CN104962836A - Corrosion-resistance iron-based austenite oil well pipe and manufacturing method thereof - Google Patents
Corrosion-resistance iron-based austenite oil well pipe and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a corrosion-resistance iron-based austenite oil well pipe and a manufacturing method thereof. The main chemical components of the oil well pipe include C larger than 0 and smaller than or equal to 0.03%, Si larger than 0 and smaller than or equal to 1.00%, Mn larger than 0 and smaller than or equal to 2.50%, P smaller than or equal to 0.03%, S smaller than or equal to 0.03%, 20.0%-28.0% of Cr, 20.0%-38.0% of Ni, 3.0%-5.0% of Mo and 0.50%-2.00% of Cu. The manufacturing method includes the first step of smelting; the second step of billet pouring; the third step of electroslag remelting; the fourth step of homogenizing annealing; the fifth step of billet forging; the sixth step of pipe billet preparing; the seventhly step of hot extruding, wherein a seamless steel pipe is formed through pipe billet preheating, power frequency induction furnace heating, pipe billet broaching, secondary induction heating and extruding; the eighth step of solid solution treating; and the ninth step of conducting of a deformation strengthening mode in cold drawing, wherein the percentage reduction of area is controlled within 20-40%, and the oil well pipe is manufactured. According to the corrosion-resistance iron-based austenite oil well pipe and the manufacturing method thereof, the wall thickness of the manufactured oil well pipe ranges from 15 mm to 40 mm, the yield strength is 760 MPa or higher, the tensile strength is 793 MPa or higher, the impact energy is 100 J or higher, the corrosion resistance is good, and the requirement for strictest and slow-strain tests is met.
Description
Technical field
The present invention relates to a kind of iron-based austenite oil well pipe and manufacture method thereof, relate generally to a kind of high strength, corrosion resistant iron-based austenite weldless steel tube and manufacture method thereof.
Background technology
Increasingly severe with oil-gas mining environment, " three is high " (high temperature, high pressure, high corrosion) Oil/gas Well also increases gradually, and the Oil/gas Well degree of depth in Some Domestic area is more than 7000 meters, and the temperature of down-hole, more than 150 DEG C, exists the H of high density simultaneously
2s and CO
2gas, and H
2the dividing potential drop of S gas reaches more than 8MPa.For this kind of conditions down-hole, iron-based, abros must be adopted to meet service requirements.
Iron-based austenite corrosion-resistant alloy be organized as austenite, and adding due to non-corrosive metal element, broaden between austenitic area, under normal temperature and the condition of high temperature, without obvious phase transition process in hot and cold processing and heat treatment process, therefore cannot be strengthened by phase transformation, only have and reach by other schedule of reinforcement the object promoting intensity.
Conventional schedule of reinforcement has two kinds: alloy strengthening and deformation strengthening.
Alloy strengthening is when not affecting alloying constituent system, adds or raising part does not affect the element of alloy property, the elements such as such as C, N.These elements exist between the gap of austenite lattice, hinder the deformation process of alloy, reach enhancement purpose.
The major way of deformation strengthening is cold work reinforced.For alloy pipe, cold rolling, cold-drawn, aligning are three kinds of modes of strengthening.By distortion, tubing inside forms a large amount of dislocation group, hinders sliding deformation, reaches enhancement purpose.
Under normal circumstances, in view of the interpolation difficulty of alloying element is large, affect final tissue morphology, deformation strengthening is the main schedule of reinforcement of Fe base non-corrosive metal pipe.
For oil well pipe, usually require that yield strength is at more than 760MPa, tensile strength at more than 793MPa, unit elongation usually more than 11%, the stress corrosion (SCC) of anti-acid environment and the H 2 S stress corrosion (SSC) of high density.
But the specification of oil well pipe is many, for the Fe base non-corrosive metal oil well pipe (wall thickness is generally at more than 15mm) that wall thickness is larger, conventional cold-work strengthening cannot meet the requirement (surface deformation of strengthening, heart portion is indeformable), if strengthen cold deformation, cannot industrial production be realized again.Therefore.The non-corrosive metal pipe of large gauge, high strength is a production difficult problem for steel pipe circle all the time.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing corrosion resistant iron base austenite oil well pipe, the invention provides a kind of corrosion resistant iron base austenite oil well pipe, the wall thickness of this corrosion resistant iron base austenite oil well pipe is at 15mm ~ 40mm, yield strength is at more than 760MPa, more than tensile strength 793MPa, unit elongation more than 20%, more than ballistic work 100J, in the NaCl solution of concentration 37%, the CO2 stress corrosion (SCC) of H2S and 1.1MPa of resistance to 0.6MPa and H 2 S stress corrosion (SSC), and meet the strictest slow strain-gauge test requirement (SSRT).
Another object of the present invention is to provide a kind of manufacture method of this oil well pipe.
The chemical composition (weight percent) of this corrosion resistant iron base austenite oil well pipe is:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%，
All the other are iron and its impurity element of trace.
Above-mentioned corrosion resistant iron base austenite oil well pipe, it is characterized in that the content also containing N, N is 0.05% ~ 0.30%, namely its chemical composition percentage ratio (weight) is:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%， N 0.05%～0.30%，
All the other are iron and its impurity element of trace.
The wall thickness of corrosion resistant iron base austenite oil well pipe of the present invention is at 15mm ~ 40mm; And intensity is high, through hot extrusion, solid solution and cold-drawn, yield strength at more than 760MPa, more than tensile strength 793MPa, unit elongation more than 20%, more than ballistic work 100J.
Corrosion resistant iron base austenite oil well pipe of the present invention has good erosion resistance, it is in the NaCl solution of concentration 37%, the CO2 stress corrosion (SCC) of H2S and 1.1MPa of resistance to 0.6MPa and H 2 S stress corrosion (SSC), meet the strictest slow strain-gauge test and require (SSRT).
The key step of the manufacture method of this oil well pipe is as follows:
Preprocessed molten iron → converter or electric furnace → AOD or VOD → continuous casting or die casting → esr → homogenizing anneal → cogging → rolling or forging → pipe prepare (boring, chamfering) → hot extrusion → solid solution → cold-drawn (rolling) → aligning → crop → detect a flaw → weigh → spray and mark → pack.
The manufacture method of this corrosion resistant iron base austenite oil well pipe comprises following step successively:
i, smelt
Pretreated molten iron is after converter or electrosmelting and AOD or VOD refining, and ladle chemistry percentage ratio (weight) reaches following requirement and can tap:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%，
All the other are iron and its impurity element of trace.
iI, cast steel billet
By above-mentioned continuous casting of molten steel or be molded into steel billet.
iII, esr
Adopt argon shield electroslag remelting furnace and ingot shape, after remelting, in 2min, enter water cooling.
iV, homogenizing anneal
Annealing temperature controls at 1150 ~ 1250 DEG C, annealing time 20 ~ 40h.
v, blank forging
A heats
By heating steel billet, soaking temperature is 1100-1200 DEG C, and heat-up time, according to steel billet THICKNESS CALCULATION, gets 1-2min/mm, and soaking time is 30-60min, guarantees that steel billet is grilled thoroughly, evenly.
B rolling or forging solid pipe billet
When rolling or forging solid pipe billet, open rolling or the temperature opening forging are 1100 ~ 1200 DEG C, and minimum finish to gauge or final forging temperature are 1000-1060 DEG C.Forge in rear 2min and entered water cooling.
vI, pipe prepare
Pipe prepares to comprise sawing, gun drilling, chamfering three operations.Sawing carries out cutting according to the dimensional requirement of steel pipe; Gun drilling be by cutting after pipe carry out centre-drilling hole, aperture is generally 40-100mm; Chamfering be by boring after pipe carry out two ends chamfered edge, avoid sharp-pointed rib portion to affect subsequent production.
vII, hot extrusion
The preheating of advanced line pipe base, usual preheating temperature is 600-1000 DEG C, and warm up time is pipe diameter × (1-2) min.
Enter line frequency induction furnace heating after preheating, the temperature of heating is 1100-1150 DEG C, and soaking time is 1-5min, and after induction heating, temperature head is within 20 DEG C.
Then pipe carries out reaming, and the size of reaming is fixed with the size of fished pipe, carries out glass powder lubrication before reaming at pipe surfaces externally and internally;
Carry out line-frequency induction heating again after reaming, Heating temperature comparatively reaming temperature wants high, and for hot extrusion is prepared, the temperature of secondary induction heating is between 1150-1200 DEG C;
Secondary induction heating is complete, pipe is delivered in extrusion machine container after carrying out surfaces externally and internally glass powder lubrication and is extruded, choose the tool and mould (comprising squeezing needle, overflow mould, pressure pad etc.) adapted with final dimension, extrusion speed is generally 100-300mm/s, is crushed to weldless steel tube; Extrude complete air cooling to room temperature.
vIII, solid solution
The temperature of solid solution is 1150 ~ 1200 DEG C, and soaking time is determined according to thickness of steel pipe, is generally wall thickness × (2-3) minute, Putting into water rapidly cooling in 30 seconds after solid solution.The object of solid solution is the intermetallic phase that elimination alloying element causes, and avoids affecting follow-up severe rugged environment and is on active service.
Ⅸ, cold-drawn (rolling)
This corrosion resistant iron base austenite oil well pipe, the high strength gap of the intensity after solid solution and requirement is larger.For ensureing high strength, must carry out cold work reinforced
,the cold work reinforced major way being austenitic steel and strengthening.For alloy pipe, cold rolling, cold-drawn, aligning are three kinds of modes of strengthening.By distortion, tubing inside forms a large amount of dislocation group, hinders sliding deformation, reaches enhancement purpose.
The cooled weldless steel tube of solid solution, carry out cold rolling, cold-drawn, the minimum a kind of deformation strengthening mode of aligning, control section shrinking percentage, 20 ~ 40%, makes oil well pipe.
Ⅹaligning and crop
After cold working is complete, perform finishing procedure.Aligning ensures steel pipe linearity, and crop ensures that steel pipe section gradient meets standard-required.Standard performs ISO 13680-2010 " oil and natural gas industrial non-corrosive metal oil well pipe technical qualification ".
Ⅺflaw detection, spray mark, packaging
Flaw detection, spray mark, packaging can be delivered.
The manufacture method of above-mentioned corrosion resistant iron base austenite oil well pipe, what it is characterized in that it manufactures is the steel pipe of wall thickness 15-40mm.
The manufacture method of above-mentioned corrosion resistant iron base austenite oil well pipe, its steps characteristic is: in step
iin smelting, the content smelted also containing N, N in the molten steel composition is 0.05% ~ 0.30%, and namely its chemical composition percentage ratio (weight) is:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%， N 0.05%～0.30%，
All the other are iron and its impurity element of trace.
Advantage of the present invention is as follows:
(1) by cold-drawn (rolling) mode, cold-work strengthening is carried out to steel pipe, the relative reduction in area of cold-drawn (rolling) controls 20 ~ 40%, can be made into yield strength at more than 760MPa, tensile strength is at more than 793MPa, unit elongation more than 20%, the height strengthening non-corrosive metal seamless tube of more than ballistic work 100J.And steel pipe meets in the NaCl solution of concentration 37%, the CO2 stress corrosion (SCC) of H2S and 1.1MPa of resistance to 0.6MPa and H 2 S stress corrosion (SSC), can also meet the strictest slow strain-gauge test requirement (SSRT).
(2) this section shrinkage is mainly applicable to the weldless steel tube of wall thickness at more than 15mm.For the weldless steel tube of more than wall thickness 15mm, when strengthening without N element, cold work reinforced relative reduction in area must reach 40 ~ 80% and could realize strengthening requirement, therefore this patent novelty adds the mode that appropriate N element carries out strengthening, relative reduction in area controls 20 ~ 40%, both ensure that industrial smooth realization, meet again the requirement of high strength.
By method of the present invention, thickness 40mm can be produced, yield strength at more than 760MPa, more than tensile strength 793MPa, unit elongation more than 20%, the Fe based austenite non-corrosive metal weldless steel tube of more than ballistic work 100J.
Specific embodiment
The embodiment of Fe based austenite non-corrosive metal seamless tube and manufacture method thereof is described in detail below in conjunction with embodiment.
based austenite non-corrosive metal pipe embodiment 1
The present embodiment mass percent is:
C 0.011， Si 0.25， Mn 0.56， P 0.022， S 0.001，
Cr 26.55, Ni 30.27, Mo 3.83, Cu 0.81, N 0.08, all the other are iron and its impurity element of trace.
This enforcement specification is Φ 192 × 18 × 6000mm, and the detected result after cold working is, surrender 820MPa, tension 855MPa, unit elongation 30%, ballistic work 150-200J.
manufacture method embodiment 1
One, smelt
Pretreated molten iron is after electric furnace+AOD furnace refining, and the Ingredient percent of molten steel reaches following requirement and can tap:
C 0.011， Si 0.25， Mn 0.56， P 0.022， S 0.001，
Cr 26.55， Ni 30.27， Mo 3.83， Cu 0.81， N 0.08，
All the other are iron and its impurity element of trace.
Two, steel billet is poured into a mould
Adopt the ingot mould of 9 tons, above-mentioned pouring molten steel is become the electrode blank of Φ 800mm.
Three, esr
Adopt argon shield esr mode, ingot shape is Φ 500mm.Water cooling time 50s is entered after remelting.
Four, homogenizing anneal
Annealing temperature controls at 1200 ~ 1220 DEG C, annealing time 25h.
Five, blank forging
A heats
By heating steel billet, soaking temperature is 1180 DEG C, heat-up time 600min, soaking time is 60min, guarantees that steel billet is grilled thoroughly, evenly.
B forges solid pipe billet
During forging solid pipe billet, the temperature opening forging is 1160 DEG C, and most final forging temperature is 1030 DEG C.Enter water time 58s after having forged, forging is of a size of Φ 400mm.
Six, pipe prepares
Pipe prepares to comprise sawing, gun drilling, chamfering three operations.Sawing length 600mm/ props up; Gun drilling aperture 60mm; Chamfer dimesion R25.
Seven, hot extrusion
Preheating temperature is 950 DEG C, and warm up time is 400min, guarantees that preheating is even.Enter line frequency induction furnace heating after preheating, the temperature of heating is 1123 DEG C, and soaking time is 1.5min.Induction heating is complete, and pipe is delivered to staving press and carried out reaming, and rose bit is of a size of Φ 200mm, carries out glass powder lubrication before reaming at pipe surfaces externally and internally; Carry out line-frequency induction heating again after reaming, the temperature of secondary induction heating is 1183 DEG C; Secondary induction heating is complete, pipe is delivered in extrusion machine container after carrying out surfaces externally and internally glass powder lubrication and is extruded, and overflow mould is of a size of Φ 219mm, and squeezing needle is of a size of Φ 191mm, extrusion speed 150mm/s, extrudes the complete weldless steel tube obtaining Φ 219 × 14mm.
Eight, solid solution
The temperature of solid solution is 1183 DEG C, and soaking time 30 minutes, is quickly cooled to room temperature after solid solution.
Nine, cold rolling
This specification is by cold work reinforced, and deformation technique is that Φ 250 × 20mm is cold-rolled to Φ 192 × 18mm, and relative reduction in area is 31.5%.
Ten, aligning and crop
Cold working is complete, performs finishing procedure, aligning and crop.Aligning ensures steel pipe linearity, and crop ensures that steel pipe section gradient meets standard-required.
11, detect a flaw, spray is marked, packaging
Flaw detection, spray mark, packaging can be delivered.
Produce by above-mentioned steps, production tube surrender 820MPa, tension 855MPa, unit elongation 30%, ballistic work 150-200J.
based austenite non-corrosive metal pipe embodiment 2
The present embodiment mass percent is:
C 0.013， Si 0.21， Mn 0.58， P 0.021， S 0.002，
Cr 26.33， Ni 31.20， Mo 3.88， Cu 0.83， N 0.11，
All the other are iron and its impurity element of trace.
This enforcement specification is Φ 195 × 25 × 6000mm, and the detected result after cold working is, surrender 830MPa, tension 900MPa, unit elongation 25%, ballistic work 150-200J.
manufacture method embodiment 2
One, smelt
Pretreated molten iron is after electric furnace+AOD furnace refining, and the Ingredient percent of molten steel reaches following requirement and can tap:
C 0.013， Si 0.21， Mn 0.58， P 0.021， S 0.002，
Cr 26.33， Ni 31.20， Mo 3.88， Cu 0.83， N 0.11，
All the other are iron and its impurity element of trace.
Two, steel billet is poured into a mould
Adopt the ingot mould of 9 tons, above-mentioned pouring molten steel is become the electrode blank of Φ 800mm.
Three, esr
Adopt argon shield esr mode, ingot shape is Φ 500mm.Water time 52s is entered after remelting.
Four, homogenizing anneal
Annealing temperature controls at 1200 ~ 1220 DEG C, annealing time 25h.
Five, blank forging
A heats
By heating steel billet, soaking temperature is 1180 DEG C, heat-up time 600min, soaking time is 60min, guarantees that steel billet is grilled thoroughly, evenly.
B forges solid pipe billet
During forging solid pipe billet, the temperature opening forging is 1153 DEG C, and most final forging temperature is 1011 DEG C.Enter water time 65s after having forged, forging is of a size of Φ 400mm.
Six, pipe prepares
Pipe prepares to comprise sawing, gun drilling, chamfering three operations.Sawing length 800mm/ props up; Gun drilling aperture 60mm; Chamfer dimesion R25.
Seven, hot extrusion
Preheating temperature is 950 DEG C, and warm up time is 400min, guarantees that preheating is even.Enter line frequency induction furnace heating after preheating, the temperature of heating is 1118 DEG C, and soaking time is 1.5min.Induction heating is complete, and pipe is delivered to staving press and carried out reaming, and rose bit is of a size of Φ 200mm, carries out glass powder lubrication before reaming at pipe surfaces externally and internally; Carry out line-frequency induction heating again after reaming, the temperature of secondary induction heating is 1175 DEG C; Secondary induction heating is complete, pipe is delivered in extrusion machine container after carrying out surfaces externally and internally glass powder lubrication and is extruded, and overflow mould is of a size of Φ 250mm, and squeezing needle is of a size of Φ 190mm, extrusion speed 200mm/s, extrudes the complete weldless steel tube obtaining Φ 250 × 30mm.
Eight, solid solution
The temperature of solid solution is 1181 DEG C, soaking time 60 minutes, Putting into water rapidly cooling after solid solution.
Nine, cold rolling
This specification is by cold rolling strengthening, and deformation technique is that Φ 250 × 30mm is cold-rolled to Φ 195 × 25mm, and relative reduction in area is 35%.
Ten, aligning and crop
Cold working is complete, performs finishing procedure, aligning and crop.Aligning ensures steel pipe linearity, and crop ensures that steel pipe section gradient meets standard-required.
11, detect a flaw, spray is marked, packaging
Flaw detection, spray mark, packaging can be delivered.
Produce by above-mentioned steps, production tube surrender 830MPa, tension 900MPa, unit elongation 25%, ballistic work 150-200J.
Claims (9)
1. a corrosion resistant iron base austenite oil well pipe, its chemical composition (weight percent) is:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%，
All the other are iron and its impurity element of trace.
2. corrosion resistant iron base austenite oil well pipe according to claim 1, is characterized in that the content also containing N, N is 0.05% ~ 0.30%.
3., according to described corrosion resistant iron base austenite oil well pipe arbitrary in claim 1 or 2, it is characterized in that: its wall thickness at 15mm ~ 40mm, through hot extrusion, solid solution and cold-drawn, yield strength is at more than 760MPa, more than tensile strength 793MPa, unit elongation more than 20%, more than ballistic work 100J.
4. corrosion resistant iron base austenite oil well pipe according to claim 3, it is characterized in that: it is in the NaCl solution of concentration 37%, the CO2 stress corrosion (SCC) of H2S and 1.1MPa of resistance to 0.6MPa and H 2 S stress corrosion (SSC), meet the strictest slow strain-gauge test and require (SSRT).
5. a manufacture method for corrosion resistant iron base austenite oil well pipe, comprises following step successively:
i, smelt
Pretreated molten iron is after converter or electrosmelting and AOD or VOD refining, and molten steel composition percentage ratio reaches following requirement and can tap:
0＜C≤0.03%， 0＜Si≤1.00%， 0＜Mn≤2.50%， P≤0.03%，
S≤0.03%， Cr 20.0%～28.0%， Ni 20.0%～38.0%，
Mo 3.0%～5.0%， Cu 0.50%～2.00%，
All the other are iron and its impurity element of trace;
iI, cast steel billet
By above-mentioned continuous casting of molten steel or be molded into steel billet;
iII, esr
Adopt argon shield electroslag remelting furnace and ingot shape, after remelting, in 2min, enter water cooling;
iV, homogenizing anneal
Annealing temperature controls at 1150 ~ 1250 DEG C, annealing time 20 ~ 40h;
v, blank forging
A heats
By heating steel billet, soaking temperature is 1100-1200 DEG C, and heat-up time, according to steel billet THICKNESS CALCULATION, gets 1-2min/mm, and soaking time is 30-60min, guarantees that steel billet is grilled thoroughly, evenly;
B rolling or forging solid pipe billet
When rolling or forging solid pipe billet, open rolling or the temperature opening forging are 1100 ~ 1200 DEG C, and minimum finish to gauge or final forging temperature are 1000-1060 DEG C; Forge in rear 2min and entered water cooling;
vI, pipe prepare
Pipe prepares to comprise sawing, gun drilling, chamfering three operations; Sawing carries out cutting according to the dimensional requirement of steel pipe; Gun drilling be by cutting after pipe carry out centre-drilling hole; Chamfering be by boring after pipe carry out two ends chamfered edge;
vII, hot extrusion
The preheating of advanced line pipe base, preheating temperature is 600-1000 DEG C, and warm up time is pipe diameter × (1-2) min;
Enter line frequency induction furnace heating after preheating, the temperature of heating is 1100-1150 DEG C, and soaking time is 1-5min, and after induction heating, temperature head is within 20 DEG C;
Then pipe carries out reaming, carries out glass powder lubrication before reaming at pipe surfaces externally and internally; Carry out secondary induction heating again after reaming, the temperature of secondary induction heating is between 1150-1200 DEG C;
Secondary induction heating is complete, and pipe is delivered in extrusion machine container after carrying out surfaces externally and internally glass powder lubrication and extruded, and extrusion speed is generally 100-300mm/s, is crushed to weldless steel tube; Extrude complete air cooling to room temperature;
vIII, solid solution
The temperature of solid solution is 1150 ~ 1200 DEG C, and soaking time is determined according to thickness of steel pipe, is generally wall thickness × (2-3) minute, Putting into water rapidly cooling in 30 seconds after solid solution;
Ⅸ, cold-drawn (rolling)
The cooled weldless steel tube of solid solution, carry out cold rolling, cold-drawn, the minimum a kind of deformation strengthening mode of aligning, control section shrinking percentage, 20 ~ 40%, makes oil well pipe.
6. the manufacture method of corrosion resistant iron base austenite oil well pipe according to claim 5, is characterized in that: in step
Ⅸafter cold-drawn, (cold working is complete) also performs finishing procedure and carries out step
Ⅹaligning and crop, aligning ensures steel pipe linearity, and crop ensures that steel pipe section gradient meets standard-required.
7., according to the manufacture method of described corrosion resistant iron base austenite oil well pipe arbitrary in claim 5 or 6, what it is characterized in that it manufactures is the steel pipe of wall thickness 15-40mm.
8., according to the manufacture method of described corrosion resistant iron base austenite oil well pipe arbitrary in claim 5 or 6, its steps characteristic is:
In step
iin smelting, the content smelted also containing N, N in the molten steel composition is 0.05% ~ 0.30%.
9. the manufacture method of corrosion resistant iron base austenite oil well pipe according to claim 7, its steps characteristic is:
In step
iin smelting, the content smelted also containing N, N in the molten steel composition is 0.05% ~ 0.30%.
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