CN104018073A - Low-temperature toughness resistant H-shaped steel and production process thereof - Google Patents
Low-temperature toughness resistant H-shaped steel and production process thereof Download PDFInfo
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- CN104018073A CN104018073A CN201410276246.1A CN201410276246A CN104018073A CN 104018073 A CN104018073 A CN 104018073A CN 201410276246 A CN201410276246 A CN 201410276246A CN 104018073 A CN104018073 A CN 104018073A
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Abstract
The invention discloses low-temperature toughness resistant H-shaped steel comprising the following chemical components in percentage by mass: 0.08-0.13% of C, 0.15-0.35% of Si, 1.25-1.45% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.03-0.05% of Nb and the balance of Fe and impurity elements. The rolling technological parameters are as follows: the heating temperature ranges from 1230 DEG C to 1250 DEG C, the initial blooming temperature ranges from 1050 DEG C to 1150 DEG C, the initial finish rolling temperature ranges from 940 DEG C to 950 DEG C, and the final finish rolling temperature ranges from 780 DEG C to 850 DEG C; the cooling technological parameters are as follows: a rolled piece is cooled to the interval of 580-680 DEG C at the speed of 50-100 DEG C/s to generate phase change, then, the rolled piece is heated to 700-750 DEG C, and finally, the H-shaped steel is naturally cooled to room temperature. The H-shaped steel can have extremely low ductile-brittle transition temperature and favorable low temperature impact resistance in high and cold areas and low-temperature environments with the temperature of 40 DEG C below zero and even lower.
Description
Technical field
The present invention relates to H shaped steel production technical field, especially relate to a kind of low temperature resistant toughness H shaped steel and production technique thereof.
Background technology
-10 DEG C of left and right, as used H shaped steel in extremely frigid zones and low temperature environment,, in the time bearing dynamic load or impact, easily there is brittle failure in current its ductile-brittle transition temperature of H shaped steel, causes unnecessary loss.
Particularly, at the H shaped steel of-40 DEG C and following environment, the toughness of its H shaped steel is lower, and low-temperature impact resistance is poor, can not meet service requirements.
As the Chinese invention patent that publication number is CN102618781A, a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof is disclosed, it strengthens the Composition Control to Hot Metal in Beam Blank by smelting technology, but its low-temperature flexibility of-20 DEG C has only reached average 90J.
Summary of the invention
For prior art deficiency, technical problem to be solved by this invention is to provide a kind of low temperature resistant toughness H shaped steel and production technique thereof, to reach the object under H shaped steel low temperature environment with excellent toughness.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of low temperature resistant toughness H shaped steel, its chemical composition quality percentage composition is: carbon 0.08～0.13%, silicon 0.15～0.35%, manganese 1.25～1.45%, phosphorus≤0.01%, sulphur≤0.01%, niobium 0.03～0.05%, surplus is iron and impurity element.
Also comprise quality percentage composition: Als >=0.015%.
A production technique for low temperature resistant toughness H shaped steel, its rolling technological parameter is: 1230～1250 DEG C of Heating temperatures, 1050～1150 DEG C of breaking down start rolling temperatures, 940～950 DEG C of finish rolling start rolling temperatures, 780 DEG C～850 DEG C of finish rolling finishing temperatures;
Process for cooling parameter is: rolled piece is cooled to 580～680 DEG C of interval phase transformations with 50～100 DEG C/s speed of cooling, then rises again to 700～750 DEG C, and last H shaped steel naturally cools to room temperature.
The present invention compared with prior art, has the following advantages:
Make H shaped steel under-40 DEG C and following temperature extremely frigid zones and low temperature environment, there is extremely low ductile-brittle transition temperature, good low-temperature impact resistance, the low-temperature flexibility of-40 DEG C exceedes 250J, has improved the quality of product.
Embodiment
By the description to embodiment, the specific embodiment of the present invention is described in further detail.
Embodiment 1, this low temperature resistant toughness H shaped steel, its chemical composition quality percentage composition is: carbon: 0.11%, silicon: 0.22%, manganese: 1.40%, phosphorus: 0.008%, sulphur: 0.002%, niobium: 0.042%, Als:0.028%, surplus is iron and impurity element.
This steel is through the rolling of hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H section steel line, finally carries out rolled piece cooling.Wherein, the rolling of H section steel line comprises roughing and the rolling of finish rolling twice.The NM operation of the present invention, all can adopt prior art.
Wherein, rolling technological parameter is: 1246 DEG C of Heating temperatures, 1120 DEG C of breaking down start rolling temperatures, 941 DEG C of finish rolling start rolling temperatures, 822 DEG C of finish rolling finishing temperatures;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of 600 DEG C of left and right with 75 DEG C/s speed of cooling, then rises again to 728 DEG C, and last H shaped steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H shaped steel is in table 1.
Embodiment 2, this low temperature resistant toughness H shaped steel, its chemical composition quality percentage composition is: carbon: 0.10%, silicon: 0.26%, manganese: 1.42%, phosphorus: 0.007%, sulphur: 0.003%, niobium: 0.040%, Als:0.019%, surplus is iron and impurity element.
This steel is through the rolling of hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H section steel line, finally carries out rolled piece cooling.Wherein, the rolling of H section steel line comprises roughing and the rolling of finish rolling twice.The NM operation of the present invention, all can adopt prior art.
Wherein, rolling technological parameter is: 1235 DEG C of Heating temperatures, 1110 DEG C of breaking down start rolling temperatures, 945 DEG C of finish rolling start rolling temperatures, 833 DEG C of finish rolling finishing temperatures;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of 598 DEG C of left and right with 78 DEG C/s speed of cooling, then rises again to 733 DEG C, and last H shaped steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H shaped steel is in table 1.
Embodiment 3, this low temperature resistant toughness H shaped steel, its chemical composition quality percentage composition is: carbon: 0.09%, silicon: 0.25%, manganese: 1.39%, phosphorus: 0.005%, sulphur: 0.006%, niobium: 0.038%, Als:0.022%, surplus is iron and impurity element.
This steel is through the rolling of hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H section steel line, finally carries out rolled piece cooling.Wherein, the rolling of H section steel line comprises roughing and the rolling of finish rolling twice.The NM operation of the present invention, all can adopt prior art.
Wherein, rolling technological parameter is: 1241 DEG C of Heating temperatures, 1130 DEG C of breaking down start rolling temperatures, 946 DEG C of finish rolling start rolling temperatures, 818 DEG C of finish rolling finishing temperatures;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of 604 DEG C of left and right with 72 DEG C/s speed of cooling, then rises again to 736 DEG C, and last H shaped steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H shaped steel is in table 1.
Table 1 is the mechanical properties test result of low temperature resistant toughness H shaped steel
Obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (3)
1. a low temperature resistant toughness H shaped steel, it is characterized in that: its chemical composition quality percentage composition is: carbon 0.08～0.13%, silicon 0.15～0.35%, manganese 1.25～1.45%, phosphorus≤0.01%, sulphur≤0.01%, niobium 0.03～0.05%, surplus is iron and impurity element.
2. low temperature resistant toughness H shaped steel as claimed in claim 1, is characterized in that: also comprise quality percentage composition: Als >=0.015%.
3. a production technique for low temperature resistant toughness H shaped steel as claimed in claim 1 or 2, is characterized in that:
Rolling technological parameter is: 1230～1250 DEG C of Heating temperatures, 1050～1150 DEG C of breaking down start rolling temperatures, 940～950 DEG C of finish rolling start rolling temperatures, 780 DEG C～850 DEG C of finish rolling finishing temperatures;
Process for cooling parameter is: rolled piece is cooled to 580～680 DEG C of interval phase transformations with 50～100 DEG C/s speed of cooling, then rises again to 700～750 DEG C, and last H shaped steel naturally cools to room temperature.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831164A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-shaped steel and production method thereof |
| CN106756527A (en) * | 2016-11-15 | 2017-05-31 | 南京钢铁股份有限公司 | A kind of liquid gas carbon manganese low-temperature steel peculiar to vessel and manufacture method |
| JP2017115200A (en) * | 2015-12-24 | 2017-06-29 | 新日鐵住金株式会社 | H-shaped steel for low temperature and production method therefor |
| CN107829031A (en) * | 2017-11-21 | 2018-03-23 | 安徽金阳金属结构工程有限公司 | A kind of big cross section H profile steel and its production technology |
| CN107868910A (en) * | 2017-11-21 | 2018-04-03 | 安徽金阳金属结构工程有限公司 | A kind of low temperature resistant toughness H profile steel and its production technology |
| CN107937808A (en) * | 2017-11-21 | 2018-04-20 | 安徽金阳金属结构工程有限公司 | A kind of hot rolled H-shaped and its production technology |
| CN110291218A (en) * | 2017-03-15 | 2019-09-27 | 日本制铁株式会社 | H profile steel and its manufacturing method |
| CN112410667A (en) * | 2020-11-10 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Low-cost thick Q355E hot-rolled H-shaped steel and manufacturing method thereof |
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| CN103667910A (en) * | 2013-12-13 | 2014-03-26 | 莱芜钢铁集团有限公司 | Hot-rolled H-shaped steel with excellent low-temperature impact toughness and manufacturing method thereof |
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| JPS6043412B2 (en) * | 1977-09-26 | 1985-09-27 | 新日本製鐵株式会社 | Method for manufacturing H-beam steel with excellent low-temperature toughness at the base of the web |
| CN102021475A (en) * | 2010-10-25 | 2011-04-20 | 莱芜钢铁股份有限公司 | Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831164A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-shaped steel and production method thereof |
| JP2017115200A (en) * | 2015-12-24 | 2017-06-29 | 新日鐵住金株式会社 | H-shaped steel for low temperature and production method therefor |
| CN106756527A (en) * | 2016-11-15 | 2017-05-31 | 南京钢铁股份有限公司 | A kind of liquid gas carbon manganese low-temperature steel peculiar to vessel and manufacture method |
| CN106756527B (en) * | 2016-11-15 | 2018-06-19 | 南京钢铁股份有限公司 | A kind of liquid gas carbon manganese low-temperature steel peculiar to vessel and manufacturing method |
| CN110291218A (en) * | 2017-03-15 | 2019-09-27 | 日本制铁株式会社 | H profile steel and its manufacturing method |
| CN110291218B (en) * | 2017-03-15 | 2021-06-22 | 日本制铁株式会社 | H-shaped steel and manufacturing method thereof |
| CN107829031A (en) * | 2017-11-21 | 2018-03-23 | 安徽金阳金属结构工程有限公司 | A kind of big cross section H profile steel and its production technology |
| CN107868910A (en) * | 2017-11-21 | 2018-04-03 | 安徽金阳金属结构工程有限公司 | A kind of low temperature resistant toughness H profile steel and its production technology |
| CN107937808A (en) * | 2017-11-21 | 2018-04-20 | 安徽金阳金属结构工程有限公司 | A kind of hot rolled H-shaped and its production technology |
| CN112410667A (en) * | 2020-11-10 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Low-cost thick Q355E hot-rolled H-shaped steel and manufacturing method thereof |
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