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Soft magnetic structural steel resisting salt fog corrosion and its making process

A manufacturing method and technology for structural steel, applied in the direction of metal rolling, etc., can solve problems such as insufficient resistance to salt spray corrosion

Active Publication Date: 2007-01-03
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0009] The object of the present invention is to provide a kind of salt spray corrosion-resistant soft magnetic structural steel suitable for use in coastal areas with high salt spray and its manufacturing method. The technical problem to be solved is to solve the salt spray corrosion resistance of existing soft magnetic structural steel plates ( Mainly resistant to Cl - Ion corrosion) is seriously insufficient. While the soft magnetic structural steel plate has high strength, high and low temperature impact toughness, good weldability and excellent electromagnetic properties, it must also have high salt spray corrosion resistance, especially suitable for high salt foggy coastal area

Method used

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Embodiment

[0059] Embodiment: The manufacturing process of the soft magnetic structural steel plate of the present invention is as follows: smelting in a vacuum induction furnace in a laboratory, and casting starts immediately after the composition of the molten steel reaches the target composition, and the casting temperature of the molten steel is 15252-1550°C. The soaking time of the slab in the heating furnace = plate thickness (mm) × (0.5-1.0) min / mm, the soaking temperature is 1050°C-1100°C, the hot rolling adopts 9-pass rolling process, and the cumulative reduction rate is 70 % to 90%, the finish rolling temperature is 800°C to 850°C, the transfer time between the end of finish rolling and the start of accelerated cooling is 15s to 30s, the surface temperature of the ingot is above 800°C when the accelerated cooling starts, and the accelerated cooling rate is 10°C / s~30°C / s, the stop cooling temperature is 500°C~600°C, then slowly cool to 300°C (slow cooling rate ≤ 1°C / min), and the...

Embodiment 3

[0062] Embodiment 3 is that the metallographic structure of the present invention C is shown in accompanying drawing

[0063]

[0064] ◆Welding heat simulation parameters: single cycle, simulated peak temperature 1350℃, t 8 / 5 = 50 seconds.

[0065]

[0066] The maglev express train system is a fast, safe, efficient and environment-friendly means of transportation. At present, the fastest maglev train in the world has reached a speed of over 560 km / h. As a fast, safe, efficient and environment-friendly means of transportation, the maglev express train system is more and more favored by people, and there will be a climax in the construction of the maglev express train system at home and abroad; as a key component of the maglev express train system, the side guide Soft magnetic structural steel plates, especially high-performance soft magnetic structural steel plates used in coastal areas, will have broad market prospects.

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Abstract

The present invention relates to soft magnetic structural steel, and is especially one kind of soft magnetic structural steel resisting salt fog and its making process. The present invention solves the technological problem of raising the salt fog corrosion resistance of soft magnetic structural steel. The soft magnetic structural steel consists of C 0.020-0.040 wt%, Si 1.40-1.60 wt%, Mn 0.40-0.80 wt%, P not more than 0.015 wt%, S not more than 0.005 wt%, Als 0.040-0.060 wt%, Cu 0.20-0.50 wt%, Ti 0.035-0.055 wt%, N not more than 0.0035 wt%, Ni 0.80- 1.20 wt%, and Ca or REM 10-60ppm, except Fe and inevitable impurities. Its making process includes continuous casting, re-crystallization controlling rolling, accelerated cooling or intermittent direct quenching, and subsequent slow cooling step. The present invention is especially suitable for use as side guide plate in magnetic suspension train track beam in high salt fog area.

Description

technical field [0001] The present invention relates to a kind of soft magnetic structural steel and its manufacturing method, and the present invention particularly relates to a kind of special steel for magnetic levitation track beam, which has high strength, excellent electromagnetic performance, low temperature toughness, good weldability, and high strength. Magnetic flux density, high resistivity, excellent anti-magnetic aging resistance, atmospheric corrosion resistance, especially suitable for use in coastal areas, and good salt spray corrosion resistance (mainly Cl - Ion corrosion) soft magnetic structural steel plate, especially suitable for use as side guide plates on the track beams of maglev trains in coastal areas with high salt spray. Background technique [0002] Ordinary soft magnetic structural steel plates for magnetic levitation first appeared in Germany, and German Thyssen Steel AG applied for patents US 4350525 Magnetic sus...

Claims

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Application Information

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IPC IPC(8): C22C38/16B22D11/00B21B1/22C21D8/00C21D6/00
Inventor 刘自成丁建华
Owner BAOSHAN IRON & STEEL CO LTD
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