Ductile cast / gray iron castings / Hebei River casting supply Botou River casting Heavy Machinery Co., Ltd. is a professional production of iron castings, steel castings, ductile iron, ingot mold manufacturers. Strength of the company, a professional production and processing plant, to meet different customer product requirements. Production equipment, testing equipment! Ductile iron castings, mobility and linear shrinkage and gray cast iron the same shrinkage and tendency to form large internal stress than gray cast iron, easy to produce shrinkage and cracking, strength elastic modulus greater than the plastic gray cast iron, good abrasion resistance, vibration absorption poor than gray cast iron. Ductile iron castings structure is in the form of a volume of coagulation, and eutectic graphite is surrounded by austenite eutectic forms to grow volume eutectic adjacent tends to grow their centers From crowded very open, so empty during the expansion, thus feeding poorly, resulting in shrinkage tendency dispersed large elastic modulus ductile than gray cast iron is high, a large residual stress. Stress is often coupled with a decrease in toughness make it a lot, so uneven wall thickness of ductile iron castings easy to crack gray iron castings mobility, mention shrinkage and linear shrinkage is small, notch sensitivity, low mechanical properties, compression 3-4 times higher than the tensile strength of vibration absorption is good, about 10 times larger than the steel, a low modulus of elasticity. Gray cast iron structure is the thickness of gray cast iron is not easy to be too thin to be properly thickened corners to prevent white tissue, where both are difficult to process hard and brittle, the mechanical properties of gray cast iron wall thickness sensitivity extremely significant, it is not easy by increasing the thickness of the ways to improve the bearing capacity of the casting, but by using a reasonable cross-section shape to achieve that aim to eliminate the thick section and improve the bearing capacity of gray cast iron is almost no plastic, not after deformation were like steel castings, as corrected, so far as possible the principle of simultaneous coagulation and symmetrical structure in the design of gray iron castings, the contraction of the structure can be freely structured and designed to prevent the casting wall thickness deformation and cracks. Quality than similar products of the same quality than the price the same price than service the same service than speed. Provide design drawings manufacturing test-proofing products to provide customers with free technical advice