Iron Casting Manufacturer in India

Esteem Auto casts the full grey iron range from ISO 185 grade 100 through 350 (ASTM A48 No.20 to No.60, IS 210 FG150 to FG400) and ductile SG iron from ISO 1083 400-15 through 900-2 (ASTM A536 60-40-18 to 120-90-02, IS 1865 SG370/17 to SG800/2). Grade is selected to match the strength, hardness and elongation your part requires.

Yes. Castings are produced to whichever national standard your drawing specifies, with equivalence mapped across 15 standards including ISO, ASTM, DIN, EN, JIS, BS, IS, GB, UNI, NF, AS, SS and NS. Buyers can quote a grade in their own standard and receive a matching casting, which removes the conversion step from overseas enquiries.

Yes, all three describe the same material. Spheroidal graphite (SG) iron, ductile iron and nodular graphite iron are regional names for cast iron in which magnesium treatment forms the graphite into spheres rather than flakes, giving far higher tensile strength and elongation than grey iron. Esteem Auto uses the terms interchangeably across standards.

They state the minimum mechanical properties in order: 60,000 psi tensile strength, 40,000 psi yield strength and 18 percent elongation. So 60-40-18 is a softer, more ductile grade, while 100-70-03 gives 100,000 psi tensile with only 3 percent elongation. Choosing between them is a trade-off between strength and ductility.

The class number is the minimum tensile strength in thousands of psi. ASTM A48 Class 30 means a minimum of 30,000 psi, Class 40 means 40,000 psi, and so on up to Class 60. Higher classes are stronger and harder but slightly less machinable, so the class is chosen against the loads and machining the part will see.

DIN 1693 GGG 40 corresponds to EN-GJS-400-15 under EN 1563, ASTM A536 60-40-18, BS 2789 grade 420/12 and IS 1865 SG400/12. Esteem Auto's grade tables map grey and ductile iron equivalents across ISO, ASTM, DIN, EN, JIS, BS, IS and other standards so buyers can confirm the match before ordering.

EN-GJS-500-7 to EN 1563:2011 provides 500 MPa minimum tensile strength, 320 MPa yield strength, 7 percent elongation and a hardness of roughly 170-230 HB. It is one of the most widely specified general-purpose ductile grades, balancing strength and ductility for machinery, automotive and hydraulic components.

Match the grade to the loading. EN-GJS-400-18 offers 400 MPa tensile with 18 percent elongation and 130-175 HB, suiting parts that must absorb shock or impact. EN-GJS-700-2 gives 700 MPa and 225-305 HB but only 2 percent elongation, suiting high-load wear parts. Higher strength always costs ductility and machinability.

Nodularity measures how spherical the graphite particles are within the iron. High nodularity gives the strength, ductility and fatigue resistance expected of SG iron, while poor nodularity leaves flake-like graphite that behaves closer to grey iron. It is assessed on a metallurgical microscope, which is why microstructure is checked alongside chemical composition.

Cast iron has a higher carbon content, typically two to four percent, which forms free graphite. That gives excellent castability, vibration damping and machinability but lower ductility. Cast steel holds carbon below roughly two percent with no free graphite, giving higher toughness and weldability at greater cost. Esteem Auto casts both, so selection is driven by the application.

Chemical composition is confirmed on a spectrometer, graphite structure and nodularity are examined on a metallurgical microscope, and hardness and tensile properties are checked on hardness testers and a computerised universal testing machine. This confirms the casting genuinely meets the specified grade rather than only matching it dimensionally.

Yes, on request. Because chemical composition is verified by spectrometer and mechanical properties on a computerised universal testing machine in-house, test data can be reported against the specified grade with the consignment. This is commonly required by OEM procurement and for export documentation, and works alongside our IATF 16949 and ISO 9001 systems.