Necessity analysis of cast iron weight verification
2023-06-05
Under normal circumstances, we often encounter customers who require third-party proof when placing orders for cast iron weights. At this time, weight manufacturers often tell customers that they need to charge higher testing fees. Many people don't quite understand this. Isn't the third-party certificate the certificate for cast iron weights? Why increase costs?
According to the manufacturer of the weights, if third-party testing of cast iron or stainless steel weights is required, the weights need to be sent to the national metrological verification department for testing, and the professional metrological department will issue a weight verification report. Because third-party certificates are tested by third-party testing institutions, customers need to bear the cost of testing certificates.
The third-party inspection certificate for cast iron weights is expensive, usually exceeding the price of the weight itself. The higher the weight grade, the higher the inspection cost. For customers who do not require a certificate, the manufacturer of cast iron weights suggests that you do not need to undergo third-party testing. In general, the weight manufacturer will carry a quality certificate of the weight when leaving the factory. Only qualified cast iron weights from the manufacturer will be delivered to customers, and you can use them with confidence.
Wholesale of cast iron weights
Additionally, it should be noted that there are quite a few weights to be tested that have been sent to the national professional metrology and testing department, and it will take a long time for them to issue certificates. For customers who urgently need cast iron weights, it is recommended to prepare in advance.
Grey cast iron. The carbon content is high (2.7%~4.0%), and the carbon mainly exists in the form of flake graphite, with a gray fracture surface, abbreviated as gray iron. Low melting point (1145-1250), low solidification shrinkage, compressive strength and hardness similar to carbon steel, and good shock absorption. Used for structural components such as machine bed, cylinder, box, etc.
White cast iron. Low carbon and silicon content, mainly composed of carburized cast iron
The body shape exists, and the fracture surface is silver white. During solidification, there is a large amount of shrinkage, which can easily lead to shrinkage cavities and cracks. It has high hardness and brittleness, and cannot withstand impact loads. Used as malleable cast iron blanks and wear-resistant parts.
Malleable cast iron. White cast iron is annealed and has a flocculent distribution of graphite, abbreviated as ductile iron. It has uniform structure and properties, wear resistance, good plasticity and toughness. Used for parts with complex shapes and large dynamic loads.
Spherical graphite cast iron. Grey cast iron is obtained through the spheroidization treatment of molten iron, and the precipitated graphite is spherical, abbreviated as nodular cast iron. Compared with ordinary gray cast iron, it has higher strength, better toughness, and plasticity. Used for internal combustion engines, automotive parts, and agricultural machinery.
Vermicular graphite cast iron. Grey cast iron is obtained by vermiculizing molten iron, and the precipitated graphite is vermicular. The mechanical properties are similar to those of ductile iron, and the casting performance is between gray iron and ductile iron. Used for automotive components.
Alloy cast iron. Ordinary cast iron is obtained by adding appropriate alloying elements such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc Alloying elements alter the matrix structure of cast iron, giving it corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance, or no magnetism. Used for parts such as mining, chemical machinery, and instruments.
That's the end of this article's explanation. We will see you next time for more exciting content. Thank you for your support and trust in us!
According to the manufacturer of the weights, if third-party testing of cast iron or stainless steel weights is required, the weights need to be sent to the national metrological verification department for testing, and the professional metrological department will issue a weight verification report. Because third-party certificates are tested by third-party testing institutions, customers need to bear the cost of testing certificates.
The third-party inspection certificate for cast iron weights is expensive, usually exceeding the price of the weight itself. The higher the weight grade, the higher the inspection cost. For customers who do not require a certificate, the manufacturer of cast iron weights suggests that you do not need to undergo third-party testing. In general, the weight manufacturer will carry a quality certificate of the weight when leaving the factory. Only qualified cast iron weights from the manufacturer will be delivered to customers, and you can use them with confidence.
Wholesale of cast iron weights
Additionally, it should be noted that there are quite a few weights to be tested that have been sent to the national professional metrology and testing department, and it will take a long time for them to issue certificates. For customers who urgently need cast iron weights, it is recommended to prepare in advance.
Grey cast iron. The carbon content is high (2.7%~4.0%), and the carbon mainly exists in the form of flake graphite, with a gray fracture surface, abbreviated as gray iron. Low melting point (1145-1250), low solidification shrinkage, compressive strength and hardness similar to carbon steel, and good shock absorption. Used for structural components such as machine bed, cylinder, box, etc.
White cast iron. Low carbon and silicon content, mainly composed of carburized cast iron
The body shape exists, and the fracture surface is silver white. During solidification, there is a large amount of shrinkage, which can easily lead to shrinkage cavities and cracks. It has high hardness and brittleness, and cannot withstand impact loads. Used as malleable cast iron blanks and wear-resistant parts.
Malleable cast iron. White cast iron is annealed and has a flocculent distribution of graphite, abbreviated as ductile iron. It has uniform structure and properties, wear resistance, good plasticity and toughness. Used for parts with complex shapes and large dynamic loads.
Spherical graphite cast iron. Grey cast iron is obtained through the spheroidization treatment of molten iron, and the precipitated graphite is spherical, abbreviated as nodular cast iron. Compared with ordinary gray cast iron, it has higher strength, better toughness, and plasticity. Used for internal combustion engines, automotive parts, and agricultural machinery.
Vermicular graphite cast iron. Grey cast iron is obtained by vermiculizing molten iron, and the precipitated graphite is vermicular. The mechanical properties are similar to those of ductile iron, and the casting performance is between gray iron and ductile iron. Used for automotive components.
Alloy cast iron. Ordinary cast iron is obtained by adding appropriate alloying elements such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc Alloying elements alter the matrix structure of cast iron, giving it corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance, or no magnetism. Used for parts such as mining, chemical machinery, and instruments.
That's the end of this article's explanation. We will see you next time for more exciting content. Thank you for your support and trust in us!
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