CN1912150A - Steel tube excellent in exfoliating resistance for scale on inner surface of tube - Google Patents
Steel tube excellent in exfoliating resistance for scale on inner surface of tube Download PDFInfo
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- CN1912150A CN1912150A CN 200510091433 CN200510091433A CN1912150A CN 1912150 A CN1912150 A CN 1912150A CN 200510091433 CN200510091433 CN 200510091433 CN 200510091433 A CN200510091433 A CN 200510091433A CN 1912150 A CN1912150 A CN 1912150A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000005482 strain hardening Methods 0.000 claims abstract description 10
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 5
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000008642 heat stress Effects 0.000 abstract 1
- 238000005480 shot peening Methods 0.000 description 28
- 238000002474 experimental method Methods 0.000 description 18
- 230000000694 effects Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 15
- 239000013078 crystal Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 229910052758 niobium Inorganic materials 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000012808 vapor phase Substances 0.000 description 5
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- 230000001419 dependent effect Effects 0.000 description 4
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- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
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- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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- 239000010935 stainless steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
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- 230000003746 surface roughness Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229920003319 Araldite® Polymers 0.000 description 1
- 229910000967 As alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
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- 229910052763 palladium Inorganic materials 0.000 description 1
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Abstract
The invention provides a steel tube with which even when heat stress is received by repeating the heating and the cooling, the scale on the inner surface hardly exfoliates. (1) The steel tube including 9-28 mass% Cr and excellent in the exfoliating resistance for scale on the inner surface of the tube has the peculiarity, in which the maximum height of profile (Rz) on the inner surface after cold-working is >=15 mu m. (2) The steel tube including 9-28 mass% Cr and excellent in the exfoliating resistance for scale in the inner surface has the peculiarity, in which the maximum height of profile (Rz) on the inner surface after cold-working is >=15[mu]m and Delta Hv is >=100. Wherein, Delta Hv is the difference of Vickers hardness between the inner surface layer and the center part of the thickness direction of the tube. The above (1) or (2) steel tube desirably has the structure of ASTM austenite grain size No.7 or more.
Description
Technical field
The present invention relates to the steel pipe of the good internal skin of a kind of anti-separability with scale (scale).
Background technology
In stainless steel tube and other steel alloy heat exchanger pipe, stop and during the thermal shocking that is subjected to being caused by thereafter entry into service once more, its part will be peeled off when running at the steam oxidation scale that generates on the internal surface of pipe.In addition, the scale of having peeled off is cramming and produce the overheated of pipe sometimes, causes bursting accident.
In the solution of the problem of peeling off generation that is accompanied by scale, at first, the growth that suppresses scale is effective.As the means that are used for this purpose, it is effective utilizing plastic working that Cr, Si in the tube material and the increase of Al, the grain refined of crystal grain, shot peening (shot blasting) of tube-surface etc. carry out etc.This is because utilize these countermeasures can suppress steam oxidation.
For the improvement of the water-fast vapor-phase oxidation that utilizes shot peening, the motion of patent documentation 1 and patent documentation 2 is for example arranged.Utilize the effect of the plastic working that this shot peening etc. obtains to be based on following principle.Promptly; when the material that utilizes steel ball etc. to apply plastic working when the internal surface that makes pipe contacts with the pyritous overheated steam; will generate as thin as a wafer on steel uniform surface ground and the speed of growth scale of Cr oxide compound slowly; exist long-term and stably by this scale that is imbued with protectiveness, water-fast vapor-phase oxidation will improve.
Therefore the plastic working of this pipe inner face is widely adopted owing to compare and can implement with lower cost with other method all the time.But,, in addition,, also be difficult to fully to suppress stop and the peeling off of the caused scale of thermal shocking that is subjected to repeatedly of entry into service once more because of running even consider described other countermeasure even adopt this method.
[patent documentation 1] spy opens flat 6-322489 communique
[patent documentation 2] spy opens the 2002-285236 communique
Summary of the invention
The objective of the invention is to, the good steel pipe of anti-separability of scale is provided, more particularly, be subjected to thermal shocking even provide in steam oxidation atmosphere, the scale of internal surface also is difficult to the steel pipe peeled off.
The inventor finds out, suppress by running stop and beginning once more the peeling off of the caused scale of thermal shocking that causes the time, not only the pipe internal surface that pipe is shaped after the processing is implemented plastic workings such as shot peening, and the roughness of its finished surface is controlled at more than the certain value is crucial.In addition, confirmed, in other words, compared firmlyer with the wall thickness central part by the interior surface layers that makes pipe, and by making the grain refined of organizing of tube material, just can further improve the anti-separability of scale by improving the dependent variable of inner face machined layer.
The present invention who finishes based on described opinion is a purport with the steel pipe of following (1)～(3).
(1) a kind of good steel pipe of anti-separability of scale of pipe internal surface is characterized in that, contains the Cr of 9～28 quality %, and the maximum height of the internal surface after the cold working (Rz) is more than the 15 μ m.
(2) a kind of good steel pipe of anti-separability of scale of pipe internal surface is characterized in that, contains the Cr of 9～28 quality %, and the maximum height of the internal surface after the cold working (Rz) is more than the 15 μ m, and Δ Hv is more than 100.Wherein, Δ Hv is Vickers' hardness poor of the interior surface layers of pipe and wall thickness central part.
(3) the good steel pipe of anti-separability of the scale of the pipe internal surface of a kind of (1) or (2) is characterized in that, numbers the tissue of representing to have more than 7 with ASTM austenite matrix granularity.
" cold working " of described (1) and (2) is preferably the plastic working that utilizes shot peening to carry out.
Description of drawings
Fig. 1 is the figure of expression for the shape of the experiment slice of the uses such as connecting airtight property experiment of scale, (a) is vertical view, (b) is side-view.
Fig. 2 is the figure that the main points of connecting airtight power of scale are measured in expression.
Embodiment
The inventor etc. find out that when the layer of having implemented shot peening processing was applied thermal shocking, scale had situation about peeling off and situation about not peeling off, and its difference is to process the surfaceness on top layer.That is, confirm that scale is not peeled off basically under surfaceness is situation more than the certain value, under the situation less than this value, then scale is peeled off easily.
When rising the thermal shocking that causes when the rapid temperature reduction that is subjected to stopping to cause and by the rapid temperature that running begins to cause once more by running, then on the interface of the interface of tube material (mother metal) and scale or internal layer scale and outer scale, be easy to generate stress, peeling off of scale taken place easily.Become remarkable under the situation of the surface smoothing of this tendency before oxidized.
In contrast, in the concavo-convex surface of the roughness more than being provided with certain value, the stress that produces on the interface of mother metal and scale is disperseed by each concavo-convex spacing, relatively diminishes.Thus, think and just be difficult to produce peeling off of scale.This effect also can obtain on the interface of internal layer scale and outer scale.
The inside surface roughness that obtains the pipe of described effect is expressed as the above roughness of 15 μ m with maximum height (Rz).More preferably, maximum height (Rz) is more than the 25 μ m.For water vapour mobile to the pipe inner face not causes detrimentally affect, the upper limit of maximum height (Rz) preferably is made as about 80 μ m.And this what is called maximum height (Rz) is the amount by the annex C definition of JIS B0601-2001.
On the basis of adjusting inside surface roughness as mentioned above,, and, just can further improve the anti-separability of scale by making the grain refined of organizing of tube material (mother metal) by the dependent variable of further raising inner face machined layer.
As previously mentioned, when make to the internal surface utilization of pipe use the shot peening of steel ball etc. applied the material of plastic working, when contact with the pyritous overheated steam, will the steel uniform surface generation as thin as a wafer and the scale of the slow Cr oxide compound of the speed of growth.This scale is because the scale resistance aspect is good, and the therefore growth of later scale, increase just are suppressed.Consequently, connect airtight the good scale of power what the inner face of pipe just generated thinner thickness.The dependent variable of machined layer is big more, and then this effect is obvious more.
Among the present invention,, use the such index of Δ Hv in order to hold described dependent variable quantitatively.The amount of the difference of the position that it is expression from the internal surface after the plastic working that utilizes shot peening etc. and carry out to the degree of depth of 40 μ m and the Vickers' hardness of thickness of pipe central part.In addition, reach under the situation that has the machined layer of enough having hardened more than 100 like that at this Δ Hv, pipe just has very good water-fast vapor-phase oxidation.And Vickers' hardness means by Hv0.1 (the experiment power: measured value 0.9807N) shown in the table 1 of the Z 2244 of JIS.
In addition, in the austenitic stainless steel, make the crystal grain grain refined, promptly number the tissue of representing to have more than 7 with ASTM austenite matrix granularity, in the generation that suppresses scale, and very effective aspect the connecting airtight property that improves scale.If make the crystal grain miniaturization, then can make the Cr concentration homogenization in the tube material (mother metal), thereby can suppress the growth of internal layer scale.In addition, the power of connecting airtight of the scale that has generated improves, and anti-separability is enhanced.
Be made as 15 μ m when above in maximum height (Rz), the processing that preferably utilizes shot peening to carry out with pipe internal surface.But, owing to be not only, make shaggy purpose simply, but also maximum height must be made as more than the 15 μ m for as in the past, therefore in order to reach this purpose, just must set the condition of shot peening.
For Δ Hv is made as more than 100, can utilize blow pressure or the increase that increase shot peening to blow number of times (number of pass times) and realize.In addition, the grain refined of tubing can utilize the known means such as adjustment of the creating conditions of the adjustment (for example interpolation of Nb) of the composition of pipe or pipe, heat-treat condition to realize.
The pipe that becomes object of the present invention is the stainless steel tube etc. that is used as alloy steel pipe, ferrite type or austenitic type that boiler uses.Though for the not special restriction of concrete material, because must be based on the oxide compound of Cr at the scale of the internal surface generation of pipe, so the material require of pipe is the steel pipe that contains the Cr of 9～28 quality %.
If illustration becomes the material of the pipe of object of the present invention, then have by the steel alloy of the STBA26 of JIS specification defined, ferritic stainless steel with excellent formability, austenitic stainless steel and the steel suitable as SUS304, SUS309, SUS310, SUS316, SUS321, SUS347 with them as SUS410.
If the chemical constitution of the operable steel grade class of illustration is then as follows.And, in following record, be meant " quality % " about the % of component content.
(1) contain that C:0.2% is following, Si:2.0% following, the ferritic stainless steel with excellent formability of Mn:0.1～3.0%, Cr:9～28%.This steel also can contain as required from by Ni:0.1～1.5%, Mo:0.1～5%, W:0.1～10%, Cu:0.1～5%, N:0.005～0.3%, V:0.01～1.0%, Nb:0.01～1.5%, Ti:0.01～0.5%, Ca:0.0001～0.2%, Mg:0.0001～0.2%, Al:0.0001～0.2%, B:0.0001～0.2% and rare earth element: select 0.0001～0.2% more than a kind.
(2) contain that C:0.2% is following, Si:2.0% following, the austenitic stainless steel of Mn:0.1～3.0%, Cr:9～28%, Ni:6～50%.This steel also can contain as required from by Mo:0.1～5%, W:0.1～10%, Cu:0.1～5%, N:0.005～0.3%, V:0.01～1.0%, Nb:0.01～1.5%, Ti:0.01～0.5%, Ca:0.0001～0.2%, Mg:0.0001～0.2%, Al:0.0001～0.2%, B:0.0001～0.2% and rare earth element: select 0.0001～0.2% more than a kind.
To describe the action effect of each composition of described steel grade class and the qualification reason of content below.
Below the C:0.2%
C is guaranteeing effective elements aspect intensity and the creep strength, in order to obtain this effect, is preferably containing more than 0.01%.But when its content surpassed 0.2%, carbide that will remaining not solid solution under the solutionizing treated state not only can not help the raising of hot strength, and mechanical propertiess such as toughness are caused detrimentally affect.So C content is made as below 0.2%.And, consider that from the viewpoint that hot workability reduces or toughness worsens preferred content is below 0.12%.
Below the Si:2%
Si is used as reductor and uses, and is effective elements aspect the water-fast vapor-phase oxidation of raising in addition, preferably contains more than 0.1%.On the other hand, when containing quantitative change for a long time, because therefore weldability or hot workability variation are made as below 2%.Preferred content is below 0.8%.
Mn：0.1～3.0％
Mn is identical with Si, and is effective as reductor, and the effect of the deterioration of the hot workability that inhibition causes by the S that contains as impurity is arranged.Consider from the viewpoint of deoxidation effect or hot workability improvement, make it to contain more than 0.1%.But if excessively contain, then owing to can cause embrittlement, therefore the upper limit with content is made as 3.0%.Be limited to 2.0% on preferred.
Cr：9～28％
In order to generate scale at the internal surface of pipe, need contain the steel of 9～28% Cr based on the oxide compound of Cr.In addition, according to guaranteeing the intensity under the high temperature or the viewpoint of scale resistance and erosion resistance, Cr is essential element, in order to bring into play its effect fully, need guarantee the content more than 9%.But when containing too much sometimes, owing to toughness or hot workability variation, so the upper limit is made as 28%.
Ni: being 6～50% in austenitic stainless steel, is 0.1～1.5% in ferritic stainless steel with excellent formability
In austenitic stainless steel, Ni makes the austenite structure stabilization, and improves the necessary element of creep strength, need contain more than 6%.In addition, the stability in order to ensure organizing under the high temperature, for a long time preferably contains more than 15%.But a large amount of interpolations can make effect saturated, because the interpolation more than it can cause the increase of cost, therefore is made as and increases to 50%.Preferred addition is below 35%, more preferably below 25%.In addition, in ferritic stainless steel with excellent formability,, therefore as required, make it to contain more than 0.1% because Ni produces effect aspect the toughness improving.But when surpassing 1.5%, creep-rupture strength will reduce.
Mo：0.1～5％、W：0.1～10％、Cu：0.1～5％
Therefore Mo, W and Cu preferably contain owing to improve the hot strength of steel.Its effect can by make at least any one contain 0.1% with on bring into play.In addition, if a large amount of containing then owing to can damage weldability or processibility, therefore is made as 5% with the upper limit respectively for Mo and Cu, the upper limit is made as 10% for W.
N：0.005～0.3％
N helps the solution strengthening of steel, has in addition to combine with other element and utilize precipitation strength to be used for strengthening the effect of steel.Under the situation that will obtain this effect, make it to contain more than 0.005%.But, when surpassing 0.3%, just have the situation of ductility or weldability variation.
V：0.01～1.0％、Nb：0.01～1.5％、Ti：0.01～0.5％
V, Nb and Ti can combine with carbon and nitrogen and form carbonitride, help precipitation strength.So, preferably make containing more than 0.01% more than a kind of they.On the other hand, when their content became too much, then because the processibility of steel suffers damage, so V is the upper limit with 1.0%, and Nb is the upper limit with 1.5%, Ti was the upper limit with 0.5%.
Ca:0.0001～0.2%, Mg:0.0001～0.2%, Al:0.0001～0.2%, B:0.0001～0.2% and rare earth element: 0.0001～0.2%
Ca, Mg, Al, B and rare earth element (La, Ce, Y, Pd, Nd etc.) all have the effect that improves intensity, processibility, water-fast vapor-phase oxidation.Under the situation that will obtain these effects, make more than a kind and contain more than 0.0001% respectively.On the other hand, when the content of these elements surpassed 0.2% respectively, then processibility or weldability just suffered damage.
[embodiment]
The steel pipe of the chemical constitution shown in the his-and-hers watches 1 is handled with thermal treatment shown in the table 2 and processing conditions, has adjusted crystal size.Be meant that with the what is called " cold working " of pipe A-2 and B-2 the cold roll forming in the pipe manufacturer operation processes for experiment in the table 2.Use these steel pipes that the anti-separability of scale is studied.Experiment condition is as follows.
(1) size of pipe
External diameter 50.8mm, wall thickness 8.0mm
(2) Biao Mian processing
The internal surface of described pipe has been implemented shot peening processing.Its condition is as follows.
Employed shot-peening: martensite steel ball (median size 600 μ m)
The amount of blowing of shot-peening: about 10kg/min (being illustrated in the table 3)
Blow pressure: shown in record in the table 3.And, in order to improve the hardness of machined layer, adopted 58.8N/cm
2Above pressure.
Blow number of times: shown in record in the table 3, change blows number of times (number of pass times), and surfaceness is adjusted.And so-called " 1 time by " is meant, the shot-peening injection nozzle of the inside that is inserted into pipe is moved with 250mm/min, from the end to end of pipe, carries out shot-peening under described condition.
(3) mensuration of crystal size and hardness
Pipe before shot peening is taked experiment slice, and the section that cuts along thickness direction is carried out microscopic examination, has measured crystal size.In addition, to the finished surface (position of the degree of depth of 40 μ m) of having implemented the experiment slice after the shot peening processing and (the experiment power: 0.9807N) measure, obtained its poor (Δ Hv) of Vickers' hardness Hv0.1 separately of wall thickness central part from the surface.
(4) the connecting airtight property experiment of scale
The pipe after having implemented shot peening processing, cut out the experiment slice 1 of the shape shown in Fig. 1.In with figure, L=25mm, w=20mm, t=5mm.And the oblique line portion 2 among the figure is the part of bonding anchor clamps 3 shown in Figure 2.
Described experiment slice is exposed in the steam atmosphere 10,000 hours under 650 ℃, makes the scale growth.In a side of the pipe inner face that is equivalent to this experiment slice, bonding jig 3 as shown in Figure 2, and two ends are fixed on the anchor clamps 4 (jig), apply drawing force along the direction of arrow, measure the power that scale is peeled off, with its value as connecting airtight power.Employed binding agent is the Araldite (trade(brand)name) of HuntsmanAdvanced Materials corporate system in anchor clamps 3 bonding.
Above experimental result is illustrated in the table 3.
Table 1
| The steel grade class | (quality %, remainder: Fe and impurity) is formed in representative | |||||||
| C | Si | Mn | Cr | Ni | Nb | Cu | N | |
| A | 0.08 | 0.6 | 1.6 | 18.0 | 10.0 | 0.8 | - | - |
| B | 0.10 | 0.2 | 0.8 | 18.0 | 9.0 | 0.5 | 3 | 0.1 |
| C | 0.06 | 0.4 | 1.2 | 25.0 | 20.0 | 0.45 | - | 0.2 |
Table 2
| For the experiment pipe | The thermal treatment behind the tubulation and the condition of processing | The ASTM crystal size |
| A-1 | 1200 ℃ * 2min → shot peening | 5.1 |
| A-2 | 1250 ℃ * 2min → cold working → 1180 * 2min → shot peening | 9.2 |
| B-1 | 1200 ℃ * 2min → shot peening | 5.2 |
| B-2 | 1200 ℃ * 2min → cold working → 1180 * 2min → shot peening | 8.9 |
| C | 1200 ℃ * 2min → shot peening | 5.8 |
Annotate: for the A-1 that tests with pipe is the material that is equivalent to SA213-TP347H, and A-2 is the material that is equivalent to SA213-TP347HFG, and B-1 and B-2 are the material that is equivalent to ASME Code 2328-1, and C is the material that is equivalent to SA213-TP310HCbN.
Table 3
| Experiment numbers | Distinguish | Using for experiment of table 2 managed | Shot peening | Maximum height Rz (μ m) | ΔHv | ASTM crystal size numbering | Scale connects airtight power (MPa) | ||
| Number of pass times | The amount of blowing (kg/min) | Blow pressure (N/cm 2) | |||||||
| 1 2 | The comparative example comparative example | A-1 A-1 | 1 2 | 10.1 9.8 | 49.0 50.0 | 8 12 | 60 85 | 5.1 5.1 | 6.9 7.8 |
| 3 4 5 6 7 8 | The present invention's example the present invention example the present invention example the present invention's example the present invention's example example of the present invention | A-1 A-1 A-1 A-2 A-2 A-2 | 3 4 4 3 4 4 | 10.2 10.1 10.5 9.9 10.0 10.3 | 50.0 49.0 69.6 49.0 50.0 68.6 | 18 25 27 27 26 27 | 92 98 185 91 141 182 | 5.1 5.1 5.1 9.2 9.2 9.2 | 9.8 10.8 11.8 13.7 14.1 14.7 |
| 9 10 | The comparative example comparative example | B-1 B-1 | 1 2 | 9.9 10.1 | 49.0 50.0 | 9 13 | 68 90 | 5.2 5.2 | 6.9 7.8 |
| 11 12 13 14 15 | The present invention's example the present invention example the present invention's example the present invention's example example of the present invention | B-1 B-1 B-2 B-2 B-2 | 3 4 3 4 4 | 10.2 10.3 10.0 10.2 10.5 | 49.0 70.6 49.0 68.6 70.6 | 17 28 18 26 28 | 92 178 93 144 186 | 5.2 5.2 8.9 8.9 8.9 | 9.8 11.8 13.7 14.4 14.7 |
| 16 17 | The comparative example comparative example | C C | 1 2 | 9.7 9.9 | 49.0 51.0 | 8 14 | 58 95 | 5.8 5.8 | 7.8 7.8 |
| 18 19 20 | The present invention's example the present invention's example example of the present invention | C C C | 3 4 4 | 10.2 10.1 10.3 | 50.0 49.0 70.6 | 19 27 31 | 96 139 191 | 5.8 5.8 5.8 | 13.9 14.0 15.7 |
From table 3, can be clear that, when the maximum height on surface when 15 μ m are above, connecting airtight power will reach more than the 9.8MPa.When connecting airtight power less than 9.8MPa, the connecting airtight property of scale is insufficient, peel off easily under situation about being subjected to by the starting of boiler and the thermal shocking that stops to cause, and example of the present invention all possesses enough connecting airtight property.
The Δ Hv of experiment numbers 5,12,19 and 20 experiment slice is more than 100, and it is bigger that scale connects airtight power.The experiment numbers 6,13 of the fine grained structure of crystal size numbering more than 7 is also identical.In addition, Δ Hv more than 100 and crystal size numbering in the example more than 7, can obtain the power of connecting airtight of great scale.
And under the condition of the shot peening of this embodiment, number of pass times is 1 time or 2 times, then can't obtain given surfaceness.That is, in the shot peening that only 1 time is passed through as in the past, have the position that steel ball does not collide fully at pipe internal surface, surfaceness can't be reached purpose of the present invention less than prescribed value.In order to ensure the surfaceness more than the prescribed value, need carry out repeatedly shot peening.
The industrial possibility of utilizing
Steel pipe of the present invention is the very good steel pipe of anti-fissility of the scale of inner surface. This steel pipe is suitable for as the uses such as boiler tube that are subject to steam oxidation. In addition, even owing to the thermal stress that repeatedly causes that is subject to by heating and cooling, scale also is difficult to peel off, and therefore just can reduce significantly the generation of the accidents such as obstruction of pipe.
Claims (3)
1. the good steel pipe of anti-separability of the scale of a pipe internal surface is characterized in that, contains the Cr of 9～28 quality %, and the maximum height Rz of the internal surface after the cold working is more than the 15 μ m.
2. the good steel pipe of anti-separability of the scale of a pipe internal surface is characterized in that, contains the Cr of 9～28 quality %, and the maximum height Rz of the internal surface after the cold working is more than the 15 μ m, and AHv is more than 100; Wherein, AHv is Vickers' hardness poor of the interior surface layers of pipe and wall thickness central part.
3. the good steel pipe of anti-separability of the scale of pipe internal surface according to claim 1 and 2 is characterized in that, numbers the tissue of representing to have more than 7 with ASTM austenite matrix granularity.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004267721 | 2004-09-15 | ||
| JP2004267721 | 2004-09-15 | ||
| JP2005097997 | 2005-03-30 |
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| CN100473730C CN100473730C (en) | 2009-04-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510909A (en) * | 2011-11-18 | 2012-06-20 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN102712975A (en) * | 2010-06-09 | 2012-10-03 | 住友金属工业株式会社 | Austenitic stainless steel tube having excellent steam oxidation resistance, and method for producing same |
| CN104278136A (en) * | 2013-07-07 | 2015-01-14 | 王波 | Method for performing cold working to internal surface of stainless steel tube through vibration of steel shots |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107709595B (en) * | 2015-07-01 | 2019-07-23 | 日本制铁株式会社 | Austenitic heat-resistant alloy and welding structural element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW426753B (en) * | 1997-06-30 | 2001-03-21 | Sumitomo Metal Ind | Method of oxidizing inner surface of ferritic stainless steel pipe |
| FR2823226B1 (en) * | 2001-04-04 | 2004-02-20 | V & M France | STEEL AND STEEL TUBE FOR HIGH TEMPERATURE USE |
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2005
- 2005-08-10 CN CNB2005100914333A patent/CN100473730C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712975A (en) * | 2010-06-09 | 2012-10-03 | 住友金属工业株式会社 | Austenitic stainless steel tube having excellent steam oxidation resistance, and method for producing same |
| US8852362B2 (en) | 2010-06-09 | 2014-10-07 | Nippon Steel & Sumitomo Metal Corporation | Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor |
| EP2581464B1 (en) * | 2010-06-09 | 2018-09-19 | Nippon Steel & Sumitomo Metal Corporation | Austenitic stainless steel tube having excellent steam oxidation resistance, and method for producing same |
| CN102510909A (en) * | 2011-11-18 | 2012-06-20 | 住友金属工业株式会社 | Austenitic stainless steel |
| CN102510909B (en) * | 2011-11-18 | 2014-09-03 | 新日铁住金株式会社 | Austenitic stainless steel |
| CN104278136A (en) * | 2013-07-07 | 2015-01-14 | 王波 | Method for performing cold working to internal surface of stainless steel tube through vibration of steel shots |
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| Publication number | Publication date |
|---|---|
| CN100473730C (en) | 2009-04-01 |
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Commission number: 4W113789 Conclusion of examination: On the basis of claims 1-3 submitted by the patentee on May 5, 2022, continue to maintain the validity of invention patent number 200510091433.3 Decision date of declaring invalidation: 20220822 Decision number of declaring invalidation: 57758 Denomination of invention: Steel pipes with excellent peel resistance of scales on the inner surface of the pipe Granted publication date: 20090401 Patentee: NIPPON STEEL & SUMITOMO METAL Corp. |
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