Soft magnetic structural steel and manufacturing method thereof

A manufacturing method and technology for structural steel, applied in the field of structural steel plates for rails, can solve problems such as inability to guarantee ≥27J, poor weldability, hidden dangers of train operation, etc.

Inactive Publication Date: 2004-01-28
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0002] Ordinary soft magnetic structural steel plates for magnetic levitation first appeared in Germany. In 1999, German Thyssen Steel AG applied for US Patent 6287395 in the United States "soft magnetic steel capable of high-energy welding and its application on magnetic levitation rail components", revealing the soft magnetic In the process of the invention of structural steel plates, US Patent 6287395 describes the role of various alloy elements in steel, but the actual impact toughness is low, especially at low temperature. The transverse impact energy at 0°C is between 12J and 57J, which may bring hidden dangers to train operation. At the same time, the magnetic induction is not high, B40 is only about 1.60T, especially under low magnetic field, the magnetic induction of B3 is only 0.60T, the electromagnetic conversion efficiency is low, the eddy current loss is large, and the power loss is large, which cannot meet the increasingly stringent environmental protection requirements
[0003] Baosteel applied for the Chinese patent ZL01126937.5 "High-performance soft magnetic steel for maglev trains" in 2001. The performance of the soft magnetic structural steel plate used for maglev track beams has been greatly improved compared with the German invention, but its magnetic flux density and resistivity And low temperature impact toughness is still not high enough (B40 is about 1.60T~1.61T, B3 is about 0.9T~1.00T, resistivity ρ is about 0.39~0.40μΩm, 0℃Akv≥140J), especially when the impact toughness is lower than -10℃ , cannot guarantee ≥27J, and the weldability is also poor. The welding line energy can only be controlled at ≤12kJ / cm to ensure the heat-affected zone (HAZ) 0℃Akv≥27J. Therefore, this kind of soft magnetic structural steel plate is used in the colder north There are still major security risks

Method used

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Effect test

Embodiment 2： and manufacture approach ，：Fe、C、Si、Mn、P、S、Als、Cr、Cu、Ti、N、Ni、Ca，：C 0.012、Si 1.66、Mn 0.69、P 0.010、S 0.0034、Als 0.017、Cr 0.47、Cu 0.33、Ti 0.011、N 0.0038、Ni 0.47、Ca 0.0036、Fe and 96.32。：1550℃，90，1150℃，4，42％，940℃，3，68％，～860℃， to 。960℃，22min～25min， to 。 to ：σs382Mpa、σb482Mpa、δ37％、ρ0.440μΩm、279J(-20℃)、343J(-20℃)、21μm、B3 1.39T、B40 1.68T、HAZ87J(-20℃)。 Embodiment 3： and manufacture approach ，：Fe、C、Si、Mn、P、S、Als、Cr、Cu、Ti、N、Ni、REM，：C 0.034、Si 1.57、Mn 0.67、P 0.011、S 0.0022、Als 0.020、Cr 0.58、Cu 0.29、Ti 0.009、N 0.0034、Ni 0.46、REM 0.0040、Fe and 96.35。：1570℃，85，1160℃，4，44％，960℃，3，66％，～875℃， to 。955℃，22min～25min， to 。 to ：σs382Mpa、σb488Mpa、δ33％、ρ0.430μΩm、256J(-20℃)、294J(-20℃)、20μm、B3 1.17T、B40 1.66T、HAZ67J(-20℃)。 Embodiment 4： and manufacture approach ，：Fe、C、Si、Mn、P、S、Als、Cr、Cu、Ti、N、Ni、Ca，：C 0.030、Si 1.64、Mn 0.63、P 0.011、S 0.0028、Als 0.018、Cr 0.44、Cu 0.29、Ti 0.009、N 0.0032、Ni 0.46、Ca 0.0041、Fe and 96.46。：1580℃，90，1130℃，4，42％，940℃，3，70％，～865℃， to 。935℃，22min～25min， to 。 to ：σs405Mpa、σb497Mpa、δ31％、ρ0.430μΩm、251J(-20℃)、294 J(-20℃)、27μm、B3 1.19T、B40 1.66T、HAZ61J(-20℃)。 Embodiment 5

[0047] 4. Specific implementation methods: Example 1: soft magnetic structural steel and its manufacturing method, the constituent elements include: Fe, C, Si, Mn, P, S, Als, Cr, Cu, Ti, N, Ni, REM, element Composition weight ratio: C 0.032, Si 1.66, Mn 0.65, P 0.011, S 0.0042, Als 0.011, Cr 0.48, Cu 0.29, Ti 0.011, N 0.0039, Ni 0.49, REM 0.0038, Fe and trace inclusions 96.35. The production process of the present invention is as follows: the casting temperature of molten steel is 1560°C, the steel ingot is soaked in the heating furnace for 100 minutes, the soaking temperature is 1170°C, the rough rolling adopts 4-pass rolling process, the cumulative reduction rate is 43%, the finish rolling The rolling start temperature is 950°C, 3-pass rolling process is adopted, the cumulative reduction rate is 65%, the final rolling temperature is ~870°C, and the rolling is naturally air-cooled to room temperature. The normalizing temperature of the hot-rolled sheet is 950°C, and the norma...

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Abstract

The present invention relates to a structure steel plate for track, in particular, it relates to a soft-magnetic structure steel for magnetic suspension track and its manufacture method. Its composition comprises: C 0.010%-0.040%, Si 1.0%-2.0%, Mn 0.60%-1.00%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als 0.005%-0.020%, Cr is less than 0.60%, Cu 0.20-0.60%, Ti 0.005%-0.02%, N is less than or equal to 0.010%, Ni is less than or equal to 1.00%, Ca or REM is less than or equal to 0.010% and the rest is Fe and unavoidable impurity, in which the REM can be substituted for element Ca. Its manufacture process includes continuous casting process, hot-rolling process and normalizing process.

Description

1. Technical field: [0001] The invention relates to a structural steel plate for a track, in particular to a steel plate for a magnetic levitation track with high strength, high low-temperature toughness, high magnetic induction, high resistivity, and excellent anti-magnetic timeliness, atmospheric corrosion resistance and welding properties. Permanent soft magnetic structural steel and its manufacturing method. 2. Background technology: [0002] Ordinary soft magnetic structural steel plates for magnetic levitation first appeared in Germany. In 1999, German Thyssen Steel AG applied for US Patent 6287395 in the United States "soft magnetic steel capable of high-energy welding and its application on magnetic levitation rail components", revealing the soft magnetic In the process of the invention of structural steel plates, US Patent 6287395 describes the role of various alloy elements in steel, but the actual impact toughness is low, especially at low temperature. The transve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16
Inventor 刘自成张永嘉
Owner BAOSHAN IRON & STEEL CO LTD
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