Content
Introduction
The YB/T068-1995 is a standard for low-carbon, low-phosphorus cast iron developed by the Chinese Ministry of Industries in 1995. This standard stipulates the physical and mechanical properties of low-carbon, low-phosphorus cast iron, and is intended to be used in the metallurgical industry. This standard is also called “Tundish Grade Iron”, as it is most commonly used in the production of ladle inserts and other components for the metallurgical industry.
Chemical Composition
Low-carbon, low-phosphorus cast iron conforming to the YB/T068-1995 standard contains elements such as ferro-silicon, ferro-manganese, silicon-calcium and ferro-titanium in varying proportions. The range of possible chemical compositions as specified by this standard is detailed in Table 1.
Table 1. Chemical Composition of YB/T068-1995 Standard Cast Iron
Element Proportion
Fe (Balance) At least 95.0%
C ≤ 2.5%
Si ≤ 2.5%
Mn ≤ 0.3%
Ca ≤ 0.2%
S ≤ 0.06%
P ≤ 0.05%
Physical and Mechanical Properties
The physical and mechanical properties of low-carbon, low-phosphorus cast iron as per the YB/T068-1995 standard can vary depending on the chemical composition. However, typical values of these properties are as shown in Table 2.
Table 2. Physical and Mechanical Properties of YB/T068-1995 Standard Cast Iron
Property Value
Tensile Strength ≥ 550 MPa
Yield Strength ≥ 420 MPa
Elongation ≥ 15%
Impact Toughness ≥ 12 J
Brinell Hardness 100-200 HB
Conclusion
The YB/T068-1995 standard for low-carbon, low-phosphorus cast iron is an important standard for the Chinese metallurgical industry, as it provides specifications for the chemical composition and desired physical and mechanical properties of the products. This standard enables manufacturers to ensure that all components and ladle inserts manufactured from low-carbon, low-phosphorus cast iron meet the desired quality criteria.
