Introduction
QT450-10 is a spheroidal graphite iron casting grade covered by GB/T 1348. Typical applications include transmission housings, hubs, brackets and hydraulic components.
| Field | Value |
|---|---|
| Designation | QT450-10 |
| Material Type | Cast Iron |
| Sub Type | Ductile Cast Iron |
| Product Form | casting |
Manufacturing Process
Sand Casting
Shell Molding Casting
Lost Foam Casting
Equivalent Materials
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| GB/T 1348 | Spheroidal graphite iron castings | 2019 | QT450-10 | — |
Related Casting Products
Physical Properties
| Property | Value / Unit | Note | Source |
|---|---|---|---|
| Elastic Modulus | 169 GPa | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Poisson Ratio | 0.275 | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Thermal Conductivity | 36.2 W/(m·K) | Test at 300 °C; measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Specific Heat | 515 J/(kg·K) | measured at room temperature unless otherwise stated, not an acceptance limit; Temperature range: 20–500 °C | GB/T 1348 |
| Thermal Expansion | 12.5 ×10⁻⁶/K | measured at room temperature unless otherwise stated, not an acceptance limit; Temperature range: 20–400 °C | GB/T 1348 |
| Density | 7.1 kg/dm³ | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Maximum Magnetic Permeability | 2136 µH/m | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Hysteresis Loss | 600 J/m3 | measured at room temperature unless otherwise stated, not an acceptance limit; B = 1 T | GB/T 1348 |
| Electrical Resistivity | 0.5 µΩ·m | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
Chemical Composition
No specified chemical composition limits in GB/T 1348
Heat Treatment
GB/T 1348–2019
Heat treatment may be required under agreed delivery or retesting conditions. No grade-specific heat-treatment temperature or holding schedule is prescribed.
Mechanical Properties
Core Mechanical Properties
Conditions are not identical. Compare each stated condition and applicability separately.
GB/T 1348 — 2019 · Table 1 — Normative
| Property | t ≤ 30 mm |
|---|---|
| Yield Strength (Rp0.2) | ≥ 310 MPa |
| Tensile Strength | ≥ 450 MPa |
| Elongation | ≥ 10 % |
Common specimen condition: Separately cast, cast-on or side-by-side cast sample
Full original column conditions
- t ≤ 30 mm — Separately cast, cast-on or side-by-side cast sample · t ≤ 30 mm
- wall thickness ≤ 30 mm; L0 = 5d; GB/T 228.1; Minimum prescribed value
GB/T 1348 — 2019 · Table C.1 — Informative
| Property | t ≤ 30 mm |
|---|---|
| Yield Strength (Rp0.2) | ≥ 300 MPa |
| Tensile Strength | ≥ 440 MPa |
| Elongation | ≥ 8 % |
Full original column conditions
- t ≤ 30 mm — Specimen cut from the casting · t ≤ 30 mm
- source designation QT450-10/C; sampling position and acceptance properties subject to agreement; wall thickness ≤ 30 mm; L0 = 5d; GB/T 228.1; Informative minimum guideline, not an unconditional acceptance requirement; Informative reference value; not an acceptance requirement
GB/T 1348 — 2019 · Table G.1 — Informative
| Property | Value |
|---|---|
| Shear Strength | 405 MPa |
| Compressive Strength | 700 MPa |
- Annex G informative reference data; measured at room temperature unless otherwise stated, not an acceptance limit; Informative reference value; not an acceptance requirement
GB/T 1348 — 2019 · Table G.2 — Informative
| Property | t ≤ 30 mm |
|---|---|
| Tensile Strength | 450 MPa |
Full original column conditions
- t ≤ 30 mm — Specimen cut from casting · diameter ≤25 mm · t ≤ 30 mm
- wall thickness ≤ 30 mm; Informative guideline; stress-controlled fatigue; N = 10^7 cycles, failure probability P = 50% for fatigue data; not an acceptance requirement; Informative reference value
Additional Mechanical Properties
Fatigue Properties
Conditions are not identical. Compare each stated condition and applicability separately.
GB/T 1348 — 2019 · Table G.2 — Informative
| Property | Test window 1 | Test window 2 |
|---|---|---|
| Notched Rotating Bending Fatigue Strength | 139 MPa[1] | — / Not specified |
| Notched Rotating Bending Fatigue Ratio | 0.31[2] | — / Not specified |
| Reversed Tension Compression Fatigue Strength | — / Not specified | 185 MPa[3] |
| Reversed Tension Compression Fatigue Ratio | — / Not specified | 0.41[2] |
| Pulsating Tension Fatigue Strength | — / Not specified | 259 MPa[4] |
| Reversed Torsional Fatigue Strength | — / Not specified | 166 MPa[5] |
| Reversed Torsional Fatigue Ratio | — / Not specified | 0.37[2] |
| Rotating Bending Fatigue Strength | — / Not specified | 207 MPa[6] |
| Rotating Bending Fatigue Ratio | — / Not specified | 0.46[2] |
- diameter ≤25 mm; relevant wall thickness t ≤30 mm; t ≤ 30 mm; wall thickness ≤ 30 mm; Informative guidance, not an acceptance requirement; The source cycle-count wording is inconsistent; N = 10^7 cycles (10 million), P = 50% reference: ISO 1083:2018 Table G.2 footnotes b/c; Supplemental reference; not an official GB corrigendum; Stress-controlled fatigue according to Wöhler; Informative reference value; not an acceptance requirement
- Test window 1: Notched specimen, Kt ≤3 machined from a sample cut from casting
- Test window 2: Unnotched specimen machined from a sample cut from casting
Fracture Toughness
GB/T 1348 — 2019 · Table G.1 — Informative
| Property | Value |
|---|---|
| Fracture Toughness (KIC) | 28 MPa√m |
- Annex G informative reference data; measured at room temperature unless otherwise stated, not an acceptance limit; Informative reference value; not an acceptance requirement
Other Mechanical Properties
GB/T 1348 — 2019 · Table G.1 — Informative
| Property | Value |
|---|---|
| Torsional Strength | 405 MPa |
- Annex G informative reference data; measured at room temperature unless otherwise stated, not an acceptance limit; Informative reference value; not an acceptance requirement
Notes
GB/T 1348 · Edition 2019
[1] Notched Rotating Bending Fatigue Strength: R = -1; approximately 21.8%; Kt ≤ 3; σbwk(R=-1)/Rm ≈ 0.40 - 0.0002 × Rm; Mean source-strength, not a guaranteed limit
[2] Notched Rotating Bending Fatigue Ratio/Reversed Tension Compression Fatigue Ratio/Reversed Torsional Fatigue Ratio/Rotating Bending Fatigue Ratio: Source-not a calculated value
[3] Reversed Tension Compression Fatigue Strength: R = -1; approximately 22.3%; σw/Rm ≈ 0.50 - 0.0002 × Rm; Mean source-strength, not a guaranteed limit
[4] Pulsating Tension Fatigue Strength: R = 0; σmax = 2σ; approximately 9%; σ(R=0)/σ(R=-1) ≈ 0.7; Mean source-strength, not a guaranteed limit
[5] Reversed Torsional Fatigue Strength: R = -1; approximately 14%; τw/Rm ≈ 0.46 - 0.0002 × Rm; Mean source-strength, not a guaranteed limit
[6] Rotating Bending Fatigue Strength: R = -1; approximately 14.2%; σw/Rm ≈ 0.55 - 0.0002 × Rm; Mean source-strength, not a guaranteed limit
Welding Conditions
N/A
Applications
Ductile iron GB/T 1348 Grade QT450-10 is used for transmission housings, hubs, brackets and hydraulic components. They are used in vehicle assemblies, agricultural equipment and industrial machinery where a cast shape accommodates mounting points, bores or internal passages. The required balance of strength and ductility depends on the part and its loading.
These are family-level applications, and individual components still require selection against their design and inspection requirements.
Need QT450-10 Castings?
Contact us for casting and machining inquiries.
Email Us for a QuoteLast Updated: November 6, 2026