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Bridge structural steel and production method thereof

A bridge structure and production method technology, applied in the direction of temperature control, process efficiency improvement, etc., can solve the problem that bridge structural steel cannot meet low temperature impact resistance

Active Publication Date: 2011-09-28
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the bridge structural steel provided in the prior art cannot meet the requirements of excellent low temperature impact resistance, earthquake resistance and other comprehensive properties.

Method used

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  • Bridge structural steel and production method thereof

Examples

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example 1

[0054] 1. The chemical composition of the bridge structural steel according to Example 1 of the present invention comprises by weight: C: 0.13%, Si: 0.34%, Mn: 1.57%, S: 0.007%, P: 0.015%, Nb: 0.045%, Ti: 0.025%, V: 0.054%, Ni: 0.20%, Als: 0.034%, N≤40×10 -6 , O≤40×10 -6 、H≤2×10 -6 .

[0055] 2, according to the production method of the bridge structural steel of example 1 of the present invention:

[0056] The production process includes molten iron pretreatment, converter smelting with combined top and bottom blowing, LF refining, RH refining, continuous casting of slabs, slow cooling of billets, rolling of 4300mm wide and thick plates, slow cooling of finished products, and normalizing heat treatment. The operation steps are as follows:

[0057] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.008%, the temperature is 1250°C, and the slag on the surface of the molten iron is removed after desulfuri...

example 2

[0063] 1. The chemical composition of the bridge structural steel according to Example 2 of the present invention comprises by weight: C: 0.14%, Si: 0.34%, Mn: 1.41%, S: 0.006%, P: 0.012%, Nb: 0.039%, Ti: 0.017%, V: 0.040%, Ni: 0.19%, Als: 0.024%, N≤40×10 -6 , O≤40×10 -6 、H≤2×10 -6 .

[0064] 2, according to the manufacturing method of the bridge structural steel of example 2 of the present invention:

[0065] The production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, slab slow cooling, 4300mm wide and thick plate rolling, finished product slow cooling, and normalizing heat treatment. The operation steps are as follows:

[0066] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.005%, the temperature is 1267°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated ...

example 3

[0072] 1. The chemical composition of the bridge structural steel according to Example 3 of the present invention comprises by weight: C: 0.16%, Si: 0.28%, Mn: 1.40%, S: 0.006%, P: 0.013%, Nb: 0.025%, Ti: 0.021%, V: 0.025%, Ni: 0.15%, Als: 0.030%, N≤40×10 -6 , O≤40×10 -6 、H≤2×10 -6 .

[0073] 2, according to the production method of the bridge structural steel of example 3 of the present invention:

[0074] The production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, slab slow cooling, 4300mm wide and thick plate rolling, finished product slow cooling, and normalizing heat treatment. The operation steps are as follows:

[0075] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.013%, the temperature is 1310°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated mol...

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Abstract

The invention discloses bridge structure steel and a production method thereof. The production method comprises: pretreating molten iron; smelting in a top and bottom combined blown converter; refining in a ladle furnace (LF); performing Ruhrstahl Heraeus (RH) refining; continuously casting plate blanks; rolling wide and thick plates; and performing normalizing heat treatment. The produced bridge structural steel comprises the following chemical components in percentage by weight: 0.11 to 0.16 percent of C, 0.10 to 0.45 percent of Si, 1.35 to 1.70 percent of Mn, less than or equal to 0.010 percent of S, less than or equal to 0.020 percent of P, 0.025 to 0.060 percent of Nb, 0.008 to 0.030 percent of Ti, 0.025 to 0.080 percent of V, 0.10 to 0.50 percent of Ni, 0.015 to 0.060 percent of Als, less than or equal to 40*10<-6> of N, less than or equal to 40*10<-6> of O, less than or equal to 2*10<-6> of H and the balance of iron and inevitable impurities, wherein Als represents Alsol. The lower yield strength of the steel plates produced by the method is not less than 370MPa, the tensile strength of the steel plates is not less than 510MPa, the yield to strength ratio of the steel plates is not more than 0.75, the percentage elongation after fracture of the steel plates is not less than 30 percent, the longitudinal AKv of the steel plates at -40 DEG C is not less than 240J, and the steel plates meet the requirements for manufacturing high-speed multi-track railway bridges and can be promoted to be used in engineering structures such as building, transport and ocean platforms.

Description

technical field [0001] The invention relates to a bridge structural steel and a production method thereof, more specifically, the invention relates to a low-temperature impact-resistant high-performance bridge structural steel and a production method thereof. Background technique [0002] With the rapid development of railways, highways, long-span and long-span bridge construction, the demand for bridge structural steel has been greatly stimulated; The demand for bridges is gradually increasing, and the requirements for dead load of bridges are also increasing, especially for bridge structural steels with low temperature impact toughness. [0003] However, the bridge structural steel provided in the prior art cannot meet the comprehensive performance requirements such as excellent low-temperature impact resistance and earthquake resistance. Contents of the invention [0004] The object of the present invention is to provide a low-temperature impact-resistant high-performa...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21C7/064C21C7/06C21C7/10B21B37/74
CPCY02P10/20
Inventor 杨建勋周平刘菲王建景李灿明高立福李生根李广艳
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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