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Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof

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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 low nitrogen and oxygen content. The process uses aluminum deoxidation to ensure a good deoxidation effect. Deoxygenation is not feasible

Method used

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  • Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof
  • Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof
  • Hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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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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Application Information

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IPC IPC(8): C22C38/12C21C7/06B21B37/74
Inventor 张婕袁鹏举宋玉卿付常伟邓存善李超
Owner SHANDONG IRON & STEEL CO LTD
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