What grade is ductile iron?
The grades of ductile iron are as follows: Grade 60-40-18. Grade 65-45-12.
What GJS 400?
EN-GJS-400 ductile iron, also called as nodular iron, is a very good and common cast iron. It has good tensile strength and yield strength, and the largest elongation compared with other ductile iron grades. Moreover, it has the best impact property, casting and machining functions.
What iron has high ductility?
Ductile iron—also referred to as spheroidal or nodular iron—is actually a group of irons that exhibit high strength, flexibility, durability, and elasticity due to their unique microstructure. Cast ductile iron normally contains over 3 percent carbon; it can be bent, twisted, or deformed without fracturing.
What is en GJS?
EN-GJS-500-7 is an SG iron grade containing graphite nodules or spheres, Spheroidal Graphite. The rounded graphite nodules produces a more ductile cast iron that inhibits the formation of cracks. SG iron such as EN-GJS-500-7 has a greater fatigue and impact resistance compared to grey iron.
Which is better cast iron or ductile iron?
Ductile iron has excellent corrosion resistance, tensile strength, and yield strength. Unlike cast iron, ductile iron does not break when it is bent, so it is more suited for high demand applications. Ductile iron is typically more expensive than cast iron due to its more complicated chemical makeup.
Why is it called ductile iron?
In ductile irons, graphite is in the form of nodules rather than flakes as in grey iron. Whereas sharp graphite flakes create stress concentration points within the metal matrix, rounded nodules inhibit the creation of cracks, thus providing the enhanced ductility that gives the alloy its name.
How do you make cast iron ductile?
Ductile iron casting refers to a process in which magnesium / cerium (as an alloy of magnesium / cerium) is added to cast iron. It reacts with the sulfur and oxygen in the molten iron and changes the way the graphite is formed.
What is meant by SG iron?
Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis.
How strong is ductile iron?
Ductile iron castings are very strong compared to regular cast iron (gray iron). The tensile strength of cast iron is 20,000 – 60,000 psi while ductile iron starts at 60,000 psi and can go to 120,000 psi.
What makes ductile iron ductile?
Ductile iron pipes are normally cast by centrifugally spinning molten iron in high quality steel moulds; fittings are cast in static moulds. The iron contains small quantities of magnesium to transform the lamellar form of carbon into a spheroidal form, thereby increasing tensile strength and ductility.
What is gjl250?
Grey Iron EN-GJL-250, or grey cast iron, is a type of cast iron that has a graphite microstructure. It is named after the grey colour of the fracture it forms, which is due to the presence of graphite. It is the most common cast iron and the most widely used cast material based on weight.
Is ductile iron more expensive than cast iron?
Ductile iron has excellent corrosion resistance, tensile strength, and yield strength. Ductile iron is typically more expensive than cast iron due to its more complicated chemical makeup.
What is the difference between grade 60-40-18 and grade 80-60-03 ductile iron?
As for the grade 60-40-18, if it got large pressure load higher than 400 Mpa, it will be bent, but not broken suddenly, as for the grade 80-60-03, it can bear high pressure load up to 600 Mpa, but if the pressure load higher than 600 Mpa, it will be broken suddenly. 4. Some important issues for choosing ductile iron material grades !!!
What is the grade of 400 SG iron?
Grade 400 SG iron can be supplied in two material variations EN-GJS-400-18 and EN-GJS-400-15 (formerly BS 2789 grade 400-18, and grade 400-15). The final number in the grade refers to the percentage elongation.
What is the hardness of ductile iron castings?
However, normally, the ductile iron castings made by this grade will be in the hardness range of 149-187 Brinell hardness. Lower may mean that the material grade has not reached to this grade, and higher hardness may cause the difficulty and low speed of machining.
What is the difference between ductile iron and nodular iron?
Ductile iron has much more impact and fatigue resistance, due to its nodular graphite inclusions. Presence of graphite in spheroidal form, explains why this part of the group of materials is known as nodular cast iron or spherodial graphite iron, too.
