GB 8491-87 Ductile Cast Iron Anti-Corrosion Parts
GB 8491-87 is a standard developed by the China State Technical Supervision strictly inspecting the quality and performance of various types of ductile cast iron anti-corrosion parts. These parts are commonly used in various commercial and residential applications due to their properties.
Ductile cast iron anti-corrosion parts are made using a ferrous material that is much more resistant to corrosion than regular cast iron. The parts are produced using a method known as nodular cast iron, which is a process where the molten metal is cooled very slowly. This process is thought to help strengthen the metal and inhibit the formation of cracks, crevices, and other weaknesses.
When fabricating ductile cast iron anti-corrosion parts, several processes are used. These include machining, plastic deformation, or metal alloy processes. During the machining process, the operators shape, shape, and size the parts to meet customer requirements. Plastic deformation is used to fashion the metal into the desired shape. And finally, metal alloy processes are used to allow for specific characteristics such as corrosion resistance, hardness, and tensile strength.
The GB 8491-87 standard outlines the requirements for manufacturing and testing the components used in ductile cast iron anti-corrosion parts. This includes such areas as material selection, mechanical properties, tensile properties, corrosion resistance, strength, hardness, and other physical characteristics required for the part. For example, the ductile cast iron must meet certain chemical and alloy requirements, plus, it must undergo testing to ensure its metallurgical properties are suitable.
The standard also defines the processes used to create and test the parts. From a quality perspective, it is important to ensure that the parts meet tight tolerances in both dimensions and surface finish. Additionally, the standard outlines the testing requirements for various aspects such as soundness, shock resistance, fatigue strength, temperature stability, hardness, and tensile strength. In addition, the standard outlines the acceptable ranges for chemical composition, metallic structure, and grain size for the parts.
Overall, GB 8491-87 is a comprehensive standard for the production and testing of ductile cast iron anti-corrosion parts. It outlines the necessary processes and requirements in order to ensure high-quality construction, performance, and durability of the parts.
