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600MPa grade high-strength weathering steel and preparation method thereof

A weather-resistant steel and high-strength technology, applied in metal rolling and other directions, can solve the problems of high cost and difficult control, and achieve the effect of low cost, simple chemical composition and low alloying cost

Inactive Publication Date: 2008-07-23
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology also has the disadvantages of difficult production process control and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Process flow: 150-ton electric furnace smelting, ladle furnace refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling.

[0021] Among them, the main chemical composition of molten steel after refining is: C: 0.045wt%, Si: 0.10wt%, Mn: 1.4wt%, P: 0.030wt%, S: 0.002wt%, Cu: 0.5wt%, Cr: 0.30 wt%, Ni: 0.35 wt%, Ti: 0.060 wt%, Nb: 0.05 wt%, Alt: 0.030 wt%.

[0022] Thin slab continuous casting and rolling process parameters are: the thin slab continuous casting process is continuous casting at a casting speed of 5.0m / min, the temperature of casting slab entering the furnace is 1050°C, the temperature of exiting the furnace is 1180°C, the temperature of starting rolling is 1110°C, and the temperature of finishing rolling is 1110°C. The temperature is 860°C, and the coiling temperature is 580°C.

[0023] The performance of the steel strip is shown in Table 1.

[0024] The perform...

Embodiment 2

[0027] Process flow: 150-ton electric furnace smelting, ladle furnace refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling.

[0028] Among them, the main chemical components of molten steel after refining are: C: 0.05wt%, Si: 0.15wt%, Mn: 1.3wt%, P: 0.025wt%, S: 0.006wt%, Cu: 0.3wt%, Cr: 0.5 wt%, Ni: 0.25 wt%, Ti: 0.07 wt%, Nb: 0.04 wt%, Alt: 0.040 wt%.

[0029] Thin slab continuous casting and rolling process parameters are as follows: the thin slab continuous casting process is continuous casting at a pulling speed of 4.5m / min, the casting temperature is 1000°C, the exit temperature is 1165°C, the starting rolling temperature is 1090°C, and the final rolling temperature is 1000°C. The temperature is 880°C, and the coiling temperature is 590°C.

[0030] The properties of the obtained steel strip are shown in Table 2.

[0031] The performance of table 2 steel belt

[0032] ...

Embodiment 3

[0035] Process flow: 150-ton electric furnace smelting, ladle furnace refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling.

[0036] Among them, the main chemical components of molten steel after refining are: C: 0.065wt%, Si: 0.29wt%, Mn: 1.5wt%, P: 0.015wt%, S: 0.008wt%, Cu: 0.20wt%, Cr: 0.70 wt%, Ni: 0.15 wt%, Ti: 0.079 wt%, Nb: 0.035 wt%, Alt: 0.05 wt%.

[0037] Thin slab continuous casting and rolling process parameters are: the thin slab continuous casting process is continuous casting at a casting speed of 4.0m / min. The temperature is 900°C, and the coiling temperature is 610°C.

[0038] The properties of the resulting steel strip are shown in Table 3.

[0039] The performance of table 3 steel belt

[0040]

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Abstract

The invention discloses a 600MPa high strength weathering steel and the manufacturing method, which is characterized in that: the 600MPa high strength weathering steel adopts electric stove-thin slab continuous casting and rolling process for preparation; the main chemical components of the refined molten steel for preparing the high strength weathering steel are: C: 0.045 wt % to 0.07wt%, Si: 0.10 wt % to 0.29wt%, Mn: 0.8 wt % to 1.5wt%, P: 0.005 wt% to 0.030wt%, S: 0.002 wt% to 0.008 wt%, Cu: 0.20 wt% to 0.5wt%, Cr: 0.3 wt% to 0.7wt%,Ni: 0.15 wt % to 0.35wt%, Ti: 0.06 wt% to 0.079wt%, Nb: 0.035 wt% to 0.050wt%, Alt: 0.025 wt% to 0.050wt%. The 600MPa high strength weathering steel has the advantages of low cost, strong competitiveness, cold formability, good welding performance and application to tower frame, heavy duty automobile, bridge, container, railway vehicle manufacture.

Description

technical field [0001] The invention belongs to the field of low-alloy steel and its manufacture, and in particular relates to a 600MPa grade high-strength weathering steel and its preparation method based on an electric furnace-thin slab continuous casting and rolling process. Background technique [0002] High-strength weather-resistant steel refers to weather-resistant steel (atmospheric corrosion-resistant steel) with a yield strength ≥ 450 MPa. The development and production of high-strength weathering steel is mainly to meet the upgrading needs of steel used in industries such as new-generation containers, railway freight cars, high-speed train cars, communication and transmission towers, bridges, and heavy-duty automobile manufacturing, to achieve increased strength, reduced self-weight, and energy saving. consumption safety and environmental protection requirements. With the development of my country's economy, the logistics industry is growing rapidly. High-strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50B21B1/46
Inventor 毛新平徐志如林振源李春艳
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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