Baoshan Iron & Steel Co., Ltd.

Yunpeng Xu

Yongjie Yang

Yaming Ji

Xiao Ling Chen

Jie Huang

Guobao Li

Zipeng Zhao

Guohua Yang

Huande Sun

Changguo Huang

Dengfeng Li

Lingyun Chen

Xiao Chen

The present invention refers to a chromium-free insulation coating material for non-oriented silicon steel, comprising, in parts by weight, the following components: metal dihydrogen phosphate salt of 100 parts, epoxy resin of 10&#x2dc;60 parts, naphthenate drier or isooctanoate metal salt drier of 0.001&#x2dc;10 parts, organic solvent of 0.001&#x2dc;100 parts and pure water of 60&#x2dc;2000 parts. The metal dihydrogen phosphate salt is Al(HPO), Mg(HPO), Ca(HPO)or Zn(HPO); the epoxy resin is water-soluble epoxy resin or epoxy resin emulsion. Chromium-free insulation coating material of the present invention, after being coated on non-oriented silicon steel, renders highly transparent appearance, and has excellent insulativity, corrosion resistance, adhesiveness, weldability and manufacturability, so as to eliminate defects of the existing chromium-free coating, such as sticky and un-wear-resistant and to meet environment protection requirements.

Chromium-free insulation coating material for non-oriented silicon steel

A method of manufacturing oriented Si steel containing Cu with high electric-magnetic property comprises: hot rolling slab; after first cold rolling, heating it to 800&#xb0; C. or higher temperature and performing intermediate decarburization annealing in a protective atmosphere with P/Pof 0.50&#x2dc;0.88 for 3-8 minutes, to decrease carbon content of the steel plate to less than 30 ppm; then peening and acid-pickling to remove oxide of Fe on surface and to control oxygen content to lower than 500 ppm; secondary cold rolling to final thickness and coating separation agent in water-slurry form; drying to decrease water content to lower than 1.5%; high-temperature annealing in a protective atmosphere containing hydrogen with oxidation degree (P/P) of 0.0001-0.2; finally applying a tension coating and leveling tension annealing.

Method for producing grain-oriented silicon steel containing copper

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Shanghai, China

Yunpeng Xu