Introduction
QT500-14 is a spheroidal graphite iron casting grade covered by GB/T 1348. Typical applications include structural castings, equipment supports and wind-power components.
| Field | Value |
|---|---|
| Designation | QT500-14 |
| Material Type | Cast Iron |
| Sub Type | Ductile Cast Iron |
| Product Form | casting |
Manufacturing Process
Sand Casting
Shell Molding Casting
Lost Foam Casting
Equivalent Materials
| Standard | Material Grade |
|---|---|
| ISO 1083 | ISO1083/JS/500-14 |
| EN 1563 | EN-GJS-500-14 |
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| GB/T 1348 | Spheroidal graphite iron castings | 2019 | QT500-14 | — |
Related Casting Products
Physical Properties
| Property | Value / Unit | Note | Source |
|---|---|---|---|
| Elastic Modulus | 170 GPa | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Poisson Ratio | 0.28–0.29 | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
| Density | 7 kg/dm³ | measured at room temperature unless otherwise stated, not an acceptance limit | GB/T 1348 |
Chemical Composition
Notes
GB/T 1348 · Edition 2019
[1] All properties in this column: Typical; Recommended approximate silicon content, not a specified composition limit or acceptance criterion (6.1). Silicon may be reduced for other alloying additions or thick sections; carbon should decrease as silicon increases. Excessive silicon can reduce impact toughness. Sampling and analysis procedures are important.
[2] Si: Typical — reference only, not standard limits
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 3 — Normative
| Property | 30 < t ≤ 60 mm | t ≤ 30 mm |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 390 MPa | ≥ 400 MPa |
| Tensile Strength | ≥ 480 MPa | ≥ 500 MPa |
| Elongation | ≥ 12 % | ≥ 14 % |
Common specimen condition: Separately cast, cast-on or side-by-side cast sample
Full original column conditions
- 30 < t ≤ 60 mm — Separately cast, cast-on or side-by-side cast sample · 30 < t ≤ 60 mm
- t ≤ 30 mm — Separately cast, cast-on or side-by-side cast sample · t ≤ 30 mm
- L0 = 5d; GB/T 228.1; Minimum prescribed value
- Separately cast, cast-on or side-by-side cast sample · 30 < t ≤ 60 mm: wall thickness ≤ 60 mm
- Separately cast, cast-on or side-by-side cast sample · t ≤ 30 mm: wall thickness ≤ 30 mm
GB/T 1348 — 2019 · Table C.2 — Informative
| Property | 30 < t ≤ 60 mm | t ≤ 30 mm |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 390 MPa | ≥ 400 MPa |
| Tensile Strength | ≥ 460 MPa | ≥ 480 MPa |
| Elongation | ≥ 10 % | ≥ 12 % |
Full original column conditions
- 30 < t ≤ 60 mm — Specimen cut from the casting · supplier guideline, subject to agreement · 30 < t ≤ 60 mm
- t ≤ 30 mm — Specimen cut from the casting · supplier guideline, subject to agreement · t ≤ 30 mm
- source designation QT500-14/C; L0 = 5d; GB/T 228.1; Informative minimum guideline, not an unconditional acceptance requirement; Informative reference value; not an acceptance requirement
- Specimen cut from the casting · supplier guideline, subject to agreement · 30 < t ≤ 60 mm: wall thickness ≤ 60 mm
- Specimen cut from the casting · supplier guideline, subject to agreement · t ≤ 30 mm: wall thickness ≤ 30 mm
GB/T 1348 — 2019 · Table G.2 — Informative
| Property | t ≤ 30 mm |
|---|---|
| Tensile Strength | 500 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 | 150 MPa[1] | — / Not specified |
| Notched Rotating Bending Fatigue Ratio | 0.30[2] | — / Not specified |
| Reversed Tension Compression Fatigue Strength | — / Not specified | 200 MPa[3] |
| Reversed Tension Compression Fatigue Ratio | — / Not specified | 0.40[2] |
| Pulsating Tension Fatigue Strength | — / Not specified | 280 MPa[4] |
| Reversed Torsional Fatigue Strength | — / Not specified | 180 MPa[5] |
| Reversed Torsional Fatigue Ratio | — / Not specified | 0.36[2] |
| Rotating Bending Fatigue Strength | — / Not specified | 225 MPa[6] |
| Rotating Bending Fatigue Ratio | — / Not specified | 0.45[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
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 QT500-14 is used for structural castings, equipment supports and wind-power components. Published industrial work describes QT500-14 wind-turbine bases, while related studies discuss the use of this material series for large cast structures. Geometry, casting soundness and the operating load remain important to component selection.
The published wind-power examples do not establish a universal temperature rating or low-temperature impact qualification for every grade in the series.
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