EN-GJS-500-7 ductile iron

EN-GJS-500-7 Ductile Iron Introduction:
EN-GJS-500-7 ductile iron is a kind of high strength cast iron material developed in the 1950s, its comprehensive performance is close to steel, it is based on its excellent performance, has been successfully used to cast some complex forces, strength, toughness, wear resistance requirements of high parts. Nodular cast iron is obtained by spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the ductility and toughness, so as to obtain higher strength than carbon steel. Ductile iron has rapidly developed into a cast iron material second only to gray iron and widely used. The so-called "iron instead of steel" mainly refers to ductile iron.
Chemical composition of EN-GJS-500-7 ductile iron:
C:3.40~3.85%
Silicon: 2.30~3.10%
Manganese Mn: 0.10~0.30%
Sulfur S:<0.02%
P:<0.10%
Mg:<0.07%
EN-GJS-500-7 ductile iron characteristics and scope of application:
Ductile iron has high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shock, high or low temperature resistance, corrosion resistance and dimensional stability. Widely used in the manufacture of diesel engine, automobile and tractor crankshaft, camshaft, medium pressure valve, internal combustion engine oil pump gear, steam turbine medium temperature cylinder bulkhead, hydraulic turbine valve body, railway locomotive and vehicle bearing shell, machine mount, transmission shaft, flywheel, electric frame, agricultural machinery, agricultural tools and other parts.
EN-GJS-500-7 Ductile iron mechanical properties:
Tensile strength ob(MPa):>500
Conditional yield strength c0.2(MPa):>320
Elongation δ(%):>7
Hardness :170~230HBS
EN-GJS-500-7 Heat treatment specification and metallographic structure of ductile iron:
1, annealing: get ferrite matrix, improve plasticity, toughness, stress elimination, improve cutting performance.
2, normalizing: get pearlite matrix, improve strength and resistance. 3, tempering: obtain the matrix structure of tempered sostenite, and good comprehensive mechanical properties, such as spindle, crankshaft, connecting rod, etc. 4, isothermal quenching: make the complex shape and comprehensive performance requirements of high parts to obtain the matrix structure of bainite, as well as high strength, high hardness, high toughness and other comprehensive mechanical properties, to avoid cracking during heat treatment, such as spindle, crankshaft, gear, etc. 5. Metallographic organization; Ferrite + pearlite.