Soft magnetic structure steel possessing good low temperature toughness and easy welding preformance and its manufacturing method

A technology of low temperature toughness and manufacturing method, applied in magnetic materials, magnetic objects, electrical components, etc., can solve the problems of large ineffective loss, low electromagnetic conversion efficiency, insufficient magnetic flux density, resistivity and low temperature impact toughness, etc.

Inactive Publication Date: 2004-10-06
TONGJI UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the significantly high content of C, Als, and Cr, and the significantly low Mn content, the actual impact toughness of soft magnetic steel is low, the resistivity is low, and the strength is low, especially at low temperatures below 0°C (especially below -20°C) The impact toughness is very low, and the transverse impact energy at 0°C is between 12J and 57J; the magnetic induction is not high, B40 is only about 1.60T, and the magnetic induction is low under low magnetic field, B3 is only 0.60T, the electromagnetic conversion efficiency is low, and the ineffective loss is large , cannot adapt to the increasingly stringent environmental protection requirements; and the weldability is relatively poor, so it

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  • Soft magnetic structure steel possessing good low temperature toughness and easy welding preformance and its manufacturing method
  • Soft magnetic structure steel possessing good low temperature toughness and easy welding preformance and its manufacturing method
  • Soft magnetic structure steel possessing good low temperature toughness and easy welding preformance and its manufacturing method

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Embodiment Construction

[0078] The examples of the present invention are shown in Table 1, and the comparison of their mechanical properties with the comparative examples is shown in Table 2.

[0079] The manufacturing process of the soft magnetic structural steel plate of the present invention is as follows: smelting in a vacuum induction furnace, after the composition of molten steel reaches the target composition, adding Mg alloy for final deoxidation, and immediately starting casting, the casting temperature of molten steel is 1560°C-1580°C. The steel ingot is soaked in the heating furnace for 80 minutes, the soaking temperature is 1100°C~1160°C, the hot rolling adopts 6-pass rolling process, the cumulative reduction rate is 75%~85%, and the final rolling temperature is 890°C~910°C, The transfer time between the end of final rolling and the start of accelerated cooling is 15s~30s. When the accelerated cooling starts, the surface temperature of the steel plate is above 880°C, the accelerated coolin...

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Abstract

An easily weldable soft-magnetic structure steel with better low-temp toughness contains C (0.01-0.02 wt.%), Si (1-2), Mn (0.6-1.0), P (0-0.015), S (0-0.008), Al (0.001-0.01), Cr (0-0.6), Cu (0.2-0.6), Ti (0.005-0.02), Ni (0-1.0), Mg (0.001-0.008), [0] (0.001-0.008), N (0.001-0.006), Ca or REM (0-0.005) and Fe (rest). Its advantages are high strength, low-temp (-30- -40 deg.C) impact toughness, weldability, resistivity and magnetic flux density, better resistance to magnetic ageing and atmosphere corrosion, and low cost.

Description

technical field [0001] The invention relates to a soft magnetic structural steel and a manufacturing method thereof, in particular to a soft magnetic structural steel plate for manufacturing a track beam of a maglev train and a manufacturing method thereof. Background technique [0002] 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 environmentally friendly means of transportation, it is increasingly favored by people. [0003] Magnetic levitation side-guided soft magnetic structural steel plate is the key component of the maglev guide rail. It can not only absorb the bearing capacity, guiding force and driving force in the maglev track, but also has high magnetic flux density, high resistivity, and good aging resistance. Sex, anti-magnetic timeliness and good weldability, so it has become a hig...

Claims

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Application Information

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IPC IPC(8): C22C38/16H01F1/147
Inventor 刘自成吴祥明丁建华黄靖宇
Owner TONGJI UNIV
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