Introduction
QT-HBW230 is a spheroidal graphite iron casting grade covered by GB/T 1348. Typical applications include machined housings, hubs, gear blanks and general engineering castings.
| Field | Value |
|---|---|
| Designation | QT-HBW230 |
| Material Type | Cast Iron |
| Sub Type | Ductile Cast Iron |
| Product Form | casting |
Manufacturing Process
Sand Casting
Shell Molding Casting
Lost Foam Casting
Equivalent Materials
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| GB/T 1348 | Spheroidal graphite iron castings | 2019 | QT-HBW230 | — |
Related Casting Products
Physical Properties
N/A
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
GB/T 1348 — 2019 · Table E.1 — Informative
| Property | Test window 1 |
|---|---|
| Brinell Hardness | 190–270 HBW[1] |
| Tensile Strength | ≥ 600 MPa[2] |
| Yield Strength (Rp0.2) | ≥ 370 MPa[2] |
- Test bar or agreed position on casting; manufacturer selects a representative casting position in the absence of agreement; Annex E applies only by agreement. Tensile/proof strength values are reference data when hardness is the inspection characteristic. QT-HBW300 and QT-HBW330 are not applicable to thick-walled castings. Hardness testing frequency and number are agreed; E.3 procedure applies when hardness and tensile properties are both specified.; Informative reference value; not an acceptance requirement
Notes
GB/T 1348 · Edition 2019
[1] Brinell Hardness: GB/T 231.1
[2] Tensile Strength/Yield Strength (Rp0.2): Reference only
Welding Conditions
N/A
Applications
Ductile iron GB/T 1348 Grade QT-HBW230 is used for machined housings, hubs, gear blanks and general engineering castings. This designation is selected by its specified hardness requirements rather than by assuming a particular tensile grade. The intended component must therefore be checked against the agreed hardness range and any additional mechanical requirements.
Family-level examples do not establish a grade-specific pressure, impact or fatigue rating.
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Email Us for a QuoteLast Updated: November 6, 2026