Wire rod and steel wire having superior magnetic characteristics, and method for manufacturing same

• US 9,728,332 B2
• Filed: 11/09/2011
• Issued: 08/08/2017
• Est. Priority Date: 11/10/2010
• Status: Expired due to Fees

• Current Assignee: Posco Holdings Incorporated
• Original Assignee: Posco Holdings Incorporated
• Inventors: Kim, Dong-Hyun, Shin, Woo-Gi, Lee, You-Hwan
• Primary Examiner(s): King, Roy
• Assistant Examiner(s): KIECHLE, CAITLIN ANNE
• Application Number:
  US13/824,428
• Publication Number:
  US 20130189148A1
• Time in Patent Office: 2,099 Days
• CPC Class Codes: B21C 1/00 Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
• CPC Class Codes: C21D 8/06 during manufacturing of rods or wires
• CPC Class Codes: C21D 8/065 of ferrous alloys
• CPC Class Codes: C21D 8/12 during manufacturing of articles with special electromagnetic properties
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: H01F 1/01 of inorganic materials H01F1/44 takes precedence
• CPC Class Codes: H01F 1/143 in the form of wires H01F1/147 takes precedence
• CPC Class Codes: H01F 41/02 for manufacturing cores, coils, or magnets H01F41/14 takes precedence; for dynamo-electric machines H02K15/00

Abstract

A wire rod and steel wire having superior magnetic characteristics and a method for manufacturing same, wherein the wire rod and the steel wire can be used in transformers, vehicles, electric or electronic products, or the like which require low iron loss and high permeability. Provided are a wire rod and steel wire having superior magnetic characteristics and a method for manufacturing same, wherein the wire rod or the steel wire comprises, by wt %, 0.03 to 0.05% of C, 3.0 to 5.0% of Si, 0.1 to 2.0% of Mn, 0.02 to 0.08% of Al, 0.0015 to 0.0030% of N, and the remainder being Fe and unavoidable impurities. The wire rod and steel wire having directional properties may be provided by a general manufacturing process without using expensive alloying elements and without having to add a manufacturing facility.

Claims

1. A wire rod comprising, by weight, C:

0.03 to 0.05%, Si;

3.0 to 5.0%, Mn;

0.98 to 2.0%, Al;

0.02 to 0.08%, N;

0.0015 to 0.0030%, the balance;

Fe, and other unavoidable impurities,

wherein the wire rod comprises a Goss structure of not less than 2 area %.

2. The wire rod of claim 1, wherein the wire rod has a saturated magnetic flux density of not less than 180 emu.

3. A steel wire comprising, by weight, C:

0.03 to 0.05%, Si;

3.0 to 5.0%, Mn;

0.98 to 2.0%, Al;

0.02 to 0.08%, N;

0.0015 to 0.0030%, the balance;

Fe, and other unavoidable impurities,

wherein the wire comprises a Goss structure of not less than 7 area %.

4. The steel wire of claim 3, wherein the steel wire has a saturated magnetic flux density of not less than 250 emu.

5. A method for manufacturing a wire rod comprising:

heating steel comprising, by weight, C;

0.03 to 0.05%, Si;

3.0 to 5.0%, Mn;

0.98 to 2.0%, Al;

0.02 to 0.08%, N;

0.0015 to 0.0030%, the balance;

Fe, and other unavoidable impurities, at a temperature of 1000-1100°

C.;

groove-rolling the heated steel at a temperature of 900-1000°

C. at a cross-section reduction rate of 50-80%; and

cooling the groove rolled steel at a rate of 0.1°

C/s or less.

6. A method for manufacturing steel wire comprising drawing the wire rod manufactured by the method of claim 5.

7. The method of claim 6, wherein the drawing is performed at a cross-section reduction rate of 10-80%.