CN102181800A - Fire-resistant seamless steel pipe for building and machining method thereof - Google Patents
Fire-resistant seamless steel pipe for building and machining method thereof Download PDFInfo
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- CN102181800A CN102181800A CN 201110091555 CN201110091555A CN102181800A CN 102181800 A CN102181800 A CN 102181800A CN 201110091555 CN201110091555 CN 201110091555 CN 201110091555 A CN201110091555 A CN 201110091555A CN 102181800 A CN102181800 A CN 102181800A
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Abstract
The invention relates to a fire-resistant seamless steel pipe for building, the alloy component of which contains the chemical components in percentage by mass: 0.12 to 0.16% of C, 0.17 to 0.30% of Si, 1.30 to 1.60% of Mn, not more than 0.020% of P, not more than 0.15% of S, not more than 0.20% of Cu, not more than 0.20% of Ni, not more than 0.20% of Cr, not more than 0.15% of Mo, 0.03 to 0.08% of V, 0.015 to 0.030% of Ti, 0.01 to 0.03% of Nb, not more than 0.41% of CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15, and the balance of Fe. During machining, the following procedures, such as hot metal desulphurization, converter smelting, LF (Ladle Furnace) refining, VD (Vacuum Degassing) vacuum treatment, continuous casting, (acid polishing) checking, round pipe blank machining, round pipe blank heating, perforation, PQF (Premium Quality Finishing) hot continuous rolling, flame-isolating thermal treatment, sizing, cooling, straightening, cutting, checking, stenciling and packaging and warehousing, are performed. The fire-resistant seamless steel pipe of the invention has the advantages of low machining cost, excellent welding performance and strong fire accident preventing capability.
Description
Technical field
The present invention relates to the iron and steel manufacture field, be specifically related to a kind of fire-resistant weldless steel tube for building and working method thereof.
Background technology
Development along with construction business, heavy construction, Highrise buildings continue to bring out, the fire savety of steel construction obtains people's attention, particularly after U.S.'s September 11 attacks, the fire prevention technological design of buildings has been become one of requisite measure that guarantees building safety.At present, the research and development of fire-resistant steel mainly concentrate on steel plate and the shaped steel, and the research and development of fire-resistant weldless steel tube are in space state.Fire-resistant weldless steel tube is had many uses, and can be used for the aspects such as crossbeam, pile of office building, market, hotel, factory building, gymnasium, station contour level building.
Summary of the invention
" the fire-resistant weldless steel tube for building " of our company research and development, successful solution under 600 ℃ of high temperature, the strength level that the steel pipe maintenance is very high.Its yield strength has reached more than 60% of room temperature numerical value, has guaranteed the ability of buildings load-bearing main body opposing fire, the security that has improved buildings.
Fire-resistant steel is different from common high temperature steel, and the high-temperature behavior of heat-resisting steel to steel has strict demand as creep rupture strength, creep strength, fatigue property etc.And fire-resistant steel does not need long hot strength on performance, as long as its yield strength is not less than the safety that 60% under the room temperature can guarantee structure more than 3 hours keeping under the high temperature about 600 ℃.Therefore, the alloying element content of fire-resistant steel is than low many of the alloying element content of high temperature steel under the same intensity rank.Adopt Nb-V-Ti microalloying principle, reduce carbon content to guarantee the welding property of structure.
The technical solution used in the present invention is as follows for achieving the above object:
A kind of fire-resistant weldless steel tube for building is characterized in that the alloying constituent of steel pipe and percentage composition are: C0.12-0.16%, Si0.17-0.30%, Mn1.30-1.60%, P≤0.020%, S≤0.015%, Cu≤0.20%, Ni≤0.20%, Cr≤0.20%, Mo≤0.15%, V0.03-0.08%, Ti0.015-0.030%, Nb 0.01-0.03%, surplus is Fe.
The working method of described fire-resistant weldless steel tube for building is characterized in that: the carbon equivalent ce=C+Mn/6+ of described steel pipe (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.41%.
The working method of described fire-resistant weldless steel tube for building is characterized in that: may further comprise the steps:
(1) adopt interpolation Nb-V-Ti microalloying, by LF refining, VD vacuum-treat, continuous casting becomes circular pipe blank;
(2) circular pipe blank heating
Circular pipe blank heats in the heat accumulating type rotary heating furnace, and the heat-processed pipe rotates with furnace bottom, 1210 ± 10 ℃ of Heating temperatures, and 50-60 minute heat-up time, the heating of pipe blank end temperature difference is not more than ± and 10 ℃;
(3) perforation
The circular pipe blank that heated is bored a hole with three roll piercer, and the roll off angle is 15 ° ± 2 °, and maximum coefficient of extension is 4, perforation capillary outer diameter permissible variation ± 3%D, wall thickness permissible variation ± 15%t (D, t are respectively capillary outer diameter and wall thickness);
(4) PQF tandem rolling
Hollow billet after the perforation directly advances SMS-MEER PQF tube rolling mill tandem rolling, tube rolling temperature 〉=960 ℃, and maximum coefficient of extension 3.9 is adjusted to the rolling hollow forging of wall thickness of regulation, waste external diameter of pipe permissible variation ± 5mm, wall thickness permissible variation ± 10%t with milling train;
(5) isolated flame thermal treatment
Hollow forging after rolling drives in the bigger cast tube of bore, closed at both ends, enter the walking-beam furnace reheat, 1350 ± 10 ℃ of Heating temperatures, 58-62 minute heat-up time, make the thermal treatment flame can not directly calcination on steel tube surface, reduce oxidation, guarantee heat treated homogeneity, improved the high-temperature behavior of steel pipe, guaranteed that the steel pipe yield strength is greater than more than 60% of room temperature lower yield strength under 600 ℃ of hot conditionss;
(6) sizing
Hollow forging after allowing step (5) heat enters 14 frame slight stretch sizing mills, produces the steel pipe sizes of regulation, will guarantee 900 ± 10 ℃ of tapping temperatures behind the sizing;
(7) cold bed cooling
Steel pipe after the sizing processing enters sprocket-type cold bed air cooling, and steel pipe has guaranteed the straight degree of steel pipe in process of cooling with the gear fine rotation;
(8) aligning, cutting
Adopt seven rollers, five column straighteners aligning, recessed, defectives such as aligning is oval, aligning decorative pattern that rectifying must not appear in the aligning process in steel pipe, steel pipe is directly spent requirement: action＜0.2%L (L steel pipe length), apart from the maximum deviation 3mm of pipe end 1M place, aligning back steel pipe cuts tube head pipe tail according to length requirement, otch must be vertical, and fin cutting, gets production tube.
Beneficial effect of the present invention:
1, fire-resistant steel does not have a mind to add noble elements such as Cr, Mo, adopts Nb-V-Ti microalloying design concept, greatly reduces production cost., by reducing carbon content, means such as reduction carbon equivalent obtain good welding property.
2, adopt sleeve pipe thermal treatment, flame can not directly be contacted with steel pipe, make thermal treatment more even, steel tube surface quality is better, reaches under 600 ℃ of hot conditionss, and the steel pipe yield strength (is R greater than the room temperature lower yield strength more than 60%
EL600 ℃〉=0.6R
EL20 ℃), guaranteed the anti-fire ability of building bearing main body.The advantage that the present invention's fire-resistant weldless steel tube for building and common building compare with pipe:
1, fire-resistant weldless steel tube for building of the present invention adopts Nb-V-Ti microalloying design concept, does not have a mind to use noble elements such as Cr, Mo, greatly reduces cost.
2, fire-resistant weldless steel tube for building of the present invention further reduces carbon equivalent by reducing carbon content, makes the steel pipe welding property good.
3, the present invention's fire-resistant weldless steel tube for building has improved steel tube surface quality by isolated flame heat treating method.Guaranteed that under 600 ℃ of hot conditionss the steel pipe yield strength (is R greater than the room temperature lower yield strength more than 60%
EL600 ℃〉=0.6R
EL20 ℃), promptly guaranteed the anti-fire ability of building bearing main body.
Embodiment
A kind of fire-resistant weldless steel tube for building, the alloying constituent of steel pipe and percentage composition are:
C0.12-0.16%, Si0.17-0.30%, Mn1.30-1.60%, P≤0.020%, S≤0.015%, Cu≤0.20%, Ni≤0.20%, Cr≤0.20%, Mo≤0.15%, V0.03-0.08%, Ti0.015-0.030%, Nb 0.01-0.03%, surplus is Fe.
Carbon equivalent ce=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.41%.
The working method of fire-resistant weldless steel tube for building may further comprise the steps:
(1) adopt interpolation Nb-V-Ti microalloying, by LF refining, VD vacuum-treat, continuous casting becomes circular pipe blank;
(2) circular pipe blank heating
Circular pipe blank heats in the heat accumulating type rotary heating furnace, and the heat-processed pipe rotates with furnace bottom, 1210 ± 10 ℃ of Heating temperatures, and 50-60 minute heat-up time, the heating of pipe blank end temperature difference is not more than ± and 10 ℃;
(3) perforation
The circular pipe blank that heated is bored a hole with three roll piercer, and the roll off angle is 15 ° ± 2 °, and maximum coefficient of extension is 4, perforation capillary outer diameter permissible variation ± 3%D, wall thickness permissible variation ± 15%t (D, t are respectively capillary outer diameter and wall thickness);
(4) PQF tandem rolling
Hollow billet after the perforation directly advances SMS-MEER PQF tube rolling mill tandem rolling, tube rolling temperature 〉=960 ℃, and maximum coefficient of extension 3.9 is adjusted to the rolling hollow forging of wall thickness of regulation, waste external diameter of pipe permissible variation ± 5mm, wall thickness permissible variation ± 10%t with milling train;
(5) isolated flame thermal treatment
Hollow forging after rolling drives in the bigger cast tube of bore, closed at both ends, enter the walking-beam furnace reheat, 1350 ± 10 ℃ of Heating temperatures, 58-62 minute heat-up time, make the thermal treatment flame can not directly calcination on steel tube surface, reduce oxidation, guarantee heat treated homogeneity, improved the high-temperature behavior of steel pipe, guaranteed that the steel pipe yield strength is greater than more than 60% of room temperature lower yield strength under 600 ℃ of hot conditionss;
(6) sizing
Hollow forging after allowing step (5) heat enters 14 frame slight stretch sizing mills, produces the steel pipe sizes of regulation, will guarantee 900 ± 10 ℃ of tapping temperatures behind the sizing;
(7) cold bed cooling
Steel pipe after the sizing processing enters sprocket-type cold bed air cooling, and steel pipe has guaranteed the straight degree of steel pipe in process of cooling with the gear fine rotation;
(8) aligning, cutting
Adopt seven rollers, five column straighteners aligning, recessed, defectives such as aligning is oval, aligning decorative pattern that rectifying must not appear in the aligning process in steel pipe, steel pipe is directly spent requirement: action＜0.2%L (L steel pipe length), apart from the maximum deviation 3mm of pipe end 1M place, aligning back steel pipe cuts tube head pipe tail according to length requirement, otch must be vertical, and fin cutting, gets production tube.
Claims (3)
1. a fire-resistant weldless steel tube for building is characterized in that the alloying constituent of steel pipe and percentage composition are: C0.12-0.16%, Si0.17-0.30%, Mn1.30-1.60%, P≤0.020%, S≤0.015%, Cu≤0.20%, Ni≤0.20%, Cr≤0.20%, Mo≤0.15%, V0.03-0.08%, Ti0.015-0.030%, Nb 0.01-0.03%, surplus is Fe.
2. the working method of fire-resistant weldless steel tube for building according to claim 1 is characterized in that: the carbon equivalent ce=C+Mn/6+ of described steel pipe (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.41%.
3. the working method of fire-resistant weldless steel tube for building as claimed in claim 1 is characterized in that: may further comprise the steps:
(1) adopt interpolation Nb-V-Ti microalloying, by LF refining, VD vacuum-treat, continuous casting becomes circular pipe blank;
(2) circular pipe blank heating
Circular pipe blank heats in the heat accumulating type rotary heating furnace, and the heat-processed pipe rotates with furnace bottom, 1210 ± 10 ℃ of Heating temperatures, and 50-60 minute heat-up time, the heating of pipe blank end temperature difference is not more than ± and 10 ℃;
(3) perforation
The circular pipe blank that heated is bored a hole with three roll piercer, and the roll off angle is 15 ° ± 2 °, and maximum coefficient of extension is 4, perforation capillary outer diameter permissible variation ± 3%D, wall thickness permissible variation ± 15%t (D, t are respectively capillary outer diameter and wall thickness);
(4) PQF tandem rolling
Hollow billet after the perforation directly advances SMS-MEER PQF tube rolling mill tandem rolling, tube rolling temperature 〉=960 ℃, and maximum coefficient of extension 3.9 is adjusted to the rolling hollow forging of wall thickness of regulation, waste external diameter of pipe permissible variation ± 5mm, wall thickness permissible variation ± 10%t with milling train;
(5) isolated flame thermal treatment
Hollow forging after rolling drives in the bigger cast tube of bore, closed at both ends, enter the walking-beam furnace reheat, 1350 ± 10 ℃ of Heating temperatures, 58-62 minute heat-up time, make the thermal treatment flame can not directly calcination on steel tube surface, reduce oxidation, guarantee heat treated homogeneity, improved the high-temperature behavior of steel pipe, guaranteed that the steel pipe yield strength is greater than more than 60% of room temperature lower yield strength under 600 ℃ of hot conditionss;
(6) sizing
Hollow forging after allowing step (5) heat enters 14 frame slight stretch sizing mills, produces the steel pipe sizes of regulation, will guarantee 900 ± 10 ℃ of tapping temperatures behind the sizing;
(7) cold bed cooling
Steel pipe after the sizing processing enters sprocket-type cold bed air cooling, and steel pipe has guaranteed the straight degree of steel pipe in process of cooling with the gear fine rotation;
(8) aligning, cutting
Adopt seven rollers, five column straighteners aligning, recessed, defectives such as aligning is oval, aligning decorative pattern that rectifying must not appear in the aligning process in steel pipe, steel pipe is directly spent requirement: action＜0.2%L (L steel pipe length), apart from the maximum deviation 3mm of pipe end 1M place, aligning back steel pipe cuts tube head pipe tail according to length requirement, otch must be vertical, and fin cutting, gets production tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100915558A CN102181800B (en) | 2011-04-13 | 2011-04-13 | Fire-resistant seamless steel pipe for building and machining method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100915558A CN102181800B (en) | 2011-04-13 | 2011-04-13 | Fire-resistant seamless steel pipe for building and machining method thereof |
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| CN102181800A true CN102181800A (en) | 2011-09-14 |
| CN102181800B CN102181800B (en) | 2012-07-04 |
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| CN2011100915558A Expired - Fee Related CN102181800B (en) | 2011-04-13 | 2011-04-13 | Fire-resistant seamless steel pipe for building and machining method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114249A (en) * | 2013-02-25 | 2013-05-22 | 天津钢管集团股份有限公司 | Method for producing medium-wall 20G seamless steel pipe by using controlled rolling instead of normalizing |
| CN104190740A (en) * | 2014-07-15 | 2014-12-10 | 攀钢集团成都钢钒有限公司 | Production method of hot-rolling seamless steel pipe billet |
| CN104878291A (en) * | 2015-06-11 | 2015-09-02 | 达力普石油专用管有限公司 | Seamless line pipe with yield strength being 350MPa and preparation method thereof |
| CN104988428A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Small-caliber high-pressure oil pipe machining process |
| CN108467990A (en) * | 2018-02-27 | 2018-08-31 | 山东钢铁股份有限公司 | Adapt to the wear-resisting high performance alloys structural steel of middle carbon and low-alloy and its manufacture, heat treatment method of hard environment |
| CN109778064A (en) * | 2019-01-11 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of economical 555MPa grades of seamless steel pipes and preparation method thereof |
| CN110404972A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of production method for the seamless steel pipe that diameter is 1422mm |
| CN111465711A (en) * | 2017-12-15 | 2020-07-28 | 株式会社Posco | Steel sheet for pressure vessel excellent in tensile strength and low-temperature impact toughness, and method for producing same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1788103A (en) * | 2003-04-25 | 2006-06-14 | 墨西哥钢管股份有限公司 | Seamless steel tube which is intended to be used as a guide pipe and production method thereof |
-
2011
- 2011-04-13 CN CN2011100915558A patent/CN102181800B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1788103A (en) * | 2003-04-25 | 2006-06-14 | 墨西哥钢管股份有限公司 | Seamless steel tube which is intended to be used as a guide pipe and production method thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114249A (en) * | 2013-02-25 | 2013-05-22 | 天津钢管集团股份有限公司 | Method for producing medium-wall 20G seamless steel pipe by using controlled rolling instead of normalizing |
| CN103114249B (en) * | 2013-02-25 | 2014-08-27 | 天津钢管集团股份有限公司 | Method for producing medium-wall 20G seamless steel pipe by using controlled rolling instead of normalizing |
| CN104190740A (en) * | 2014-07-15 | 2014-12-10 | 攀钢集团成都钢钒有限公司 | Production method of hot-rolling seamless steel pipe billet |
| CN104190740B (en) * | 2014-07-15 | 2016-04-13 | 攀钢集团成都钢钒有限公司 | The production method of hot rolled seamless steel tube pipe |
| CN104878291A (en) * | 2015-06-11 | 2015-09-02 | 达力普石油专用管有限公司 | Seamless line pipe with yield strength being 350MPa and preparation method thereof |
| CN104988428A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Small-caliber high-pressure oil pipe machining process |
| CN111465711A (en) * | 2017-12-15 | 2020-07-28 | 株式会社Posco | Steel sheet for pressure vessel excellent in tensile strength and low-temperature impact toughness, and method for producing same |
| CN111465711B (en) * | 2017-12-15 | 2021-12-24 | 株式会社Posco | Steel sheet for pressure vessel excellent in tensile strength and low-temperature impact toughness, and method for producing same |
| CN108467990A (en) * | 2018-02-27 | 2018-08-31 | 山东钢铁股份有限公司 | Adapt to the wear-resisting high performance alloys structural steel of middle carbon and low-alloy and its manufacture, heat treatment method of hard environment |
| CN109778064A (en) * | 2019-01-11 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of economical 555MPa grades of seamless steel pipes and preparation method thereof |
| CN110404972A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of production method for the seamless steel pipe that diameter is 1422mm |
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| Publication number | Publication date |
|---|---|
| CN102181800B (en) | 2012-07-04 |
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