Universal non-oriented electrical steel A series

Product Description

    Cold Rolled Strip is a production process when processing steel, using cold extrusion method (without heating, on the contrary, it is called hot rolling). Cold-rolled strips and sheets generally have a thickness of 0.1 to 3 mm and a width of 100 to 2000 mm; both are made of hot-rolled strips or steel plates, and are rolled into products by cold rolling mills at room temperature.

Process Flow

1.Pickling

    The iron oxide scale on the surface of the hot-rolled coil is removed with a continuous pickling line. In the past, sulfuric acid was used for acid solution, and hydrochloric acid was often used. Before pickling, it is welded and rolled, and some are continuously "black annealed". After pickling, it is cleaned, dried, trimmed, and rolled.

2.Cold rolling

    The pickled strip is rolled to the finished thickness on a cold rolling mill, generally without intermediate annealing. The total compression ratio of five-stand continuous rolling mill is generally 60-80%, and the main rolling thickness is 0.3-3mm automotive sheet, enamel sheet and galvanized sheet.

    The six-stand continuous rolling mill mainly rolls tin-plated sheets with a thickness of 0.15 to 0.5 mm, and the total cold rolling reduction rate is generally 70 to 90%. The distribution of the reduction amount of each stand (or pass) during rolling is comprehensively formulated according to the allowable pressure, power and speed of the rolling mill, taking into account factors such as output and quality.

3.Process lubrication

    From lubricating and cooling. Generally, emulsions with good cooling properties are used, and pure oil lubricants with good lubricating properties are used when rolling thin or hard metals, such as palm oil for rolling tin-plated sheets or stainless steel.

4.Annealing

    The purpose is to eliminate cold rolling work hardening, make the steel plate recrystallized and softened, and have good plasticity. The annealing methods are bell-type furnace coil annealing and continuous furnace annealing. Coil annealing is divided into tight coil annealing and loose coil annealing; continuous furnace annealing is divided into vertical continuous furnace annealing and horizontal continuous furnace annealing.

    Generally, protective gas is introduced into the furnace. Most of them are annealed in a bell-type furnace. Although the treatment cycle is long, due to a large number of furnaces, the use is flexible and the investment is saved. Continuous furnace annealing has a large output, of which horizontal continuous furnace annealing is only used to process special steels with low output, such as decarburization annealing of silicon steel.

5.Flatten

    The purpose is to avoid plastic instability of the annealed steel sheet during stamping and to improve the quality (flatness and surface condition) of the steel sheet.

    There are two types of skin-passing mills, single-stand reversible and double-stand, with a skin-passing compression rate of 0.5 to 4%. The double-stand skin pass mill has high efficiency and high compression rate, and can be used for secondary cold rolling at the same time to further roll thin steel plates; if combined with a five-stand continuous rolling mill, it can produce 0.10-0.15mm coils.

6.Plating, cutting and packaging

    The steel sheet that needs to be coated is sent to the galvanized, tin-plated or organic coating unit for processing.

    Generally, the cold-rolled sheet is cut after flattening. There are longitudinal shearing and transverse shearing. The longitudinal shearing is to cut the edges or slits according to the required width, and the transverse shearing is to cut the coil into a single sheet according to the required length.

    The cut finished strips, after inspection and classification, are coated with anti-rust oil to pack and leave the factory.

JFY Shanghai Industries Corporation is located in Baoshan District, Shanghai. It specializes in cold-rolled grain-oriented electrical steel and cold-rolled non-oriented electrical steel. It is a leading electrical steel trade service provider in China, integrating electrical steel trade, electrical steel processing, and electrical steel stamping. Deep processing, logistics and distribution, warehousing supervision as one.

The company acts as an agent for the main domestic electrical steel manufacturers Baowu Steel, Shagang, Taigang, Shougang, Xingang, Maanshan Iron and Steel to produce cold-rolled grain-oriented electrical steel and non-oriented electrical steel. The sales volume is 600,000 tons, the annual sales amount exceeds 4 billion yuan, and the company's standing inventory is not less than 30,000 tons.

The company's customers come from various domestic provinces and export to the United States, Mexico, the European Union, India, Thailand, Vietnam and other countries. The main customers cover well-known manufacturers in various industries, such as Siemens, Samsung, LG, Midea, Haier in the home appliance industry; ABB, Regeb Electric in the United States; BYD in the new energy industry; Jiangsu Dongcheng Company in the power tool industry, etc., look forward to establishing business contacts with new and old customers at home and abroad.