QT450-10 full ferritic ductile iron features uniform spherical graphite matrix, outstanding ductility and stable sub-zero impact resistance, available as-cast or annealed for general & low-temperature industrial castings.
QT450-10 is a mature fully ferritic spheroidal graphite ductile iron formulated under national standard GB/T 1348-2019. Its internal microstructure consists of evenly distributed spherical graphite nodules embedded in pure ferrite matrix, delivering perfect balance of tensile strength, ultra-high ductility and reliable low-temperature impact resistance without cold brittleness.
We supply two production grades to satisfy different working scenarios: as-cast high-toughness QT450-10 without heat treatment for sub-zero environments, and conventional annealed QT450-10 for general ambient temperature machinery with lower production cost.
Compared with pearlite ductile iron like QT600-3, QT450-10 owns far better plasticity and vibration damping performance. It can withstand repeated alternating impact loads, widely cast into auto chassis, hydraulic valve bodies, pipeline flanges and cold-area mechanical structural parts.
QT450-10 stands out among common nodular iron grades with comprehensive balanced performance:
Strict control of impurity elements S/P, residual magnesium and rare earth to guarantee complete graphite spheroidization:
| Element | Content Range |
|---|---|
| C (Carbon) | 3.5 ~ 3.9 |
| Si (Silicon) | 2.2 ~ 2.9 |
| Mn (Manganese) | ≤ 0.60 |
| S (Sulfur) | ≤ 0.025 |
| P (Phosphorus) | ≤ 0.045 |
| Residual Mg | 0.03 ~ 0.06 |
| RE Rare Earth | 0.015 ~ 0.04 |
Composition Control Notes: Carbon-silicon equivalent is adjusted to eliminate cementite; S/P limited to avoid grain boundary brittleness; Mg & RE act as nodulizing agents to form full spherical graphite.
| Performance Item | Minimum Standard Value |
|---|---|
| Tensile Strength (Rm) | ≥ 450 MPa |
| Yield Strength (Rp0.2) | ≥ 310 MPa |
| Elongation Rate (A) | ≥ 10% |
| Brinell Hardness (HBW) | 160 ~ 210 |
| Metallographic Matrix | 100% Fully Ferritic |
| Physical Item | Parameter Value |
|---|---|
| Graphite Spheroidization Grade | ≥ Grade 3 |
| Graphite Size Grade | Grade 5 ~ 7 | Density | 7.20 ~ 7.30 g/cm³ |
| Modulus of Elasticity | 162 GPa |
| Linear Expansion Coefficient (20~400℃) | 11.8 ×10⁻⁶ /℃ |
| Thermal Conductivity | 36 ~ 42 W/(m·K) |
| Low Temperature Stable Impact Range | -40℃ ~ Room Temp |
| Industry Field | Common Cast Parts |
|---|---|
| Automotive Industry | Axle housing, suspension bracket, brake caliper, wheel hub, exhaust flange |
| Hydraulic Machinery | Hydraulic valve body, pump housing, cylinder block, bearing seat |
| Pipeline & Valve | Low temp valve body, ductile flange, water pump casing |
| Mining & Construction | Light crusher support, conveyor roller base |
| Agricultural Machinery | Tractor chassis, harvesting machine connecting castings |
QT450-10 is prioritized for equipment requiring ductility and low-temperature impact resistance:
| Material Grade | Matrix Type | Elongation | Low Temp Toughness | Core Usage |
|---|---|---|---|---|
| QT400-18 | Full Ferrite | 18% | Excellent | Ultra-low temperature heavy impact |
| QT450-10 | Full Ferrite | 10% | Good | General cold & alternating load parts |
| QT500-7 | Ferrite-Pearlite | 7% | Medium | General machinery structural castings |
| QT600-3 | Pearlite Main | 3% | Poor | High strength wear parts |
Selection Guide: Choose QT450-10 when you need balanced cost, ductility and -40℃ low temperature performance.
QT450-10 soft ferrite matrix brings easy machining, but standard operation is required to avoid hidden defects:
Cutting, drilling and tapping can be completed with common carbide tools with high efficiency. Avoid rapid thermal shock during machining to prevent surface microcracks.
For welding repair: Preheat castings to 200~300℃ before welding, slow furnace cooling after welding to eliminate welding stress and cold cracks.
During equipment assembly, avoid violent hammer striking; reserve deformation allowance for parts bearing alternating load to utilize its high ductility characteristic.
The alloy formula is optimized for medium low-temperature industrial working conditions:
Controlled low manganese content prevents brittle grain boundary segregation; matched magnesium & rare earth additives realize complete spherical graphite nodulization without flake graphite defects.
Two production processes are designed for differentiated demand: as-cast grade cuts annealing cost for cold area projects; annealed grade reduces raw material cost for normal temperature mass production.
Uniform soft ferrite matrix balances mechanical strength and machining performance, lowering total manufacturing cost of finished castings.
We provide full OEM customized QT450-10 cast parts based on customer drawings and working parameters:
Select as-cast high-toughness or annealed general grade as required; customize wall thickness, flange size, special-shaped structural castings, valve bodies and brackets.
Support one-stop service including mold opening, casting, heat treatment, CNC precision machining and surface painting. Provide complete material test certificates for project bidding.
QT450 ductile iron castings adopt anti-collision export packaging to avoid surface scratch and crack damage during long-distance transit:
Small precision valve parts and brackets are packed with foam inside solid wooden cases. Large automotive and pipeline castings are bundled with steel belts and covered with protective plastic film.
Support FOB/CIF/CFR international trade terms, sea, land and air shipping options. Furnish complete GB/T 1348 test reports and material certificates for customs clearance.
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