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). |
| 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 |
| 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 |
