### 1. Steel billet
1. ** Definition ** : The billet is a semi-finished product rolled with a steel ingot. It has a relatively simple shape and is used to continue rolling steel, steel plates, wires, etc. Steel billets are not a type of steel, but a material for producing steel.
2. ** Category ** :
* In terms of appearance, it is mainly divided into three types, namely slab, square and rectangular.
+ ** Slab ** : The specifications are usually 150\~200 × 1250 × L , 180 × 1050 × L , and the scale is generally 4.5\~6 meters. Commonly used materials include general carbon blank Q235 ( Q235A , Q235B ) , low alloy billet Q345 ( Q345A , Q345B ), etc., are suitable for rolling medium-thick steel plates and hot-rolled steel plate coils.
+ ** Billet ** : The specifications are usually 120 × 120 × L , 135 × 135 × L , 150 × 150 × L , 200 × 200 × L , 250 × 250 × L , etc. The scale is generally 3\~12 Mainly meter (i.e. L=3\~12 meters), commonly used materials include general carbon billet Q235 ( Q235A , Q235B ), low alloy billet 20MnSi ( 20MnSiV ), etc., suitable for rolling hot-rolled strip steel, construction threaded steel bars, Ordinary wires, high-speed wires and various small profiles.
+ ** Rectangular blank ** : The specifications are usually 180 × 220 × L , 165 × 225 × L, etc., L=3\~12 meters, commonly used materials include general carbon blank Q235 ( Q235A , Q235B ), low alloy blank 20MnSi ( 20MnSiV ) etc., suitable for rolling hot-rolled strip steel, construction threaded steel bars, ordinary wires, high-speed wires and various small-format materials.
3. ** Purpose ** : Steel billet is one of the basic materials for manufacturing various steel materials, and is widely used in construction, machinery, automobile, ship, petrochemical and other fields.
### 2, 130 square steel billet
1. ** Specification ** : The specifications of 130 square steel billets are usually 130 × 130 × L ( L is the length and can be customized according to requirements).
2. ** Material ** : Common materials include general carbon blank Q235 ( Q235A , Q235B ) and low alloy blank. The specific material selection depends on the use environment and performance requirements.
3. ** Purpose ** :
* 130 square steel billets can be used to roll hot-rolled strip steel, construction threaded steel bars and other steel products.
* In the construction field, it can be used to manufacture building materials such as steel bars and steel plates.
* In the field of machinery, it can be used to manufacture mechanical parts such as machine tools, bearings, gears, etc.
* In addition, it can also be used in manufacturing in automobiles, ships, petrochemicals and other fields.
4. ** Production and Quality Control ** :
* The production of 130 square steel billets requires multiple processes such as steelmaking, continuous casting, and rolling.
* In the production process, it is necessary to strictly control parameters such as chemical composition, temperature, rolling force, etc. to ensure product quality.
* Quality inspection includes appearance inspection, chemical composition analysis, mechanical performance testing, etc. to ensure that the product complies with relevant standards and requirements.