High magnetic induction oriented silicon steel and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10236105-B2
Application number	US-201214422991-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Aug 30, 2012
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

The invention relates to high magnetic induction oriented silicon steel and a preparation method thereof. The oriented silicon steel comprises the following chemical elements by weight percent: 0.035-0.120% of C, 2.9-4.5% of Si, 0.05-0.20% of Mn, 0.005-0.050% of P, 0.005-0.012% of S, 0.015-0.035% of Als, 0.001-0.010% of N, 0.05-0.30% of Cr, 0.005-0.090% of Sn, not more than 0.0100% of V, not more than 0.0100% of Ti, at least one of trace elements of Sb, Bi, Nb and Mo, and the balance of Fe and other inevitable impurities, wherein Sb+Bi+Nb+Mo is 0.0015-0.0250% and (Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9) ranges from 0.1 to 15.

First claim

The invention claimed is:

1. A manufacturing method of a magnetic induction oriented silicon steel, comprising the following operations conducted in sequence:
smelting and casting to obtain a slab;
hot-rolling;
normalizing and annealing;
cold-rolling to obtain a steel plate;
calculating decarbonizing temperature coefficients a and b using a linear fitting method based at least in part on a measurement of a primary grain size Φ and a measurement of a primary recrystallization degree P of a test steel after decarbonizing annealing the test steel;
decarbonizing annealing, wherein the decarbonizing temperature satisfies the formula T (x 1 , x 2 )=a x 1 +bx 2 +c, wherein x 1 is the content of Sb+Bi+Nb+Mo with a unit being ppm, x 2 is the mole fraction ratio of (Sb+Bi+Nb+Mo)/(V+Ti), a ranges from 0.1to 1.0, b ranges from 0.1 to 1.0 and c ranges from 800 to 900° C.; and the decarbonizing time period is 80-160s;
performing nitriding treatment;
coating the steel plate with MgO and then performing annealing at 1200° C.; and
applying an insulating coating and performing hot stretching, flattening annealing so as to obtain the magnetic induction oriented silicon steel;
wherein the magnetic induction oriented silicon steel, comprising the following chemical elements by weight percent:
0.035-0.120% of C,
2.9-4.5% of Si,
0.05-0.20% of Mn,
0.005-0.012% of S,
0.015-0.035% of acid-soluble Al,
0.001-0.010% of N,
0.05-0.30% of Cr,
0.005-0.090% of Sn,
not more than 0.0100% of V,
not more than 0.0100% of Ti,
at least one of trace elements Sb, Bi, Nb and Mo, and
the balance being Fe and inevitable impurities;
wherein Sb+Bi+Nb+Mo is 0.0015-0.0250% and the value of (Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9) ranges from 0.1 to 15;
wherein the magnetic induction oriented silicon steel has a magnetic induction B 8 of more than 1.93T.

2. The manufacturing method of the magnetic induction oriented silicon steel according to claim 1 , wherein the decarbonizing temperature is controlled such that Φ is not more than 30 μm and P is not less than 90%.

3. The manufacturing method of the magnetic induction oriented silicon steel according to claim 1 , further comprises an operation of refining a magnetic domain.

4. The manufacturing method of the magnetic induction oriented silicon steel according to claim 1 , wherein in the operation of hot-rolling, a heating temperature is not more than 1250° C.

5. The manufacturing method of the magnetic induction oriented silicon steel according to claim 1 , wherein in the operation of cold-rolling, a cold rolling reduction ratio is not less than 75%.

6. The manufacturing method of the magnetic induction oriented silicon steel according to claim 1 , wherein in the operation of performing nitriding treatment, a content of infiltrated nitrogen is 50-260 ppm.

Assignees

• Baoshan Iron & Steel

Inventors

• Zhang Huabing
• Li Guobao
• Lu Xijiang
• Yang Yongjie
• Hu Zhuochao
• Shen Kanyi
• Gao Jiaqiang
• Wu Meihong

Classifications

• C22C38/04

  containing manganese · CPC title

• C21D6/005

  containing Mn · CPC title

• C22C38/24

  with vanadium · CPC title

• C22C38/26

  with niobium or tantalum · CPC title

• C21D8/1222

  Hot rolling · CPC title