Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof
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A technology for structural H-shaped steel, applied in the field of metallurgy, can solve the problems of increased cost and infeasibility, and achieve the effect of good low temperature resistance
Active Publication Date: 2011-04-20
SHANDONG IRON & STEEL CO LTD
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However, due to the addition of B, the cost of the product has been increased. At the same time, it is necessary to maintain a lo...
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Embodiment 1
[0035] Example 1: Q345E
[0036] The process route is:
[0037] Hot metal pre-desulfurization→converter smelting→LF refining→shaped billet continuous casting→large H-beam rolling→inspection and storage.
[0038] The main technological measures of the preparation method:
[0039] (1) The molten iron goes to the desulfurization station for desulfurization of pure magnesium particles. After desulfurization, the sulfur content in the molten iron is guaranteed to be ≤0.020%.
[0040] (2) Converter smelting, after the converter smelting is completed, add synthetic slag in the ladle before tapping at a rate of 5kg / t steel, add 0.42kg / t ferroniobium during tapping, and add a modifier on the surface of the slag after tapping 1kg / t added. The composition of the synthetic slag, by weight percentage, is CaO: 48%, SiO 2 : 12%, Al 2 o 3 : 35%, MgO: 10%. The composition of the modifying agent is CaO: 30% by weight, SiO 2 : 10%, Al 2 o 3 : 30%, MgO: 15%, Al: 15%. Those skilled in t...
Embodiment 2
[0046] The composition of the synthetic slag described in step 1) is CaO: 55% by weight percentage, SiO 2 : 13%, Al 2 o 3 : 22%, MgO: 10%. The composition of the modifying agent is CaO: 40% by weight, SiO 2 : 8%, Al 2 o 3 : 35%, MgO: 6%, Al: 14%.
Embodiment 3
[0048] The composition of the synthetic slag described in step 1) is CaO: 50% by weight percentage, SiO 2 : 10%, Al 2 o 3 : 35%, MgO: 8%. The composition of the modifying agent is CaO: 50% by weight, SiO 2 : 5%, Al 2 o 3 : 20%, MgO: 7%, Al: 18%.
[0049] Table 1: Chemical Composition Weight % of Steel
[0050] Example
C
Si
mn
P
S
Nb
1
0.14
0.19
1.29
0.015
0.012
0.022
2
0.14
0.22
1.30
0.014
0.009
0.022
3
0.14
0.18
1.26
0.010
0.012
0.022
[0051] Table 2 Converter smelting process record table
[0052]
[0053] Table 3: Refining process record sheet
[0054]
[0055] Table 4: Continuous casting process record sheet
[0056]
[0057] Table 5: Record table of mechanical properties of rolled products
[0058]
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Abstract
The invention relates to low temperature-resisting H-shaped steel and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.12-0.22 percent of C, 0.10-0.40 percent of Si, 1.1-1.50 percent of Mn, not more than 0.025 percent of P, not more than 0.025 percent of S, 0.02-0.05 percent of Nb and the balance of iron and trace impurities. The preparation method of the low temperature-resisting H-shaped steel comprises the following steps of: desulfurizing, smelting by using a 120-ton top and bottom combined blown converter, refining by using an LF (Ladle Furnace), continuously casting shaped blanks and rolling large H-shaped steel, wherein after the refinement outside the furnace, the oxygen content in molten steel is not more than 10ppm, and in the continuously-casting process, the superheat degree is controlled to be 20-30 DEG C, the specifications of casting blanks are 555*440*90, 750*370*90 and 1024*390*90, the soaking temperature of a heating furnace is 1200-1300DEG C, the initial rolling temperature at the outer side of a flange is 1100-1180 DEG C, the temperature at the center of a web plate is 1100-1170 DEG C, the final rolling temperature at the outer side of the flange is 850-960 DEG C, the temperature at the center of the web plate is 800-880 DEG C, and the H-shaped steel with the specification of H250-H900 isrolled.
Description
technical field [0001] The invention relates to metallurgical technology, and belongs to low-temperature-resistant low-alloy high-strength structural steel, in particular to a hot-rolled H-shaped steel for drilling platform structures in alpine regions and a preparation method thereof. Background technique [0002] H-beams for low-temperature resistant structures are mainly used in buildings, ships, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other high-load steel structures in alpine regions. This steel contains less non-metallic materials and has the characteristics of impact resistance under low temperature conditions. [0003] Chinese invention patent document CN101255527A (application number 200810014488.8) discloses a boron-added H-shaped steel with good low-temperature impact toughness and its preparation method. The steel composition weight percentage of this invention is: C0.08~0.20%, Mn1.0...
Claims
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