Gray Iron Casting for OEM Components in China
YBMETAL supplies OEM-grade Gray Iron Castings for industrial, agricultural, and transportation applications. As a full-process iron casting supplier in China with in-house CNC machining, we provide custom gray iron components that meet global quality and dimensional standards. Our gray iron foundries adhere to ISO 9001/IATF 16949 systems and deliver castings that are fully machined and documented for traceability.
What Is Gray Cast Iron? Grades, Properties & Standards
Gray cast iron is a type of cast iron characterized by its flake graphite microstructure, which gives the fractured surface a gray appearance. It is the most commonly used cast iron due to its excellent machinability, vibration-damping, and wear resistance. YBMETAL supports global grades, including:
- HT200 / HT250 / HT300 (China GB 9439)
- ASTM A48 Class 30 / 35 / 40 (USA)
- EN-GJL-200 / 250 / 300 (EU)
- FC200 / FC250 (Japan)
International Gray Cast Iron Standards Comparison by Country and Grade
| Country | Standard | Equivalent Grades of Grey Iron (Gray Cast Iron) | ||||||
| ISO | ISO 185 | 100 | 150 | 200 | 250 | 300 | 350 | – |
| China | GB 9439 | HT100 | HT150 | HT200 | HT250 | HT300 | HT350 | – |
| USA | ASTM A48 | – | NO.20 NO.25 | NO.30 | NO.35 | NO.40 NO.45 | NO.50 | NO.55 NO.60 |
| Germany Austria | DIN 1691 | GG10 | GG15 | GG20 | GG25 | GG30 | GG35 | GG40 |
| European | EN 1561 | EN-GJL-100 | EN-GJL-150 | EN-GJL-200 | EN-GJL-250 | EN-GJL-300 | EN-GJL-350 | |
| Japan | JIS G5501 | FC100 | FC150 | FC200 | FC250 | FC300 | FC350 | – |
| Italy | UNI 5007 | G10 | G15 | G20 | G25 | G30 | G35 | – |
| France | NF A32-101 | – | FGL150 | FGL200 | FGL250 | FGL300 | FGL350 | FGL400 |
| UK | BS 1452 | 100 | 150 | 200 | 250 | 300 | 350 | – |
| India | IS 210 | – | FG150 | FG200 | FG260 | FG300 | FG350 | FG400 |
| Spain | UNF | – | FG15 | FG20 | FG25 | FG30 | FG35 | – |
| Belgium | NBN 830-01 | FGG10 | FGG15 | FGG20 | FGG25 | FGG30 | FGG35 | FGG40 |
| Australia | AS 1830 | – | T150 | T220 | T260 | T300 | T350 | T400 |
| Sweden | SS 14 01 | O110 | O115 | O120 | O125 | O130 | O135 | O140 |
| Norway | NS11 100 | SJG100 | SJG150 | SJG200 | SJG250 | SJG300 | SJG350 | – |
| Min. Tensile Strength (Mpa) | 100 | 150 | 200 | 250 | 300 | 350 | – | |
Why Choose Gray Iron Castings for OEM Applications?
Sourcing iron castings from China often brings challenges: inconsistent quality, delayed lead times, unclear specs, and poor communication.
- ✅ Excellent Vibration Damping: Perfect for bases, housings, and machine structures that require damping of dynamic loads.
- ✅ Good Wear Resistance: Ideal for parts with sliding or friction surfaces like pump housings, brake drums, or bearing supports.
- ✅ Outstanding Machinability: The flake graphite allows easier cutting and better tool life in CNC operations.
- ✅ Cost-Efficient Casting Material: Lower melting temperature and good fluidity reduce production cost compared to ductile iron or cast steel.
- ✅ Dimensional Stability: High thermal conductivity and low shrinkage make it suitable for complex, dimensionally stable castings.
Limitations of Gray Iron – When It’s Not the Right Fit
- ❌ Low tensile strength and ductility: Not suitable for shock loads or dynamic mechanical stress.
- ❌ Limited pressure-tight performance: Graphite flake structure creates micro-leaks — not recommended for high-pressure applications.
- ❌ Not weldable: Difficult to repair via welding due to carbon content and brittleness.
- ❌ Unsuitable for impact-prone environments: Prone to cracking if subjected to sudden force or heavy vibration cycles.
Common Applications of Gray Iron Casting Components
- Engine blocks and flywheels
- Pump and valve housings
- Gearbox casings and motor frames
- Stove and boiler parts
- Brake rotors and manifolds
- Agricultural and industrial components
YBmetal’s Gray Iron Casting Capabilities
- Material range: HT200 to HT300 / EN-GJL-200 to 300
- Casting weight: 2 kg to 800 kg
- Molding methods: green sand, resin sand, shell molding
- In-house CNC machining: turning, milling, drilling
- Optional: heat treatment, painting, pressure testing
- Full documentation: material certs, CMM reports, PPAP, FAI
Request a Quote for CNC-Machined Gray Iron Parts
YBMETAL delivers precision gray iron components with machining and full certification for global OEMs. Whether you need prototypes or large-batch production, we support your project from design to delivery.