1. What is ductile iron
Before pouring the molten iron, add a small amount of nodulizing agent (such as magnesium, calcium and rare earth elements), graphite agent (such as ferrosilicon, calcium-silicon alloy) to promote the existence of carbon in the shape of spherical graphite. This cast iron is called Ductile iron.
Ductile iron greatly exceeds gray iron in strength, plasticity and toughness, and even approaches steel. In acidic media, the ductile iron has poor corrosion resistance, but in other media the corrosion resistance is better than gray cast iron. Its price is lower than steel. Because it has the advantages of ordinary cast iron and steel, it has become a new structural material. In the past, important parts made of carbon steel and alloy steel (such as crankshafts, connecting rods, main shafts, medium-pressure valves, etc.) have been converted to ductile iron. Through die-casting, precision parts can be processed without pouring, followed by high-temperature firing.
Ductile iron is a new sand-turning process, and the difference between ordinary and general is generally different in texture. It is generally used to produce manhole covers and pipe fittings. Density: similar to the density of steel.
Second, what is gray iron
Gray iron is a type of cast iron, and the internal carbon exists as flake graphite. The fracture is gray, so it is referred to as gray iron.
3. The difference and connection between ductile iron and gray iron
1. Look at the cutting surface
Gray iron: gray, dark gloss, rough surface. Ductile iron: gray, the gloss is brighter than gray iron, the surface roughness is like gray iron.
2. File test
Gray iron: The filing resistance is relatively low, and there is a "slapping" sound when filing, and the file is rarely sticky. The dust ends are gray-black with a few silver-white highlights. The size of the particles is different, and the small particles are mainly fine. Grinding with fingers can easily make fingers black. Ductile iron: The resistance is slightly larger than that of gray iron when filing, and there is also a more obvious "slapping" sound, rarely sticking to the file, the dust is gray and black, with fine bright spots, and the particle size varies, but the large particles are used Mainly, use your fingers to grind the dust, which can make your fingers black, but it is lighter than gray iron.
3. Listen to percussion
Gray iron: The sound is deep and the duration is extremely short. Ductile Iron: The sound is crisp, with aftertones, and the duration is short.
4. Gray iron is gray cast iron, corresponding to nodular cast iron. Both are a type of cast iron.
4. What is the purpose of casting pig iron
Mainly used to produce ferrous metal castings, such as gray cast iron, nodular cast iron, white cast iron, vermicular graphite cast iron, cold shock cast iron, wear-resistant cast iron, etc. Models include pig iron for ductile iron GB1412-85, cast iron for cast iron GB718-82, different types of pig iron: divided into grades by silicon content, such as Q12, pig iron for ductile iron, silicon content 1.0-1.4%, average 1.2%. Grouped by manganese content, graded by phosphorus content, and classified by sulfur content.
5. What is the difference between gray cast iron for casting and ball casting?
The production of nodular cast iron has higher requirements than gray cast iron, especially the strict control of sulfur, manganese and silicon content. The carbon in the middle exists in different shapes. The graphite form of gray iron exists in the form of flakes or cotton wool, and the graphite in ductile iron exists in the form of spheres.
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