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Low-cost SM490C hot-rolling H section steel and preparation method thereof
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An H-beam, low-cost technology, applied in the field of metallurgy, to achieve the effect of simple production process, good welding performance, and good matching
Inactive Publication Date: 2015-07-22
INNER MONGOLIA BAOTOU STEEL UNION
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The properties of SM490C and Q345C in the national standard GB1591-2008 low-alloy high-strength structural steel are close but there are still differences. The yield strength of SM490C is 20MPa lower than that of Q345C, and the tensile strength of Q345C ranges from 470MPa to 630MPa.
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Embodiment 1
[0018] The chemical composition weight percentage of steel is: C 0.17%, Si 0.38%, Mn 1.48%, P0.020%, S0.015%, B0.0012% and the rest is Fe; the production method includes 150t converter, out-of-furnace refining, continuous Casting, heating, BD blanking, universal rolling. The parameters of each step are as follows: 150t converter is used for smelting, the end point of the converter is C 0.17%, P 0.028%, S 0.025%, and the tapping temperature at the end point of the converter is controlled at 1650°C; 150 kg of silico-manganese, 11 kg of ferro-vanadium and nitrogen, and 49 kg of ferro-aluminum manganese. The temperature of LF in place is 1522°C, the temperature of LF out of place is 1586°C, the heating time is 25min, and the refining time of LF is 40 minutes; the composition weight percentage of LF in place molten steel is C0.15%, Si0.03%, Mn1.30%, P0. 021%, S0.017%, B0.011%; LF off-site molten steel composition weight percentage is C 0.16%, Si 0.35%, Mn 1.45%, P0.020%, S0.015%, ...
Embodiment 2
[0025] The chemical composition weight percentage of steel is: C 0.14%, Si 0.25%, Mn 1.35%, P0.020%, S0.015%, B0.0012% and the rest is Fe; the production method includes 150t converter, out-of-furnace refining, continuous Casting, heating, BD blanking, universal rolling. The parameters of each step are as follows: 150t converter is used for smelting, the end point of converter is C 0.11%, P 0.025%, S 0.024%, and the tapping temperature at the end point of converter is controlled at 1650°C; the amount of slag and alloy added during refining outside the furnace includes: lime 325 kg, 150 kg of silico-manganese, 10 kg of ferro-vanadiumnitrogen, 51 kg of ferro-aluminum manganese; LF in-position temperature 1518°C, LF off-position temperature 1588°C, heating time 22 minutes, LF refining time 43 minutes; the composition weight percentage of LF in-place molten steel is C0.16%, Si0.0.20%, Mn1.2%, P0.020%, S0.014%, B0.011%; LF off-site molten steel composition weight percentage is C 0...
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Abstract
The invention discloses SM490C hot-rolling H section steel and a preparation method thereof. The preparation method comprises a smelting technology and a rolling technology; the H section steel comprises the following chemical components in percentage by weight: 0.14-0.18% of C, 0.25-0.40% of Si, 1.35-1.50% of Mn, no more than 0.03% of P, no more than 0.020% of S, 0.001-0.002% of B, and the balance of Fe; the tensile strength of the H section steel is 490-610 MPa; the yield strength of the H section steel is higher than or equal to 325 MPa; the elongation percentage of the H section steel is higher than or equal to 30%;the impact at 20 DEG C of a hot-rolling H section steel finished wing plate is higher than or equal to 100 J; the low-temperature impact at 0 DEG C of the wing plate is higher than or equal to 80 J.
Description
technical field [0001] The invention relates to metallurgical technology, in particular to a low-cost SM490C hot-rolled H-shaped steel produced by adopting a special-shaped billet and a preparation method thereof. Background technique [0002] The yield strength of grade SM490C in Japanese Industrial Standard JIS G 3106 is greater than 325Mpa, the tensile strength ranges from 490 to 610MPa, and the low temperature impact at 0°C is ≥47J. In order to realize the production of this steel type in China, microalloying (Nb, V, Ti) is mostly used to obtain low temperature impact properties. The performance of SM490C and Q345C in the national standard GB1591-2008 low-alloy high-strength structural steel is close but there are still differences. The yield strength of SM490C is 20MPa lower than that of Q345C. J From the difference in performance, it can be seen that the tensile strength range of the Japanese standard SM490C is 40MPa narrower than that of the national standard Q345C, ...
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