Cast Iron Price Guide 2026: Factors, Benchmarks & Negotiation Tips
Understanding cast iron pricing isn't just about cost per kilogram. This guide breaks down the real factors that determine price—and how to negotiate better deals with Chinese foundries.
Cast Iron Price Basics
Cast iron pricing varies significantly based on multiple factors. A simple "price per kg" quote often hides important cost drivers.
Material Grade Impact
| Grade | Type | Typical Application | Price Index |
|---|---|---|---|
| HT200/HT250 | Grey Iron | Engine blocks, machine bases | 1.0x (baseline) |
| HT300/HT350 | Grey Iron (high strength) | Heavy machinery | 1.1x |
| QT400-18 | Ductile Iron | Valves, pipe fittings | 1.3x |
| QT500-7 | Ductile Iron | Gears, crankshafts | 1.4x |
| QT700-2 | Ductile Iron (high strength) | Heavy-duty components | 1.5x |
Key Price Factors
1. Material Cost (40-50% of total)
- Pig iron and scrap steel prices (track on Shanghai Steel Exchange)
- Alloying elements: Si, Mn, Cu, Ni, Mo
- Material yield: 60-75% typical (rest is gating/risers)
2. Labor & Overhead (20-30%)
- Molding method: manual vs. automatic
- Part complexity: cores, inserts, tight tolerances
- Batch size: smaller runs = higher per-part cost
3. Tooling Cost (amortized)
- Pattern: wood (cheap) vs. aluminum vs. iron
- Core boxes: number and complexity
- Typical pattern life: 5,000-50,000 pieces
4. Post-Casting Operations
- Shot blasting: standard inclusion
- Heat treatment: annealing, normalizing, quenching
- Machining: rough vs. finish machining
- Surface treatment: painting, galvanizing
2026 Price Benchmarks (China)
Indicative prices for standard cast iron parts, FOB Chinese port:
| Part Type | Weight Range | Grade | Price Range ($/kg) |
|---|---|---|---|
| Simple shapes | 1-10 kg | HT250 | $1.20 - $1.80 |
| Complex geometry | 1-10 kg | HT250 | $1.80 - $2.50 |
| Valve bodies | 5-50 kg | QT450-10 | $2.00 - $3.00 |
| Large machinery | 100-500 kg | HT300 | $1.50 - $2.20 |
| Precision parts | 0.5-5 kg | QT500-7 | $2.50 - $4.00 |
Note: Prices as of Q1 2026. Subject to raw material fluctuations.
Volume Discount Structure
- Prototype (1-10 pcs): 3-5x standard price
- Small batch (10-100 pcs): 1.5-2x standard price
- Medium volume (100-1,000 pcs): standard price
- High volume (1,000+ pcs): 10-20% discount
- Very high volume (10,000+ pcs): 15-30% discount
Negotiation Tips
- Request detailed cost breakdown — understand where your money goes
- Compare material cost to market rates — pig iron prices are public
- Negotiate tooling ownership — who owns the pattern?
- Lock in prices with contracts — protect against material price swings
- Consider total cost — shipping, duties, quality risk, not just piece price
Hidden Costs to Watch
- Rework and scrap: 5-15% typical; higher for complex parts
- Shipping weight: actual vs. quoted weight
- Payment terms: currency risk, bank fees
- Quality inspection: third-party costs
- Delays: expedited shipping, line-down costs
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