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Cr-free high-performance weatherable bridge steel and preparation method thereof

A technology capable of weathering and bridge steel, used in metal rolling, manufacturing tools, metal rolling, etc., to achieve excellent mechanical properties, improve atmospheric corrosion performance and low temperature toughness, and reduce carbide formation.

Inactive Publication Date: 2012-07-04
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the existing corrosion-resistant steel, the present invention provides a Cr-free high-performance weather-resistant bridge steel and its preparation method, aiming to provide a low-cost and good comprehensive mechanical properties, welding performance and does not contain the toxic element Cr Marine Atmospheric Corrosion Resistant Steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Firstly, a 200kg vacuum induction furnace was used to smelt test steel, the chemical composition of which was shown in Table 1, and then casting was carried out to form a steel ingot. ℃, keep warm for 30min;

[0027] Then adopt the two-stage rolling scheme shown in Table 2, the first stage is rough rolling, the rolling temperature is 1070°C, and the cumulative reduction rate is 50%, the second stage is finish rolling, the rolling temperature is 950°C, and the final rolling temperature is 840°C, cumulative reduction rate 70%, after rolling, spray water at a cooling rate of 16°C / s to 507°C, and then air cool to room temperature.

Embodiment 2

[0029] Firstly, a 200kg vacuum induction furnace was used to smelt test steel, the chemical composition of which was shown in Table 1, and then casting was carried out to form a steel ingot. ℃, keep warm for 30min;

[0030] Then adopt the two-stage rolling scheme shown in Table 2. The first stage is rough rolling, the rolling temperature is 1060°C, and the cumulative reduction rate is 50%. The second stage is finish rolling, the rolling temperature is 950°C, and the final rolling temperature is 830°C, cumulative reduction rate 70%, after rolling, spray water at a cooling rate of 15°C / s to 530°C, and then air cool to room temperature.

[0031] Table 1 Chemical composition of the steels of Examples 1 and 2 of the present invention (mass percentage, %)

[0032] steel number C Si mn P S Ni Mo Cr Cu Nb Ti Al margin Example 1 0.045 0.25 0.71 0.02 0.007 0.65 - - 0.30 0.065 0.012 0.016 Fe and impurities Example 2 0.03 0.22 0.75...

Embodiment 3

[0046] First, 200kg vacuum induction furnace is used to smelt molten steel. The chemical composition is: C 0.02%, Si0.30%, Mn 1.00%, P 0.18%, S 0.010%, Cu 0.20%, Ni 0.30%, Nb 0.04%, Ti 0.015%, Al 0.02%, the balance is Fe and impurities, and then cast to form a steel ingot. The steel ingot is billeted and hot forged into a billet with a cross-section of 80 mm×80 mm. The billet is heated to 1150 ° C and kept for 60 minutes;

[0047] Then adopt the two-stage rolling scheme shown in Table 2. The first stage is rough rolling, the rolling temperature is 150°C, and the cumulative reduction rate is 55%. The second stage is finish rolling, the rolling temperature is 900°C, and the final rolling temperature is 800°C, cumulative reduction rate 70%, after rolling, spray water at a cooling rate of 16°C / s to 480°C, and then air cool to room temperature.

[0048] The yield strength is 465MPa, the tensile strength is 542MPa, the elongation is 29%, the specific impact energy at -40°C is 280J, ...

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Abstract

The invention belongs to the manufacture field of low alloy steel, in particular to Cr-free high-performance weatherable bridge steel and a preparation method thereof. The Cr-free high-performance weatherable bridge steel provided by the invention contains the following chemical ingredients in percent by mass: 0.02-0.05% of C, 0.20-0.30% of Si, 0.6-1.00% of Mn, no more than 0.02% of P, no more than 0.010% of S, 0.20-0.40% of Cu, 0.30-0.80% of Ni, 0.04-0.07% of Nb, 0.005-0.015% of Ti, no more than 0.02% of Al and the balance of Fe and impurities. The Cr-free high-performance weatherable bridgesteel provided by the invention is formed by adopting two-stage rolling, wherein the rolling temperature of rough rolling in a first stage is 1,050-1,070 DEG C, the rolling temperature of fine rolling in a second stage is 900-950 DEG C, and the temperature for final rolling is 800-850 DEG C. The Cr-free high-performance weatherable bridge steel provided by the invention has excellent comprehensive mechanical properties and welding properties, does not contain the toxic element Cr, and meanwhile, has excellent resistance to atmospheric marine corrosion.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a Cr-free high-performance weather-resistant bridge steel and a preparation method thereof. Background technique [0002] With the development of resource-saving and environment-friendly society in our country, more and more attention has been paid to the corrosion resistance of bridge steel. The development of corrosion-resistant bridge steel can not only prolong the overall service life of bridges, but also reduce the Total cost. The coastline of my country's mainland is as long as 18,000km, and the coastal areas are usually economically developed areas. With the rapid development of bridge construction in these areas, especially the construction of cross-sea bridges, the construction of various bridges has also driven the demand for bridge steel. These projects are increasing While the demand for bridge steel has increased, higher requirements have been...

Claims

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Application Information

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IPC IPC(8): C22C38/16B21B37/00
Inventor 付贵勤夏政海朱苗勇张永东高新亮曹波
Owner NORTHEASTERN UNIV
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