National standard QT400-15 wear-resistant ductile iron rod

National wear-resistant ductile iron rod material grade standard/ductile iron parts
National and regional steel group ductile iron standards do not have specific requirements for chemical composition, as long as the mechanical properties are guaranteed.
Yield strength
Tensile strength
Elongation
Cast iron can be divided into
① Gray cast iron. It has a high carbon content (~carbon mainly exists in the form of flake graphite, and the fracture surface is gray, referred to as gray iron. It has a low melting point (~℃) and small shrinkage when solidified. Its compressive strength and hardness are close to carbon steel, and it has good shock absorption. Used to manufacture machine tool beds, cylinder boxes and other structural parts.
② White cast iron. The carbon silicon content is low, the carbon mainly exists in the form of cementite, and the fracture surface is silvery white. It shrinks greatly during solidification and is prone to shrinkage. Hole cracks. High hardness, high brittleness, cannot withstand impact loads. Mostly used as blanks of malleable cast iron and to make wear-resistant parts.
③ Malleable cast iron. Obtained from white cast iron after annealing, graphite is in the form of floccules Distribution, referred to as tough iron. Its structural properties are uniform, wear-resistant, and has good plasticity and toughness. It is used to manufacture parts with complex shapes that can withstand strong dynamic loads.
④ Ductile iron. The gray cast iron molten iron is passed through the ball Obtained after chemical treatment, the precipitated graphite is spherical, referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron. It is used to manufacture internal combustion engine automobile parts and agricultural machinery and tools.
⑤ Vermicular graphite cast iron . It is obtained by vermigating gray cast iron molten iron, and the precipitated graphite is in the shape of worms. The mechanical properties are similar to that of ductile iron, and the casting performance is between gray cast iron and ductile iron. It is used to manufacture automobile parts.
⑥Alloy cast iron. Ordinary cast iron is obtained by adding an appropriate amount of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.). The alloying elements change the matrix structure of the cast iron, thus having corresponding heat resistance, wear resistance, corrosion resistance, etc. Low temperature or non-magnetic properties. Used in the manufacture of parts for mining chemical machinery and instrumentation.
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