CN101265548A - Austenite stainless heat-resistance seamless shot blasting steel pipe - Google Patents
Austenite stainless heat-resistance seamless shot blasting steel pipe Download PDFInfo
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- CN101265548A CN101265548A CNA2008100329634A CN200810032963A CN101265548A CN 101265548 A CN101265548 A CN 101265548A CN A2008100329634 A CNA2008100329634 A CN A2008100329634A CN 200810032963 A CN200810032963 A CN 200810032963A CN 101265548 A CN101265548 A CN 101265548A
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Abstract
The invention relates to an Austenite stainless heat resistant seamless shot peening steel pipe. A hardened layer with structure and stress enhanced characteristic is arranged on the inner wall surface of the shot peening steel pipe and uniformly distributed along the periphery and overall length directions of the steel pipe. Strain-hardening glide lines with uniformly distributed crystal grains and high density are formed in the structure enhanced layer with thickness not less than 75 mum; and can reduce electrochemical property difference between crystal grains and grain boundary, and accelerate the diffusion of the Cr element with resistance against high temperature stream and oxidation corrosion in a metal matrix to the steel pipe inner wall surface along the grain boundary and intensive glide lines when the operating temperature of the working medium inside the steel pipe is higher than 560 DEG C to form a self-protecting layer with Cr content 20-30%. Because of the stress enhancement of the inner wall surface of the shot peening steel pipe, the hardness in the hardened layer at the site 60 mum away from the steel pipe inner wall meets the technical requirements including that the hardness is higher than 280HV or the hardness difference with matrix metal is not less than 100HV, so as to improve the resistance of 18Cr-8Ni Austenite stainless heat resistant steel pipe against high temperature stream and oxidation corrosion.
Description
Technical field
The present invention relates to a kind of austenite stainless heat-resistance seamless shot blasting steel pipe, especially relate to and generating electricity with high temperature section high temperature resistance steam oxidation corrosive austenite stainless heat-resistance seamless shot blasting steel pipes such as overcritical and Ultra-Super Critical Pressure Boiler superheater, reheaters.
Background technology
China's thermoelectricity generating has entered overcritical and development epoch ultra supercritical pressure, the steam exit pressure of station boiler has reached 28MPa, steam exit temperature is up to 605 ℃, under so high parameter, the inwall of the normally used 18Cr-8Ni type of boiler surface piping high temperature section TP304H, austenite stainless heat-resistance steel pipes such as TP321H, TP347H is faced with the threat of high-temperature steam oxidation corrosion.
After austenite stainless heat-resistance steel pipe inwall is subjected to high-temperature steam oxidation corrosion, the wall top layer will generate oxide scale film within it, and this epithelium is by a kind of internal layer material (Fe
2Cr
2Ni)
3O
4Point crystal formation oxide compound and outer material Fe
2O
3And Fe
3O
4The double-deck material that oxide compound is formed, under the operating mode of high temperature, high pressure and long-time running, oxide scale film constantly thickens, peels off, peel off phenomenon and mainly occur in skin, and with the elbow of build-up of limescale at piping, or be blown into steam turbine at a high speed with steam, jeopardize the safe operation in boiler and power station.
Summary of the invention
Main purpose of the present invention aims to provide a kind of steel pipe that thermal power generation has high temperature resistance steam oxidation corrosive nature with heating surface piping high temperature section such as overcritical and Ultra-Super Critical Pressure Boiler superheater, reheaters that is used for for a kind of austenite stainless heat-resistance seamless shot blasting steel pipe is provided.
For achieving the above object, austenite stainless heat-resistance seamless shot blasting steel pipe inwall of the present invention top layer generates a high temperature resistance steam oxidation corrosive hardened layer with build up and stress reinforced feature.
The hardened layer layer depth that described shot blasting steel pipe inwall top layer has tissue signature is not less than 75 μ m.
Be not less than in the 200 μ m and have one to have stress reinforced hardened layer apart from described steel pipe inwall layer depth, contiguous steel pipe inwall place hardness reaches as high as more than the 400HV, and radially is that thickness direction descends along steel pipe, is tending towards the hardness of metallic matrix gradually.
The described steel pipe inwall layer depth of distance is not less than and is formed on the strain hardening slip line that intragranular is evenly distributed, density is very high in the 75 μ m.
Hardness apart from described shot blasting steel pipe inwall 60 μ m place hardened layers is not less than 280HV.
Compare with matrix hardness apart from described shot blasting steel pipe inwall 60 μ m place hardened layers, both are not less than 100HV at difference of hardness.
Described shot blasting steel pipe inwall hardened layer along shot blasting steel pipe circumferentially and the total length direction be evenly distributed.
The interior diameter of described shot blasting steel pipe is 24mm≤ID≤60mm, and its length is L≤12M.
The advantage of austenite stainless heat-resistance seamless shot blasting steel pipe of the present invention; when promptly being steel pipe intraductal working medium operating temperature greater than 560 ℃; can quicken that the Cr element spreads to steel pipe inwall top layer in the steel pipe matrix; the Cr amount of containing that makes steel pipe inwall top layer is increased to 20% even higher and generate high temperature resistance steam oxidation corrosive self-insurance sheath by 18%, improves steel pipe inwall high temperature resistance steam oxidation corrosive nature.
In view of above-mentioned advantage, austenite stainless heat-resistance seamless shot blasting steel pipe of the present invention has the high temperature resistance of effect steam oxidation corrosive performance, when it applies to thermal power generation with the high temperature section of heat sink pipings such as overcritical and ultra-supercritical boiler superheater, reheater, it is estimated, continuous operation through nearly ten years, the oxide scale film thickness of generation is reduced to 1.3 μ m by the 150-200 μ m of shot blasting steel pipe not.
Description of drawings
Diagrammatic cross-section when Fig. 1 carries out shot peening strengthening for austenite stainless heat-resistance seamless shot blasting steel pipe of the present invention by spray gun;
The SA213-TP304H inner wall shot blasting textura epidermoidea that Fig. 2 (a) is φ 51 * 7.5mm for austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention strengthens metallographic microscopic appearance figure;
Fig. 2 (b) is the stress reinforced hardness HV trial value at the austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention SA213-TP304H inner wall shot blasting top layer layer depth 60 μ m places that are φ 51 * 7.5mm;
The SA213-TP347H inner wall shot blasting textura epidermoidea that Fig. 3 (a) is φ 48.26 * 7.9mm for austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention strengthens metallographic microscopic appearance figure;
The SA213-TP347H inner wall shot blasting top layer microhardness metallographic microscopic appearance figure that Fig. 3 (b) is φ 48.26 * 7.9mm for austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention;
Fig. 3 (c) is inner wall shot blasting top layer microhardness measuring point and the trial value thereof of the austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention SA213-TP347H that is φ 48.26 * 7.9mm;
Fig. 3 (d) is the inner wall shot blasting top layer of the austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention SA213-TP347H that is φ 48.26 * 7.9mm the microhardness HV distribution plan with layer depth;
Fig. 4 (a) is that the inner wall shot blasting textura epidermoidea of the Super 304H of φ 51 * 7.5mm strengthens and microhardness metallographic microscopic appearance figure for the specification of austenite stainless heat-resistance seamless shot blasting steel pipe of the present invention;
Fig. 4 (b) is inner wall shot blasting top layer microhardness measuring point and the trial value thereof of the austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention Super 304H that is φ 51 * 7.5mm;
Fig. 4 (c) is the inner wall shot blasting top layer of the austenite stainless heat-resistance seamless shot blasting steel pipe specification of the present invention Super 304H that is φ 51 * 7.5mm the microhardness HV distribution plan with layer depth.
Embodiment
The specification of austenite stainless heat-resistance seamless shot blasting steel pipe 100 of the present invention is interior diameter (ID) 24mm≤ID≤60mm, length L≤12M.The steel grade of this steel pipe 100 is austenite stainless heat-resisting seamless steel pipes of 18Cr-8Ni type, grade of steel has three kinds of ASMESA213-TP304H, TP347H and ASME Code Case2328-1 (being Japanese Sumitomo Super 304H), and TP304H is the austenite stainless heat-resisting seamless steel pipe of 18Cr-8Ni standard type; TP347H has added 0.8%Nb in the TP304H steel; And Super304H falls Mn to add 3%Cu, 0.45%Nb and micro-N in the TP304H steel, and they are 10 years old
5The hr creep-rupture strength is 1.85 times of TP304H steel, and the specification of above-mentioned three kinds of grade of steel steel pipes 100 (φ external diameter * thickness): TP304H is φ 51 * 7.5mm; TP347H is φ 48.26 * 7.9mm; Super 304H is φ 51 * 7.5mm, and length is all 12M.
The shot peening of the austenite stainless heat-resisting seamless steel pipe 100 of above-mentioned three kinds of grades of steel is to carry out on austenite stainless heat-resisting seamless steel pipe internal wall reinforced peening automatic production line, and the shot peening main technologic parameters is as follows:
1. shot-peening pressure: P=1.2 ± 0.5Mpa;
2. spray gun translational speed: v=0.5M/min;
3. single rifle shot-peening amount: w=8-10kg/min;
4. shot material: 18Cr-8Ni;
5. shot specification: φ 0.6 ball shot.
Please referring to Fig. 1, the spray gun 200 that austenite stainless heat-resistance seamless shot blasting steel pipe 100 of the present invention is made up of spray boom 240 and nozzle 220 comes its inwall 110 is carried out shot peening, this shot peening is a shot, and (P=1.2 ± 0.5Mpa) is that the gas ball mixed flow of carrier enters spray boom 240 with high-pressure air source, and with the speed of shot-peening amount w=8-10kg/min from nozzle 220 ejection shooting steel pipe inwalls 110, make the tissue and the stress on steel pipe inwall 110 top layers obtain to strengthen, generate the hardened layer of certain layer depth.
Nozzle 220 gas ball mixed flows outlet in the above-mentioned spray gun 200 is to shoot steel pipe inwall 110 at a high speed along 360 ° of narrow annular housings, because spray boom 240 designs along steel pipe 100 radial flexibilities, under the effect of tube wall reactive force, make nozzle 220 centers in the shot-peening process, be suspended on the medullary ray of steel pipe 100 all the time, nozzle 220 along with rigidity (length direction) spray boom 240 with spray gun movement speed v=0.5M/min at the uniform velocity during pumpback, steel pipe inwall 110 not only radially but also along the length direction of steel pipe 100 has obtained shot peening under the same process parameter along steel pipe 100.
Please strengthen the test result of metallographic microscopic appearance figure, microhardness microscopic appearance figure and microhardness referring to Fig. 2-4 shot blasting steel pipe inwall 110 textura epidermoideas, its result shows that this steel pipe inwall 110 has build up and stress reinforced feature in the scope of certain layer depth:
1. build up feature
The metallographic microanalysis is found; in TP304H steel pipe inwall 110 top layer layer depths 100 mu m ranges; in TP347H steel pipe inwall 110 top layer layer depths 120 mu m ranges; intragranular in Super304H steel pipe inwall 110 top layer layer depths 130 mu m ranges is distributed with even and intensive strain hardening slip line; the slip line of these intracrystallines has reduced the electrochemistry difference between intracrystalline and the crystal boundary just; and the intraductal working medium temperature greater than 560 ℃ operation condition under; having quickened the Cr element in the metallic matrix spreads towards steel pipe inwall 110 top layers; make the Cr amount that contains on top layer bring up to 20% even higher, generate the rich Cr self-insurance of high temperature resistance steam oxidation corrosive sheath by 18%.
2. stress reinforced feature
Through microhardness HV
0.2Test is found: it is the hardened layer of feature that austenite stainless heat-resisting seamless steel pipe internal wall 110 top layers of these three kinds of trades mark all have with the hardness that is higher than metallic matrix, its layer depth is not less than 200 μ m, and the hardness of contiguous steel pipe inwall 110 is for reaching as high as more than the 400HV, and along radially (thickness direction) decline of steel pipe 100.Wherein apart from the hardness at 60 μ m places, steel pipe inwall 110 top layers greater than 330HV, or compare both difference of hardness greater than 130HV with the about 200HV of matrix hardness.
The hardened layer that shot blasting steel pipe inwall 110 generates changed the stressed condition on steel pipe inwall 110 top layers-introduced residual compressive stress, and this stressed condition has improved the performance of the tired and stress corrosion crack of austenite stainless heat-resisting seamless steel pipe 100 high temperature resistances.
Thus; inwall 110 top layers of austenite stainless heat-resistance seamless shot blasting steel pipe 100 of the present invention have the intraductal working medium temperature greater than 560 ℃ operating mode operational conditions under; generate necessary build up of rich Cr self-insurance sheath and stress reinforced feature, that is: the layer depth strengthened of steel pipe inwall 110 textura epidermoideas is not less than 75 μ m, is not less than 280HV or the difference of hardness of comparing with matrix hardness is not less than the technical requirements of 100HV apart from steel pipe inwall 110 top layers 60 μ m place hardness.
Scope of the present invention by claims but not aforementioned specification limit, equally, embodiment wherein is schematic but not determinate, therefore, all can be contained in the claim of the present invention in the implication and all changes in the scope of the equivalent of claims.Under the situation that does not deviate from its spirit and essential characteristic, can other ad hoc fashion implement the present invention, and these ad hoc fashions belong to scope of the present invention equally.
Claims (8)
1. an austenite stainless heat-resistance seamless shot blasting steel pipe is characterized in that: the described shot blasting steel pipe inwall top layer generation one high temperature resistance steam oxidation corrosive hardened layer with build up and stress reinforced feature.
2. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 1 is characterized in that: the hardened layer layer depth that described shot blasting steel pipe inwall top layer has tissue signature is not less than 75 μ m.
3. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 2, it is characterized in that: being not less than in the 200 μ m apart from described steel pipe inwall layer depth has one to have stress reinforced hardened layer, contiguous steel pipe inwall place hardness reaches as high as more than the 400HV, and radially be that thickness direction descends along steel pipe, be tending towards the hardness of metallic matrix gradually.
4. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 3 is characterized in that: be not less than apart from described steel pipe inwall layer depth and be formed on the strain hardening slip line that intragranular is evenly distributed, density is very high in the 75 μ m.
5. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 4 is characterized in that: the hardness apart from described shot blasting steel pipe inwall 60 μ m place hardened layers is not less than 280HV.
6. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 4 is characterized in that: compare with matrix hardness apart from described shot blasting steel pipe inwall 60 μ m place hardened layers, both are not less than 100HV at difference of hardness.
7. as claim 5 or 6 described austenite stainless heat-resistance seamless shot blasting steel pipes, it is characterized in that: described shot blasting steel pipe inwall hardened layer along shot blasting steel pipe circumferentially and the total length direction be evenly distributed.
8. austenite stainless heat-resistance seamless shot blasting steel pipe as claimed in claim 7 is characterized in that: the interior diameter of described shot blasting steel pipe is 24mm≤ID≤60mm, and its length is L≤12M.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100329634A CN101265548A (en) | 2008-01-23 | 2008-01-23 | Austenite stainless heat-resistance seamless shot blasting steel pipe |
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|---|---|---|---|
| CNA2008100329634A CN101265548A (en) | 2008-01-23 | 2008-01-23 | Austenite stainless heat-resistance seamless shot blasting steel pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110159912A (en) * | 2018-02-15 | 2019-08-23 | 丰田自动车株式会社 | The manufacturing method of pressure pan |
-
2008
- 2008-01-23 CN CNA2008100329634A patent/CN101265548A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110159912A (en) * | 2018-02-15 | 2019-08-23 | 丰田自动车株式会社 | The manufacturing method of pressure pan |
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Open date: 20080917 |