CN102586569A - Heat treatment process for TP310Cb/T11 bimetal composite tube - Google Patents
Heat treatment process for TP310Cb/T11 bimetal composite tube Download PDFInfo
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- CN102586569A CN102586569A CN2012100836635A CN201210083663A CN102586569A CN 102586569 A CN102586569 A CN 102586569A CN 2012100836635 A CN2012100836635 A CN 2012100836635A CN 201210083663 A CN201210083663 A CN 201210083663A CN 102586569 A CN102586569 A CN 102586569A
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Abstract
The invention discloses a heat treatment process for a TP310Cb/T11 bimetal composite tube and belongs to the field of heat treatment of metal materials. An inner layer material of the composite tube is T11, and an outer layer material is TP310Cb. The heat treatment process comprises the steps that 1 one end of the bimetal composite tube is plugged, and a lifting lug is welded to the other end of the bimetal composite tube; 2 one end of the bimetal composite tube is hung through the lifting lug, a fireproof material is added into one opening end of the bimetal composite tube, the bimetal composite tube is filled with the fireproof material, and the opening end is plugged; and 3 the bimetal composite tube is heated to 1,050-1,100 DEG C in a pit type furnace, heat is preserved for 1-2h, and finally the bimetal composite tube is cooled to the normal temperature. The heat treatment process is provided to solve the problems that the heat treatment holding temperatures of an inner layer and an outer layer of the bimetal composite tube are different, and the cooling speeds after heat treatment are different. The heat treatment process meets the requirements of normalizing and tempering heat treatment of the inner layer while achieving solution treatment of the outer layer, and can avoid oxidation of the inner layer T11 in the heat treatment process.
Description
Technical field
The present invention relates to a kind of thermal treatment process that is used for the double metallic composite material of boiler superheater pipeline, belong to metallic substance thermal treatment field, especially a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process.
Background technology
Composite bimetal pipe is after dissolving the casting alloy of two kinds of heterogeneities, different performance respectively, adopts centre spinning method successively to pour in the same casting mold, makes it to become the complete composite bimetal pipe that can satisfy request for utilization.Its ectonexine has different performances, and its base layer (internal layer) alloy has higher mechanical property usually, and coating (skin) alloy then has properties such as wear-resistant, corrosion-resistant.
The TP310Cb/T11 composite bimetal pipe is a boiler superheater pipeline material, is mainly used in the heat exchanger that has aggressive atmosphere.Outer TP310Cb is the high Ni stainless material of a kind of high Cr, is mainly used in anticorrosionly, and its thermal conductivity is less, and effectiveness of heat exchanger is lower, and internal layer T11 is a kind of low alloy material, is mainly used in to bear hot strength and increase effect such as thermal conduction.TP310Cb/T11 bimetal composite finished product outer tube layer thickness 1-2mm, interior layer thickness 3-5mm.
The ectonexine composition of composite bimetal pipe will be asked for an interview to table 1.In the use, the outer main erosion resistance of stressing, internal layer is mainly stressed mechanical property, the performance requriements of standard-required is seen table 2.
The requirement of table 1 ectonexine ingredient standard
Composition from last table requires to find out that outer field TP310Cb controls to C content below 0.03% in order to increase erosion resistance, and in order to reduce the work hardening in cold rolling.
The requirement of table 2 internal layer standard of performance
| Ys MPa | Tensile strength MPa | Unit elongation % |
| ≥205 | ≥415 | ≥30 |
TP310Cb/T11 composite bimetal pipe skin is a stainless steel; Require corrosion-resistance treatment, that is to say, before the multiunit tube finished product, need carry out solution treatment; This is a stainless steel rot-resistant thermal treatment process commonly used; Purpose is to reduce the carbide of the chromium in the stainless steel tissue, reduces the segregation of chromium, increases erosion resistance.Outer TP310Cb solid solution treatment process is: 1050-1150 ℃ of insulation certain hour, the rapid hardening cooling of coming out of the stove then.
Internal layer T11 is in order to satisfy performance requriements, and the thermal treatment process of material is generally normalizing+tempering.970 ± 10 ℃ of normalizing temperatures, air cooling behind the insulation certain hour, tempering temperature is 720 ± 10 ℃, air cooling behind the insulation certain hour.
Be not difficult to find from above-mentioned thermal treatment process contrast; The skin of TP310Cb/T11 composite bimetal pipe and internal layer are because material different, and its thermal treatment holding temperature is different, and the speed of cooling after the thermal treatment is different; Contradiction is the most; The tempering temperature of internal layer T11 just in time is outer stainless sensitizing temperature, and when this temperature long-time heating, stainless corrosion resistance nature reduces greatly.
Generally speaking, setting about from the composition of material, change the composition of outer material, is main with the thermal treatment process of internal layer.That is to say, reduce the C content of outer TP310Cb, when C content was lower than 0.02%, stainless steel can not have considerable influence to the erosion resistance of itself immediately at sensitization temperature ranges internal heating yet.But the smelting of Ultralow Carbon Stainless Steel needs refining treatment, will inevitably increase the molten steel smelting cost, thereby increases the production cost of multiunit tube.
Summary of the invention
The technical problem that the present invention will solve provides a kind of composite bimetal pipe thermal treatment process; This technology is different to the thermal treatment holding temperature of the ectonexine of composite bimetal pipe; Speed of cooling after the thermal treatment is different and propose, and the present invention had both satisfied outer field corrosion-resistant requirement, satisfied the mechanical property requirement of internal layer again; Can also prevent the oxidation in thermal treatment heat-processed, reduce the production cost of multiunit tube.
For solving the problems of the technologies described above; The technical scheme that the present invention taked is: a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process; The internal layer material of wherein said multiunit tube is T11, and outer material is TP310Cb, it is characterized in that said technology comprises following concrete steps:
(1) with an end shutoff of composite bimetal pipe, another opening end welds hanger;
(2) utilize the hanger suspension to an end of composite bimetal pipe, add refractory materials at opening end, make refractory materials be full of composite bimetal pipe, the pairs of openings end carries out shutoff;
(3) to composite bimetal pipe in heat treatment furnace internal heating to 1050 ~ 1100 degree centigrade, be incubated then, be cooled to normal temperature at last.
Such scheme is done further restriction, and the refractory materials in the said step 2 is a high-alumina fly.
Such scheme is done further restriction, after the opening end of the inherent composite bimetal pipe of said step 2 adds refractory materials, at refractory surface covering one deck reductive agent of opening part.Can not contain the C element in the reductive agent among the present invention, because outer field TP310Cb erosion resistance, can the content of C be controlled, therefore can not in reductive agent, reduce C.
Such scheme is done further restriction, and said reductive agent is silicon calcium powder and/or ferrosilicon powder.
Such scheme is done further restriction, and soaking time was controlled at 1 ~ 2 hour in the said step 3.
Such scheme is done further restriction, and the type of cooling in the said step 3 is an air cooling, air-cooled or mist is cold.The type of cooling is according to selecting season among the present invention, and with air-cooled or mist is cold effective, speed of cooling is fast, uses air cooling during winter, and is practical during summer.
Adopt the beneficial effect that technique scheme produced to be: the present invention improves original composite bimetal pipe thermal treatment process, through in pipe, adding a large amount of refractory materialss, the accumulation of heat in a large number when thermal treatment heating and insulation of this refractory materials; Can from inside to outside dispel the heat in a long time; Internal layer is thicker, is under the heat transfer state, and internal layer is near comparatively high temps state (temperature is the high tempering temperature) for a long time; Also just reduced its speed of cooling; Outer stainless steel thin thickness can be under the subcooling condition always, can reach the purpose of solution treatment; When therefore can make skin reach solution treatment, internal layer satisfies normalizing and tempered heat treatment requirements; In addition, added a little reductive agent, be layed in the refractory surface at mouth of pipe place, can protect the multiunit tube internal surface to avoid oxidation and decarbonization at the mouth of pipe of composite bimetal pipe.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
The TP310Cb/T11 sample hose is of a size of outer TP310Cb thickness 1.5mm, and internal layer T11 thickness is 3.5mm, external diameter 50mm, 3 meters of length.Thermal treatment process measure according to above-mentioned is heat-treated, and has reached outer solution treatment and has improved corrosion resistance, and the internal layer slow cooling reaches performance requriements.
One end of pipe is stifled with the baffle plate weldering, the other end welded suspending hook, the mixture of pack in the pipe high-alumina fly, silicon calcium powder and ferrosilicon powder, the ferrosilicon powder after the topmost of these powders is packed 30～50mm into clogs with the refractory pebbles cotton, fully prevents the inner surface of tube oxidation.Then, hang in pit furnace, be heated to 1050～1100 ℃, be incubated 1～2 hour, air-cooled, the air cooling in back of coming out of the stove hockets, the control hull-skin temperature about 650～750, stop after 10 minutes air-cooled, free air cooling.
Outer TP310Cb intergranular corrosion is qualified, and the internal layer grain fineness number meets the demands, and mechanical property sees the following form, and satisfies performance requriements.
Internal layer performance after table 3 thermal treatment
| Ys MPa | Tensile strength MPa | Unit elongation % |
| 285 | 495 | 33 |
From last table, through the TP310Cb/T11 composite bimetal pipe of this explained hereafter, after outer solution treatment, internal layer can reach normalizing+tempered heat treatment requirements, satisfies the requirement of mechanical property, makes composite bimetal pipe satisfy request for utilization.
Claims (6)
1. TP310Cb/T11 composite bimetal pipe thermal treatment process, the internal layer material of wherein said multiunit tube is T11, outer material is TP310Cb, it is characterized in that said technology comprises following concrete steps:
(1) with an end shutoff of composite bimetal pipe, another opening end welds hanger;
(2) utilize the hanger suspension to an end of composite bimetal pipe, add refractory materials at opening end, make refractory materials be full of composite bimetal pipe, the pairs of openings end carries out shutoff;
(3) to composite bimetal pipe in heat treatment furnace internal heating to 1050 ~ 1100 degree centigrade, be incubated then, be cooled to normal temperature at last.
2. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 1 is characterized in that the refractory materials in the said step 2 is a high-alumina fly.
3. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 1 after the opening end that it is characterized in that the inherent composite bimetal pipe of said step 2 adds refractory materials, covers one deck reductive agent at the refractory surface of opening part.
4. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 3 is characterized in that said reductive agent is silicon calcium powder and/or ferrosilicon powder.
5. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 1 is characterized in that soaking time was controlled at 1 ~ 2 hour in the said step 3.
6. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 1,, it is characterized in that the type of cooling in the said step 3 is an air cooling, air-cooled or mist is cold.
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| CN 201210083663 CN102586569B (en) | 2012-03-27 | 2012-03-27 | Heat treatment process for TP310Cb/T11 bimetal composite tube |
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| CN 201210083663 CN102586569B (en) | 2012-03-27 | 2012-03-27 | Heat treatment process for TP310Cb/T11 bimetal composite tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899466A (en) * | 2012-09-27 | 2013-01-30 | 攀钢集团成都钢钒有限公司 | Processing method for preventing inner surface oxidization of steel pipe during heat treatment |
| CN108754095A (en) * | 2018-09-12 | 2018-11-06 | 上海电气核电设备有限公司 | A kind of method for preventing threaded hole from aoxidizing when heat treatment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10265852A (en) * | 1997-03-27 | 1998-10-06 | Kubota Corp | Production of double layer tube excellent in corrosion resistance, strength, toughness and the like |
| CN101530907A (en) * | 2009-02-17 | 2009-09-16 | 新兴铸管股份有限公司 | Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof |
| CN101804450A (en) * | 2010-04-08 | 2010-08-18 | 新兴铸管股份有限公司 | 20/321H corrosion-resisting double-metal composite tube and manufacturing process thereof |
| CN102039326A (en) * | 2009-10-15 | 2011-05-04 | 北京长兴凯达复合材料科技发展有限公司 | Method for preparing bimetallic seamless steel pipe for alkali recovery boiler |
-
2012
- 2012-03-27 CN CN 201210083663 patent/CN102586569B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10265852A (en) * | 1997-03-27 | 1998-10-06 | Kubota Corp | Production of double layer tube excellent in corrosion resistance, strength, toughness and the like |
| CN101530907A (en) * | 2009-02-17 | 2009-09-16 | 新兴铸管股份有限公司 | Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof |
| CN102039326A (en) * | 2009-10-15 | 2011-05-04 | 北京长兴凯达复合材料科技发展有限公司 | Method for preparing bimetallic seamless steel pipe for alkali recovery boiler |
| CN101804450A (en) * | 2010-04-08 | 2010-08-18 | 新兴铸管股份有限公司 | 20/321H corrosion-resisting double-metal composite tube and manufacturing process thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899466A (en) * | 2012-09-27 | 2013-01-30 | 攀钢集团成都钢钒有限公司 | Processing method for preventing inner surface oxidization of steel pipe during heat treatment |
| CN102899466B (en) * | 2012-09-27 | 2014-12-17 | 攀钢集团成都钢钒有限公司 | Processing method for preventing inner surface oxidization of steel pipe during heat treatment |
| CN108754095A (en) * | 2018-09-12 | 2018-11-06 | 上海电气核电设备有限公司 | A kind of method for preventing threaded hole from aoxidizing when heat treatment |
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| CN102586569B (en) | 2013-07-31 |
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