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Non-magnetic high manganese steel sheet with high strength and manufacturing method thereof

a high-tensile steel, non-magnetic technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of loss of electrical current high cost of stainless steel, etc., to increase the stability of austenite, high degree of formability, and high stability of austeni

Inactive Publication Date: 2015-07-30
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent provides a high manganese steel sheet that has high stability and non-magnetic properties. The addition of aluminum (Al) helps prevent the formation of carbides and further increases the stability of austenite, resulting in a highly formable and strong steel sheet. With its sufficient rigidity, the steel sheet can be used to form structural members of large transformers.

Problems solved by technology

However, such stainless steel is expensive and may not have sufficient strength.
However, ferritic and martensitic stainless steels have high-quality magnetic properties that cause eddy currents and thus the loss of electrical currents.
In addition, ferritic or martensitic stainless steel is very expensive.

Method used

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  • Non-magnetic high manganese steel sheet with high strength and manufacturing method thereof
  • Non-magnetic high manganese steel sheet with high strength and manufacturing method thereof

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Experimental program
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Effect test

embodiment 1

[0048]Steel slabs having the following compositions were reheated to 1200° C., and a finish hot rolling was performed on the steel slabs at 900° C. to form steel sheets. Thereafter, the steel sheets were coiled at 500° C. and then cold-rolled with a reduction ratio of 50%. The cold-rolled steel sheets were continuously annealed at 800° C.

TABLE 1No.CMnSiPSAlTiBN10.6117.960.010.090.0040.010.0660.0020.009720.6118.300.010.090.0031.500.0860.0020.008730.6118.500.010.090.0032.690.0830.0030.006540.6114.540.010.100.0050.010.0770.0020.009850.6115.100.010.090.0061.510.0850.0020.008160.6115.540.010.090.0051.970.0850.0020.006970.6111.580.010.100.0050.010.0680.0020.009580.6111.630.010.100.0061.460.0870.0020.003990.6112.410.010.100.0041.950.0920.0020.0069

[0049]The yield strength, tensile strength, and elongation of each of the steel sheets were measured a shown in Table 2 so as to inspect physical properties of the steel sheets.

TABLE 2No.Yield strength (MPa)Tensile strength (MPa)Elongation (%)1484...

embodiment 2

[0055]Steel slabs having the following compositions (weight %) were reheated to 1200° C., and a finish hot rolling was performed on the steel slabs at 900° C. to form steel sheets. Thereafter, the steel sheets were coiled at 500° C. and then cold-rolled at a reduction ratio of 50%. The cold-rolled steel sheets were continuously annealed at 800° C.

TABLE 4Sample No.CMnPSAlSiTiBN10.6118.00.0910.0040.010.010.06620.00210.009720.6118.30.0870.00341.490.010.08570.00230.008730.6018.30.0870.00241.930.010.08560.00230.007840.6118.50.0900.00272.680.010.08330.00250.006550.6114.50.0970.00510.020.010.07660.00210.009860.6115.10.0940.00551.510.010.08540.00240.008170.6115.50.0940.00491.970.010.08460.00240.006980.6111.60.1010.00530.010.010.06840.0020.009590.6111.60.1020.00571.450.010.08680.00230.0039100.6112.40.0980.00391.940.010.09150.00220.0069110.6118.30.0920.00410.510.010.06620.00210.0037120.6218.40.0910.00421.020.010.08570.00230.0087130.6118.20.0930.00411.210.010.08560.00230.0078140.6118.30.0920.0...

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Abstract

The present invention relates to a non-magnetic high manganese steel sheet with high-strength, which has superior strength and moldability, and at the same time, can obtain superior non-magnetic characteristics, and a method for manufacturing the same.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a non-magnetic high manganese steel sheet having a high degree of strength for use as a material for heavy electrical machinery such as switchboards and transformers.BACKGROUND ART[0002]In general, materials for equipment such as switchboards and transformers are required to have high degrees of strength as well as good non-magnetic properties.[0003]In the related art, stainless steel having high nickel and chromium contents and satisfying the requirements for high strength and non-magnetivity is used in such applications. However, such stainless steel is expensive and may not have sufficient strength.[0004]Ferritic or martensitic stainless steel may be used as alternatives to satisfy the requirement for high strength. However, ferritic and martensitic stainless steels have high-quality magnetic properties that cause eddy currents and thus the loss of electrical currents. In addition, ferritic or martensitic stainless steel is v...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D9/46C21D6/00C22C38/00C22C38/06C22C38/04C22C38/02C21D8/02C22C38/14
CPCC21D9/46C21D8/0263C21D8/0226C21D8/0236C21D8/0205C22C38/001C22C38/14C22C38/06C22C38/04C22C38/02C22C38/002C21D6/005
Inventor KIM, SUNG-KYUCHIN, KWANG-GEUNOH, PII-YONGHWANG, HYUN-GYU
Owner POHANG IRON & STEEL CO LTD
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