Steel Production Technology And Equipment

1. Blast furnace-converter rolling process

Blast furnace-converter rolling process is also known as long flow process, its main process is: iron ore - sintering - blast furnace iron making - converter steelmaking - refining - continuous casting - heating - rolling - finishing. At present, the iron and steel industry in our country mainly adopts the long flow production technology, and the crude steel output accounts for about 90% of the total output in our country.

2. Electric furnace - rolling process

Electric furnace-rolling process is also called short process. The process is: scrap - electric furnace steelmaking - refining - continuous casting - heating - rolling - finishing. At present the special steel enterprises of our country mainly adopt short flow technology.

3. Rebar production technology and equipment

Rebar production equipment continuous bar mill, the billet used is generally continuous casting billet, its side length is generally 130-160mm, the length is generally about 6-12 meters. Most rolling lines are arranged alternately flat and vertical to achieve full line rolling without torsion. According to different billet specifications and finished product sizes, there are 18, 20, 22, 24 bar mills, among which 18 are the mainstream. At present, bar rolling using step type heating furnace, high pressure water desolating, low temperature rolling, headless rolling and other new technology, rough rolling, rolling to adapt to large billet and improve the direction of rolling accuracy, finishing mill is mainly to improve the accuracy and speed, rebar product specifications are generally ф10-40mm. The technological process is as follows:

Step heating furnace → roughing mill → middle mill → finishing mill → water cooling device → cold bed → cold shear → automatic counting device → bundling machine → unloading bench.

4. High speed wire production technology and equipment

High-speed wire mill usually refers to the mill with a maximum speed higher than 40m/s, and the maximum speed of newly built high-speed wire mill can reach 120m/s. The main process characteristics of high-speed wire can be summarized as: continuous, high speed, torsion-free and controlled cooling, among which high speed rolling is the main process characteristics. High speed wire mill is characterized by large plate weight, high precision and excellent performance. Its production process is as follows:

Step heating furnace → blanking → cutting head → rough rolling → medium rolling → pre-finishing rolling → finishing rolling → water cooling → spinning cloth ring → loose winding air cooling → collecting winding → rolling and hanging winding → bundling packaging → marking → weighing → storage.

5. Hot rolled coil production technology and equipment

The production process of hot rolled coil mainly includes three kinds: conventional hot continuous rolling, thin slab continuous casting continuous rolling and furnace coiling mill.

The advantages of conventional hot continuous rolling are stable process, high production efficiency, thick slab, high product quality, mainly positioning high quality and more complete varieties, such as super deep drawing steel, high strength steel, high steel grade pipeline steel, automobile plate, etc.

The advantages of thin slab continuous casting and rolling are less investment, saving land, low energy consumption, low cost, can produce thinner products and other characteristics, mainly positioning middle and low grade, thin products.

With less investment and flexible production, the steckel mill can produce both hot rolled coil and medium thickness plate.