CN100435988C - Method for manufacturing seamless steel pipe or tube - Google Patents
Method for manufacturing seamless steel pipe or tube Download PDFInfo
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- CN100435988C CN100435988C CNB2005800172469A CN200580017246A CN100435988C CN 100435988 C CN100435988 C CN 100435988C CN B2005800172469 A CNB2005800172469 A CN B2005800172469A CN 200580017246 A CN200580017246 A CN 200580017246A CN 100435988 C CN100435988 C CN 100435988C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 78
- 238000002791 soaking Methods 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims description 58
- 238000010438 heat treatment Methods 0.000 claims description 31
- 239000000203 mixture Substances 0.000 claims description 26
- 230000003746 surface roughness Effects 0.000 claims description 15
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 239000000470 constituent Substances 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 36
- 230000002950 deficient Effects 0.000 description 32
- 239000000126 substance Substances 0.000 description 21
- 239000002994 raw material Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
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- 229910000859 α-Fe Inorganic materials 0.000 description 4
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- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
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- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 230000002650 habitual effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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Abstract
A round billet comprising 10.50 to 14.00% by mass of Cr and satisfying a value of not more than 9.0% as determined by a formula [Cr + 4Si - (22C + 0.5Mn + 1.5Ni + 30N)] wherein the symbol of element represents the content (% by mass) of each constituent element in the steel is heated under conditions of a soaking temperature of 1100 to 1250 DEG C and an in-furnace time (min) of not less than ''0.5 x diameter of round billet (mm)''. Thereafter, piercing and rolling are carried out under conditions of a piercer piercing efficiency of not less than 50%, a value of not more than 8.0 as specified by ''{(diameter of round billet - roll spacing at foremost end of plug)/diameter of round billet} x 100'', and a plug shape of 0.06 to 0.17 as defined by {radius of foremost end of plug (mm)/diameter of round billet (mm)}''. The high Cr seamless steel pipe thus obtained has no significant internal flaw, that is, has excellent internal properties.
Description
Technical field
The present invention relates to a kind of manufacture method of seamless steel pipe.In detail, relate to a kind of manufacture method that mass percent is the high Cr seamless steel pipe of 10.50～14.00% Cr that contains, it makes the generation of above-mentioned seamless steel pipe defect in inner surface less and can make the method for seamless steel pipe expeditiously.
Background technology
As oil well with or gas well with, various plant equipment with or the steel pipe used of building structure, adopt contained the high Cr seamless steel pipe that mass percent is 10.50～14.00% Cr more.
But the drilling/rolling of nearest high Cr seamless steel pipe adopts the drilling/rolling mode of rotary piercing machine (below be also referred to as " punch ") more.Specifically, solid raw material (being designated hereinafter simply as " round steel billet " or " steel billet ") with circular cross-section, by punch from making hollow bloom, roll and after reducing the wall thickness of this hollow bloom, dwindle its external diameter with pull-out and reducing stands such as mandrel rolling mill, plug mill, A Saier milling train, push benches with precision mills such as stretching undergauge milling train or sizing mills.
Yet,,, produce defective at internal surface of bloom easily so carried out with punch under the situation of drilling/rolling because the hot-working character of high Cr steel is lower than the hot-working character of so-called " ordinary steel ".Representative as the defective of this internal surface of bloom has the defective that is called as " internal fracture defective (internal fracture flaw (s)) ", and the defective that is called as " inner surface squamous fold defect " or " skin lamination defect " is also arranged.
In addition, the defect in inner surface of steel pipe is divided into the defect in inner surface of steel billet itself and/or the caused defective of hot-workability, i.e. " material cause defective " and be used for the perforating head of tubulation or caused defective such as the blemish of inner surface instrument such as push rod and/or tubulation condition, i.e. " mechanical cause defective " substantially.According to this classification, the former " material cause defective " mainly is the defective that produces in the stage at drilling/rolling, and wherein, the internal fracture defective is main defective.
In order to remove the steel pipe internal-surface defective, the steel pipe behind other operation maintenance tubulation or cut off defective part and remove defective etc. and need a lot of man-hours is so production efficiency significantly reduces.And, under the darker situation of defective, must discard steel pipe itself and yield rate is reduced.
Therefore, patent documentation 1～6 has proposed such technology: this technology is used for suppressing the directly generation of defect in inner surface relevant with the defect in inner surface of steel pipe, the drilling/rolling stage.
Such technology is disclosed in patent documentation 1: by with the impurity element in the steel, be that the content of P and S suppresses very lowly, improve the hot-workability of raw material, thus the internal fracture defective when suppressing because of the punch drilling/rolling.
Such technology is disclosed in patent documentation 2: by reducing the heating-up temperature as the steel billet of raw material, and the average deformation speed when making because of the punch drilling/rolling diminishes, the temperature that suppresses to follow the processing heating and produce rises, thereby suppress δ-ferritic generation, prevent the internal fracture generation of defects thus.
The martensite method of manufacturing seamless steel pipe is disclosed in patent documentation 3: by stipulating the content of specific alloy element component, and management is annealed heat time heating time, and to make the perforation heating-up temperature be low temperature below 1200 ℃, thus the tissue when improving hot-working.
Such technology is disclosed in patent documentation 4: when carrying out drilling/rolling with the punch with dish type roll type guide block, to the raw material diameter, clamp the starting position to the distance of top till the front end from the raw material on the cross roll, guide block in the front position of top at interval, cross roll interval in the wall thickness decision position is adjusted at interval with the guide block in the above-mentioned position, thereby carries out drilling/rolling.
The manufacture method of so high Cr class seamless steel pipe is disclosed in patent documentation 5: the content by regulation Cr, as the content of the element that adds in the content of the S of impurity element and P and the high Cr steel, and the heat time heating time when adjusting the casting sheet or the soaking time of steel disc, the soaking time of rolling raw material and tubulation, tissue when improving hot-working prevents the generation of defect in inner surface.
The manufacture method of such martensitic stainless steel seamless steel pipe is disclosed in patent documentation 6: by stipulating the content of specific alloying component, and the angle of cut and inclination angle when adjusting drilling/rolling, tissue when improving hot-working prevents the generation of defect in inner surface.
Patent documentation 1: Japanese kokai publication sho 59-208055 communique
Patent documentation 2: Japanese kokai publication sho 63-281705 communique
Patent documentation 3: Japanese kokai publication hei 4-224659 communique
Patent documentation 4: Japanese kokai publication hei 5-69011 communique
Patent documentation 5: TOHKEMY 2003-3212 communique
Patent documentation 6: TOHKEMY 2004-43935 communique
Summary of the invention
Even used the technology that above-mentioned patent documentation 1～6 is proposed, when manufacturing contains the high Cr seamless steel pipe of 10.50～14.00%Cr, also not necessarily restrain the generation of the defect in inner surface of drilling/rolling in the stage.
That is, the technology that proposes in the above-mentioned patent documentation 1 is not stipulated the drilling/rolling condition of any punch, therefore, even under the situation of using the low raw material of P and S content, also may not restrain the internal fracture generation of defects.
In the technology that patent documentation 2 is proposed, though stipulated the drilling/rolling condition of punch,, therefore average deformation speed diminished because its purpose only is to suppress δ-ferrite to generate, therefore identical with the situation of above-mentioned patent documentation 1, must restrain the internal fracture generation of defects.
In the technology that proposes in patent documentation 3, the rolling process of seamless steel pipe is recited as " as long as adopting conventional process ", does not stipulate the condition of the drilling/rolling of punch.Therefore, can not avoid the internal fracture generation of defects sometimes.
In the technology that in patent documentation 4, proposes, only stipulated above-mentioned content as the drilling/rolling condition of punch, so may not necessarily restrain the internal fracture generation of defects.
The situation of the technology that patent documentation 5 is proposed also is that identical with the situation of patent documentation 3, the rolling process of seamless steel pipe is recited as so long as " manufacturing process of habitual seamless steel pipe " gets final product, and does not stipulate the drilling/rolling condition of punch.Therefore, can not avoid the internal fracture generation of defects sometimes.
The technology that patent documentation 6 is proposed also is, only stipulated the angle of cut and inclination angle as the condition of the drilling/rolling of punch, so may not restrain the internal fracture generation of defects.
Therefore, in order to solve above-mentioned such problem, the inventor has observed the internal fracture defective of the reality that produces in the high Cr steel pipe in detail, and probe with the causality of imposing a condition of the heating condition of round steel billet and drilling/rolling etc.
Found that: the internal fracture defective also may not necessarily be distinguished material cause and mechanical cause sometimes as in the past clearly.That is, learn: the internal fracture generation of defects is material cause just, also with punch in have influence on one of factor of rotary squeeze effect, promptly " piercing efficiency " closely related.
The present invention makes in view of above-mentioned content, its purpose is to provide a kind of manufacture method of high Cr seamless steel pipe, but the internal fracture generation of defects in the defect in inner surface that its rejection iris machine produces when drilling/rolling provides a kind of manufacture method that mass percent is the high Cr seamless steel pipe of 10.50～14.00%Cr that contains especially.
The manufacture method that will be intended to the high Cr seamless steel pipe of following (1) and (2) of the present invention.
(1) a kind of manufacture method of high Cr seamless steel pipe, it carries out drilling/rolling with the rotary piercing machine to it after heating round steel billet with heating furnace, it is characterized in that,
It is 10.50～14.00% Cr that above-mentioned round steel billet contains mass percent, and the represented Cr of following formula (1)
*Value be below 9.0%;
Above-mentioned heating furnace is set for: the time inside furnace that soaking temperature is 1100～1250 ℃, put into the heating furnace to till taking out from round steel billet satisfies following formula (2);
The roll surface roughness Rz of above-mentioned rotary piercing machine
JISBe 50～200 μ m, the represented top front end draw ratio of following formula (3) is below 8.0%.
Cr
＊＝Cr+4Si-(22C+0.5Mn+1.5Ni+30N)......(1)
Time inside furnace (minute) 〉=0.5 * round steel billet diameter (mm) ... (2)
Top front end draw ratio (%)={ (round steel billet diameter (mm)-come directly towards is the roller (mm) at interval at portion place foremost)/round steel billet diameter (mm) } * 100...... (3)
In addition, the symbol of element in the formula (1) is represented each composition content by percentage to the quality in the steel.
According to the manufacture method of each described high Cr seamless steel pipe in above-mentioned (1), it is characterized in that (2) the top shape value of the following formula of the usefulness of employed top (4) expression is 0.06～0.17 during drilling/rolling.
Top shape value=come directly towards portion's radius (mm)/round steel billet diameter (mm) foremost ... (4)
In addition, " the Rz of roll surface roughness
JIS" be meant " 10 mean roughness " perpendicular to the JIS B on the roll axis direction 0601 (2001).
Below, the invention with the manufacture method of the high Cr seamless steel pipe of above-mentioned (1) and (2) is called " the present invention (1) ", " the present invention (2) " respectively.In addition, they are generically and collectively referred to as " the present invention ".
Adopt method of the present invention, when making high Cr seamless steel pipe, the internal fracture generation of defects in the defect in inner surface that produces during drilling/rolling that can the rejection iris machine.
The specific embodiment
In order to solve the above problems, the internal fracture generation of defects situation of one of defect in inner surface that the inventor at first produces to as the drilling/rolling of punch the time has been carried out various investigation.
The result learns: suppress δ-ferritic generation; Especially shown in following (a)～(d), suppress δ-ferritic generation by the drilling/rolling condition of adjusting punch like that, the chemical composition of steel billet and equal heat condition are rationalized; By reducing rotary squeeze number of times, can especially suppress the internal fracture generation of defects as the drilling/rolling condition of punch.
(a) contain 10.50～14.00% Cr by the chemical composition that makes steel billet, and make the represented Cr of above-mentioned (1) formula
*Value be below 9.0%, can reduce δ-ferritic generation, and the internal fracture generation of defects that generates during drilling/rolling that can the rejection iris machine.
(b) before the punch drilling/rolling, if use heating furnace at 1100～1250 ℃ of steel billets that heat above-mentioned chemical composition down of soaking temperature, make time inside furnace satisfy above-mentioned (2) formula, then since all thermal effect can suppress δ-ferritic generation, the internal fracture generation of defects that is generated during drilling/rolling that therefore can the rejection iris machine.
(c) because the represented rotary squeeze times N of aftermentioned (5) formula reduces the generation of the internal fracture defective that produces during drilling/rolling that therefore can the rejection iris machine.
N=(2L * Brps)/{ (circumferential speed of roller concave part * sin β * piercing efficiency)/piercing ratio ... (5)
In above-mentioned formula (5),
L: nip the position to the distance that comes directly towards front end from steel billet
Brps: the revolution of steel billet, i.e. " at the nip girth of rotary speed composition/steel billet of locational roller circumferential speed of steel billet "
Piercing ratio: " hollow bloom length/steel billet length "
In the above-mentioned formula (5), above-mentioned " β " be the roller inclination angle (°), so-called " piercing efficiency " is meant the efficient of advancing (%) of rolling direction of punch.
(d) by " L " value in the above-mentioned formula being reduced or the piercing efficiency value being increased, realize the reduction of the rotary squeeze number of steel billet.And, reduce in order to make " L " value, " top front end draw ratio " be below 8.0% for well, on the other hand, making " piercing efficiency " is for well more than 50%.In addition, also consider to increase roller declination angle " β ", but this method causes steel billet bad to nipping of roll sometimes.
Therefore, investigated the condition of " piercing efficiency " when raising is carried out drilling/rolling with punch in more detail.Its result has obtained following (e) and (f) scheme.
(e) as using surface roughness Rz
JISThe roller that is 50～200 μ m carries out drilling/rolling, then further improves " piercing efficiency ".As mentioned above, roll surface roughness " Rz
JIS" be meant " 10 mean roughness " perpendicular to the JIS B on the direction of roll mandrel 0601 (2001).
(f) even using the represented top shape value of above-mentioned (4) formula is that drilling/rolling is carried out in the top of 0.06～0.17 tipization, also can improve " piercing efficiency ".
Above-mentioned the present invention (1) and (2) are based on such scheme and finish.
Below, describe each key element of the present invention in detail.In addition, " % " of the content of illustrated various elements is meant " mass percent " below
(A) chemical composition of steel
The round steel billet that becomes the raw material of high Cr seamless steel pipe of the present invention is necessary to become the high Cr steel of following chemical composition: contain 10.50～14.00% Cr, and the represented Cr of above-mentioned (1) formula
*Value is below 9.0%.
Cr：10.50～14.00％
Cr is the necessary composition element that is used to improve corrosion resistance, when it contains quantity not sufficient 10.50%, can not guarantee desired anti-spot corrosion and crevice corrosion performance, and carbon dioxide environment under corrosion resistance.On the other hand, because Cr is ferritic forming element, so when its content surpasses 14.00%, generation δ-ferrite and damage hot-working character easily when high temperature process.In addition, excessively adding Cr can cause manufacturing cost to rise.Thereby making Cr content is 10.50～14.00%.The preferred scope of Cr content is 11.00～13.10%.
Cr
*Value: below 9.0%
Even under the content of Cr is above-mentioned 10.50～14.00% situations, as the represented Cr of above-mentioned formula (1)
*Value surpass at 9.0% o'clock, becoming generates δ-ferrite easily and reduces sulfide stress cracking resistance energy and hot-workability.Thereby, make the Cr that represents in the formula (1)
*Value be below 9.0%.
For the above reasons, in the present invention, will make contain Cr amount be 10.50～14.00% and above-mentioned formula (1) in the Cr of expression
*Value be that the high Cr steel of the chemical composition below 9.0% is as becoming the round steel billet that carries out the raw material of drilling/rolling with punch.
Become a chemical composition regulation Cr content and the middle Cr that represents of above-mentioned formula (1) of the round steel billet of high Cr seamless steel pipe raw material of the present invention
*Value get final product.
In addition, as preferable chemical composition, for example can enumerate represent with above-mentioned (1) formula, Cr
*Value is the high Cr steel below 9%: contain 0.15～0.22% C, 0.1～1.0% Si, 0.10～1.00% Mn, 12.00～14.00% Cr, P below 0.020%, S below 0.010%, N below 0.05%, O below 0.0060% (oxygen), and contain V from 0.005～0.200%, Nb, the composition of selecting among Ti and 0.0005～0.0100% the B more than a kind (if but the situation more than 2 kinds, just add up to 0.005～0.200%), contain 0～0.1% Al, 0～0.5% Ni, 0～0.25% Cu and 0～0.0050% Ca, all the other are made up of Fe and impurity.
In addition, as another preferred chemical composition, for example can also enumerate represent with above-mentioned (1) formula, Cr
*Value is the high Cr steel below 9%: contain 0.003～0.050% C, 0.05～1.0% Si, 0.10～1.50% Mn, 10.50～14.00% Cr, the P below 0.035%, the S below 0.010%, the N below 0.070%:, the O below 0.0060% (oxygen), the V below 0～0.200%:, 0～0.300% Ti, 0.2～3.0% Mo, 0～7.0% Ni and 0～0.580% Zr, all the other are made up of Fe and impurity.
(B) heating condition of round steel billet
In the present invention, be necessary under 1100～1250 ℃ soaking temperature, to have round steel billet above-mentioned chemical composition, that become the raw material of high Cr seamless steel pipe, and make time inside furnace satisfy above-mentioned formula (2) with the heating furnace heating.
Be lower than in soaking temperature under 1100 ℃ the situation, because the rolling temperature step-down the when rolling temperature when carrying out drilling/rolling with punch or mandrel rolling mill, plug mill etc. carry out drawing/rolling, it is big that the deformation drag of rolled parts becomes, so the rolling instability that becomes is easy to generate the scaling loss defective.
When soaking temperature surpasses 1250 ℃, owing to produce δ-ferrite and growth, so be easy to generate the internal fracture defective.
Even soaking temperature is 1100～1250 ℃, when the time inside furnace of the round steel billet in the heating furnace did not satisfy above-mentioned formula (2), the central part of round steel billet is fully soaking and be difficult to stably carry out drilling/rolling with punch.Its result is difficult to realize that the setting by punch is rolled, variation such as uneven thickness rate.
Thereby in the present invention, the round steel billet to the raw material that becomes the drilling/rolling that punch carries out under 1100～1250 ℃ soaking temperature heats, and makes round steel billet satisfy above-mentioned formula (2) from entering into the time inside furnace of heating furnace till come out of the stove.
In addition, in order to prevent to reduce because of scaling loss makes the mill product rate, the time inside furnace in above-mentioned heating furnace is not enough " 1.5 * round steel billet diameter (mm) " minute preferably.
(C) drilling/rolling of usefulness punch
In the present invention, under above-mentioned (B) described condition,, be necessary to make that to come directly towards the front end draw ratio be 8.0% to carry out drilling/rolling to get off in the operation after the round steel billet heating of the raw material that becomes high Cr seamless steel pipe with the chemical composition described in above-mentioned (A).
When top front end draw ratio surpasses 8.0%, just mean " L " value in the above-mentioned formula (5), promptly big to the geometric distance that comes directly towards front end from the round steel billet position of nipping.And, because counting N, the represented rotary squeeze of above-mentioned formula (5) this moment becomes big, thus produce so-called " Mannesmann's destruction " superfluously, and be easy to generate the internal fracture defective.The lower limit of top front end draw ratio is that steel billet bites into about 3.0% in the piercer roll geometrically.
In addition, be lower than at the piercing efficiency of punch under 50% the situation, count N with the rotary squeeze of above-mentioned formula (5) expression and become big, produce so-called " Mannesmann's destruction " too much, and be easy to generate the internal fracture defective.From experience, the upper limit of the piercing efficiency of punch be when the angle of cut is 0 ° roller roll, be 60～70% about, when the angle of the crossing is 5～30 ° tapered roller, be 80～90% about.
When using surface roughness Rz
JISBe the above roller of 50 μ m when carrying out drilling/rolling, owing to the rolled parts of hollow bloom and roller, produce suitable frictional force at the steel billet from drilling/rolling, so can improve piercing efficiency.But, at surface roughness Rz
JISSurpass under the situation of 200 μ m, the surface state that roller takes place sometimes is transferred to the outer surface of hollow bloom, and the outer surface proterties of final products degenerates.
Therefore, preferably use roll surface roughness Rz
JISThe punch that is 50～200 μ m carries out drilling/rolling.
Thereby, in above-mentioned the present invention (1), in the operation after under above-mentioned (B) described condition, the round steel billet that becomes the high Cr seamless steel pipe raw material with the chemical composition described in above-mentioned (A) being heated, use roll surface roughness Rz
JISBe the punch of 50～200 μ m, making top front end draw ratio is to carry out drilling/rolling below 8.0%.
Preferably come directly towards the front end draw ratio on be limited to about 6.0%.
In addition, for example, make surperficial roughening by being rolled, thereby can obtain surface roughness Rz with usual way pair roller enforcement Surface Machining or to so-called " ordinary steel "
JISIt is the roll of 50～200 μ m.As mentioned above, " the Rz of roll surface roughness
JIS" be meant " 10 mean roughness " perpendicular to the JIS B on the roll axis direction 0601 (2001).
Since use above-mentioned formula (4) represented, top shape value be 0.06～0.17, the tip change the top carry out drilling/rolling, also can improve " piercing efficiency ", so can suppress the internal fracture generation of defects more expeditiously.In addition, top shape value less than 0.06 situation under, the top shape becomes tip, might produce melting loss because of heating.In addition, top shape value greater than 0.17 situation under, might produce nip bad.
Thereby in above-mentioned (2) of the present invention, top shape value employed top, the middle expression of above-mentioned formula (4) is 0.06～0.17 when drilling/rolling.
Below, further describe the present invention with embodiment, but the present invention is not limited by following embodiment, in being fit to the scope of aforementioned, aim described later, can suitably implement change, these changes also are included in the technical scope of the present invention.
Embodiment 1
It is rolling with usual way the bloom with the chemical composition shown in the table 1 to be carried out piecemeal, makes the round steel billet that diameter is 225mm.In addition, steel A1 in the table 1 and B1 are the steel of of the present invention example of chemical composition in the scope of the present invention's regulation.On the other hand, the Cr of steel A2
*Cr with steel B2
*Content is the steel outside scope given to this invention all.
(table 1)
Secondly, after the round steel billet of the size of above-mentioned various steel is encased in heating furnace, heat under the conditions shown in Table 2, and make piercing efficiency and top front end draw ratio be respectively 52% and 7.7%, carrying out drilling/rolling by usual way with punch, is that 230mm, wall thickness are the pipe of 20mm thereby produce external diameter.In addition, the time inside furnace of expression is necessary for more than " 0.5 * 225 (mm) " minute, promptly is necessary for more than 112.5 minutes in the above-mentioned formula (2).
(table 2)
With ultrasonic examination with observing the defective of examining the various internal surface of bloom of checking such acquisition.That is, at first determine the generation position and the marking of defect in inner surface, cut off this position then, estimate with visual examination with ultrasonic examination.In addition, by examining rolling bad generations such as investigating uneven thickness with ultrasonic examination with observing.
The proterties investigation result of expression pipe in table 3.In addition, in table 3, " zero " and " * " represent that respectively the internal fracture defective generation rate of internal surface of bloom is a less than 10% and more than or equal to 10%.At this, internal fracture generation of defects rate is that the ratio of radical that has produced the steel pipe of internal fracture defective in respondent's steel pipe is estimated as generation rate.
(table 3)
Learn from table 3: have the round steel billet of the steel A1 of chemical composition given to this invention and steel B1 by 1～4 heating of heating condition given to this invention numbering after, make piercing efficiency and top front end draw ratio be respectively 52% and 7.7% and to carry out the inner surface proterties of the pipe that drilling/rolling goes out with punch good.It is rolling bad also not find to produce on each above-mentioned pipe uneven thickness etc.In addition, under the situation of heating condition numbering 1～4, time inside furnace less than 337.5 minutes does not have to produce the scaling loss that causes yield rate to reduce.
To this, under the situation of the round steel billet that uses steel A2 outside the specified chemical composition of the present invention and steel B2,, many internal fracture defectives still in its pipe, have been produced even the perforation condition in heating condition and the punch meets condition given to this invention.
Reference example 1
Under 1200 ℃ soaking temperature, be that the round steel billet of 225mm heats to the diameter of the steel A1 that produces in the foregoing description 1, and to make time inside furnace be 180 minutes, carry out drilling/rolling with piercing efficiency shown in the table 4 and top front end draw ratio with punch then, having produced external diameter is that 230mm, wall thickness are the pipe of 20mm.In addition, be under 2.8% the situation, can not carry out drilling/rolling in the top front end draw ratio of the perforation condition of table 4 numbering 4,8 and 12 owing to nip bad.
(table 4)
Each pipe to the perforation condition numbering 1～3,5～7 and 9～11 of the table 4 of such acquisition has investigated whether produce the internal fracture defective.That is, identical with the situation of embodiment 1, at first determine the generation position and the marking of defect in inner surface with ultrasonic examination, cut off this position then and check, and estimate with observing to examine.And, by having investigated rolling bad generations such as uneven thickness with observing to examine with ultrasonic examination.
In table 4, list the proterties investigation result of expression pipe.In addition, in table 4, " zero " and " * " represent that respectively the internal fracture defective generation rate of internal surface of bloom is a less than 10% and more than or equal to 10%.In addition, "-" is that expression badly can not be carried out drilling/rolling because of nipping, so situation about not investigating.
From table 4, learn: after by predetermined heating condition of the present invention the round steel billet of steel A1 with chemical composition given to this invention being heated, with piercing efficiency be 52% or 75%, top front end draw ratio is that 7.7% or 5.8% condition (that is the numbering of perforation condition, 6,7,10 and 11) is carried out drilling/rolling and the inner surface proterties of the pipe that obtains is good.In addition, less than rolling bad generations such as discovery uneven thickness on each above-mentioned pipe.
To this, even situation about the round steel billet of the steel A1 of chemical composition given to this invention being heated by heating condition given to this invention under the situation of perforation condition numbering 1～3,5 and 9, has produced a lot of internal fracture defectives in pipe.In addition, as mentioned above, be that because it is bad to nip, so drilling/rolling itself can't carry out under 2.8% the situation in the top front end draw ratio of perforation condition numbering 4,8 and 12.
Embodiment 2
Under 1200 ℃ soaking temperature, be that the round steel billet of 225mm heats to the diameter of the steel A1 that produces in the foregoing description 1, and to make time inside furnace be 150 minutes, make the surface roughness Rz of the roll of punch then
JISBecoming 45～210 μ m and carry out drilling/rolling, is that 230mm, wall thickness are the pipe of 20mm thereby produced external diameter.In addition, for the roughness condition numbering of each roller of table 5, the top front end draw ratio during with the drilling/rolling of punch is 5.6%.
(table 5)
Each pipe that is obtained has been investigated its inner surface proterties.That is, identical with the situation of embodiment 1, at first determine the generation position and the marking of defect in inner surface with ultrasonic examination, cut off this position then and check, and estimate with observing to examine.And, also by having investigated rolling bad generations such as the generation situation of external defects and uneven thickness with ultrasonic examination with observing to examine.
In table 5, list the inner surface proterties investigation result of expression pipe.In addition, in table 5, " ☆ ", " ◎ " and " zero " represents the internal fracture generation of defects rate less than 3% of internal surface of bloom respectively, more than or equal to 3% and less than 5% and more than or equal to 5% and less than 10% situation.
From table 5, learn: after with heating condition given to this invention the round steel billet of steel A1 with chemical composition given to this invention being heated, using roll surface roughness Rz
JISBe that the punch of 50～200 μ m carries out under the situation of the pipe that drilling/rolling obtains, its inner surface proterties is better.
In addition, less than rolling bad generations such as discovery uneven thickness on each above-mentioned pipe.But the roll surface roughness condition is under numbering 1 the situation, has because of slip to produce rolling condition of poor.In addition, under the situation of roll surface roughness condition,, the roller surface state produces external defects owing to being transferred to outer surface of steel tube for numbering 6.
Be that because the smaller volume of top leading section, thermal capacity also diminishes, so exist the top by the situation of melting loss under 0.05 the situation in the top of table 5 shape value.In addition, be under 0.18 the situation,, to produce the condition of poor of nipping in top shape value so exist because its leading section shape approaches the obtuse angle.
As learning from table 5, if after using predetermined heating condition among the present invention that the round steel billet of the steel A1 of chemical composition with defined among the present invention is heated, piercing efficiency is more than 50%, top front end draw ratio is that condition below 8.0% is when carrying out drilling/rolling, use top shape value is 0.06～0.17 top, and then the inner surface proterties of pipe becomes better.In addition, the present invention's (2) method, promptly when carrying out drilling/rolling with the condition of the present invention (1) defined is 0.06～0.17 top if use top shape value, and then the inner surface proterties of pipe becomes better.It is bad all find to produce rolling tube rolling such as uneven thickness.
The industry utilizability
Adopt manufacture method of the present invention, can make few that its defect in inner surface produces High Cr seamless steel pipe. And, do not need its assorted as the chemical composition of steel of excessive minimizing Matter, in addition, owing to the productivity ratio that can when tubulation, guarantee to stipulate, so can be efficient The good high Cr seamless steel pipe of inner surface proterties is made on rate ground.
Table 1
Table 2
Table 3
Table 4
Claims (2)
1. the manufacture method of a high Cr seamless steel pipe, it carries out drilling/rolling with the round steel billet of rotary piercing machine after to this heating after with heating furnace heating round steel billet, it is characterized in that,
It is 10.50～14.00% Cr that above-mentioned round steel billet contains mass percent, and the represented Cr of following formula (1)
*Value be below 9.0%;
Above-mentioned heating furnace is set to: under 1100～1250 ℃ soaking temperature, enter into the time inside furnace of heating furnace till come out of the stove from round steel billet and satisfy following formula (2);
The roll surface roughness Rz of above-mentioned rotary piercing machine
JISBe 50～200 μ m, the represented top front end draw ratio of following formula (3) is below 8.0%;
Cr
＊＝Cr+4Si-(22C+0.5Mn+1.5Ni+30N)…(1)
Time inside furnace (minute) 〉=0.5 * round steel billet diameter (mm) ... (2)
Top front end draw ratio (%)={ (round steel billet diameter (mm)-come directly towards is the roller (mm) at interval at portion place foremost)/round steel billet diameter (mm) } * 100 ... (3)
The symbol of element in this formula (1) is represented the content by percentage to the quality of each composition element in the steel.
2. the manufacture method of seamless steel pipe according to claim 1 is characterized in that,
The represented top shape value of formula employed top, following (4) is 0.06～0.17 during drilling/rolling,
Top shape value=come directly towards portion's radius (mm)/round steel billet diameter (mm) foremost ... (4).
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| JP2004159600 | 2004-05-28 | ||
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361304A (en) * | 2001-06-11 | 2002-12-17 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless steel tube using round billet |
| WO2003000938A1 (en) * | 2001-06-21 | 2003-01-03 | Sumitomo Metal Industries, Ltd. | Method of producing high cr-based seamless steel tube |
| JP2003001305A (en) * | 2001-06-13 | 2003-01-07 | Sumitomo Metal Ind Ltd | Production method for seamless steel pipe |
| WO2004007780A1 (en) * | 2002-07-15 | 2004-01-22 | Sumitomo Metal Industries, Ltd. | Martensitic stainless steel seamless pipe and a manufacturing method thereof |
-
2005
- 2005-05-26 CN CNB2005800172469A patent/CN100435988C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361304A (en) * | 2001-06-11 | 2002-12-17 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless steel tube using round billet |
| JP2003001305A (en) * | 2001-06-13 | 2003-01-07 | Sumitomo Metal Ind Ltd | Production method for seamless steel pipe |
| WO2003000938A1 (en) * | 2001-06-21 | 2003-01-03 | Sumitomo Metal Industries, Ltd. | Method of producing high cr-based seamless steel tube |
| WO2004007780A1 (en) * | 2002-07-15 | 2004-01-22 | Sumitomo Metal Industries, Ltd. | Martensitic stainless steel seamless pipe and a manufacturing method thereof |
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