CN103789706A - High temperature resistant steel pipe material and preparation method thereof - Google Patents
High temperature resistant steel pipe material and preparation method thereof Download PDFInfo
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- CN103789706A CN103789706A CN201410018615.7A CN201410018615A CN103789706A CN 103789706 A CN103789706 A CN 103789706A CN 201410018615 A CN201410018615 A CN 201410018615A CN 103789706 A CN103789706 A CN 103789706A
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- steel pipe
- pipe material
- tube material
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- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 title abstract description 16
- 239000010959 steel Substances 0.000 title abstract description 16
- 238000007670 refining Methods 0.000 claims abstract description 17
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 9
- IKNAJTLCCWPIQD-UHFFFAOYSA-K cerium(3+);lanthanum(3+);neodymium(3+);oxygen(2-);phosphate Chemical compound [O-2].[La+3].[Ce+3].[Nd+3].[O-]P([O-])([O-])=O IKNAJTLCCWPIQD-UHFFFAOYSA-K 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052590 monazite Inorganic materials 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000007669 thermal treatment Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 239000012467 final product Substances 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 2
- 230000023556 desulfurization Effects 0.000 abstract description 2
- 230000003064 anti-oxidating effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a high temperature resistant steel pipe material, which comprises the following chemical elements in percentage by weight: 0.08-0.11% of C, 1.4-1.6% of W, 0.02-0.04% of Sb, 0.7-1.0% of Mn, 0.6-0.9% of Si, 0.02-0.04% of Hf, 0.2-0.5% of Mo, 0.2-0.4% of Co, 0.02-0.03% of Ta, 0-0.015% of P, 0-0.002% of S, and the balance being Fe and inevitable impurity. The steel pipe material has the characteristics of high strength, good high-temperature resistance, good wear resistance, large conduction coefficient, small expansion coefficient, good anti-oxidation and good stress corrosion, and can be widely applied to high-temperature parts and fasteners. The heat process temperature is reasonably controlled, so as to improve the comprehensive mechanical property of the steel pipe material. A refining agent can fully perform the physicochemical reaction with the molten steel, thereby achieving deoxidation, desulfurization, dephosphorization and improvements of state of inclusions, and improving the purity of steel, the metal yield rate and the yield of steel tubes.
Description
Technical field
The present invention relates to field of alloy material, relate in particular to a kind of high temperaturesteel tube material and preparation method thereof.
Background technology
Steel pipe is not only for delivery of fluid and powdery solid, exchange heat energy, manufacturing machine part and container, it or a kind of economic steel.Manufacture from people's daily apparatus, furniture, water supply and sewage, air feed, ventilation and heating facility to various agricultural machinery apparatus, exploitation, national defence and the space flight firearms used of subterranean resource, bullet, guided missile, rocket etc. all be unable to do without steel pipe.
Along with production technology is constantly progressive, the raising of living standards of the people, specification of quality to steel pipe is more and more higher, not only require have higher intensity, hardness, erosion resistance, wear resistance, high temperature resistant, good springiness, counter-bending, shock-resistant, good toughness, be difficult for occurring crackle, improve safety performance, but also need to there is good processibility, reduce Financial cost, improve the competitive power of product, also need further to improve the quality of steel pipe, especially research and develop the tube material of different performances for different purposes.
Summary of the invention
The object of the present invention is to provide a kind of high temperaturesteel tube material and preparation method thereof, this tube material has that intensity is high, high temperature resistant, wear-resisting, thermal conductivity is large, the feature such as the coefficient of expansion is little, good in oxidation resistance, stress corrosion resistant are good.
Technical scheme of the present invention is as follows:
A kind of high temperaturesteel tube material, is characterized in that: chemical element composition and mass percent thereof that it contains are: C 0.08-0.11, W1.4-1.6, Sb0.02-0.04, Mn0.7-1.0, Si0.6-0.9, Hf0.02-0.04, Mo0.2-0.5, Co0.2-0.4, Ta0.02-0.03, P≤0.015, S≤0.002, surplus are Fe and inevitable impurity.
The production method of described high temperaturesteel tube material, is characterized in that comprising the following steps:
(1) pig iron is sent into and in stove, added refining agent and carry out initial refining, add alloying constituent, add refining agent and carry out secondary refining, survey and adjust chemical element component content to qualified, vacuum outgas, continuous casting circular tube blank, then carry out anneal, make blank;
(2) in alloying process, first alloy and the pig iron are cast to alloy block, then throw in batches; The composition of alloy block and release sequence are (1) Mn, Si, Fe; (2) W, Mo, Fe; (3) other alloying elements and Fe; Input interlude is 25-28 minute, and after throwing in, Argon stirs;
(3) add hot piercing, described blank heating is bored a hole at 1155-1165 ℃, obtain pipe, and control punch excentricity is less than 7%;
(4) thermal treatment.
Described thermal treatment is: pipe is heated to 760-770 ℃ with 23-25 ℃/s speed, and insulation 30-40 minute, then be heated to 1020-1030 ℃ with 25-27 ℃/s speed, insulation 7-9 minute; Cool to 50-90 ℃ with 240-260 ℃/h of speed again; Be heated to 930-940 ℃ with 23-25 ℃/s speed again, insulation 1-1.5 hour, again with 230-240 ℃/s speed spraying cooling to 320-330 ℃, again with 200-210 ℃/s speed spraying cooling to 80-100 ℃, be heated to 580-590 ℃ with 20-22 ℃/s speed again, insulation 2-3 hour, takes out air cooling and get final product.
Described refining agent is made up of the raw material of following weight part: scrap iron powder 20-24, nano titanium oxide 0.5-1, nano mica powder 0.5-1, monazite 3-5, barium oxide 2-4, calcium oxide 6-8, chromium sesquioxide 2-4, expanded graphite 4-6; Preparation method pulverizes monazite, is heated to molten state with scrap iron powder, adds monazite, barium oxide, calcium oxide, chromium sesquioxide, expanded graphite to stir, degassed in a vacuum; Gained powder is pressed into base under 0.7-1Kpa, then, at 1210-1240 ℃, calcines 1-2 hour, cooling after, then be ground into 100-200 order powder, mix with other remaining components, to obtain final product.
Beneficial effect of the present invention
Tube material of the present invention has added the elements such as W, Mo, Co, Sb, Ta, this steel pipe has that intensity is high, high temperature resistant, wear-resisting, thermal conductivity is large, the feature such as the coefficient of expansion is little, good in oxidation resistance, stress corrosion resistant are good, can be widely used in high-temperature component, fastening piece etc.; By reasonable control thermal treatment temp, improve the comprehensive mechanical property of tube material, improve safety coefficient; Refining agent of the present invention can carry out abundant physical reaction with molten steel, reaches deoxidation, desulfurization, dephosphorization, improves inclusion morphology object, improves the purity of steel, and recovery rate of iron and Tube yield are improved.
Embodiment
A kind of high temperaturesteel tube material, chemical element composition and mass percent thereof that it contains are: C 0.08-0.11, W1.4-1.6, Sb0.02-0.04, Mn0.7-1.0, Si0.6-0.9, Hf0.02-0.04, Mo0.2-0.5, Co0.2-0.4, Ta0.02-0.03, P≤0.015, S≤0.002, surplus are Fe and inevitable impurity.
The production method of described high temperaturesteel tube material, comprises the following steps:
(1) pig iron is sent into and in stove, added refining agent and carry out initial refining, add alloying constituent, add refining agent and carry out secondary refining, survey and adjust chemical element component content to qualified, vacuum outgas, continuous casting circular tube blank, then carry out anneal, make blank;
(2) in alloying process, first alloy and the pig iron are cast to alloy block, then throw in batches; The composition of alloy block and release sequence are (1) Mn, Si, Fe; (2) W, Mo, Fe; (3) other alloying elements and Fe; Throwing in interlude is 27 minutes, and after throwing in, Argon stirs;
(3) add hot piercing, by perforation at described blank heating to 1160 ℃, obtain pipe, and control punch excentricity is less than 7%;
(4) thermal treatment.
Described thermal treatment is: pipe is heated to 765 ℃ with 24 ℃/s speed, is incubated 35 minutes, then be heated to 1025 ℃ with 26 ℃/s speed, be incubated 8 minutes; Cool to 70 ℃ with 250 ℃/h of speed again; Be heated to 935 ℃ with 24 ℃/s speed again, be incubated 1.3 hours, then with 235 ℃/s speed spraying cooling to 325 ℃, then with 205 ℃/s speed spraying cooling to 90 ℃, then be heated to 585 ℃ with 21 ℃/s speed, and be incubated 2.5 hours, take out air cooling and get final product.
Described refining agent by following weight part (kilogram) raw material make: scrap iron powder 22, nano titanium oxide 0.7, nano mica powder 0.8, monazite 4, barium oxide 3, calcium oxide 7, chromium sesquioxide 3, expanded graphite 5; Preparation method pulverizes monazite, is heated to molten state with scrap iron powder, adds monazite, barium oxide, calcium oxide, chromium sesquioxide, expanded graphite to stir, degassed in a vacuum; Gained powder is pressed into base under 0.8Kpa, then, at 1230 ℃, calcines 1.5 hours, cooling after, then be ground into 150 order powder, mix with other remaining components, to obtain final product.
Adopt the high temperaturesteel tube material of the present embodiment to make the steel pipe that wall thickness is 4.2mm, can bear more than 20Mpa pressure and booster not, yield strength 740MPa, tensile strength is at 850MPa, hardness (HV) 246, impact absorbing energy 56J, impelling strength 64J/cm2, unit elongation 16.7%.
Claims (4)
1. a high temperaturesteel tube material, is characterized in that: chemical element composition and mass percent thereof that it contains are: C 0.08-0.11, W1.4-1.6, Sb0.02-0.04, Mn0.7-1.0, Si0.6-0.9, Hf0.02-0.04, Mo0.2-0.5, Co0.2-0.4, Ta0.02-0.03, P≤0.015, S≤0.002, surplus are Fe and inevitable impurity.
2. the production method of high temperaturesteel tube material according to claim 1, is characterized in that comprising the following steps:
(1) pig iron is sent into and in stove, added refining agent and carry out initial refining, add alloying constituent, add refining agent and carry out secondary refining, survey and adjust chemical element component content to qualified, vacuum outgas, continuous casting circular tube blank, then carry out anneal, make blank;
(2) in alloying process, first alloy and the pig iron are cast to alloy block, then throw in batches; The composition of alloy block and release sequence are (1) Mn, Si, Fe; (2) W, Mo, Fe; (3) other alloying elements and Fe; Input interlude is 25-28 minute, and after throwing in, Argon stirs;
(3) add hot piercing, described blank heating is bored a hole at 1155-1165 ℃, obtain pipe, and control punch excentricity is less than 7%;
(4) thermal treatment.
3. the production method of high temperaturesteel tube material according to claim 2, it is characterized in that: described thermal treatment is: pipe is heated to 760-770 ℃ with 23-25 ℃/s speed, insulation 30-40 minute, then be heated to 1020-1030 ℃ with 25-27 ℃/s speed, insulation 7-9 minute; Cool to 50-90 ℃ with 240-260 ℃/h of speed again; Be heated to 930-940 ℃ with 23-25 ℃/s speed again, insulation 1-1.5 hour, again with 230-240 ℃/s speed spraying cooling to 320-330 ℃, again with 200-210 ℃/s speed spraying cooling to 80-100 ℃, be heated to 580-590 ℃ with 20-22 ℃/s speed again, insulation 2-3 hour, takes out air cooling and get final product.
4. the production method of high temperaturesteel tube material according to claim 2, is characterized in that: described refining agent is made up of the raw material of following weight part: scrap iron powder 20-24, nano titanium oxide 0.5-1, nano mica powder 0.5-1, monazite 3-5, barium oxide 2-4, calcium oxide 6-8, chromium sesquioxide 2-4, expanded graphite 4-6; Preparation method pulverizes monazite, is heated to molten state with scrap iron powder, adds monazite, barium oxide, calcium oxide, chromium sesquioxide, expanded graphite to stir, degassed in a vacuum; Gained powder is pressed into base under 0.7-1Kpa, then, at 1210-1240 ℃, calcines 1-2 hour, cooling after, then be ground into 100-200 order powder, mix with other remaining components, to obtain final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410018615.7A CN103789706A (en) | 2014-01-16 | 2014-01-16 | High temperature resistant steel pipe material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410018615.7A CN103789706A (en) | 2014-01-16 | 2014-01-16 | High temperature resistant steel pipe material and preparation method thereof |
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| Publication Number | Publication Date |
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| CN103789706A true CN103789706A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410018615.7A Pending CN103789706A (en) | 2014-01-16 | 2014-01-16 | High temperature resistant steel pipe material and preparation method thereof |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834945A (en) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | A kind of steel for manufacturing bellows |
| CN106834953A (en) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | A kind of alloy material for manufacturing high-cooling property bellows |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1771345A (en) * | 2003-02-07 | 2006-05-10 | 先进钢铁技术有限责任公司 | Fine-grained martensitic stainless steel and method thereof |
| CN101177721A (en) * | 2006-11-10 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Multifunctional Compound Refining Agent for Steelmaking |
| TW201029776A (en) * | 2008-10-16 | 2010-08-16 | Uddeholm Tooling Ab | Steel material and a method for its manufacture |
| CN102369304A (en) * | 2009-04-01 | 2012-03-07 | 罗瓦玛股份公司 | Hot working tool steel with excellent toughness and thermal conductivity |
| CN102409138A (en) * | 2011-10-31 | 2012-04-11 | 芜湖山桥铁路器材有限公司 | Manufacturing process of alloy steel for rail frog |
-
2014
- 2014-01-16 CN CN201410018615.7A patent/CN103789706A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1771345A (en) * | 2003-02-07 | 2006-05-10 | 先进钢铁技术有限责任公司 | Fine-grained martensitic stainless steel and method thereof |
| CN101177721A (en) * | 2006-11-10 | 2008-05-14 | 攀钢集团攀枝花钢铁研究院 | Multifunctional Compound Refining Agent for Steelmaking |
| TW201029776A (en) * | 2008-10-16 | 2010-08-16 | Uddeholm Tooling Ab | Steel material and a method for its manufacture |
| CN102369304A (en) * | 2009-04-01 | 2012-03-07 | 罗瓦玛股份公司 | Hot working tool steel with excellent toughness and thermal conductivity |
| CN102409138A (en) * | 2011-10-31 | 2012-04-11 | 芜湖山桥铁路器材有限公司 | Manufacturing process of alloy steel for rail frog |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106834945A (en) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | A kind of steel for manufacturing bellows |
| CN106834953A (en) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | A kind of alloy material for manufacturing high-cooling property bellows |
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Application publication date: 20140514 |