CN103556066A - Nickel-saving high-temperature-resistance seamless steel tube and production technology thereof - Google Patents
Nickel-saving high-temperature-resistance seamless steel tube and production technology thereof Download PDFInfo
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Abstract
The invention relates to a nickel-saving high-temperature-resistance seamless steel tube and a production technology thereof. Chemical components of the steel comprise, by mass, 0.03-0.08% of C, 1.60-1.90% of Si, 0.70% or less of Mn, 0.030% or less of P, 0.030% or less of S, 20.00-22.00% of Cr, 9.00-11.00% of Ni, 0.02-0.06% of Ce, 0.13-0.10% of N, and the balance Fe. The production technology comprises the steps of smelting, heating perforation, cold rolling and solid solution heat treatment. The steel has the advantages of substantial reduction of the consumption of Ni, low price, very high strength at 900DEG C, and good high temperature resistance.
Description
Technical field
The present invention relates to save the resistant to elevated temperatures stainless steel tube of nickel and production technique thereof.
Background technology
Heat-resistance stainless steel is widely used in boiler and pressurized vessel, as TP310S heat-resistance stainless steel, there is good oxidation-resistance, erosion resistance, because the chromium of higher percent and nickel, make to have much better creep strength, at high temperature can continuous operation, there is good high thermal resistance, when temperature surpasses 800 ℃, start to soften, permissible stress starts to continue to reduce.Because nickel (Ni), chromium (Cr) content are high, there is good oxidation, corrosion-resistant, acid and alkali-resistance, resistance to elevated temperatures, high temperature resistant steel pipe is exclusively used in occasions such as manufacturing electric heating boiler tube.
Due to constantly rising violently of nickel valency, the cost of nickel significantly rises.In order to reduce the consumption of nickel, a lot of industries are all attached great importance to joint nickel, for the research and development of the products such as nickel or technique.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, a kind of content that reduces nickel is provided, the stainless steel tube of the high temperature resistant mechanical property having had of energy.
Technical solution of the present invention is: the resistant to elevated temperatures weldless steel tube of a kind of joint nickel, the Chemical Composition of this steel (quality %) is: C 0.03～0.08, Si l.60～1.90, Mn≤0.70, P≤0.030, S≤0.030, Cr 20.00～22.00, and Ni 9.00～11.00, and Ce 0.02～0.06, N 0.13～0.10, and all the other are Fe.
The present invention also provides a kind of production craft step of above-mentioned steel pipe:
(A) select above-mentioned raw materials to smelt, wherein Ce selects mixed rare-earth materials, contains the Ce of 48 ~ 50% mass parts in mishmetal; In smelting process, mishmetal is wrapped up and is wire and is delivered in smelting furnace by iron sheet, and at the iron sheet that is wire, enter melt place and constantly add shielding gas; By iron sheet, wrap up mishmetal and be wire and be delivered into smelting furnace, the one, can avoid mishmetal directly to contact and react with oxygen in molten steel, sulphur etc., allow oxygen, sulphur etc. first react with iron, and have the protection of shielding gas, more can reduce the loss of rare earth.
(B) steel billet of smelting being made is delivered in process furnace and is heated, and the steel billet laggard eleven punch 11 of coming out of the stove, takes the lead, annealing, and steel pipe is made in pickling again; Wherein, in piercing process, have lubricating fluid taphole on top, the lubricating fluid in order to lubricated top and steel pipe internal-surface, in perforation, can be flowed out in top; Piercing process perforating apparatus used comprises top (1) and push rod (2), described push rod (2) inner hollow setting, form feed pathway (21), and the water pump (6) of lubricating fluid supercharging within the connection of push rod (2) one end is used for to feed pathway (21); In described top (1), offer the sprue (3) being communicated with feed pathway (21), sprue (3) flows to liquid storage district (4), and liquid storage district (4) surrounding is communicated with a plurality of runners (5); Contain the steel billet material of Se and N in hot piercing process, afterbody easily produces the defects such as inner surface cracks, infolding, spiricle, has affected tubing following process quality.In perforation, constantly add lubricant, in perforation, be top and be perforated and between material, have continuously lubricant, in whole perforation procedure, remain that lubricating fluid exists, while having avoided perforation by internal surface plucking, the rate of becoming a useful person and the quality of the material improving, and play cooling, extend the top effect in work-ing life.
(C) steel pipe above-mentioned steps (B) being obtained carries out cold-rolling treatment, and the pass of the roll of cold rolling use is arranged to segment of curve, and makes at least two sections of above curves; Stressed when rolling hole of steel pipe can be improved in the curved hole of rolling, and makes to shut out the stressed property of steel pipe of coming better.Hot piercing during due to front step process, the internal stress of steel pipe internal-surface is larger, so strengthen in this step the stressed of outer surface of steel tube, can effectively alleviate, the internal stress of dispersed steel pipe internal surface.
(D) carry out again solution heat treatment, the steel pipe that step (C) is obtained is sent in high-duty boiler, wherein high-duty boiler processing parameter is set as follows: heat-up time=material wall thickness (millimeter) * (0.8-1.2) minute, soaking time=material wall thickness (millimeter) * (18-22) second, the total time=heat-up time+soaking time of steel pipe in stove.Because FEOL makes the internal stress of steel pipe more concentrated, so eliminate excessive internal stress with thermal treatment here.
The heat-resisting austenitic stainless steel of joint nickel that uses mentioned component, can obtain nickeliferous low weldless steel tube, effectively saves the composition of nickel, reduces costs.And by this processing step, smelt the weldless steel tube and can effectively save smelting step, the mechanical property that improves the high temperature resistant of steel pipe and possessed.
As preferably, in step (2), first stainless steel steel billet material is repaired a die before, to deoil, pickling is lubricated, and wherein the concentration that is selected from of pickle solution is 6% ~ 7% hydrofluoric acid or the concentration nitric acid that is 10% ~ 12% or both mixing; Pickling need to be heated to 60 ℃ ~ 65 ℃ to steel billet from normal temperature, whole acid cleaning process 180-240 minute.Because the billet surface that smelted early stage has a lot of residues, so this step can be removed the residue of billet surface, be conducive to clamping steel billet and the perforation to steel billet of follow-up hot piercing process.And constantly heat in to the process of steel billet pickling, have more than 60 ℃ temperature when finally finishing, so both can decompose the acid that remains in billet surface, the smell of generation is just all removed in this step, while avoiding the later stage to wear piercing process, a large amount of pungent tastes of generation are decomposed in acid.Can first to steel billet, arrive certain temperature again, for later stage hot piercing process, do preheating, save the time, improve efficiency.
The runner of the perforating apparatus in described step (2) is divided into upper runner and lower flow channel.
The gait of march coming directly towards in described step (3) middle punch technique is 3 meters of per minutes, and the take-off rate of lubricating fluid is 0.5 ~ 1 liter of per minute.
Beneficial effect of the present invention is:
1, compare with 310S, performance is more superior, joint Ni, low price.
2, in the time of 900 ℃, have very high intensity, resistance to elevated temperatures is good, and use temperature scope is that 850 ~ 1100 ℃ of performances are better than TP310S, in air, under non-condition of bearing pressure, can use 1150 ℃, has superior high temperature oxidation resistance.
3, tensile strength in short-term at each temperature exceeds more than 20% than the intensity of common stainless steel (as 304,310S).
4, there is high temperature long-term behaviour (creep property, enduring quality).
Accompanying drawing explanation
Fig. 1 is the structural representation of perforating apparatus.
In figure: 1-top, 2-push rod, 21-feed pathway, 3-sprue ，4-liquid storage district, 5-runner,
51-lower flow channel, 52-upper runner, 6-water pump.
Embodiment
Below in conjunction with accompanying drawing, with embodiment, the invention will be further described.
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the modification that there is no creative contribution as required after reading this specification sheets, but as long as within the scope of claim of the present invention, are all subject to the protection of patent law.
Embodiment 1, and it is 6mm that the present embodiment is selected wall thickness, 30185 weldless steel tubes of diameter 76mm, the Chemical Composition of this steel (quality %) is: C 0.03～0.08, Si l.60～1.90, Mn≤0.70, P≤0.030, S≤0.030, Cr 20.00～22.00, and Ni 9.00～11.00, and Ce 0.02～0.06, N 0.13～0.10, and all the other are Fe.
The production technique of the described resistant to elevated temperatures weldless steel tube of joint nickel, comprises the steps:
(A) select above-mentioned raw materials to smelt, wherein Ce selects mixed rare-earth materials, contains the Ce of 48% mass parts in mishmetal; In smelting process, mishmetal is wrapped up and is wire and is delivered in smelting furnace by iron sheet, and at the iron sheet that is wire, enter melt place and constantly add shielding gas;
(B) steel billet of making after smelting is delivered in process furnace and heated, the furnace temperature of process furnace is 1150 ℃, and 120 minutes heat-up times, the steel billet laggard eleven punch 11 of coming out of the stove, takes the lead, annealing, and steel pipe is made in pickling again; Wherein, in piercing process, have lubricating fluid taphole on top, the lubricating fluid in order to lubricated top and steel pipe internal-surface, in perforation, can be flowed out in top; Piercing process perforating apparatus used comprises top 1 and push rod 2, and described push rod 2 inner hollow settings form feed pathway 21, and connects for the water pump 6 to the interior lubricating fluid supercharging of feed pathway 21 in push rod 2 one end; In described top 1, offer the sprue 3 being communicated with feed pathway 21, sprue 3 flows to liquid storage district 4, and liquid storage district 4 surroundings are communicated with a plurality of runners 5; By the feed pathway in push rod, be communicated with the sprue in top, make lubricating fluid enter into top, first lubricating fluid arrives liquid storage district, and liquid storage district can store lubricating fluid, by storing some lubricating fluids, can reduce the temperature of top, reach cooling effect.Then lubricating fluid flows to the surface of top by runner from storage area, reaches the effect of lubricated top working face.Because there is the effect of water pump, lubricating fluid itself has certain pressure to flow out outside top, can remain that like this layer protecting film is close to top surperficial.The in the situation that of larger in some tops, if only have a runner, the lubricating fluid probably flowing out is inadequate, but can not expand the size of runner, can cause like this some chip to enter in outlet, so runner 5 is divided into upper runner 52 and lower flow channel 51, is provided with the work output that lower flow channel strengthens lubricating fluid.The gait of march of top is 3 meters of per minutes, and the take-off rate of lubricating fluid is 0.5 ~ 1 liter of per minute.
(C) steel pipe above-mentioned steps (B) being obtained carries out cold-rolling treatment, and the pass of the roll of cold rolling use is arranged to segment of curve, and makes at least two sections of above curves.By rolling mutually of curved shape and steel pipe, can make steel pipe there is good strained condition and intensity preferably.Hot piercing during due to front step process, the internal stress of steel pipe internal-surface is larger, so strengthen in this step the stressed of outer surface of steel tube, can effectively alleviate, the internal stress of dispersed steel pipe internal surface.
(D) carry out again solution heat treatment, the steel pipe that step (C) is obtained is sent in high-duty boiler, wherein processing parameter is set as follows: heat-up time=material wall thickness (millimeter) * 0.8 minute, soaking time=material wall thickness (millimeter) * 18 seconds, the total time=heat-up time+soaking time of steel pipe in stove; In stove, temperature is arranged on 1120 ℃, needs 4.8 minutes, soaking time 108 seconds heat-up time like this.
In step (B), first stainless steel steel billet material is repaired a die before, deoil, pickling is lubricated, and wherein the concentration that is selected from of pickle solution is 6% hydrofluoric acid.Pickling need to be heated to 60 ℃ from normal temperature to steel billet.Whole acid cleaning process cost 180 minutes.Under home, be first normal temperature to 40 ℃ needs 120 minutes, be then incubated 30 minutes 40 ℃ time, then spend 30 minutes and be warmed up to 60 ℃.Normal temperature to 40 ℃, being then incubated this process is mainly that pickle solution carries out acid cleaning process to billet surface, removes impurity.Finally being warmed up to 60 ℃ is mainly the effect of thermolysis pickle solution again.
The compound GBT 13296-2008 of the weldless steel tube standard making.Tensile strength 520MPa, yield-point 205 MPa, density is at 7.98kg/dm
3.
The production technique of the described resistant to elevated temperatures weldless steel tube of joint nickel, comprises the steps:
(A) select above-mentioned raw materials to smelt, wherein Ce selects mixed rare-earth materials, contains the Ce of 48% mass parts in mishmetal; In smelting process, mishmetal is wrapped up and is wire and is delivered in smelting furnace by iron sheet, and at the iron sheet that is wire, enter melt place and constantly add shielding gas;
(B) steel billet of making after smelting is delivered in process furnace and heated, the furnace temperature of process furnace is 1070 ℃, and 160 minutes heat-up times, the steel billet laggard eleven punch 11 of coming out of the stove, takes the lead, annealing, and steel pipe is made in pickling again; Wherein, in piercing process, have lubricating fluid taphole on top, the lubricating fluid in order to lubricated top and steel pipe internal-surface, in perforation, can be flowed out in top; Piercing process perforating apparatus used comprises top 1 and push rod 2, and described push rod 2 inner hollow settings form feed pathway 21, and connects for the water pump 6 to the interior lubricating fluid supercharging of feed pathway 21 in push rod 2 one end; In described top 1, offer the sprue 3 being communicated with feed pathway 21, sprue 3 flows to liquid storage district 4, and liquid storage district 4 surroundings are communicated with a plurality of runners 5; Runner 5 is divided into upper runner 52 and lower flow channel 51, is provided with the work output that lower flow channel strengthens lubricating fluid.The gait of march of top is 3 meters of per minutes, and the take-off rate of lubricating fluid is 0.5 ~ 1 liter of per minute.
(C) steel pipe above-mentioned steps (B) being obtained carries out cold-rolling treatment, and the pass of the roll of cold rolling use is arranged to segment of curve, and makes at least two sections of above curves.
(D) carry out again solution heat treatment, the steel pipe that step (C) is obtained is sent in high-duty boiler, wherein processing parameter is set as follows: heat-up time=material wall thickness (millimeter) * 1.2 minutes, soaking time=material wall thickness (millimeter) * 22 seconds, the total time=heat-up time+soaking time of steel pipe in stove; In stove, temperature is arranged on 1150 ℃, needs 9.6 minutes, soaking time 176 seconds heat-up time like this.
In step (B), first stainless steel steel billet material is repaired a die before, deoil, pickling is lubricated, and wherein the concentration that is selected from of pickle solution is 10% nitric acid.Pickling need to be heated to 63 ℃ from normal temperature to steel billet.Whole acid cleaning process cost 240 minutes.Under home, be first normal temperature to 40 ℃ needs 120 minutes, be then incubated 60 minutes 40 ℃ time, then spend 60 minutes and be warmed up to 60 ℃.
The compound GBT 13296-2008 of the weldless steel tube standard making.Tensile strength 520MPa, yield-point 202 MPa, density is at 7.93kg/ dm
3.
The production technique of the described resistant to elevated temperatures weldless steel tube of joint nickel, comprises the steps:
(A) select above-mentioned raw materials to smelt, wherein Ce selects mixed rare-earth materials, contains the Ce of 48% mass parts in mishmetal; In smelting process, mishmetal is wrapped up and is wire and is delivered in smelting furnace by iron sheet, and at the iron sheet that is wire, enter melt place and constantly add shielding gas;
(B) steel billet of making after smelting is delivered in process furnace and heated, the furnace temperature of process furnace is 1200 ℃, and 150 minutes heat-up times, the steel billet laggard eleven punch 11 of coming out of the stove, takes the lead, annealing, and steel pipe is made in pickling again; Wherein, in piercing process, have lubricating fluid taphole on top, the lubricating fluid in order to lubricated top and steel pipe internal-surface, in perforation, can be flowed out in top; Piercing process perforating apparatus used comprises top 1 and push rod 2, and described push rod 2 inner hollow settings form feed pathway 21, and connects for the water pump 6 to the interior lubricating fluid supercharging of feed pathway 21 in push rod 2 one end; In described top 1, offer the sprue 3 being communicated with feed pathway 21, sprue 3 flows to liquid storage district 4, and liquid storage district 4 surroundings are communicated with a plurality of runners 5; Runner 5 is divided into upper runner 52 and lower flow channel 51, is provided with the work output that lower flow channel strengthens lubricating fluid.The gait of march of top is 3 meters of per minutes, and the take-off rate of lubricating fluid is 0.5 ~ 1 liter of per minute.
(C) steel pipe above-mentioned steps (B) being obtained carries out cold-rolling treatment, and the pass of the roll of cold rolling use is arranged to segment of curve, and makes at least two sections of above curves.
(D) carry out again solution heat treatment, the steel pipe that step (C) is obtained is sent in high-duty boiler, wherein processing parameter is set as follows: heat-up time=material wall thickness (millimeter) * 1.2 minutes, soaking time=material wall thickness (millimeter) * 22 seconds, the total time=heat-up time+soaking time of steel pipe in stove; In stove, temperature is arranged on 1200 ℃, needs 4.8 minutes, soaking time 88 seconds heat-up time like this.
In step (B), first stainless steel steel billet material is repaired a die before, deoil, pickling is lubricated, and wherein pickle solution is selected from the mixed solution that concentration is 7% hydrofluoric acid and the concentration nitric acid that is 12%.Pickling need to be heated to 63 ℃ from normal temperature to steel billet.Whole acid cleaning process cost 200 minutes.Under home, be first normal temperature to 40 ℃ needs 120 minutes, be then incubated 40 minutes 40 ℃ time, then spend 40 minutes and be warmed up to 63 ℃.
The compound GBT 13296-2008 of the weldless steel tube standard making.Tensile strength 518MPa, yield-point 200 MPa, density is at 8kg/dm
3.
Claims (5)
1. one kind is saved the resistant to elevated temperatures weldless steel tube of nickel, the Chemical Composition (quality %) that it is characterized in that this steel is: C 0.03～0.08, Si l.60～1.90, Mn≤0.70, P≤0.030, S≤0.030, Cr 20.00～22.00, and Ni 9.00～11.00, and Ce 0.02～0.06, N 0.13～0.10, and all the other are Fe.
2. by a production technique for the high temperature resistant weldless steel tube of joint nickel claimed in claim 1, it is characterized in that, comprise the following steps:
(A) select above-mentioned raw materials to smelt, wherein Ce selects mixed rare-earth materials, contains the Ce of 48 ~ 50% mass parts in mishmetal; In smelting process, mishmetal is wrapped up and is wire and is delivered in smelting furnace by iron sheet, and at the iron sheet that is wire, enter melt place and constantly add shielding gas;
(B) steel billet of smelting being made is delivered in process furnace and is heated, and the steel billet laggard eleven punch 11 of coming out of the stove, takes the lead, annealing, and steel pipe is made in pickling again; Wherein, in piercing process, have lubricating fluid taphole on top, the lubricating fluid in order to lubricated top and steel pipe internal-surface, in perforation, can be flowed out in top; Piercing process perforating apparatus used comprises top (1) and push rod (2), described push rod (2) inner hollow setting, form feed pathway (21), and the water pump (6) of lubricating fluid supercharging within the connection of push rod (2) one end is used for to feed pathway (21); In described top (1), offer the sprue (3) being communicated with feed pathway (21), sprue (3) flows to liquid storage district (4), and liquid storage district (4) surrounding is communicated with a plurality of runners (5);
(C) steel pipe above-mentioned steps (B) being obtained carries out cold-rolling treatment, and the pass of the roll of cold rolling use is arranged to segment of curve, and makes at least two sections of above curves;
(D) carry out again solution heat treatment, the steel pipe that step (C) is obtained is sent in high-duty boiler, wherein high-duty boiler processing parameter is set as follows: heat-up time=material wall thickness (millimeter) * (0.8-1.2) minute, soaking time=material wall thickness (millimeter) * (18-22) second, the total time=heat-up time+soaking time of steel pipe in stove.
3. by a kind of production technique that saves the high temperature resistant weldless steel tube of nickel claimed in claim 2, it is characterized in that: in step (B), first stainless steel steel billet material is repaired a die before, deoil, pickling is lubricated, and wherein the concentration that is selected from of pickle solution is 6% ~ 7% hydrofluoric acid or the concentration nitric acid that is 10% ~ 12% or both mixing; Pickling need to be heated to 60 ℃ ~ 65 ℃ to steel billet from normal temperature, whole acid cleaning process 180-240 minute.
4. by a kind of production technique that saves the high temperature resistant weldless steel tube of nickel claimed in claim 3, it is characterized in that: the runner (5) of the perforating apparatus in described step (B) is divided into upper runner (52) and lower flow channel (51).
5. by a kind of production technique that saves the high temperature resistant weldless steel tube of nickel claimed in claim 4, it is characterized in that: the gait of march coming directly towards in described step (3) middle punch technique is 3 meters of per minutes, the take-off rate of lubricating fluid is 0.5 ~ 1 liter of per minute.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105331850A (en) * | 2015-11-10 | 2016-02-17 | 湖州华特不锈钢管制造有限公司 | High-corrosion-resistance nickel-copper alloy seamless pipe and manufacturing method thereof |
| CN105441720A (en) * | 2015-11-10 | 2016-03-30 | 湖州华特不锈钢管制造有限公司 | Copper-nickel alloy seamless tube and manufacturing method thereof |
| CN105834217A (en) * | 2016-03-25 | 2016-08-10 | 江苏武进不锈股份有限公司 | Preparation process of large-diameter duplex stainless steel seamless steel tube and application to oceanographic engineering |
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| CN101612700A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | The preparation method of seamless steel tubes made of martensite precipitation hardening stainless steel |
| CN101691630A (en) * | 2009-09-17 | 2010-04-07 | 苏州贝思特金属制品有限公司 | Method for manufacturing seamless steel tubes |
| CN102274854A (en) * | 2011-08-13 | 2011-12-14 | 四川三洲特种钢管有限公司 | Process for manufacturing superascoloy stainless steel tube |
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| CN101612700A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | The preparation method of seamless steel tubes made of martensite precipitation hardening stainless steel |
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| CN105331850A (en) * | 2015-11-10 | 2016-02-17 | 湖州华特不锈钢管制造有限公司 | High-corrosion-resistance nickel-copper alloy seamless pipe and manufacturing method thereof |
| CN105441720A (en) * | 2015-11-10 | 2016-03-30 | 湖州华特不锈钢管制造有限公司 | Copper-nickel alloy seamless tube and manufacturing method thereof |
| CN105441720B (en) * | 2015-11-10 | 2018-04-24 | 湖州华特不锈钢管制造有限公司 | A kind of corronil seamless pipe and its manufacture method |
| CN105834217A (en) * | 2016-03-25 | 2016-08-10 | 江苏武进不锈股份有限公司 | Preparation process of large-diameter duplex stainless steel seamless steel tube and application to oceanographic engineering |
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