CN101265513A - Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device - Google Patents
Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device Download PDFInfo
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- CN101265513A CN101265513A CNA2008100329649A CN200810032964A CN101265513A CN 101265513 A CN101265513 A CN 101265513A CN A2008100329649 A CNA2008100329649 A CN A2008100329649A CN 200810032964 A CN200810032964 A CN 200810032964A CN 101265513 A CN101265513 A CN 101265513A
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Abstract
The invention relates to a shot peening strengthening method for Austenite stainless heat resistant seamless steel pipe inner wall and a device thereof. In the method, the inner wall of a steel shot of hardness more than or equal to 45HRc is shot by a spray gun under pressure more than or equal to 1.0Mpa and with high pressure gas as carrier to form a hardened layer with strengthened structure and stress, and the hardness of the hardened layer with distance 60 mum away from the steel pipe inner wall is more than 280HV or the hardness difference compared with the basal body is more than 100HV, so as to improve the resistance of the steel pipe inner against high temperature, steam, oxidation and corrosion. The device comprises a movable peening machine, a spray gun and two steel shot recovery chambers connected with the peening machine, a conveyer belt arranged below the peening machine, a steel shot elevator connected with the end of the conveyer belt, and a screener connected with the top of the conveyer belt, wherein the chamber openings of the two steel shot recovery chambers are hermitically connected with the external surfaces at the two ends of the steel pipe to form a steel shot recovery sealed chamber doubled with shot-peening function, the peening machine drives the spray gun to move along the direction of the steel pipe, and the recycling of the steel shot is realized via the steel shot recovery chambers at the two ends of the steel pipe and the conveyer belt below the steel pipe.
Description
Technical field
The present invention relates to a kind of austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device thereof, refer to that especially thermal power generation is with high temperature section austenite stainless heat-resisting seamless steel pipe internal wall high temperature resistance steam oxidation corrosive stress peening process and devices thereof 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, boiler surface piping high temperature section uses the inwall of austenite stainless heat-resistance steel pipe such as TP304H, TP321H, the TP347H of 18Cr-8Ni type to be faced with the threat of high-temperature steam oxidation corrosion usually.
In order to prevent the high-temperature steam oxidation corrosion of 18Cr-8Ni austenite stainless heat-resistance steel pipe inwall, current, " austenite stainless heat-resistance seamless shot blasting steel pipe " of inventor's invention makes overcritical and the design of ultra-supercritical boiler heating surface piping selects for use 18Cr-8Ni austenite stainless heat-resistance " shot blasting steel pipe " to become possibility, this " shot blasting steel pipe " is to implement shot peening strengthening processing at the steel pipe inwall, make its inwall top layer obtain tissue and stress reinforced, in order to improve the performance of 18Cr-8Ni austenite stainless heat-resistance steel pipe high temperature resistance steam oxidation.
For the steel pipe internal wall shot-blasting strengthening is produced a desired effect, need specific stress peening process and be the shotblast unit of purpose for realizing stress peening process and adapting to suitability for industrialized production.But, domesticly still can strengthen processing to austenite stainless heat-resisting seamless steel pipe internal wall without any complete processing or proper device.In order to realize the processing of steel pipe internal wall shot-blasting strengthening, referential technology is shot-blast process and the equipment that is used to remove the surface preparation before oxidation on metal surface skin dirt or the application, but, utilize this method can not form hardened layer on steel pipe inwall top layer, can not reach the high temperature resistance steam oxidation corrosive effect of expection, particularly, there is following defective in it:
1. bleed pressure is low, and P≤0.8MPa does not have enough source of the gas energy shooting steel pipe inwalls to generate hardened layer;
2. nozzle is a diffusing structure, can not gather enough flowed energy shooting steel pipe inwalls;
3. spray boom is a pression hose, can not guarantee 360 ° of even scatterings of nozzle centering, can not guarantee nozzle along its length at the uniform velocity, adjustable advancing;
4. as will realize that automation technolo need dispose complicated spray gun centering rotating mechanism, and length is only limited in the 2M;
5. during according to this technology and device operation thereof, operative employee and the shot-peening working spaces Room that exists together, and open recovery shot tool structural defect, thereby, not only shot recycling use totally, and shot and dust thereof can bring very big injury for operative employee's health.
This shows that shot-blast process and equipment thereof that metal material surface is cleared up are used for steel pipe internal wall strengthening, can not form the high temperature resistance steam oxidation corrosive hardened layer that reaches the key technical indexes.
Summary of the invention
The present invention is the technical research success of on metal material surface cleaning blasting technology basis autonomous innovation, because metal material surface cleaning blasting technology exists aforementioned geneogenous design defect, can not reach the technical requirements of shot blasting steel pipe, hardened layer can not appear, so can't be used on the seamless steel pipe internal wall shot-blasting strengthening technique; The inventor studies at the required condition of seamless steel pipe internal wall shot-blasting strengthening technique, shot-peening real example test through a large amount of develops the austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and the device thereof that adaptation suitability for industrialized production of the present invention.
Main purpose of the present invention is for providing a kind of austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device thereof, be intended to by this technology and device thereof, make the layer depth of steel pipe inwall hardened layer be not less than 75 μ m, be not less than 280HV or the difference of hardness of comparing with matrix is not less than 100HV in hardness, to improve above-mentioned steel pipe inwall high temperature resistance steam oxidation corrosive performance from steel pipe internal-surface 60 μ m hardened layers.
For achieving the above object, austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique of the present invention is that shot is that carrier forms ball gas mixed flow with the high-pressure air, through the atomizing of spray gun speedup the steel pipe inwall is shot, so that steel pipe inwall top layer reaches tissue and stress reinforced purpose; Wherein this shot is that material is 18Cr-8Ni, and diameter is the ball shot of 0.3mm≤D≤0.6mm, its hardness 〉=45HRc, the shot-peening pressure P 〉=1.0MPa of spray gun.
Spray gun processing movement speed v≤0.75M/min when aforesaid austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique, its peening system carry out shot peening strengthening to the steel pipe inwall.
Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening device of the present invention comprise conveying belt that a portable shotblasting machine, the spray gun that is connected with portable shotblasting machine, two shot recovery bins, be located at station seat, between the two shot recovery bins and be positioned at shot recovery bin below, one with terminal shot lift, the screening washer that is connected with the shot lift that links to each other of conveying belt.
Workpiece is on the station seat that is erected between the two shot recovery bins, shot is introduced conveying belt by two shot recovery bins, pour into shotblasting machine and source of the gas thorough mixing through lift and screening washer, and be carrier, quicken and atomizing is implemented shot peening strengthening and processed spraying the steel pipe inwall through spray gun with the high-pressure air source.Introduce conveying belt and use for the shot-peening operation continually capable of circulationly through two shot recovery bins by the shot of spray gun ejection.In addition, the portable shotblasting machine of said apparatus is placed on the trolley platform and can moves along the steel pipe length direction.
Described shotblasting machine is equipped with 4 spray guns, and its volume reaches 1.5M
3, once adorn the ball amount and reach 7 tons, can be conducted to few 5 shot-peening operations.
The Hatch Opening of described two shot recovery bins can be tightly connected with the two ends outside surface of workpiece, forms the shot that has the wheel abrator cabinet function concurrently and reclaims gas-tight silo.
Stress peening process of the present invention and device thereof have the following advantages:
1. shot-peening pressure height, P 〉=1.0MPa, single rifle air demand 〉=10M
3/ min has enough source of the gas energy that the steel pipe inwall that the shot shooting reaches 12M is generated hardened layer, and adapts to suitability for industrialized production.
2. single rifle shot-peening amount (w) is 1kg/min≤w≤20kg/min, spray gun processing translational speed 0.1M/min≤v≤2.0M/min, can form the suitable shot shooting steel pipe of concentration thus, thereby but efficient hardening steel pipe inwall makes it possess high temperature resistance steam oxidation corrosive performance.
3. shotblasting machine is provided with the upper and lower warning device of shot-peening amount and 4 spray guns, and shotblasting machine dress ball amount can reach 7 tons, and once adorning ball can amount to the omnidistance shot-peening of 20 steel pipe inwalls, production efficiency height for 5 times.
4. go out on the shotblasting machine that the ball valve is wear-resisting, anti-to be washed away, and can in a big way, adjust the ball amount, reach 1kg/min≤w≤20kg/min thereby make single rifle go out the ball amount.
5. shotblasting machine places on the dolly, and its spray gun translational speed variable range is big, can make spray spray gun processing translational speed be controlled at v≤0.75M/min.
6. spray gun goes out the ball valve by flange and shotblasting machine and is connected, with dolly when at the uniform velocity mobile, shot is carrier with the high-pressure air source, shoots the steel pipe inwall through the spray gun speedup for 360 ° along omnidistance the aligning automatically by the nozzle of spray gun with the steel pipe center of steel pipe length, thereby realizes shot peening strengthening processing.
7. the key technical indexes that the steel pipe inwall reaches behind the shot-peening is: the layer depth of steel pipe inwall hardened layer is greater than 75 μ m; Greater than 280HV, or compare difference of hardness greater than 100HV apart from the hardness of steel pipe inwall 60 μ m place hardened layers with matrix hardness.
8. the shot recovery bin of the shot peening strengthening device dual-use function that has sealing concurrently and reclaim makes operative employee and the shot-peening working spaces Room that do not exist together, and not only shot can total recycling use, and has prevented that shot and dust thereof from bringing injury to operative employee's health.
9. the main technical details (as bleed pressure, shot-peening speed) of the logistics in the shot-peening production line (source of the gas, shot source and steel pipe), shot-blast process all adopts PLC system electric automatic control, when saving manpower, can also guarantee its tolerance range, thereby realize the shot-peening automatization.
Description of drawings
Fig. 1 is the main schema of technology of the present invention;
Fig. 2 is the production line synoptic diagram of apparatus of the present invention.
Embodiment
In austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique of the present invention, its austenite stainless heat-resisting seamless steel pipe of selecting for use internal diameter (ID) 24mm≤ID≤60mm, length to be not more than 12M is processed, and selected method is that to drive hardness with the high-pressure air of P 〉=1.0MPa be that the shot of 45HRc is shot the steel pipe inwall through the spray gun speedup, process with the strain hardening physics mode, so that steel pipe inwall top layer reaches tissue and stress reinforced purpose.
With reference to the main schema of technology of the present invention among Fig. 1, can find out that the present invention sends into shot after via conveying, lifting, sorting among the portable shotblasting machine.Simultaneously, source of the gas is by the air compressor supercharging, through also sending into after air reservoir voltage stabilizing and the oily water separation operation among the portable shotblasting machine; Then, formation ball gas mixed flow is mixed at portable shotblasting machine in high-pressure air source and shot source, process being sprayed steel pipe inwall enforcement shot peening strengthening through the spray gun speedup, and deliver to the initial delivery position through the recovery bin recovery by the shot of spray gun ejection, use for the processing of steel pipe internal wall shot-blasting strengthening continually capable of circulationly.
Cooperate Fig. 2 can find out with reference to Fig. 1, the present invention be with shot via conveying belt 150 and shot lift 100 input shot screening washers 400 screening and separating small grain size shot and impurity, and particle size diameter (D) is sent among the portable shotblasting machine 200 for the shot of 0.3mm≤D≤0.6mm.Simultaneously, high-pressure air source is that 1.3MPa and gas production rate satisfy single rifle and be not less than 10M by peak pressure
3The air compressor of/min (not showing among Fig. 2) supercharging is also sent into after air reservoir (not showing among Fig. 2) voltage stabilizing and oily water separation operation among the portable shotblasting machine 200; Then, formation ball gas mixed flow is mixed in high-pressure air source and shot source in portable shotblasting machine 200, making shot is carrier with the high-pressure air source, through spray gun 270 speedups steel pipe 300 inwalls that are placed between the two shot recovery bins 600 are implemented shot peening strengthening processing, use for the processing of steel pipe 300 internal wall shot-blasting strengthenings continually capable of circulationly and introduce conveying belt 150 through shot recovery bin 600 by the shot of spray gun 270 ejections.
The key technical indexes that steel pipe 300 inwalls reach behind the shot-peening is: the layer depth of steel pipe 300 inwall hardened layers is not less than 75 μ m; Hardness apart from steel pipe inwall 60 μ m places is not less than 280HV, and both difference of hardness of perhaps comparing with matrix are not less than 100HV.
In preferred embodiment of the present invention:
The interior diameter of this steel pipe (ID) is 24mm≤ID≤60mm;
This steel pipe length is L≤12M;
The material of this shot is the 18Cr-8Ni austenitic stainless steel;
The granularity of this shot (D) is 0.3mm≤D≤0.6mm;
The hardness of this shot is not less than 45HRc;
Shot-peening pressure P 〉=1.0MPa;
The ball amount that goes out of single spray gun is 1kg/min≤w≤20kg/min.
Austenite stainless heat-resisting seamless steel pipe 300 internal wall shot-blasting strengthening devices of the present invention, please cooperate referring to Fig. 1 and Fig. 2, this device mainly is to comprise a portable shotblasting machine 200, the dolly 900 of the portable shotblasting machine 200 of one carrying, the spray gun 270 that is connected with portable shotblasting machine 200, two shot recovery bins 600, one is located at the station seat 700 between the two shot recovery bins 600, one is positioned at the conveying belt 150 under the two shot recovery bins 600, the one shot lifts 100 that link to each other with conveying belt 150 ends, an and shot screening washer 400 that is connected with shot lift 100 tops, wherein, below portable shotblasting machine 200, be provided with wear-resisting, anti-wash away go out ball valve (among the figure indicate), and spray gun 270 by flange with go out the ball valve and be connected; Adding man-hour is to be erected between two shot recovery bins 600 with station seat 700 spraying steel pipe 300, and this is sprayed steel pipe 300 rear and front end outside surfaces respectively with preceding, rearmounted shot recovery bin 600 is by the salable connection of its Hatch Opening, the shot that formation has the wheel abrator cabinet function concurrently reclaims gas-tight silo, shot is promoted by shot lift 100 after shot screening washer 400 screens and is packed in the portable shotblasting machine 200, and provide high-pressure air source that shot is sent into via spray gun 270 by the air compressor (not shown) to portable shotblasting machine 200 to be sprayed in the steel pipe 300, carry out the shot peening strengthening of being sprayed steel pipe 300 inwalls is processed.
By Fig. 2, shot promotes the back by shot lift 100 and sends into shot screening washer 400 from the top, by its screening and isolate small grain size shot and impurity, and particle size diameter (D) is added ball storehouse 110 for what the shot of 0.3mm≤D≤0.6mm was sent into portable shotblasting machine 200 tops, enter among the portable shotblasting machine 200 by advancing ball mouth 220, the volume that can adorn shot in this movable type shotblasting machine 200 can reach 7 tons, and many spray guns 270 (present embodiment is four) can be installed thereunder, thus, once adorn the ball capacity in the portable shotblasting machine 200 and can amount to the omnidistance shot peening strengthening processing of 20 steel pipe 300 inwalls for 5 times of 4 spray guns 270.And the shot in the portable shotblasting machine 200 can enter in the spray gun 270 by going out the ball valve, this goes out the ball valve can adjust the ball amount in a big way, thereby may command enters the shot quantity of spray gun 270, make single rifle go out the ball amount and reach 1kg/min≤w≤20kg/min, and preferably be 10kg/min.On the other hand, as shown in Figure 1, the high-pressure air source that air forms after by compressor boost is also sent among the portable shotblasting machine 200 through the air reservoir voltage stabilizing and after experiencing the oily water separation operation.
Be still and cooperate Fig. 2 with reference to Fig. 1, above-mentioned high-pressure air source and shot form high pressure gas ball mixed flow, enter spray gun 270 from portable shotblasting machine 200, wherein the strong pressure P 〉=1.0MPa of high-pressure air source can form strong thrust to shot, makes shot speedup in spray gun 270 be placed in being sprayed in the steel pipe 300 between the two shot recovery bins 600 after it is sent into; And spray gun 270 is connected with the ball valve that goes out of shotblasting machine 200 by flange, and shot and steel pipe 300 inwall centers align 360 ° of shootings automatically it is strengthened processing when making shot-peening; Simultaneously, portable shotblasting machine 200 is placed on the trolley platform 900 and with it and moves along steel pipe 300 length directions, spray gun 270 pumpback in steel pipe 300 is moved and its inwall is carried out omnidistance shot peening strengthening processing thereby drive, this trolley platform 900 drives portable shotblasting machine 200 and the mobile speed of spray gun 270 processing can be adjusted in 0.1～2.0M/min, and generally the speed control that this shot peening is moved is at v≤0.75M/min.
Please referring again to Fig. 2, on the conveying belt 150 that the shot recovery bin 600 of shot through being divided into steel pipe 300 front and back ends of having finished steel pipe 300 inwall shooting work by ejection in the spray gun 270 imports under it, deliver to shot lift 100 by conveying belt 150, this shot lift 100 is sent into shot screening washer 400 after shot is promoted once more, screening is also isolated the small grain size shot and the impurity that wherein can not use for shot peening once more, add in the ball storehouse 110 and will wherein still can send into for the shot that shot peening uses, used in order to entering once more in the portable shotblasting machine 200 for steel pipe 300 internal wall shot-blasting strengthening techniques.Thus, by the shot recovery bin 600 at steel pipe 300 two ends and the conveying belt 150 and the shot lift 100 of below thereof, just can be used for the processing of steel pipe 300 internal wall shot-blasting strengthenings continuously with sending back to again from the shot of spray gun 270 ejections in the portable shotblasting machine 200, thus realize recycling of shot.
In austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique of the present invention and the device thereof, the main technical details (as bleed pressure, shot-peening speed) of the logistics of shot-peening production line (source of the gas, shot source and steel pipe), shot-blast process all adopts PLC system electric automatic control, when saving manpower, can also guarantee its tolerance range, thereby realize the shot-peening automatization.
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 (11)
1. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique, it is characterized in that: described technology is to drive shot formation ball gas mixed flow with high-pressure air through the spray gun speedup steel pipe inwall to be shot, and the strain hardening of being hit inner wall surface makes steel pipe top layer formative tissue and stress reinforced; Wherein
Hardness 〉=the 45HRc of described shot, the shot-peening pressure P 〉=1.0MPa of described spray gun.
2. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 1 is characterized in that: the material of described shot is 18Cr-8Ni.
3. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 1 or 2 is characterized in that: described shot is that diameter is the ball shot of 0.3mm≤D≤0.6mm.
4. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 3 is characterized in that: the processing movement speed v≤0.75M/min when described spray gun carries out shot peening strengthening to the steel pipe inwall.
5. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 4 is characterized in that: the high-pressure air air demand of single spray gun is not less than 10M
3/ min.
6. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 5 is characterized in that: the ball amount that goes out of single spray gun is 1kg/min≤w≤20kg/min.
7. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique as claimed in claim 6 is characterized in that: the steel grade of steel pipe that described technology is processed is an austenite stainless heat-resisting seamless steel pipe, and its internal diameter is 24mm≤ID≤60mm, and length is not more than 12M.
8. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening device is characterized in that: described device comprise conveying belt that a portable shotblasting machine, the spray gun that is connected with portable shotblasting machine, two shot recovery bins, be located at station seat, between the two shot recovery bins and be positioned at shot recovery bin below, one with terminal shot lift, the screening washer that is connected with the shot lift that links to each other of conveying belt.
9. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening device as claimed in claim 8 is characterized in that: described portable shotblasting machine is placed on the trolley platform, can move along the steel pipe length direction.
10. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening device as claimed in claim 9 is characterized in that: described shotblasting machine is equipped with 4 spray guns, and its volume reaches 1.5M
3, once adorn the ball amount and reach 7 tons, can be conducted to few 5 shot-peening operations.
11. austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening device as claimed in claim 10 is characterized in that: the Hatch Opening of described two shot recovery bins can be tightly connected with the two ends outside surface of workpiece, forms the shot that has the wheel abrator cabinet function concurrently and reclaims gas-tight silo.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100329649A CN101265513A (en) | 2008-01-23 | 2008-01-23 | Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device |
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| CNA2008100329649A CN101265513A (en) | 2008-01-23 | 2008-01-23 | Austenite stainless heat-resisting seamless steel pipe internal wall shot-blasting strengthening technique and device |
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| CN102212665A (en) * | 2011-06-10 | 2011-10-12 | 苏州热工研究院有限公司 | Inner wall shot peening strengthening treatment process and device |
| CN102517427A (en) * | 2011-12-16 | 2012-06-27 | 陕西飞机工业（集团）有限公司 | Device and method for reinforcing surfaces of assembly structural member holes |
| 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 |
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| CN103045830A (en) * | 2013-01-15 | 2013-04-17 | 西安交通大学 | Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel |
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| CN102517427B (en) * | 2011-12-16 | 2013-07-10 | 陕西飞机工业（集团）有限公司 | Device and method for reinforcing surfaces of assembly structural member holes |
| CN102517427A (en) * | 2011-12-16 | 2012-06-27 | 陕西飞机工业（集团）有限公司 | Device and method for reinforcing surfaces of assembly structural member holes |
| CN102764869A (en) * | 2012-07-16 | 2012-11-07 | 莱芜钢铁集团有限公司 | Continuous casting billet strengthening device and strengthening method in continuous casting process |
| CN102764869B (en) * | 2012-07-16 | 2014-12-10 | 莱芜钢铁集团有限公司 | Continuous casting billet strengthening device and strengthening method in continuous casting process |
| CN103045830A (en) * | 2013-01-15 | 2013-04-17 | 西安交通大学 | Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel |
| CN103045830B (en) * | 2013-01-15 | 2015-01-07 | 西安交通大学 | Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite 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 |
| CN107553074A (en) * | 2017-09-27 | 2018-01-09 | 宝钢特钢有限公司 | The manufacture method of high-temperature heater UNSN08810 iron nickel base alloy large-calibre seamless tubing |
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| CN109848858A (en) * | 2018-12-06 | 2019-06-07 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of antioxidative method of raising G115 steel pipe inner wall |
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