Introduction
In recent years, stainless steel bars have become increasingly popular due to their unique properties that make them ideal materials for a range of applications.GB 1200-92 is a standard used to set quality and safety standards for stainless steel bars and determines the requirements for chemical composition, mechanical properties, finish and sizes to ensure that the bars meet the necessary requirements.This standard is used within the Chinese metric system and applies to stainless steel bars in the form of bars, rods, shapes, tubes, forgings, wire and sheet products.
Chemical Composition
The chemical composition of a stainless steel bar according to GB 1200-92 is defined as follows: Carbon 0.08% max, Silicon 0.75% max, Manganese 2.00% max, Phosphrous 0.040% max, Sulphur 0.030% max, Chromium 16.00-18.00%, Nickel 10.00-14.00%. The elemental contents in these ranges are based on an approximate analysis of the chemical composition. The actual composition may vary from the prescribed ranges depending upon the specific application and condition of the stainless steel bar.
Mechanical Properties
The mechanical properties of stainless steel bars are based on the material’s strength and ductility.These include Tensile Strength, Yield Strength,Elongation, Ductility and Hardness. The mechanical properties according to GB 1200-92 are as follows: Tensile Strength ≥ 590MPa, Yield Strength ≥ 310MPa, Elongation ≥ 30%, Hardness ≤ 240HB. These mechanical properties must meet or exceed the specified requirements to be considered compliant with the standard.
Finish
The finish of a stainless steel bar is an important factor in determining its overall quality and performance. GB 1200-92 states that the finish of stainless steel bars must be free of any surface imperfections, free from defects, and possess a uniform bright polished finish.
Size
The size of a stainless steel bar according to GB 1200-92 is dependent on the application for which it is intended. The sizes may range from Φ6mm to Φ150mm and can be customized to the specific application.
Conclusion
In conclusion, GB 1200-92 is a standard used to set quality and safety standards for stainless steel bars and determines the required elements for chemical composition, mechanical properties, finish and sizes. The standard is used within the Chinese metric system and applies to stainless steel bars in the form of bars, rods, shapes, tubes, forgings, wire and sheet products. As stainless steel bars are increasingly used in a range of applications, it is essential to ensure all bars comply with the prescribed requirements to guarantee optimal performance.
