CN1421286A - Rolling process of H-shaped niobium-containing steel - Google Patents
Rolling process of H-shaped niobium-containing steel Download PDFInfo
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- CN1421286A CN1421286A CN 02138375 CN02138375A CN1421286A CN 1421286 A CN1421286 A CN 1421286A CN 02138375 CN02138375 CN 02138375 CN 02138375 A CN02138375 A CN 02138375A CN 1421286 A CN1421286 A CN 1421286A
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Abstract
The rolling process of H-shaped niobium-containing steel is performed under altered and optimized technological conditions in available rolling equipment. The rolling process is a two-stage one. In the rolling stage in the re-crystallization area, temperature is controlled and single gate deformation is controlled to be greater than the critical deformation to make austenite ever fine. In the rolling stage in the non-crystallization area, the single gate deformation is controlled to change successively and to obtain one total deformation amount of 45-60 %, so as to obtain fine ferrite crystal grains, homogeneous metallurgical structure, high strength, high toughness, high weldability. The product may be used in petroleum platform.
Description
One, technical field
The present invention relates to a kind of shaped steel hot rolling technology, exactly is a kind of rolling method that contains niobium (Nb) H shaped steel.
Two, background technology
Common H shaped steel is applicable to covil construction and Industrial buildings etc., but its intensity and the toughness transverse impact toughness under the cold condition particularly still can not satisfy the requirement such as rail truck industry, marine petroleum exploitation platform industry etc.The over-all properties of H shaped steel and the Chemical Composition of steel, metallurgical structure are closely related.Improve the method for the over-all properties of steel and carry out vanadium (V), niobium (Nb), the titanium low alloyings such as (Ti), also on technology, carry out the controlled rolling technology, realize the refinement of ferrite crystal grain by refine austenite crystal grain except the Chemical Composition of adjusting steel.Abroad the controlled rolling technology about H shaped steel has two kinds, the one, TM-SC (cooling of control bundle-part) technology, carry out cooling in common controlled rolling process edge abdomen zone of transition when rolling, this need install corresponding cooling equipment and Controlling System thereof on milling train, to the corresponding cooling power of girder steel adjustment of different size.The 2nd, QST (quenching and self-tempering) technology is online thermal treatment, after finish to gauge girder steel is carried out quick water cooling exactly and makes its surface produce martensite, stops cooling before the girder steel center is still uncolled, and martensite is self-tempering under the effect of center heat.This also need install corresponding water cooling equipment and Controlling System on milling train.These two kinds of technologies all are that main rapid variation by temperature comes the refinement metallographic structure, can unite use, can greatly improve comprehensive properties of rolled steel.
Three, summary of the invention
The present invention will utilize existing H shaped steel hot-rolling arrangement exactly, under the condition that does not increase any cooling apparatus, produces the high-quality that meets the specific industry requirement by the controlled rolling technology and contains niobium H shaped steel.
The reinforcement malleableize theory of Metallkunde is told us, and grain refining is to improve the strength of materials and flexible effective means.No matter be basic, normal, high carbon steel or low, microalloyed steel, in the operation of rolling, along with the variation of temperature and deflection, perfect recrystallization all will take place in austenite, three processes of part recrystallize and non-recrystallization.The controlled rolling of recrystallization zone makes the austenite crystal refinement, make the further refinement of ferrite crystal grain, must carry out controlled rolling to the non-recrystallization district on this basis.
Technical scheme of the present invention is exactly to utilize the dependency of metallic substance in recrystallization zone and distortion of non-recrystallization district and austenite crystal refinement, H shaped steel deformation process is divided into the control of two stages, promptly in the recrystallization zone controlled rolling, make a refinement of austenite, in the controlled rolling of non-recrystallization district, make ferrite obtain tiny ferrite crystal grain, thereby evenly, the refinement metallographic structure, obtain the H shaped steel of high strength, high tenacity at the turck's zone forming core.
Recrystallization zone controlled rolling major control texturing temperature and single pass draught, concrete controlled deformation temperature is 1150 ℃～1100 ℃, single pass cumulative deformation 〉=45%, single pass cumulative deformation≤60%.
Controlled rolling preferred single pass heavy deformation 6～12% in recrystallization zone is the best with 8～9%.
Non-recrystallization district controlled rolling major control texturing temperature and cumulative deformation, concrete controlled deformation temperature＜950 ℃, cumulative deformation 〉=45%.
920～850 ℃ of non-recrystallization district controlled rolling advantageous version temperature, single pass heavy deformation minimum 6%, all the other require to adjust until cumulative deformation 〉=45% according to H shaped steel final dimension, preferred 〉=50%.
The present invention utilizes conventional device and technical process, under the condition that does not increase other equipment, according to the physics of metals metallurgy principle, processing condition to routine are adjusted, optimize, by recrystallization zone controlled rolling refine austenite crystal grain, the controlled rolling of non-recrystallization district produces capacity, thereby even turck's zone refinement ferrite crystal grain, make metallographic structure even, refinement, product performance are significantly improved, and organize tiny, evenly, obdurability is good, weldability is good, tensile strength 490～610MPa ,-20 ℃ of transverse impact merit 34～98J satisfy the requirement of API platform design standard II class steel.
Four, embodiment
Existing H shaped steel hot rolled technical process comprises heating roughing cogging, the rolling district of BD, treats warm area, omnipotent roughing district and finish to gauge.
The processing condition of recrystallization zone controlled rolling are 1150～1100 ℃ of temperature, and single pass heavy deformation 6～12% makes steel in roughing cogging moulding process dynamic recrystallization take place under these processing condition, and austenite crystal is fined; Steel are treated the warm non-recrystallization district controlled rolling of carrying out before the omnipotent roughing when recrystallization temperature is below 950 ℃, preferred temperature is 920～850 ℃, single pass heavy deformation minimum 6%, all the other are adjusted according to H shaped steel final dimension, guarantee cumulative deformation 〉=45%, best 〉=50%, make the austenite crystal intragranular of first refinement produce capacity and uniform turck's zone, the carboritride of niobium is separated out in a large number at intracrystalline and crystal boundary simultaneously, become the core of ferrite forming core, guarantee that finished product organizes evenly tinyly fully, its strength and toughness is strengthened simultaneously.
Raising H shaped steel intensity provided by the present invention and flexible method have ubiquity, that is to say other shaped steel such as joist steel, channel-section steel, flat bulb steel, angle steel, and be also suitable substantially when exploitation high strength, high tenacity product.
Claims (5)
1, a kind of rolling method that contains niobium H shaped steel comprises roughing cogging, omnipotent roughing and omnipotent finish to gauge, it is characterized in that:
1150～1100 ℃ of recrystallization zone controlled rolling temperature, single pass heavy deformation be greater than the critical strain amount of (contain and equal) steel, non-recrystallization district controlled rolling temperature＜950 ℃, single pass cumulative deformation 〉=45%, single pass cumulative deformation≤60%.
2, a kind of rolling method that contains niobium H shaped steel according to claim 1, it is characterized in that: controlled rolling single pass heavy deformation in recrystallization zone is 6～12%.
3, a kind of rolling method that contains niobium H shaped steel according to claim 1 and 2, it is characterized in that: controlled rolling single pass heavy deformation in recrystallization zone is 8～9%.
4, a kind of rolling method that contains niobium H shaped steel according to claim 1, it is characterized in that: 920～850 ℃ of non-recrystallization district controlled rolling temperature, single pass heavy deformation increases up to cumulative deformation 〉=45% successively from 6%.
5, according to claim 1 or 4 described a kind of rolling methods that contain niobium H shaped steel, it is characterized in that: non-recrystallization district controlled rolling passage cumulative deformation 〉=50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138375 CN1206048C (en) | 2002-09-30 | 2002-09-30 | Rolling process of H-shaped niobium-containing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138375 CN1206048C (en) | 2002-09-30 | 2002-09-30 | Rolling process of H-shaped niobium-containing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1421286A true CN1421286A (en) | 2003-06-04 |
| CN1206048C CN1206048C (en) | 2005-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02138375 Expired - Fee Related CN1206048C (en) | 2002-09-30 | 2002-09-30 | Rolling process of H-shaped niobium-containing steel |
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| Country | Link |
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| CN (1) | CN1206048C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021474A (en) * | 2010-10-15 | 2011-04-20 | 马鞍山钢铁股份有限公司 | Anti-seismic H-type steel and production method thereof |
| CN102605243A (en) * | 2012-03-15 | 2012-07-25 | 莱芜钢铁集团有限公司 | Wind power H-beams and production method thereof |
| WO2021115263A1 (en) | 2019-12-09 | 2021-06-17 | 山东钢铁股份有限公司 | Hot-rolled h-beam steel based on special-shaped billet rolling and forming, and manufacturing method therefor |
-
2002
- 2002-09-30 CN CN 02138375 patent/CN1206048C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021474A (en) * | 2010-10-15 | 2011-04-20 | 马鞍山钢铁股份有限公司 | Anti-seismic H-type steel and production method thereof |
| CN102605243A (en) * | 2012-03-15 | 2012-07-25 | 莱芜钢铁集团有限公司 | Wind power H-beams and production method thereof |
| WO2021115263A1 (en) | 2019-12-09 | 2021-06-17 | 山东钢铁股份有限公司 | Hot-rolled h-beam steel based on special-shaped billet rolling and forming, and manufacturing method therefor |
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| Publication number | Publication date |
|---|---|
| CN1206048C (en) | 2005-06-15 |
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Granted publication date: 20050615 Termination date: 20190930 |