CN104018073B - A kind of low temperature resistant toughness H profile steel and production technique thereof - Google Patents
A kind of low temperature resistant toughness H profile steel and production technique thereof Download PDFInfo
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- CN104018073B CN104018073B CN201410276246.1A CN201410276246A CN104018073B CN 104018073 B CN104018073 B CN 104018073B CN 201410276246 A CN201410276246 A CN 201410276246A CN 104018073 B CN104018073 B CN 104018073B
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Abstract
The invention discloses a kind of low temperature resistant toughness H profile steel, its chemical composition mass percentage 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%, and surplus is iron and impurity element.Its rolling technological parameter is: Heating temperature 1230 ~ 1250 DEG C, breaking down start rolling temperature 1050 ~ 1150 DEG C, finish rolling start rolling temperature 940 ~ 950 DEG C, finish rolling finishing temperature 780 DEG C ~ 850 DEG C; 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 profile steel naturally cools to room temperature.Enable H profile 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.
Description
Technical field
The present invention relates to H profile steel production technical field, especially relate to a kind of low temperature resistant toughness H profile steel and production technique thereof.
Background technology
At about-10 DEG C, as used H profile steel in extremely frigid zones and low temperature environment, then, when bearing dynamic load or impacting, easily there is brittle failure, cause unnecessary loss in its ductile-brittle transition temperature of current H profile steel.
Particularly in the H profile steel of-40 DEG C and following environment, the toughness of its H profile steel is lower, and low-temperature impact resistance is poor, can not meet service requirements.
If publication number is the Chinese invention patent of CN102618781A, disclose a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, it strengthens the Composition Control to Hot Metal in Beam Blank by smelting technology, but its low-temperature flexibility of-20 DEG C only reaches average 90J.
Summary of the invention
Not enough for prior art, technical problem to be solved by this invention is to provide a kind of low temperature resistant toughness H profile steel and production technique thereof, to have the object of excellent toughness under reaching H profile steel low temperature environment.
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 profile steel, its chemical composition mass percentage 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%, and surplus is iron and impurity element.
Also comprise mass percentage: Als >=0.015%.
A production technique for low temperature resistant toughness H profile steel, its rolling technological parameter is: Heating temperature 1230 ~ 1250 DEG C, breaking down start rolling temperature 1050 ~ 1150 DEG C, finish rolling start rolling temperature 940 ~ 950 DEG C, finish rolling finishing temperature 780 DEG C ~ 850 DEG C;
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 profile steel naturally cools to room temperature.
The present invention compared with prior art, has the following advantages:
Enable H profile steel under-40 DEG C and following temperature extremely frigid zones and low temperature environment, have extremely low ductile-brittle transition temperature, good low-temperature impact resistance, the low-temperature flexibility of-40 DEG C, more than 250J, improves 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 profile steel, its chemical composition mass percentage is: carbon: 0.11%, silicon: 0.22%, manganese: 1.40%, phosphorus: 0.008%, sulphur: 0.002%, niobium: 0.042%, Als:0.028%, and surplus is iron and impurity element.
This steel, through hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H profile steel line rolling, finally carries out rolled piece cooling.Wherein, the rolling of H profile 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: Heating temperature 1246 DEG C, breaking down start rolling temperature 1120 DEG C, finish rolling start rolling temperature 941 DEG C, finish rolling finishing temperature 822 DEG C;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of about 600 DEG C with 75 DEG C/s speed of cooling, then rises again to 728 DEG C, and last H profile steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H profile steel is in table 1.
Embodiment 2, this low temperature resistant toughness H profile steel, its chemical composition mass percentage is: carbon: 0.10%, silicon: 0.26%, manganese: 1.42%, phosphorus: 0.007%, sulphur: 0.003%, niobium: 0.040%, Als:0.019%, and surplus is iron and impurity element.
This steel, through hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H profile steel line rolling, finally carries out rolled piece cooling.Wherein, the rolling of H profile 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: Heating temperature 1235 DEG C, breaking down start rolling temperature 1110 DEG C, finish rolling start rolling temperature 945 DEG C, finish rolling finishing temperature 833 DEG C;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of about 598 DEG C with 78 DEG C/s speed of cooling, then rises again to 733 DEG C, and last H profile steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H profile steel is in table 1.
Embodiment 3, this low temperature resistant toughness H profile steel, its chemical composition mass percentage is: carbon: 0.09%, silicon: 0.25%, manganese: 1.39%, phosphorus: 0.005%, sulphur: 0.006%, niobium: 0.038%, Als:0.022%, and surplus is iron and impurity element.
This steel, through hot metal pretreatment → converter smelting → ladle argon-blown → LF refining → Hot Metal in Beam Blank full guard casting → H profile steel line rolling, finally carries out rolled piece cooling.Wherein, the rolling of H profile 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: Heating temperature 1241 DEG C, breaking down start rolling temperature 1130 DEG C, finish rolling start rolling temperature 946 DEG C, finish rolling finishing temperature 818 DEG C;
Process for cooling parameter is: rolled piece is cooled to the interval phase transformation of about 604 DEG C with 72 DEG C/s speed of cooling, then rises again to 736 DEG C, and last H profile steel naturally cools to room temperature.
The mechanical property of low temperature resistant toughness H profile steel is in table 1.
Table 1 is the mechanical properties test result of low temperature resistant toughness H profile steel
Obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (2)
1. a production technique for low temperature resistant toughness H profile steel, is characterized in that:
Described low temperature resistant toughness H profile steel, its chemical composition mass percentage 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%, and surplus is iron and impurity element;
The rolling technological parameter of described production technique is: Heating temperature 1230 ~ 1250 DEG C, breaking down start rolling temperature 1050 ~ 1150 DEG C, finish rolling start rolling temperature 940 ~ 950 DEG C, finish rolling finishing temperature 780 DEG C ~ 850 DEG C;
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 profile steel naturally cools to room temperature.
2. production technique as claimed in claim 1, is characterized in that: described low temperature resistant toughness H profile steel also comprises mass percentage: Als >=0.015%.
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| CN104018073B true CN104018073B (en) | 2015-11-18 |
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Families Citing this family (8)
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| 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 |
| JP6665525B2 (en) * | 2015-12-24 | 2020-03-13 | 日本製鉄株式会社 | H-shaped steel for low temperature and method for producing the same |
| 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 |
| EP3597783B1 (en) * | 2017-03-15 | 2022-06-08 | Nippon Steel Corporation | H-section steel and method of producing the same |
| 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 |
| CN112410667B (en) * | 2020-11-10 | 2022-08-05 | 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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| JPS5322853A (en) * | 1976-08-16 | 1978-03-02 | Sumitomo Metal Ind | Non treatment h shade steel sections manufacturing for low temperature |
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