be selectively contained. That is, one or more elements of the four groups (i) to Gv) may be added as optional additional elements.
- V 0.001 to 0.3%
- Nb 0.001 to 0.3%
- Ta 0.001 to 1.0%
- Ti 0.001 to 1.0%
- Zr 0.001 to 1.0%
- Hf 0.001 to 1.0%
- V, Nb, Ta, Ti, Zr and Hf all have the effect of significantly increasing the corrosion resistance in a sour gas environment where S (sulfur) is recognized as a single substance.
- MC type carbide (however, M means any one of V, Nb, Ta, Ti, Zr and Hf, or composite). And has the effect of stabilizing c, and also has the effect of increasing strength.
- any element of V, Nb, Ta, Ti, Zr and Hf is 0.0.
- a content of 01% or more is preferable.
- V and Nb exceed 0.3%
- Ta
- the content of each of the case of adding V, Nb, Ta, Ti, Zr and Hf are, V I or from 0.001 to 0.3 0/0, Nbi or from 0.001 to 0.3 0/0, Tai or 0. 001 ⁇ 1. O 0/0, Tii or 0. 001
- Nb 0.001 to 0.3%
- Ta 0.001 to 1.0%
- Ti 0.001 to 1.0%
- V, Nb, Ta, Ti, Zr and Hf can be!, Added by one type of displacement force or a combination of two or more types.
- B When added, B has the effect of refining the precipitate and the austenite crystal grain size. In order to reliably obtain the above-described effect, it is preferable that B has a content of 0.0001% or more. However, when a large amount of B is added, a low melting point compound may be formed and the hot workability may be deteriorated. In particular, when the content exceeds 0.015%, the hot workability is significantly deteriorated. There is. Therefore, when B is added, the B content is preferably 0.0001-0.015%.
- the more preferable range of the B content when added is 0.0001 to 0.0050%.
- Co when added, has the effect of stabilizing austenite.
- the Co content is 0.3% or more.
- Co-enriched calories lead to an excessive increase in alloy costs, especially when the Co content exceeds 5.0%. Therefore, the content of Co when added is preferably 0.3 to 5.0.
- the more preferable range of the Co content when added is 0.35 to 4.0%.
- Mg, Ca, La, Ce, Y, Sm, Pr, and Nd all have the effect of preventing solidification cracking during ingot fabrication. It also has the effect of reducing ductility deterioration after long-term use.
- Mg, Ca, La, Ce, Y, Sm, Pr, and Nd are also 0.0001% or more.
- Mg and Ca exceed 0.010%
- La and Ce exceed 0.20%
- Y, Sm and Pr exceed 0.40%
- Nd exceed 0.50%
- coarse inclusions are formed and the toughness is reduced.
- each content when adding Mg, Ca, La, Ce, Y, Sm, Pr, and Nd [Ma, Mgi 0.001 to 0.001%, Cai 0.001 ⁇ 0.010%, Lai 0.0001 ⁇ 0.20%, Ce is 0.0001 ⁇ 0.20%, Y is 0.0001 ⁇ 0.40%, Sm is 0.0001 ⁇ The force is 0.40%, Pr is 0.0001 to 0.40%, and Nd is 0.0001 to 0.50%.
- the Fe— in any of the present invention (1) to the present invention (5) instead of Fe in Ni alloy, Mg: 0.0001 to 0.001%, Ca: 0.0001 to 0.010%, La: 0.001 to 0.20%, Ce: 0.0001 ⁇ 0.20%, Y: 0.0001 ⁇ 0.40%, Sm: 0.0001 ⁇ 0.40%, Pr: 0.0001 ⁇ 0.40% and Nd: 0.0001 ⁇ 0.50% It is specified that it contains one or more selected.
- the more preferable range of the content of soot [Mg force ⁇ 0.0010 to 0.00. 0050%, Ca force ⁇ 0. 0010 ⁇ 0. 0050 0/ 0, La force 0. 01 ⁇ 0. 15 0/0, Ce force 0. 01 ⁇ 0. 15 0/0, Y force from 0.01 to 0 . 15%, Sm force SO. 02-0. 30%, Pr force from 0.02 to 0.30 0/0 and Nd force from 0.01 to 0. 30 0/0.
- the Fe-Ni alloy having the chemical composition described in the above section (A) optimizes the content of elements from C to N, and in particular, at the high temperature during piercing and rolling by a piercer. Correlate with the occurrence of double cracks due to grain boundary melting at the side, internal cracks due to high deformation resistance, and internal cracks due to sigma phase formation and internal and external cracks.
- T expressed by the above-mentioned equation (1)
- the value of P expressed by the above-mentioned equation (2) the above-mentioned equation (3)
- the values of P represented by are set to 1300 or more, 120 or less, and 0 or more, respectively. For this reason, even if the Fe-Ni alloy billet having the chemical composition described in the above section (A) is pierced and rolled with a piercer in the usual manner, It is possible to suppress all occurrences of cracks on the inner surface and inner and outer surfaces caused by sigma phase formation, and therefore, an elementary tube with good surface properties can be obtained.
- the present invention (8) has a large diameter produced by mass-producing a billet of Fe-Ni alloy having the chemical composition described in the above section (A) by piercing and rolling with a piercer. ! / In response to the industry's request to obtain tubes and long tubes.
- the Fe—Ni alloy pipe according to the present invention (1) to the present invention (6) has the chemical composition described in the above section (A) and is pierced and rolled by a piercer. Stipulated.
- the pipe manufactured by the method of the present invention (8) that is, the pipe obtained by piercing and rolling the billet having the chemical composition described in the above section (A) with a piercer, is as described above.
- it is a tube with good surface properties in which the occurrence of double cracks, inner surface cracks, and cracks on the inner surface and inner and outer surfaces due to sigma phase formation are all suppressed.
- this invention (1)-book
- the Fe Ni alloy pipe according to the invention (6) can sufficiently meet the demands of the industry.
- the piercing and rolling by the billet piercer which is also the chemical yarn and the synthetic yarn described in the above section (A) may be performed by a usual method.
- the piercing and rolling by the piercer is performed under the same conditions as in the case of martensitic stainless steel such as carbon steel, low alloy steel, and so-called "13% Cr steel".
- the billet caro heat temperature is 1200-1300
- the roll crossing angle is 0-10 °
- the roll tilt angle is 7-14
- the draft rate is 8-14%
- the plug tip draft rate is 4-7.
- piercing and rolling may be performed.
- the draft rate and the plug tip draft rate are expressed by the following formulas (5) and (6), respectively.
- Draft rate (%) ⁇ (Material diameter—roll gorge spacing) Z material diameter ⁇ X 100 (5)
- Plug tip draft rate (%) ⁇ (Material diameter Roll spacing at the tip of plug) Z Material Diameter ⁇ X 100 (6).
- the piercing and rolling by the billet piercer which is also the elastic yarn and the synthetic yarn described in the above section (A) has special conditions that can be performed by a normal method. There is no need.
- the tube expansion ratio H expressed by the ratio of the outer diameter of the raw tube and the diameter of the material billet the occurrence of double cracks due to grain boundary melting can be easily suppressed. If the fn value expressed by the above equation (4) is 1 or less, the occurrence of double cracking due to grain boundary melting during piercing and rolling using a piercer is completely achieved. Can be prevented.
- the present invention (9) is the fn represented by the above formula (4) when the Fe Ni alloy billet having the chemical composition described in the above section (A) is pierced and rolled by a piercer.
- the value of 1 was set to 1 or less for piercing and rolling.
- the present invention (7) such an Fe—Ni alloy pipe has the chemical composition described in the above section (A) and the fn value represented by the above formula (4) ⁇ It was defined that the force was pierced and rolled by Piercer.
- the pipe expansion ratio H at the time of piercer piercing rolling can easily suppress the occurrence of double cracking due to grain boundary melting by increasing the value. But its value Exceeding the force ⁇ causes the bulge of the tube to become too large, and the material tends to squeeze into the gap between the roll and the disk or guide shroud, which is the outer surface regulating tool. .
- the upper limit value of the tube expansion ratio H is preferably 2.
- the lower limit value of the expansion ratio H is less than 1, the outer diameter of the obtained raw pipe is smaller than the diameter of the material billet, so the outer diameter of the plug or the core metal which is the inner surface tool is also reduced. It is necessary to reduce the size of the plug, which may cause the plug to melt or bend the core due to insufficient heat capacity.
- the Fe-Ni alloy seamless pipes manufactured using this material have good surface properties and excellent strength in terms of mechanical properties and corrosion resistance in sour gas environments. For this reason, it is suitable as various structural members in oil well pipes and line pipes, nuclear power generation plants, and engineering industries plants.
- the present invention (10) is the Fe-Ni alloy pipe according to any of the present invention (1) to the present invention (7), or the present invention (8) or the present invention (9). It was defined as an Fe-Ni alloy seamless pipe manufactured using the Fe-Ni alloy base pipe manufactured by the method.
- a drawing machine such as a mandrel mill, plug mill, assel mill, push bench, etc.
- the desired Fe-Ni alloy seamless pipe can be easily finished.
- Alloys 1 to 23 are alloys of the present invention examples whose chemical compositions are within the range specified by the present invention.
- Alloys a to (! Are comparative alloys in which any of the components is out of the range of the content defined in the present invention.
- alloy a and alloy b are conventional alloys. It is almost equivalent to ASM UNS No.08028 and No.08535.
- each of the above ingots was soaked at 1200 ° C for 2 hours, and then hot forged by a normal method to change the tube expansion ratio during piercing and rolling.
- One 5 mm billet, two 70 mm diameter billets, and a 55 mm diameter billet One piece was made.
- the forging finishing temperature was 1000 ° C or higher.
- the expansion rate H was set to 1.09-: L 74, and the raw pipes of the sizes shown in Table 3 were used. It was pierced and rolled.
- Table 3 shows the relationship between the tube expansion rate, billet size, and tube size.
- Table 4 shows the roll crossing angle, roll inclination angle, draft rate, and plug leading edge draft rate, which are the drilling conditions of the model mill, which is a drilling device.
- Table 6 summarizes the survey results for cracks and flaws.
- ⁇ ”, “ ⁇ ”, “ ⁇ ”, and “X” indicate that “there were strong cracks and creases”, “there were no cracks but there were small creases”, and “cracks” It means “there was a large flaw” but “there was a crack”.
- alloys 1 to 23 alloy P and alloy q, where the investigation result of cracks and flaws in the above-mentioned raw pipe includes the evaluation of “ ⁇ ”, the pipe expansion ratio H is 1.36 and is represented as it is.
- solution heat treatment was performed by holding at 1050 ° C. for 30 minutes and then cooling with water.
- a strip-shaped material having a thickness of 5 mm, a width of 12 mm, and a length of 150 mm was cut out and cold-rolled by a normal method to form a 3.5-mm-thick plate, and the tensile properties and corrosion resistance were investigated using this as a material.
- a four-point bending corrosion test piece having a notch with a radius of 0.25 mm and a width of 10 mm, a thickness of 2 mm, and a length of 75 mm was prepared from the above-mentioned 3.5 mm thick plate.
- Corrosion resistance that is, stress corrosion cracking resistance was evaluated under the sour gas environment.
- Test solution 20% NaCl—0.5% CH 2 COOH,
- Test gas Hydrogen sulfide partial pressure 1013250Pa—CO2 partial pressure 2026500Pa (10atmH S
- Table 6 shows the results of the tensile test and the corrosion resistance test.
- ⁇ O '' and ⁇ X '' in the column of corrosion resistance indicate that cracking occurred and that cracking occurred. means.
- “-” in the column of tensile properties and corrosion resistance of alloys a to o indicates that there is no “ ⁇ ” in the evaluation of cracks and wrinkles of the pierced and rolled raw pipes, and that the test was! / ⁇ . Show.
- the billet was heated to 1230 ° C, and then piped on an actual machine under the conditions shown in Table 8 to obtain a blank having an outer diameter of 235 mm and a wall thickness of 15 mm.
- the value of fn expressed by the above equation (4) is 0.193856.
- the piercer brag is suitable for piercing and rolling of Fe-Ni alloys.
- the tensile strength at 900 ° C is 90 MPa, the total scale thickness before use is 600 / zm, and 0.5% Cr-l.
- a material made of 0% Ni—3.0% W series material was used.
- each of the five elementary tubes was subjected to cold drawing with a cross-sectional reduction rate of 30%, followed by a solution heat treatment that was heated to 10 90 ° C and cooled with water, and then further reduced in cross-sectional reduction rate. 30% cold drawing was applied.
- Test solution 20% NaCl—0.5% CH 2 COOH,
- Test gas Hydrogen sulfide partial pressure 1013250Pa—CO2 partial pressure 2026500Pa (10atmH S
- Table 9 summarizes the tensile test results and the corrosion resistance test results.
- “ ⁇ ” in the column of corrosion resistance means that cracking did not occur.
- the Fe-Ni alloy pipe of the present invention Since the Fe-Ni alloy pipe of the present invention has excellent inner surface properties, the pipe is used in a normal manner. Therefore, for example, after expanding the tube with a drawing machine such as a mandrel mill, plug mill, assel mill, push bench, etc. It can be finished into a seamless tube. Since the seamless pipe has excellent mechanical properties and excellent corrosion resistance in a sour gas environment, the Fe—Ni alloy base pipe of the present invention is an oil well pipe and a line pipe base pipe, It can be used as a raw material pipe for various structural members in nuclear power plants and engineering plants. This Fe—Ni alloy tube can be easily mass-produced at low cost by the method of the present invention.
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- Thermal Sciences (AREA)
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2572156A CA2572156C (en) | 2004-06-30 | 2005-06-29 | Fe-ni alloy pipe stock and method for manufacturing the same |
EP05755195.4A EP1777314B9 (en) | 2004-06-30 | 2005-06-29 | RAW PIPE OF Fe-Ni ALLOY AND METHOD FOR PRODUCTION THEREOF |
AU2005258506A AU2005258506B2 (en) | 2004-06-30 | 2005-06-29 | Raw pipe of Fe-Ni alloy and method for production thereof |
EP13186005.8A EP2682494B1 (en) | 2004-06-30 | 2005-06-29 | Method for manufacturing an Fe-Ni alloy pipe stock |
JP2006528763A JP4513807B2 (ja) | 2004-06-30 | 2005-06-29 | Fe−Ni合金素管及びその製造方法 |
US11/643,823 US8784581B2 (en) | 2004-06-30 | 2006-12-22 | Fe-Ni alloy pipe stock and method for manufacturing the same |
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JP2004-194351 | 2004-06-30 | ||
JP2004194351 | 2004-06-30 |
Related Child Applications (1)
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US11/643,823 Continuation US8784581B2 (en) | 2004-06-30 | 2006-12-22 | Fe-Ni alloy pipe stock and method for manufacturing the same |
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WO2006003953A1 true WO2006003953A1 (ja) | 2006-01-12 |
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PCT/JP2005/011992 WO2006003953A1 (ja) | 2004-06-30 | 2005-06-29 | Fe-Ni合金素管及びその製造方法 |
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US (1) | US8784581B2 (ja) |
EP (2) | EP1777314B9 (ja) |
JP (1) | JP4513807B2 (ja) |
CN (1) | CN100554475C (ja) |
AU (1) | AU2005258506B2 (ja) |
CA (1) | CA2572156C (ja) |
WO (1) | WO2006003953A1 (ja) |
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US10174397B2 (en) | 2014-02-13 | 2019-01-08 | Vdm Metals International Gmbh | Titanium-free alloy |
JP2019035122A (ja) * | 2017-08-17 | 2019-03-07 | 日本冶金工業株式会社 | Fe−Ni−Cr−Mo合金およびその製造方法 |
WO2024009594A1 (ja) * | 2022-07-07 | 2024-01-11 | 日立Geニュークリア・エナジー株式会社 | ニッケル基合金 |
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CA2572156C (en) | 2013-10-29 |
CN100554475C (zh) | 2009-10-28 |
AU2005258506A1 (en) | 2006-01-12 |
CN1977060A (zh) | 2007-06-06 |
EP2682494A2 (en) | 2014-01-08 |
US20070175547A1 (en) | 2007-08-02 |
EP2682494A3 (en) | 2018-02-21 |
EP1777314B9 (en) | 2016-05-18 |
EP1777314A4 (en) | 2008-01-09 |
JP4513807B2 (ja) | 2010-07-28 |
EP1777314B1 (en) | 2016-02-03 |
EP2682494B1 (en) | 2019-11-06 |
CA2572156A1 (en) | 2006-01-12 |
US8784581B2 (en) | 2014-07-22 |
JPWO2006003953A1 (ja) | 2008-04-17 |
AU2005258506B2 (en) | 2008-11-20 |
EP1777314A1 (en) | 2007-04-25 |
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