CN101892432A - Manufacturing method of X70QS seamless line pipe for acid environment - Google Patents
Manufacturing method of X70QS seamless line pipe for acid environment Download PDFInfo
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Abstract
The invention provides a manufacturing method of an X70QS seamless line pipe for an acid environment, comprising the following steps: 1. steelmaking, i.e. electrosmelting, external refining, carrying out VD or RH vacuum treatment, carrying out silicon-calcium wire treatment, and adopting a continuous-casting short-flow process combined with a clean steel smelting technology for controlling the content of P, S and inclusions; 2. tube rolling, i.e. adopting a hot-rolling seamless pipe process at the continuous rolling temperature of more than 950 DEG C, jointly controlling the dimensional precision of the tube by a PQF three-roll mill and a tension-reducing mill or a sizing mill; and 3. heat treatment, i.e. under the quenching temperature of 910-980 DEG C and the tempering temperature of 550-730 DEG C, carrying out high-temperature sizing and straightening control at the temperature of 480-630 DEG C to guarantee performance and size of the pipe. The manufacturing method has the advantages of accurate composition design, high dimensional control accuracy, low manufacturing cost and easy production; and the pipe obtained by the method has good mechanical property and good corrosion resistance, thus being applicable to a high-pressure gas delivery pipeline under an acid condition.
Description
Technical field
The present invention relates to corrosion resistant material and seamless tube and make the field, be applicable to that particularly sour environment has the high strength of the corrosion resistance nature (manufacture method of 〉=485MPa) X 70 QS seamless line pipe for acid environment.
Background technology
Along with the continuous increase of oil, Natural gas consumption in recent years, accelerated the development of line of pipes.Because the compressibility of Sweet natural gas, thereby the transfer pressure of pneumatic tube will be high than transition pipeline.The pressure of external most gas pipe lines is brought up to 8.0～12MPa from 4.5 early stage～6.4MPa in recent years, and the pipeline that has has then reached 14～15.7MPa, thereby the grade of steel of pneumatic tube is also correspondingly improved.The intensity of steel for pipe is high more, and wall thickness and bore can corresponding minimizings under the prerequisite that does not influence gas transmission safety, saved long steel using amount apart from natural gas transmission pipeline greatly, can also bring the decline of comprehensive costs such as executive cost, welding material.In NACE, use H
2The critical dividing potential drop P of S
H2S=0.0348MPa distinguishes the gaseous corrosion power.Work as P
H2SDuring＜0.0348MPa, be referred to as nonacid gas (Sweet Gas); And work as P
H2SDuring＞0.0348MPa, be referred to as sour gas (SourGas).Carry the environment of the tubing use of sour gas to be called sour environment.Sour environment will consider not only that with line pipe the intensity of material satisfies the conveying requirement, and what more will consider is the corrosion resistance nature of material.The Sweet natural gas of Shu Songing no longer is through dehydration, takes off H from now on
2" sweet gas " (PH that S handles
2S≤300Pa), and will be undressed " rich gas " (PH
2S＞300Pa), for this reason must improve the anti-hydrogen induced cracking (HIC) and the anti-H of pipeline steel
2The performance of S stress corrosion.Therefore, pipeline constantly developed to erosion resistance high strength direction in recent years.
The anti-H 2 S pipe line steel that domestic many Steel Plant produced is the hot-rolled sheet coil pipe line steel.Seamless tube is the strong point field in heavy wall, high strength, middle high alloy, corrosion-resistant, small serial production, is better than Welded Steel Pipe.Disclose " acicular ferrite type X70 pipe line steel and manufacture method thereof with high arrest toughness " among the patent CN 1746326A, this invention belongs to the hot-rolled coil pipe line steel, non-anticorrosive field.Disclose " a kind of economical X 70 pipeline steel and production method thereof " among the patent CN 101270440A, this invention belongs to the non-HIC resistance pipeline steel of Ultra-low carbon field.Disclose " high-strength high-ductility X 70 thick-wall seamless pipeline steel and manufacture method " among the CN 101343715A, this invention is the anticorrosive seamless tube spool of nonacid usefulness field.Disclose " good pipe line steel of anti-HIC and the line pipe that produces with these steel " among the patent CN 1914341A, it is too wide that this invention C, Mn etc. influence the composition range of intensity, and clear and definite grade of steel is not arranged.The too conference of fluctuating of the composition of C, Mn causes the unstable properties of line pipe.And add elements such as Ti, B, Ti forms the TiN compound and is unfavorable for the stable impact performance.Disclose among the CN 101082383A " a kind of oil-gas gathering and transportation of hydrogen sulfide corrosion resistant with seamless tube and manufacture method thereof ", this invention C, Mn composition range are too wide, and P, S content requirement are not high, have exceeded API 5L to being used for the requirement of acid steel pipe of being on active service.Disclose " a kind of Ultra-low carbon high tenacity anti-H 2 S steel for gas delivering pipeline " among the CN 1351189A, this invention belongs to Ultra-low carbon pipe line steel field, and has only reached the X65 grade of steel.Sour environment does not appear in the newspapers with the manufacturing process of high strength seamless tube.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the manufacture method that the purpose of this invention is to provide a kind of X 70 QS seamless line pipe for acid environment, the composition span of control is narrow, and alloying and microalloying are shared, satisfies the requirement of sour environment to double-strength pipe spool corrosion resistance nature.
For realizing goal of the invention, the technical solution used in the present invention provides a kind of manufacture method of X 70 QS seamless line pipe for acid environment, and this method may further comprise the steps:
1. described X 70 QS seamless line pipe for acid environment steel grades weight % be: C 0.06～0.14%, and Si 0.20～0.45%, and Mn 1.00～1.30%, P≤0.015%, S≤0.003%, Ni≤0.10%, Cu≤0.20%, Cr 0.05～0.30%, and Mo 0.05～0.30%, Al 0.015～0.060%, N 0.003～0.010%, and Nb 0.030～0.050%, and V 0.05～0.09%, Ca≤0.060%, surplus are Fe and impurity.Carbon equivalent ce pcm≤0.22%, CE
IIW≤ 0.39%; It is characterized in that the composition narrow range, low-carbon microalloyed, and Cr+Mo content wants 〉=0.15%, Cr+Mo+Mn≤1.80%.
2. steel-making adopts high-quality steel scrap and alloy as raw material, by abbreviated system route EAF, LF, VD or RH, FW, CCM and in conjunction with microalloying, Clean Steel smelt, inclusion modification obtains the qualified circular steel billet of surface quality;
3. tube rolling will be justified base at the rotary heating furnace internal heating, furnace temperature is higher than 1200 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1300 ℃ of hot piercing temperature, 950～1200 ℃ of tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, controlling dimension precision, the outer warp ± 0.75%D of body, wall thickness is controlled at ± 12.5%t, straight degree is whole less than 0.15%, out of roundness less than 1%D after with the steel pipe made through non-destructive test(ing)(NDT) and finishing, control surface quality;
4. steel pipe thermal treatment and the above-mentioned steel pipe of processing are heated to 910～980 ℃ in the quenching process furnace, quench, and are incubated water-cooled behind 15～60min according to the difference of wall thickness, are heated to 550～730 ℃ then in the tempering process furnace, carry out tempering; Adopt 480～630 ℃ of high temperature sizings and aligning, the dimensional precision of control body, the mechanical property of assurance body.
The performance of the line pipe that can produce by the rolling technology of seamless tube according to technical solution of the present invention can reach following requirement:
1. tensile property: yield strength: 485～635MPa, tensile strength: 570～760MPa yield tensile ratio :≤0.90
2.V type notch shock performance:
Ballistic work: 0 ℃ of test temperature, laterally, full-scale Charpy-V impact power 〉=200J, shear area 100%.
3. hardness test: HV10≤248
4. metallographic structure: be organized as F+B
Return8.5 grades of grain fineness numbers or thinner.
5. anti-HIC performance:
Press NACE TM0284-2003 standard, under A solution and B solution trial condition, soak 96 hours test samples respectively, be and crackle occurs, what the strength level that all satisfies the X70 grade of steel required down standard requires crack length rate≤10%, crack thickness rate≤3, the responsive rate of crackle≤2%, have excellent anti-HIC performance, satisfy under the acidic conditions corrosion resistance nature requirement fully transfer lime.
6. anti-H
2S stress corrosion crack performance
According to the requirement of API 5L standard, adopt NACE-0177-2005 standard A solution, adopt the test of four-point bending method, 80% loads, appearance fracture in 720 hours.
The invention has the beneficial effects as follows: 1) composition design control is strict, and especially element such as C, Mn fluctuation range is little, has guaranteed stable carbon equivalent ce, PCM, is beneficial to the stability of performance; 2) adopt short cheaply flow process steel-making, the seamless hot rolling technology of PQF milling train and quenching-and-tempering process, guarantee the geometrical dimension and the excellent performance of body; 3) impact property of excellence under the high strength is even can guarantee also that at-40 ℃ ballistic work is greater than 150J, far above ballistic work standard values such as API, ISO; 4) good welds performance.By control CE, PCM, quantized assurance is welding property preferably; 5) has high ductility.Low yield strength ratio, high elongation rate; 6) have good anti-HIC performance, guarantee in yield strength, the responsive rate (CSR)≤2% of crackle, crack length rate≤10%, crack thickness rate (CTR)≤3% greater than under the 485MPa.7) anti-H
2S stress corrosion crack performance adopts NACE-0177-2005 standard A solution, adopts the test of four-point bending method, and 80% loads, appearance fracture in 720 hours
Description of drawings
Fig. 1 is the metallographic structure of X70QS grade of steel line pipe of the present invention;
Fig. 2 is the tough linearity curve of X70QS grade of steel line pipe of the present invention.
Embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the manufacture method of X 70 QS seamless line pipe for acid environment of the present invention.
The technical solution used in the present invention provides a kind of manufacture method of X 70 QS seamless line pipe for acid environment, and this method may further comprise the steps:
1, steel-making
Rational chemical proportioning and suitable process for making are the indispensabilities that obtains qualified hot rolling mother metal.
Adopting high-quality steel scrap and alloy is raw material, and the steel grades weight % of configuration is: C 0.06～0.14%, and Si 0.20～0.45%, Mn 1.00～1.30%, P≤0.015%, S≤0.003%, Ni≤0.10%, Cu≤0.20%, Cr 0.05～0.30%, Mo 0.05～0.30%, and Al 0.015～0.060%, and N 0.003～0.010%, Nb 0.030～0.050%, V 0.05～0.09%, Ca≤0.060%, and surplus is Fe and impurity.Carbon equivalent ce pcm≤0.22%, CE
IIW≤ 0.39%.
The concrete chemical ingredients of optimizing is described as follows:
C: consider intensity and the flexible influence of carbon content to steel, generally carbon content surpasses the banded generation of 0.14% meeting aggravation, is unfavorable for anti-HIC, takes all factors into consideration, and C content is controlled between 0.06～0.14%.
Si:Si is the element of effective deoxidation, and can improve the intensity of steel, can reduce toughness and solidity to corrosion but add a large amount of silicon, so its content is placed restrictions in 0.20～0.45% scope.
Mn:Mn has very strong deoxidizing capacity, from erosion-resisting angle, its maximum level is controlled at below 1.30%.The addition of Mn too much can reduce the toughness of steel, promotes harmful element P, S, Sn, Sb etc. to grain boundary segregation again, and P, Sn, the Sb etc. that are segregated in crystal boundary with H interaction can take place, thereby the crystal boundary linkage force is descended significantly, causes that easily hydrogen causes along brilliant fracture.By data statistics and experience, so its content is placed restrictions in 1.00～1.30% scopes.
P, S:P and S are impurity elements.The cost of comprehensive solidity to corrosion and steel-making is controlled at P≤0.015%, S≤0.003% with impurity content.
Al:Al be killed steel the element that must add, its content is lower than at 0.005% o'clock can not reach deoxidation effect, but during too high levels, easily causes inclusion to increase, and produces hairline, reduces toughness and processing characteristics, therefore controls Als 0.015～0.060%.
Nb:Nb is the micro alloying element that adds, and the amount of Nb adds too high, is prone to rolling shortcoming in the operation of rolling, influences the surface quality of steel.Control its content between 0.030～0.050%.
V:V has higher precipitation strength effect, and V is together by improve the intensity of steel in the ferrite with the VC precipitation strength.Control V content is between 0.05～0.09%.And V+Nb 〉=0.09%.
Cr:Cr is an alloy element, add the Cr element on a small quantity and can improve intensity, and antagonism general corrosion performance is favourable, in order to guarantee welding property, controls its scope content between 0.05～0.30%.
Mo:Mo also is an alloy element, and a small amount of interpolation can improve intensity and corrosion resistance, by optimizing proportioning, its content is controlled at 0.05～0.30%, and Cr+Mo content wants 〉=0.15%, Cr+Mo+Mn≤1.80%.
Cu, Ni:Cu, Ni are the steel grade residual metal, and non-alloy element is wanted strict its content of control, reduces its content as far as possible and reduces its contribution to carbon equivalent, and the maximum level that allows it is Ni≤0.10%, Cu≤0.20%.
The steel pipe composition characteristic is a low-carbon (LC) control manganese, and Cr, Mo are element alloyed, and content wants 〉=0.15%, Cr+Mo+Mn≤1.80%.Nb, V element microalloying, the content of restriction Cu, Ni residual content and impurity element P, S, and the upper limit and the N content of regulation C content, guarantee Al/N 〉=2, high purity steel by a large amount of test and Selection reasonable component proportionings, is given with good anti-HIC performance in Ca/S 〉=1.
Adopt general in the world abbreviated system EAF, LF, VD or RH, FW, CCM and in conjunction with microalloying, Clean Steel smelt, inclusion modification obtains the qualified circular steel billet of surface quality.Concrete Control essentials is as follows:
EAF: Electric furnace steel making, impurity element P content during the control tapping guarantees that P is less than 0.015%.
LF: ladle furnace refining, the content of adjustment alloying element.
VD or RH: vacuum metling, below the condition of high vacuum degree 66.7Pa, the bag BOTTOM ARGON BLOWING keeps more than the 10min, arrive decarburization, desulfurization and the degassing, promote inclusion floating, the H content in the steel is taken off below the 2ppm, and O, N and S content are low, and inclusion is few, molten steel cleanliness factor height.
FW: bag core silk is fed silk and is handled, and by changing inclusion morphology to molten steel feeding Si-Ca silk, makes the MnS of strip be mingled with the spherical complex inclusion that is transformed into Ca, thereby improves toughness, anisotropic properties, the reduction unrelieved stress of steel, improves corrosion resistance.CaSi feed quantity 〉=100m/ stove stirs time 〉=5min a little less than hello the silk back.
CCM: continuous casting, adopt the protection steel pipe that has the Ar hermetic seal, middle covering agent, the protection casting modern technique of submerged nozzle and crystallizer protecting residue is isolated molten steel and air fully, prevents the secondary oxidation of molten steel in casting cycle.The diameter tolerance of continuous casting circular tube blank≤± 1.4%, ovality tolerance≤2.5%, the geometrical dimension and the form accuracy of assurance hollow billet
2, tube rolling
Adopt the hot rolling technology of pre-punching and finish rolling.To justify base at the rotary heating furnace internal heating, furnace temperature is higher than 1200 ℃, heating of pipe blank temperature deviation ± 10 ℃, 1220～1300 ℃ of hot piercing temperature, 980～1200 ℃ of tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, controlling dimension precision, the outer warp ± 0.75%D of body, wall thickness is controlled at ± 12.5%t, straight degree is whole less than 0.15%, out of roundness less than 1%D after with the steel pipe made through non-destructive test(ing)(NDT) and finishing, control surface quality.
3, steel pipe thermal treatment and processing
Above-mentioned steel pipe is heated to 910～980 ℃ in the quenching process furnace, quench, and is incubated water-cooled behind 15～60min according to the difference of wall thickness, is heated to 550～730 ℃ then in the tempering process furnace, carries out tempering; Adopt 480～630 ℃ of high temperature sizings and aligning, the dimensional precision of control body, the mechanical property of assurance body.
The performance of the line pipe that can produce by the rolling technology of seamless tube according to technical solution of the present invention can reach following requirement:
1. tensile property: yield strength: 485～635MPa, tensile strength: 570～760MPa yield tensile ratio :≤0.90
2.V type notch shock performance:
Ballistic work: 0 ℃ of test temperature, laterally, full-scale Charpy-V impact power 〉=230J, shear area 100%.As shown in Figure 1.
3. hardness test :≤248HV10
4. metallographic structure: 8.5 grades of grain fineness numbers or thinner.Be organized as F+B
ReturnAs shown in Figure 2.
5. corrosion resistance:
Press NACE TM0284-2003 standard, under A solution and B solution trial condition, soak 96 hours test samples respectively, be and crackle occurs, what the strength level that all satisfies the X70 grade of steel required down standard requires crack length rate≤10%, crack thickness rate≤3, the responsive rate of crackle≤2%, have excellent anti-HIC performance, satisfy under the acidic conditions corrosion resistance nature requirement fully transfer lime.Anti-H
2S stress corrosion crack performance adopts the test of four-point bending method according to the NACE-0177-2005 standard, A solution, and 80% loads, and occurs rupturing in 720 hours.
With the X70QS grade of steel, specification Φ 406.4 * 17.5mm is an example, its chemical ingredients such as following table 1 and table 2.Mechanical property such as following table 3.Anti-HIC performance sees Table 4.
Tubing chemical component table 1 satisfies the requirement of above-mentioned seamless tube spool composition fully, S and P content are lower, satisfied the composition designing requirement, and from the statistical distribution result each stove component content deviation is very little as can be seen, carry out temperature control when stable component content helps thermal treatment, thereby have favorable tissue and performance provides precondition for tubing.As can be seen from Table 3, the present invention can satisfy the X70QS line pipe well, and yield tensile ratio is very little, has very high toughness, very low hardness value, thus guarantee to have very high corrosion resistance.Can the result from hydrogen sulfide corrosion resistance, do SSC (table 5) anti-corrosion test with actual yield strength at the line pipe sample of 560MPa, the sour environment of NACE A solutions simulate is that example is as shown in table 4, and 720h does not rupture, and has excellent anti-H 2 S stress corrosion performance; From anti-HIC test-results table 4, no matter in the solution of acidic solution and synthetic seawater, all have very strong anti-HIC performance, all do not find hydrogen induced cracking (HIC) crackle and hydrogen blistering, having obvious characteristics is to have good anti-HIC performance under yield strength 〉=485MPa, the responsive rate (CSR)≤2% of crackle, crack length rate≤10%, crack thickness rate (CTR)≤3%.
The embodiment chemical ingredients of table 1 line pipe of the present invention
| Sequence number | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Al | V | Nb | Ca | N |
| 1 | 0.11 | 0.21 | 1.13 | 0.01 | 0.001 | 0.03 | 0.19 | 0.06 | 0.1 | 0.03 | 0.06 | 0.04 | 0.0012 | 0.0042 |
| 2 | 0.11 | 0.21 | 1.14 | 0.010 | 0.001 | 0.03 | 0.2 | 0.06 | 0.11 | 0.032 | 0.06 | 0.04 | 0.0010 | 0.0031 |
| 3 | 0.11 | 0.27 | 1.16 | 0.01 | 0.001 | 0.03 | 0.18 | 0.07 | 0.07 | 0.032 | 0.06 | 0.04 | 0.0013 | 0.0049 |
| 4 | 0.10 | 0.27 | 1.16 | 0.010 | 0.002 | 0.03 | 0.20 | 0.06 | 0.08 | 0.035 | 0.07 | 0.031 | 0.0028 | 0.0075 |
| 5 | 0.11 | 0.26 | 1.17 | 0.01 | 0.001 | 0.02 | 0.2 | 0.06 | 0.07 | 0.034 | 0.06 | 0.04 | 0.0013 | 0.0055 |
| 6 | 0.10 | 0.22 | 1.15 | 0.011 | 0.002 | 0.03 | 0.20 | 0.06 | 0.08 | 0.032 | 0.07 | 0.032 | 0.0020 | 0.0040 |
The carbon equivalent of the embodiment of table 2 line pipe of the present invention and element ratio
| Sequence number | pcm | ceq | Ca/S | Al/N |
| 1 | 0.200 | 0.369 | 1.2 | 7.1 |
| 2 | 0.201 | 0.373 | 1 | 10.3 |
| 3 | 0.201 | 0.372 | 1.3 | 4.3 |
| 4 | 0.195 | 0.367 | 1.4 | 4.7 |
| 5 | 0.202 | 0.375 | 1.3 | 6.2 |
| 6 | 0.193 | 0.365 | 1 | 8 |
Mechanical property and the metallographic of table 3 line pipe embodiment of the present invention
The HIC test-results of table 4 line pipe embodiment of the present invention
The SSC test-results of table 5 line pipe embodiment of the present invention
| Test piece number (Test pc No.) | Specimen size (mm) | Test temperature (℃) | Actual yield strength (Mpa) | Actual loaded ratio (%) | Actual loaded amount of deflection (mm) | Test period (h) | Test-results |
| 1 | 115.24×15.09×5.01 | 22～26 | 560 | 90.3 | 1.12 | 757 | 720h does not have crackle and fracture |
| 2 | 115.24×15.09×5.01 | 22～26 | 560 | 90.3 | 1.12 | 757 | 720h does not have crackle and fracture |
| 3 | 115.24×15.09×5.01 | 22～26 | 560 | 90.3 | 1.12 | 757 | 720h does not have crackle and fracture |
Claims (6)
1. manufacture method of producing X 70 QS seamless line pipe for acid environment, this method may further comprise the steps:
1. described X 70 QS seamless line pipe for acid environment steel grades weight % be: C 0.06～0.14%, and Si 0.20～0.45%, and Mn 1.00～1.30%, P≤0.015%, S≤0.003%, Ni≤0.10%, Cu≤0.20%, Cr 0.05～0.30%, and Mo 0.05～0.30%, Al 0.015～0.060%, and N 0.003～0.010%, and Nb 0.030～0.050%, V 0.05～0.09%, Ca≤0.060%, and surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE
IIW≤ 0.39%;
2. steel-making adopts high-quality steel scrap and alloy set by step 1. as raw material, by the flow process route be EAF, LF, VD or RH, FW, CCM and in conjunction with microalloying, Clean Steel smelt, the inclusion modification technology, obtain circular steel billet;
3. tube rolling with above-mentioned round base at the rotary heating furnace internal heating, 1200～1320 ℃ of furnace temperature, heating of pipe blank temperature deviation ± 10 ℃, 1220～1300 ℃ of hot piercing temperature, 950～1200 ℃ of tandem rolling unit tandem rolling temperature, 880～980 ℃ of sizing temperature, the controlling dimension precision is: body external diameter ± 0.75%D, wall thickness are controlled at ± 12.5%t, and straight degree is whole less than 0.15%, out of roundness is less than 1%D, afterwards with the steel pipe process non-destructive test(ing)(NDT) and the finishing of making;
4. steel pipe thermal treatment and the above-mentioned steel pipe of processing are heated to 910～980 ℃ in the quenching process furnace, quench, and are incubated water-cooled behind 15～60min according to the difference of wall thickness, are heated to 550～730 ℃ then in the tempering process furnace, carry out tempering; Adopt 480～630 ℃ of high temperature sizings and aligning, adjust the dimensional precision of body.
2. according to the described manufacture method of claim 1, it is characterized in that: described step 1. middle composition Cr, Mo, Mn addition want 〉=0.15%, Cr+Mo+Mn≤1.80% for Cr+Mo content.
3. according to the described manufacture method of claim 1, it is characterized in that: described step is 2. middle to adopt the silico-calcium silk to make inclusion modification, adopts the weak stirring means of vacuum outgas and argon gas, impels inclusion fully to float.
4. according to the described manufacture method of claim 1, it is characterized in that: the rolling accuracy of described step in 3. is outside diameter control precision ± 0.75%D, wall thickness control accuracy ± 12.5%t.
5. according to the described manufacture method of claim 1, it is characterized in that: described step 4. in, through the mechanical performance index of heat treated steel pipe be:
Yield strength: 485～635MPa
Tensile strength: 570～760MPa
Yield tensile ratio :≤0.90
Unit elongation: 〉=20%
Ballistic work: horizontal full-scale Charpy-V impact power 〉=230J
Hardness :≤248HV10.
6. according to the described manufacture method of claim 1, it is characterized in that: described step 4. in, be F+B through the metallographic structure of heat treated steel pipe
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| CN114438406A (en) * | 2021-12-27 | 2022-05-06 | 天津钢管制造有限公司 | Mechanical composite pipe seamless main pipe for acid environment |
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