CN102586569B - Heat treatment process for TP310Cb/T11 bimetal composite tube - Google Patents

Heat treatment process for TP310Cb/T11 bimetal composite tube Download PDF

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Publication number
CN102586569B
CN102586569B CN 201210083663 CN201210083663A CN102586569B CN 102586569 B CN102586569 B CN 102586569B CN 201210083663 CN201210083663 CN 201210083663 CN 201210083663 A CN201210083663 A CN 201210083663A CN 102586569 B CN102586569 B CN 102586569B
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China
Prior art keywords
tp310cb
composite bimetal
bimetal pipe
heat treatment
composite tube
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CN 201210083663
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CN102586569A (en
Inventor
范新有
于满
武贤
宋延琦
申勇
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Xinxing Ductile Iron Pipes Co Ltd
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Xinxing Ductile Iron Pipes Co Ltd
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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

A kind of TP310Cb/T11 composite bimetal pipe thermal treatment process
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 the casting alloy of two kinds of heterogeneities, different performance is dissolved 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 service requirements.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 requires to see Table 1.In the use, skin is mainly emphasized erosion resistance, and internal layer is mainly emphasized mechanical property, and the performance requriements of standard-required sees Table 2.
The requirement of table 1 ectonexine ingredient standard
Composition from last table requires as can be seen, and 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
Yield strength 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 multiple-unit tube finished product, need to 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, its thermal treatment holding temperature difference, speed of cooling difference after the thermal treatment, 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, set about, change the composition of outer material, based on the thermal treatment process of internal layer from the composition of material.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 multiple-unit tube.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of composite bimetal pipe thermal treatment process, this technology is the thermal treatment holding temperature difference at the ectonexine of composite bimetal pipe, speed of cooling after the thermal treatment is different and propose, the present invention had both satisfied outer field corrosion-resistant requirement, satisfy the mechanical property requirement of internal layer again, can also prevent the oxidation in thermal treatment heat-processed, reduce the production cost of multiple-unit tube.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process, the internal layer material of wherein said multiple-unit tube is T11, and outer material is TP310Cb, it is characterized in that described technology comprises following concrete steps:
(1) with an end shutoff of composite bimetal pipe, another opening end welds hanger;
(2) utilize an end of composite bimetal pipe hanger to hang, add refractory materials, make refractory materials be full of composite bimetal pipe, opening end is carried out shutoff at opening end;
(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 described step 2 is a high-alumina fly.
Such scheme is done further restriction, after the opening end of the inherent composite bimetal pipe of described 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 need the content of C is controlled, therefore can not in reductive agent, reduce C.
Such scheme is done further restriction, and described 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 described step 3.
Such scheme is done further restriction, and the type of cooling in the described 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, by 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, be under the heat transfer state, 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 multiple-unit tube internal surface to avoid oxidation and decarbonization at the mouth of pipe of composite bimetal pipe.
Embodiment
The present invention is further detailed explanation below in conjunction with embodiment.
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.Heat-treat according to above-mentioned thermal treatment process measure, reached outer solution treatment and improved corrosion resistance, 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
Yield strength MPa Tensile strength MPa Unit elongation %
285 495 33
From last table, by 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 service requirements.

Claims (5)

1. TP310Cb/T11 composite bimetal pipe thermal treatment process, the internal layer material of wherein said multiple-unit tube is T11, outer material is TP310Cb, it is characterized in that described technology comprises following concrete steps:
(1) with an end shutoff of composite bimetal pipe, another opening end welds hanger;
(2) utilize an end of composite bimetal pipe hanger to hang, add high-alumina fly, make high-alumina fly be full of composite bimetal pipe, opening end is carried out shutoff at opening end;
(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 after the opening end that it is characterized in that the inherent composite bimetal pipe of described step 2 adds high-alumina fly, at high-alumina fly surface coverage one deck reductive agent of opening part.
3. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 2 is characterized in that described reductive agent is silicon calcium powder and/or ferrosilicon powder.
4. 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 described step 3.
5. a kind of TP310Cb/T11 composite bimetal pipe thermal treatment process according to claim 1 is characterized in that the type of cooling in the described step 3 is an air cooling, air-cooled or mist is cold.
CN 201210083663 2012-03-27 2012-03-27 Heat treatment process for TP310Cb/T11 bimetal composite tube Expired - Fee Related CN102586569B (en)

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Publication number Priority date Publication date Assignee Title
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
CN108754095B (en) * 2018-09-12 2020-05-29 上海电气核电设备有限公司 Method for preventing threaded hole from being oxidized during heat treatment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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