CN103290189A - X90Q medium thick-wall seamless steel tube and method for manufacturing same - Google Patents

X90Q medium thick-wall seamless steel tube and method for manufacturing same Download PDF

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CN103290189A
CN103290189A CN2013102391791A CN201310239179A CN103290189A CN 103290189 A CN103290189 A CN 103290189A CN 2013102391791 A CN2013102391791 A CN 2013102391791A CN 201310239179 A CN201310239179 A CN 201310239179A CN 103290189 A CN103290189 A CN 103290189A
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thick
seamless steel
steel pipes
walled seamless
axial flow
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王俊
欧洋
宋令玺
崔邛
陈坤
蒋世川
邹友富
易兴俊
田晓凡
杜思敏
蒲仕海
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Pangang Group Chengdu Steel and Vanadium Co Ltd
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Pangang Group Chengdu Steel and Vanadium Co Ltd
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Abstract

The invention provides an X90Q medium thick-wall seamless steel tube and a production method of the X90Q medium thick-wall seamless steel tube. The method comprises the following steps of: obtaining a target steel liquid through smelting, wherein the target steel liquid comprises the following components: 0.11-0.15% of C, 0.17-0.37% of Si, 1.40-1.60% of Mn, 0-0.018% of P, 0-0.008% of S, 0.020-0.050% of Al, 0.03-0.05% of Nb, 0-0.010% of N, 0.0008-0.0018% of B, less than or equal to 0.20% of Cu, less than or equal to 0.10% of V, less than or equal to 0.06% of Ti, and the balance of Fe and inevitable impurities, and the sum of the contents of Nb, V and Ti in the target steel liquid is not higher than 0.15%, CEIIW is less than or equal to 0.43, and CEpcm is less than or equal to 0.24; performing continuous casting and rolling so as to form a seamless steel tube having the wall thickness in the range from 20 to 40 mm; performing quenching plus tempering at a quenching temperature in the range from 890 to 950 DEG C; performing water quenching cooling until the temperature reaches a room temperature by the way of external spraying plus internal axial flow, and cooling in air after tempering, wherein the tempering heating temperature is in the range from 500 to 560 DEG C. The method provided by the invention is capable of preparing the X90Q medium thick-wall seamless steel tube with excellent mechanical properties without adding any noble metal element.

Description

Thick-walled seamless steel pipes and manufacture method thereof among the X90Q
Technical field
The invention belongs to the weldless steel tube technical field, specifically, relate to thick-walled seamless steel pipes and manufacture method thereof among the X90Q.
Background technology
Usually, thick-walled seamless steel pipes is a kind of high strength, high tenacity line pipe among the X90Q.
Increasingly mature along with the continuous development of petroleum industry, pipe transportation technology, and the needs of the active and localization process of international petroleum market, simultaneously for reducing investment, the trucking costs of pipeline construction engineering, adopt the pipeline steel tube of high strength grade also more economically with rationally, therefore need a large amount of high grade of steel line pipes.
In the weldless steel tube industry, successfully develop the X100 level at present in the world, and domestic great majority also are in X70, X80, only a few is developed the X90 level.In order to catch up with the step of the world's high grade of steel weldless steel tube development, and the level that remains ahead at home, the high grade of steel weldless steel tube of exploitation X90 level is imperative.
Chinese patent literature CN102051527A discloses a kind of X90 level thick-walled seamless steel pipes: by weight percentage, its chemical ingredients proportioning is: 0.08~0.12%C, 0.20~0.32%Si, 1.25~1.35%Mn is not more than 0.015%P, is not more than 0.010%S, 0.016~0.042%Al, 0.03~0.05%Nb, 0.05~0.07%V, 0.12~0.18%Cu; A certain amount of Cr, Mo, N, all the other are Fe and unavoidable impurities.European patent document EP1918400A1 discloses a kind of for the manufacture of the steel alloy that is not less than X80 level weldless steel tube, its chemical ingredients is: 0.02~0.08%C, be not more than 0.5%Si, 1.5~3.0%Mn, be not more than 0.03%P, be not more than 0.005%S, 0.001~0.10%Al, 0.4~1.2%Mo, 0.002~0.015%N, 0.0002~0.007%Ca, be not more than 0.005%O, be not more than 0.0005%B, 0.185~0.250 Pcm, all the other are Fe and unavoidable impurities; Its finished product be organized as bainite and length is no more than 20 microns cementite tissue.
As can be seen, the chemical ingredients of the high grade of steel weldless steel tube of the X90 level that relates in the above-mentioned patent documentation and more low-level X80 level weldless steel tube has all been added a certain amount of precious metal (comprising Mo, Cr etc.), and material cost is higher; For guaranteeing lower carbon equivalent, need C is reduced to lower degree simultaneously, this has also increased smelting cost.
Summary of the invention
At the deficiencies in the prior art, one of purpose of the present invention is to provide thick-walled seamless steel pipes and production method thereof among a kind of X90Q cheaply.
To achieve these goals, an aspect of of the present present invention provides the production method of thick-walled seamless steel pipes among a kind of X90Q, described production method may further comprise the steps: smelt to form the target molten steel, the composition of described target molten steel is C:0.11~0.15% by weight percentage, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06%, surplus is Fe and inevitable impurity, and Nb in the described target molten steel, V, the content sum of Ti is not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24; Continuous casting and rolling is the weldless steel tube of 20~40mm to form wall thickness; Be that the weldless steel tube of 20~40mm quenches and adds tempering and handle to described wall thickness, wherein, quenching temperature is 890~950 ℃, the mode shrend of adopting outer spray to add interior axial flow is cooled to room temperature, and carry out outer spray earlier and carry out interior axial flow then, finish outer spray and interior axial flow when stopping simultaneously, carry out temper then, the tempering Heating temperature is 500~560 ℃, air cooling after the tempering.
Another aspect of the present invention provides thick-walled seamless steel pipes among a kind of X90Q, the composition of thick-walled seamless steel pipes is C:0.11~0.15% by weight percentage among the described X90Q, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06%, surplus is Fe and inevitable impurity, and Nb in the thick-walled seamless steel pipes among the described X90Q, V, the content sum of Ti is not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24.
Compared with prior art, the present invention can not add under the precious metal element situation of (comprising Mo, Cr, Ni), makes thick-walled seamless steel pipes among the X90Q that the wall thickness with good mechanical property is 20~40mm.
Embodiment
Hereinafter, will describe thick-walled seamless steel pipes and manufacture method thereof among the X90Q of the present invention in detail in conjunction with exemplary embodiment.
The production method of thick-walled seamless steel pipes may further comprise the steps among the X90Q according to an aspect of the present invention: smelt to form the target molten steel, the composition of described target molten steel is C:0.11~0.15% by weight percentage, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06%, surplus is Fe and inevitable impurity, and Nb in the described target molten steel, V, the content sum of Ti is not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24; Continuous casting and rolling is the weldless steel tube of 20~40mm to form wall thickness; Be that the weldless steel tube of 20~40mm quenches and adds tempering and handle to described wall thickness, wherein, quenching temperature is 890~950 ℃, the mode shrend of adopting outer spray to add interior axial flow is cooled to room temperature, and carry out outer spray earlier and carry out interior axial flow then, finish outer spray and interior axial flow when stopping simultaneously, carry out temper then, the tempering Heating temperature is 500~560 ℃, air cooling after the tempering.Wherein, CE IIWAnd CE PcmIt all is the expression symbol of carbon equivalent.When carbon content≤0.12%, carbon equivalent CE PcmExpression; When carbon content>0.12%, carbon equivalent CE IIWExpression.CE pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B,CE IIW=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B。)
In an exemplary embodiment of production method of the present invention, the composition of target molten steel is preferably C:0.125~0.145%, Si:0.20~0.35%, Mn:1.45~1.55%, P:0~0.018%, S:0~0.008%, Al:0.030~0.040%, Nb:0.035~0.045%, N:0~0.008%, B:0.0010~0.0015%, Cu≤0.10%, V≤0.04%, Ti≤0.03%, surplus is Fe and inevitable impurity, and, in the described target molten steel content sum of Nb, V, Ti in 0.05%~0.13% scope, CE IIWIn 0.28~0.40 scope, CE PcmIn 0.10~0.20 scope.
In an exemplary embodiment of production method of the present invention, described quenching temperature is preferably 905~940 ℃.
In an exemplary embodiment of production method of the present invention, in described quenching step, outer water spray is controlled to be 2500~3100m 3/ h is controlled to be 1200~2000m with the interior axial flow water yield 3/ h.
In an exemplary embodiment of production method of the present invention, in described quenching step, outer spray time is controlled to be 60~120 seconds, the interior axial flow time is controlled to be 60~120 seconds.
In an exemplary embodiment of production method of the present invention, the wall thickness of thick-walled seamless steel pipes is preferably 25~30mm among the described X90Q.
Thick-walled seamless steel pipes is in the composition design among the X90Q of the present invention, and for satisfying the good welding property of line pipe, carbon equivalent content is lower; Add the B element and can improve hardening capacity; Adding Nb can crystal grain thinning; And do not contain precious metal elements such as Mo, Cr, Ni among the present invention, thereby can reduce cost.Match with the mentioned component design, the present invention has adopted to quench and has added the heat treatment mode of tempering, specifically, quenching temperature is 890~950 ℃, and the mode shrend of adopting outer spray to add interior axial flow is cooled to room temperature, and carries out outer spray earlier and carry out interior axial flow then, finish outer spray and interior axial flow when stopping simultaneously, carry out temper then, the tempering Heating temperature is 500~560 ℃, air cooling after the tempering.Above-mentioned thermal treatment process of the present invention can guarantee the through hardening of whole wall thickness, it is even to have guaranteed effectively that again full body quenches, make that thick-walled seamless steel pipes obtains good performance by shrend among the X90Q, finally be met the desired intensity of X90Q grade of steel and toughness.In addition, if adopt continuous heat-treating drier, method of the present invention can mass-produce the X90Q steel pipe of excellent property.
The composition of thick-walled seamless steel pipes is C:0.11~0.15%, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06% by weight percentage among the X90Q according to a further aspect of the invention, surplus is Fe and inevitable impurity, and among the described X90Q in the thick-walled seamless steel pipes content sum of Nb, V, Ti be not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24.
In X90Q of the present invention in thick-walled seamless steel pipes exemplary embodiment, the composition of thick-walled seamless steel pipes is preferably C:0.125~0.145% by weight percentage among the described X90Q, Si:0.20~0.35%, Mn:1.45~1.55%, P:0~0.018%, S:0~0.008%, Al:0.030~0.040%, Nb:0.035~0.045%, N:0~0.008%, B:0.0010~0.0015%, Cu≤0.10%, V≤0.04%, Ti≤0.03%, surplus is Fe and inevitable impurity, and, Nb in the thick-walled seamless steel pipes among the described X90Q, V, the content sum of Ti is in 0.05%~0.13% scope, CE IIWIn 0.28~0.40 scope, CE PcmIn 0.10~0.20 scope.
In thick-walled seamless steel pipes exemplary embodiment, the wall thickness of thick-walled seamless steel pipes is 20~40mm among the described X90Q in X90Q of the present invention.
Come exemplary embodiment of the present invention is described in detail below in conjunction with concrete example, therefore do not limit the present invention among the described scope of embodiments.
Example 1
Adopt Electric furnace steel making, LF(ladle refining furnace) refining, VD(vacuum outgas) step such as processing obtains the steel grades as sample in the following table 11.
Specifically, the correlation parameter of steps such as Electric furnace steel making, LF refining, VD processing is as follows.
The starting material that enter electric furnace require to be molten iron: P≤0.090%, S≤0.050%, As≤0.02%, Sn≤0.01%; Steel scrap: a class steel scrap of tube head, base head, base tail or low five-harmful elements and residual element.
The correlation parameter of electrosmelting step is controlled to be: eaf tapping point control C 〉=0.05%, P≤0.010%; Electric furnace steel tapping temperature control: 1620~1680 ℃; Electric furnace steel tapping deoxidation alloying: BaSiAlCa add-on: by 3.0~4.0kg/t, Al piece 1.0~1.5kg/t.
The correlation parameter of LF refinement step is controlled to be: keep bottom blowing Ar unimpeded, Ar intensity is blown in control, and it is air-breathing to avoid molten steel to seethe; Strengthen the deoxidation operation, make the foamed white slag fast, white slag hold-time 〉=20min, and checked the color of refining slag every 5 minutes; Feed the Al line, finished product Al is controlled in specialized range.Refining finishes preceding 5~8min and adds FeTi, and add-on 1.0kg/t treats to add the B iron alloyization after little titanium is handled.Tapping temperature: 1650~1670 ℃.
The correlation parameter of VD vacuum-treat step is controlled to be: kept under vacuum tightness≤66.7Pa 15 minutes, and slag does not have obvious foaming and keeps more than the 2min; Feed Ca-Si silk 0.5~0.7kg/t behind the VD vacuum breaker, according to temperature-measuring results, molten steel is carried out the quiet processing of blowing, quiet blowing the time: 〉=10min, quietly blow requirement: Ar intensity is blown in strict control, and molten steel must not expose, the fine motion of molten steel face.Go out a jar temperature: 1590~1605 ℃; First stove is by middle upper limit control.
Then, above-mentioned molten steel composition is carried out continuous casting.Specifically, the continuous casting process is protected cast; The weak cold mode of two cold employings is poured into a mould; Strand adopts slow cooling (cheating cold), goes into to cheat temperature 〉=500 ℃, and strand goes out to cheat temperature≤100 ℃.
Next, the strand that continuous casting is obtained carries out hot rolling.Specifically, adopt 350 bases, guarantee ratio of forging reduction 〉=3, guarantee good thermal pretreatment tissue; Roll in 508 all milling train group weeks, ring furnace goes out 1230 ℃~1280 ℃ of boiler tube temperature, through perforation, tube rolling, take off pipe and sizing, rolls into specification and be thick-walled seamless steel pipes among 219.1 * 28 the X90Q.
Then, carry out modified thermal treatment.Specifically, thick-walled seamless steel pipes carries out modified thermal treatment at continous way walking-beam furnace production line among the X90Q, quenching temperature is 900 ℃, quench cooled is used shrend, spray+the interior axial flow type of cooling (namely outside quenching device adopts, adopt the mode of spray to cool off to the exterior periphery of weldless steel tube, the inside of weldless steel tube adopted along the water coolant of the whole axial flow of steel pipe cool off), simultaneously without the pressure roller device; Begin the outer interior axial flow that sprays, begins again during cooling earlier; Close outer spray and interior axial flow during end simultaneously.Outer spray time 82 seconds, 80 seconds interior axial flow time.Outer water spray 3080m 3/ h, interior axial flow water yield 1950m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and the tempering Heating temperature is 500 ℃, air cooling after the tempering.Mechanical property sees Table 2 after the steel pipe thermal treatment.
Example 2
Adopt with example 1 in the smelting step, i.e. Electric furnace steel making, LF(ladle refining furnace) refining, VD(vacuum outgas) step such as processing, obtain the steel grades as sample in the following table 12.
Then, above-mentioned molten steel composition is carried out continuous casting.Specifically, the continuous casting process is protected cast; The weak cold mode of two cold employings is poured into a mould; Strand adopts slow cooling (cheating cold), goes into to cheat temperature 〉=500 ℃, and strand goes out to cheat temperature≤100 ℃.
Next, the strand that continuous casting is obtained carries out hot rolling.Specifically, adopt 350 bases, guarantee ratio of forging reduction 〉=3, guarantee good thermal pretreatment tissue; Roll in 508 all milling train group weeks, ring furnace goes out 1270 ℃ of boiler tube temperature, through perforation, tube rolling, take off pipe and sizing, rolls into specification and be thick-walled seamless steel pipes among 212.0 * 35 the X90Q.
Then, carry out modified thermal treatment.Specifically, thick-walled seamless steel pipes carries out modified thermal treatment at continous way walking-beam furnace production line among the X90Q, and quenching temperature is 940 ℃, and quench cooled is used shrend, and the spray+interior axial flow type of cooling outside quenching device adopts is simultaneously without the pressure roller device; Begin the outer interior axial flow that sprays, begins again during cooling earlier; Close outer spray and interior axial flow during end simultaneously.Outer spray time 97 seconds, 96 seconds interior axial flow time.Outer water spray 3000m 3/ h, interior axial flow water yield 1900m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and the tempering Heating temperature is 550 ℃, air cooling after the tempering.Mechanical property sees Table 2 after the steel pipe thermal treatment.
Example 3
Adopt with example 1 in the smelting step, i.e. Electric furnace steel making, LF(ladle refining furnace) refining, VD(vacuum outgas) step such as processing, obtain the steel grades as sample in the following table 13.
Then, above-mentioned molten steel composition is carried out continuous casting.Specifically, the continuous casting process is protected cast; The weak cold mode of two cold employings is poured into a mould; Strand adopts slow cooling (cheating cold), goes into to cheat temperature 〉=500 ℃, and strand goes out to cheat temperature≤100 ℃.
Next, the strand that continuous casting is obtained carries out hot rolling.Specifically, adopt 350 bases, guarantee ratio of forging reduction 〉=3, guarantee good thermal pretreatment tissue; Roll in 508 all milling train group weeks, ring furnace goes out 1250 ℃ of boiler tube temperature, through perforation, tube rolling, take off pipe and sizing, rolls into specification and be thick-walled seamless steel pipes among 212.0 * 35 the X90Q.
Then, carry out modified thermal treatment.Specifically, thick-walled seamless steel pipes carries out modified thermal treatment at continous way walking-beam furnace production line among the X90Q, and quenching temperature is 950 ℃, and quench cooled is used shrend, and the spray+interior axial flow type of cooling outside quenching device adopts is simultaneously without the pressure roller device; Begin the outer interior axial flow that sprays, begins again during cooling earlier; Close outer spray and interior axial flow during end simultaneously.Outer spray time 102 seconds, 100 seconds interior axial flow time.Outer water spray 2550m 3/ h, interior axial flow water yield 1250m 3/ h.Steel pipe carries out tempering after being chilled to room temperature, and the tempering Heating temperature is 505 ℃, air cooling after the tempering.Mechanical property sees Table 2 after the steel pipe thermal treatment.
Table 1 shows the chemical ingredients of thick-walled seamless steel pipes among the X90Q of example 1, example 2 and example 3.
Table 2 shows the mechanical property of thick-walled seamless steel pipes among the X90Q of example 1, example 2 and example 3.Wherein, head and the afterbody to sample 1 to 3 all carried out sampling analysis.
The chemical ingredients (wt% of unit) of thick-walled seamless steel pipes among the table 1X90Q
Figure BDA00003356360600071
The mechanical property of thick-walled seamless steel pipes among the table 2X90Q
Figure BDA00003356360600072
As can be seen from Table 2, the relevant mechanical property of the X90Q weldless steel tube that obtains of method of the present invention all meets in the API Spec5L standard requirement to X90Q PSL2.
In sum, the present invention is by the combination control to steel grades and thermal treatment process, can make thick-walled seamless steel pipes among the X90Q that wall thickness is 20~40mm, for example, among the X90Q mechanical property of thick-walled seamless steel pipes can for: yield strength is not less than 635MPa, tensile strength is not less than 720MPa, and elongation is not less than 20%, and ballistic work is not less than 140J.And the present invention can also reduce cost.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, under the situation of the spirit and scope that do not break away from claim, can carry out various modifications to above-described embodiment.

Claims (9)

1. the production method of thick-walled seamless steel pipes among the X90Q is characterized in that described production method may further comprise the steps:
Smelting is to form the target molten steel, the composition of described target molten steel is C:0.11~0.15%, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06% by weight percentage, surplus is Fe and inevitable impurity, and in the described target molten steel content sum of Nb, V, Ti be not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24;
Continuous casting and rolling is the weldless steel tube of 20~40mm to form wall thickness;
Be that the weldless steel tube of 20~40mm quenches and adds tempering and handle to described wall thickness, wherein, quenching temperature is 890~950 ℃, the mode shrend of adopting outer spray to add interior axial flow is cooled to room temperature, and carry out outer spray earlier and carry out interior axial flow then, finish outer spray and interior axial flow when stopping simultaneously, carry out temper then, the tempering Heating temperature is 500~560 ℃, air cooling after the tempering.
2. the production method of thick-walled seamless steel pipes among the X90Q according to claim 1, it is characterized in that, the composition of described target molten steel is C:0.125~0.145% by weight percentage, Si:0.20~0.35%, Mn:1.45~1.55%, P:0~0.018%, S:0~0.008%, Al:0.030~0.040%, Nb:0.035~0.045%, N:0~0.008%, B:0.0010~0.0015%, Cu≤0.10%, V≤0.04%, Ti≤0.03%, surplus is Fe and inevitable impurity, and, Nb in the described target molten steel, V, the content sum of Ti is in 0.05%~0.13% scope, CE IIWIn 0.28~0.40 scope, CE PcmIn 0.10~0.20 scope.
3. the production method of thick-walled seamless steel pipes among the X90Q according to claim 1 is characterized in that, described quenching temperature is 905~940 ℃.
4. the production method of thick-walled seamless steel pipes among the X90Q according to claim 1 is characterized in that, in described quenching step, outer water spray is controlled to be 2500~3100m 3/ h is controlled to be 1200~2000m with the interior axial flow water yield 3/ h.
5. the production method of thick-walled seamless steel pipes among the X90Q according to claim 1 is characterized in that, in described quenching step, outer spray time is controlled to be 60~120 seconds, and the interior axial flow time is controlled to be 60~120 seconds.
6. thick-walled seamless steel pipes among the X90Q according to claim 1 is characterized in that, the wall thickness of thick-walled seamless steel pipes is 25~30mm among the described X90Q.
7. thick-walled seamless steel pipes among the X90Q, it is characterized in that, the composition of thick-walled seamless steel pipes is C:0.11~0.15%, Si:0.17~0.37%, Mn:1.40~1.60%, P:0~0.018%, S:0~0.008%, Al:0.020~0.050%, Nb:0.03~0.05%, N:0~0.010%, B:0.0008~0.0018%, Cu≤0.20%, V≤0.10%, Ti≤0.06% by weight percentage among the described X90Q, surplus is Fe and inevitable impurity, and among the described X90Q in the thick-walled seamless steel pipes content sum of Nb, V, Ti be not more than 0.15%, CE IIW≤ 0.43, CE Pcm≤ 0.24.
8. thick-walled seamless steel pipes among the X90Q according to claim 7, it is characterized in that, the composition of thick-walled seamless steel pipes is C:0.125~0.145% by weight percentage among the described X90Q, Si:0.20~0.35%, Mn:1.45~1.55%, P:0~0.018%, S:0~0.008%, Al:0.030~0.040%, Nb:0.035~0.045%, N:0~0.008%, B:0.0010~0.0015%, Cu≤0.10%, V≤0.04%, Ti≤0.03%, surplus is Fe and inevitable impurity, and, Nb in the thick-walled seamless steel pipes among the described X90Q, V, the content sum of Ti is in 0.05%~0.13% scope, CE IIWIn 0.28~0.40 scope, CE PcmIn 0.10~0.20 scope.
9. thick-walled seamless steel pipes among the X90Q according to claim 7 is characterized in that, the wall thickness of thick-walled seamless steel pipes is 20~40mm among the described X90Q.
CN2013102391791A 2013-06-17 2013-06-17 X90Q medium thick-wall seamless steel tube and method for manufacturing same Pending CN103290189A (en)

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CN110004363A (en) * 2019-04-04 2019-07-12 靖江特殊钢有限公司 A kind of wear-resisting seamless steel pipe and its manufacturing method
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Application publication date: 20130911