CN106947852A - It is a kind of to improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting - Google Patents
It is a kind of to improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting Download PDFInfo
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- CN106947852A CN106947852A CN201710212010.5A CN201710212010A CN106947852A CN 106947852 A CN106947852 A CN 106947852A CN 201710212010 A CN201710212010 A CN 201710212010A CN 106947852 A CN106947852 A CN 106947852A
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- casting
- wall tube
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- casting blank
- sized heavy
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The method that combined shaping large-sized heavy-wall tube performance is squeezed in casting is improved the present invention relates to a kind of, belongs to large-sized heavy-wall tube performance and improves method and technology field.The present invention solves casting and squeezes the technical problem that drip molding microstructure present in combined shaping large-sized heavy-wall tube technique is uneven, crystallite dimension is excessive.The technical scheme is that：It is a kind of to improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting, wherein：Comprise the following steps：1), alloy melting；2), liquid steel refining；3), rising head casting hollow casting blank；4), hollow casting blank homogenization；5), water under high pressure dephosphorization；6), extrusion forming；7) it is heat-treated after, extruding；8), precision truing.The present invention has the advantages that low cost, intensity are high, plasticity and toughness are good, production efficiency is high.
Description
Technical field
Method and technology field is improved the invention belongs to large-sized heavy-wall tube performance, more particularly to a kind of improve casts crowded compound
Shape the method for large-sized heavy-wall tube performance.
Background technology
With Chinese large-sized supercritical thermal power unit, nuclear power generating sets, petrochemical industry, Aero-Space, ship, high ferro and military project
Etc. the fast development of industry, the demand to large-sized heavy-wall tube increasingly increases.The technological process of traditional mode of production large-sized heavy-wall tube
For：Alloy thawing → liquid steel refining → teeming → cogging → blanking → heating → jumping-up → punching → heating → hot extrusion →
Heat treatment → precision truing, not only technique is tediously long but also stock utilization is low and energy resource consumption is big for this method.Patent No.
ZL201310025737.4《A kind of method of thick-walled seamless steel pipes short route progressive forming》Propose direct using hollow casting blank
Hot-pressed method, its technological process is：Alloy thawing → liquid steel refining → rising head casting hollow casting blank → hot extrusion →
Heat treatment → precision truing.Compared with traditional handicraft, though this method has, technique is simple, stock utilization is high, save energy etc.
Advantage, but due to eliminating cogging, jumping-up and punching technology, cause materials microstructure segregation, loose and plasticity to enter one
The improvement of step, the crystal grain of the large-sized heavy-wall tube of shaping is bigger than normal, and material has center segregation and the defect such as loose, it is difficult to meet core
High performance requirements of the fields such as (fire) electricity, petrochemical industry to large-sized heavy-wall tube.
The content of the invention
Casting is improved there is provided one kind squeeze combined shaping heavy caliber thick wall it is an object of the invention to the shortcoming for overcoming prior art
The method of pipe performance, solves casting and squeezes the inequality of drip molding microstructure present in combined shaping large-sized heavy-wall tube technique, crystal grain
Oversized technical problem.
The present invention is achieved by the following technical solutions：
It is a kind of to improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting, wherein：Comprise the following steps：
1), alloy melting；
2), liquid steel refining；
3), rising head casting hollow casting blank；
4), hollow casting blank homogenization：The pre-heat treatment, heating and all heat-treated are carried out successively to hollow casting blank, its
In：The pre-heat treatment temperature is 900~1000 DEG C, and the pre-heat treatment time is 90min；Heat treatment temperature is 1300 DEG C, at heating
The reason time is 120min；All heat-treated temperature is 1300 DEG C, and all heat-treated soaking time is 40min；
5), water under high pressure dephosphorization：Dephosphorization, hollow casting after dephosphorization are carried out by the hollow casting blank after high pressure water impact homogenization
Base temperature is 1200~1250 DEG C；
6), extrusion forming：Hollow casting blank after dephosphorization is placed on extruder and extruded, initial compression temperature is：
1200~1250 DEG C, extrusion speed is 30~50mm/s, and extrusion ratio is 6~9；
7) it is heat-treated after, extruding：Normalizing and temper are carried out to it successively after the completion of extruding：
1. normalized treatment：1030~1060 DEG C are heated to 10 DEG C/min speed, soaking time is 4~5h, then right
Its air cooling；
2. temper：730~790 DEG C, when soaking time is that normalized treatment is incubated are heated to 10 DEG C/min speed
Between 1.2 times, then to its air cooling；
8), precision truing.
Further, the extruder is vertical steel tube extruder.
The present invention by the homogenization to hollow casting blank, high pressure dephosphorization, extrusion temperature, extrusion speed, extrusion ratio and
The precise control that is heat-treated after squeezing, the large-sized heavy-wall tube crystal grain that eliminates shaping is bigger than normal, material center segregation and loose etc. lack
Fall into；The microstructure transformation of material is realized, lath martensite tissue is obtained, Ostwald curings do not occur and are distributed for carbide
Uniformly, with good intensity and plasticity and toughness, so as to reach the purpose of material forming structure property control.
Compared with prior art, the present invention has the advantages that low cost, intensity are high, plasticity and toughness are good, production efficiency is high.
Brief description of the drawings
Fig. 1 is the process chart of the present invention；
Fig. 2 is Technology for Heating Processing figure after present invention extruding.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1
As depicted in figs. 1 and 2, the side of combined shaping large-sized heavy-wall tube performance is squeezed in a kind of raising casting in the present embodiment
Method, wherein：Comprise the following steps：
1), alloy melting：Using electric arc furnaces melting waste steel, SiAlFe and Al are used as deoxidier；
2), liquid steel refining：Using VODC vacuum refinings, smelting temperature is 1660 DEG C~1710 DEG C；
3), rising head casting hollow casting blank：Refined molten steel is subjected to rising head casting, mold clearing temperature at 1580 DEG C~1620 DEG C
For 1290~1340 DEG C；
4), hollow casting blank homogenization：The pre-heat treatment, heating and all heat-treated are carried out successively to hollow casting blank, its
In：The pre-heat treatment temperature is 900 DEG C, and the pre-heat treatment time is 90min；Heat treatment temperature is 1300 DEG C, heating treatment time
For 120min；All heat-treated temperature is 1300 DEG C, and all heat-treated soaking time is 40min；
5), water under high pressure dephosphorization：Dephosphorization, hollow casting after dephosphorization are carried out by the hollow casting blank after high pressure water impact homogenization
Base temperature is 1200 DEG C；
6), extrusion forming：Hollow casting blank after dephosphorization is placed on extruder and extruded, initial compression temperature is：
1200 DEG C, extrusion speed is 30mm/s, and extrusion ratio is 6；
7) it is heat-treated after, extruding：Normalizing and temper are carried out to it successively after the completion of extruding：
1. normalized treatment：1030 DEG C are heated to 10 DEG C/min speed, soaking time is 4h, then to its air cooling；
2. temper：730 DEG C are heated to 10 DEG C/min speed, soaking time is 4.8h, then to its air cooling；
8), precision truing：Alignment is carried out to large-sized heavy-wall tube, inside and outside wall oxide skin and excess stock is removed, cleaning is big
Bore thick-walled pipe, steeps aqueous rust preventive and drains.
Further, the extruder is vertical steel tube extruder.
The present embodiment selects P91 steel, and the seamless steel pipe size requirement of extrusion molding is：External diameter φ 500~φ 1200mm, wall
Thickness 40~150mm, 8000~12000mm of length.
Embodiment 2
As depicted in figs. 1 and 2, the side of combined shaping large-sized heavy-wall tube performance is squeezed in a kind of raising casting in the present embodiment
Method, wherein：Comprise the following steps：
1), alloy melting：Using electric arc furnaces melting waste steel, SiAlFe and Al are used as deoxidier；
2), liquid steel refining：Using VODC vacuum refinings, smelting temperature is 1660 DEG C~1710 DEG C；
3), rising head casting hollow casting blank：Refined molten steel is subjected to rising head casting, mold clearing temperature at 1580 DEG C~1620 DEG C
For 1290~1340 DEG C；
4), hollow casting blank homogenization：The pre-heat treatment, heating and all heat-treated are carried out successively to hollow casting blank, its
In：The pre-heat treatment temperature is 1000 DEG C, and the pre-heat treatment time is 90min；Heat treatment temperature is 1300 DEG C, heating treatment time
For 120min；All heat-treated temperature is 1300 DEG C, and all heat-treated soaking time is 40min；
5), water under high pressure dephosphorization：Dephosphorization, hollow casting after dephosphorization are carried out by the hollow casting blank after high pressure water impact homogenization
Base temperature is 1250 DEG C；
6), extrusion forming：Hollow casting blank after dephosphorization is placed on extruder and extruded, initial compression temperature is：
1250 DEG C, extrusion speed is 50mm/s, and extrusion ratio is 9；
7) it is heat-treated after, extruding：Normalizing and temper are carried out to it successively after the completion of extruding：
1. normalized treatment：1060 DEG C are heated to 10 DEG C/min speed, soaking time is 5h, then to its air cooling；
2. temper：790 DEG C are heated to 10 DEG C/min speed, soaking time is 6h, then to its air cooling；
8), precision truing：Alignment is carried out to large-sized heavy-wall tube, inside and outside wall oxide skin and excess stock is removed, cleaning is big
Bore thick-walled pipe, steeps aqueous rust preventive and drains.
Further, the extruder is vertical steel tube extruder.
The present embodiment selects P91 steel, and the seamless steel pipe size requirement of extrusion molding is：External diameter φ 500~φ 1200mm, wall
Thickness 40~150mm, 8000~12000mm of length.
Embodiment 3
As depicted in figs. 1 and 2, the side of combined shaping large-sized heavy-wall tube performance is squeezed in a kind of raising casting in the present embodiment
Method, wherein：Comprise the following steps：
1), alloy melting：Using electric arc furnaces melting waste steel, SiAlFe and Al are used as deoxidier；
2), liquid steel refining：Using VODC vacuum refinings, smelting temperature is 1660 DEG C~1710 DEG C；
3), rising head casting hollow casting blank：Refined molten steel is subjected to rising head casting, mold clearing temperature at 1580 DEG C~1620 DEG C
For 1290~1340 DEG C；
4), hollow casting blank homogenization：The pre-heat treatment, heating and all heat-treated are carried out successively to hollow casting blank, its
In：The pre-heat treatment temperature is 950 DEG C, and the pre-heat treatment time is 90min；Heat treatment temperature is 1300 DEG C, heating treatment time
For 120min；All heat-treated temperature is 1300 DEG C, and all heat-treated soaking time is 40min；
5), water under high pressure dephosphorization：Dephosphorization, hollow casting after dephosphorization are carried out by the hollow casting blank after high pressure water impact homogenization
Base temperature is 1225 DEG C；
6), extrusion forming：Hollow casting blank after dephosphorization is placed on extruder and extruded, initial compression temperature is：
1225 DEG C, extrusion speed is 40mm/s, and extrusion ratio is 7；
7) it is heat-treated after, extruding：Normalizing and temper are carried out to it successively after the completion of extruding：
1. normalized treatment：1050 DEG C are heated to 10 DEG C/min speed, soaking time is 5h, then to its air cooling；
2. temper：760 DEG C are heated to 10 DEG C/min speed, soaking time is 6h, then to its air cooling；
8), precision truing：Alignment is carried out to large-sized heavy-wall tube, inside and outside wall oxide skin and excess stock is removed, cleaning is big
Bore thick-walled pipe, steeps aqueous rust preventive and drains.
Further, the extruder is vertical steel tube extruder.
The present embodiment selects P91 steel, and the seamless steel pipe size requirement of extrusion molding is：External diameter φ 500~φ 1200mm, wall
Thickness 40~150mm, 8000~12000mm of length.
The present invention can be embodied without departing from the spiritual or substantive of invention in a variety of forms, it should therefore be appreciated that on
State embodiment and be not limited to foregoing details, and should widely be explained in claim limited range, therefore fall into right
It is required that or the change in its equivalent scope and remodeling all should be claim and covered.
Claims (2)
1. a kind of improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting, it is characterised in that：Comprise the following steps：
1), alloy melting；
2), liquid steel refining；
3), rising head casting hollow casting blank；
4), hollow casting blank homogenization：The pre-heat treatment, heating and all heat-treated are carried out successively to hollow casting blank, wherein：In advance
Heat treatment temperature is 900~1000 DEG C, and the pre-heat treatment time is 90min；Heat treatment temperature is 1300 DEG C, heating treatment time
For 120min；All heat-treated temperature is 1300 DEG C, and all heat-treated soaking time is 40min；
5), water under high pressure dephosphorization：Dephosphorization, hollow casting blank temperature after dephosphorization are carried out by the hollow casting blank after high pressure water impact homogenization
Spend for 1200~1250 DEG C；
6), extrusion forming：Hollow casting blank after dephosphorization is placed on extruder and extruded, initial compression temperature is：1200
~1250 DEG C, extrusion speed is 30~50mm/s, and extrusion ratio is 6~9；
7) it is heat-treated after, extruding：Normalizing and temper are carried out to it successively after the completion of extruding：
1. normalized treatment：1030~1060 DEG C are heated to 10 DEG C/min speed, soaking time is 4~5h, then empty to it
It is cold；
2. temper：730~790 DEG C are heated to 10 DEG C/min speed, soaking time is normalized treatment soaking time
1.2 times, then to its air cooling；
8), precision truing.
2. according to claim 1 improve the method that combined shaping large-sized heavy-wall tube performance is squeezed in casting, it is characterised in that：Institute
Extruder is stated for vertical steel tube extruder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212010.5A CN106947852B (en) | 2017-04-01 | 2017-04-01 | A method of it improves to cast and squeezes combined shaping large-sized heavy-wall tube performance |
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|---|---|---|---|
| CN201710212010.5A CN106947852B (en) | 2017-04-01 | 2017-04-01 | A method of it improves to cast and squeezes combined shaping large-sized heavy-wall tube performance |
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| CN106947852A true CN106947852A (en) | 2017-07-14 |
| CN106947852B CN106947852B (en) | 2019-05-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950148A (en) * | 2018-07-30 | 2018-12-07 | 钢铁研究总院 | Improve G115 steel large-sized heavy-wall tube radially tissue and performance uniformity method |
| CN109092922A (en) * | 2018-07-18 | 2018-12-28 | 太原科技大学 | A kind of large-sized heavy-wall tube casts the design method of crowded composite forming die type chamber |
| CN113736977A (en) * | 2021-11-05 | 2021-12-03 | 太原科技大学 | Thick-wall straight welded pipe heat treatment device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6191328A (en) * | 1984-10-12 | 1986-05-09 | Nippon Steel Corp | Manufacture of austenitic stainless steel pipe for high temperature |
| CN1831411A (en) * | 2006-04-05 | 2006-09-13 | 河北宏润管道集团有限公司 | Manufacturing method of seamless steel pipe for pressure pipeline |
| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN103056183A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Thick-walled seamless steel tube short process casting and squeezing continuous formation method |
| CN103447760A (en) * | 2013-08-12 | 2013-12-18 | 新兴铸管股份有限公司 | Manufacturing method of N08028 seamless alloy steel pipe |
| CN104043672A (en) * | 2014-04-10 | 2014-09-17 | 内蒙古北方重工业集团有限公司 | Manufacturing method of high-quality P92 large-aperture thick-wall seamless steel pipe of ultra-supercritical unit |
-
2017
- 2017-04-01 CN CN201710212010.5A patent/CN106947852B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6191328A (en) * | 1984-10-12 | 1986-05-09 | Nippon Steel Corp | Manufacture of austenitic stainless steel pipe for high temperature |
| CN1831411A (en) * | 2006-04-05 | 2006-09-13 | 河北宏润管道集团有限公司 | Manufacturing method of seamless steel pipe for pressure pipeline |
| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN103056183A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Thick-walled seamless steel tube short process casting and squeezing continuous formation method |
| CN103447760A (en) * | 2013-08-12 | 2013-12-18 | 新兴铸管股份有限公司 | Manufacturing method of N08028 seamless alloy steel pipe |
| CN104043672A (en) * | 2014-04-10 | 2014-09-17 | 内蒙古北方重工业集团有限公司 | Manufacturing method of high-quality P92 large-aperture thick-wall seamless steel pipe of ultra-supercritical unit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092922A (en) * | 2018-07-18 | 2018-12-28 | 太原科技大学 | A kind of large-sized heavy-wall tube casts the design method of crowded composite forming die type chamber |
| CN108950148A (en) * | 2018-07-30 | 2018-12-07 | 钢铁研究总院 | Improve G115 steel large-sized heavy-wall tube radially tissue and performance uniformity method |
| CN113736977A (en) * | 2021-11-05 | 2021-12-03 | 太原科技大学 | Thick-wall straight welded pipe heat treatment device and method |
| CN113736977B (en) * | 2021-11-05 | 2022-02-01 | 太原科技大学 | Thick-wall straight welded pipe heat treatment device and method |
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