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CNC Machining of Ductile Cast Iron

CNC Machining of Ductile Cast Iron

Material: Ductile (Nodular) Cast Iron, Spheroidal Graphite Cast Iron 
Process: Shell Casting + CNC Machining
Weight: 5.50 kg
Application: Railroad Freight Car

China CNC machining of ductile cast iron (nodular cast iron, spheroidal graphite cast iron) for spare parts of railroad freight car. 3.1 material certificate is available.

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Description

CNC machining parts of ductile cast iron for railroad freight cars from RMC, who provide one stop solutions from casting, heat treatment, surface treatment to CNC machining.

CNC machining refers to the machining process proceed by Computerized Numberical Control (CNC for short). It is aided by the CNC to reach a high and steady accuracy with less labor cost. Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing, in distinction from processes of controlled material addition, which are known as additive manufacturing.


CNC Precision Machining Capabilities

Facilities Quantity Size Range (mm) Annual Capacity
Vertical Machining Center (VMC) 48 sets 1,500 × 1,000 × 800 6,000 tonn or 300,000 pieces
Horizontal Machining Center (VMC) 12 sets 1,200 × 800 × 600 2,000 tons or 100,000 pieces
CNC Machine 60 sets Max turning φ600 5,000 tons or 600,000 pieces
Standard of Tolerance: ISO 8062 2013, ISO 2768, GOST 26645 (Russia) or GBT 6414 (China).

Exactly what the “controlled” part of the definition implies can vary, but it almost always implies the use of machine tools (in addition to just power tools and hand tools). This is a process used to manufacture many metal products, but it can also be used on materials such as wood, plastic, ceramic, and composites. The CNC machining covers many different processes such as milling, turning, lathing, drilling, honing, grinding...etc.

Ductile Iron Equivalent Grades from Different Countries

No. China Japan U.S.A. ISO German France Russia гост U.K. BS
GB JIS ASTM UNS DIN W-Nr. NF
1 FCD350-22 - - 350-22 - - - Bч35 350/22
2 QT400-15 FCD400-15 - - 400-15 GGG-40 0.7040 EN-GJS-400-15 Bч40 370/17
3 QT400-18 FCD400-18 60-40-18 F32800 400-18 - - EN-GJS-400-18 - 400/18
4 QT450-10 FCD450-10 65-45-12 F33100 450-10 - - EN-GJS-450-10 Bч45 450/10
5 QT500-7 FCD500-7 80-55-6 F33800 500-7 GGG-50 0.7050 EN-GJS-500-7 Bч50 500/7
6 QT600-3 FCD600-3 ≈80-55-06 ≈100-70-03 F3300 F34800 600-3 GGG-60 0.7060 EN-GJS-600-3 Bч60 600/3
7 QT700-2 FCD700-2 100-70-03 F34800 700-2 GGG-70 0.7070 EN-GJS-700-2 Bч70 700/2
8 QT800-2 FCD800-2 120-90-02 F36200 800-2 GGG-80 0.7080 EN-GJS-800-2 Bч80 800/2
8 QT900-2 120-90-02 F36200 800-2 GGG-80 0.7080 EN-GJS-900-2 ≈Bч100 900/2

CNC Machining of Ductile Cast Iron


Mechanical Properties of Ductile (Nodular) Cast Iron

Item according to DIN EN 1563 Measure Unit EN-GJS-350-22-LT EN-GJS-400-18-LT EN-GJS-400-18 EN-GJS-500-7 EN-GJS-600-3 EN-GJS-700-2 EN-GJS-800-2
EN-JS 1015 EN-JS 1025 EN-JS 1020 EN-JS 1050 EN-JS 1060 EN-JS 1070 EN-JS 1080
Tensile Strength Rm min.MPA 350 400 400 500 600 700 800
2% Yield Strength Rp0.2 min.MPA 220 240 250 320 370 420 2) 480 2)
Elongation A % 22,0 18,0 18,0 7,0 3,0 2,0 2,0
Hardness HB 110-150 120-160 140-190 170-220 200-250 230-280 250-330
Structures mainly ferritic mainly ferritic mainly ferritic ferritic + pearlite ferritic + pearlite mainly pearlite all pearlite
Shear Stress σaB MPa 315 360 360 450 540 630 720
Torsion TtB MPa 315 360 360 450 540 630 720
Modules of elasticity E GPa 170 170 170 175 175 175 175
Poisson number v – 0,280 0,280 0,280 0,280 0,280 0,280 0,280
Compressive Strength σdB MPa – 700 700 800 870 1000 1150
Frature Toughness Klc MPa ·√m 31 30 30 25 20 15 14
Density g/cm3 7,1 7,1 7,1 7,1 7,2 7,2 7,2


CNC Precision Machining Parts