Introduction
Class 250 is a gray cast iron grade covered by ASTM A278/A278M. Typical applications include pressure-containing gray iron castings for service up to 450 F (230 C).
| Field | Value |
|---|---|
| Designation | Class 250 |
| Material Type | Cast Iron |
| Sub Type | Grey 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 |
|---|---|---|---|---|
| ASTM A278/A278M | Standard Specification for Gray Iron Castings for Pressure-Containing Parts for Temperatures Up to 650 F (350 C) | 01 | Class 250 | — |
Related Casting Products
Physical Properties
N/A
Chemical Composition
No specified chemical composition limits in ASTM A278/A278M
Heat Treatment
ASTM A278/A278M–01
N/A
Mechanical Properties
Core Mechanical Properties
ASTM A278/A278M — 01 · Table 4 — Normative
| Property | Value |
|---|---|
| Tensile Strength | ≥ 250 MPa |
- Separately cast test bar A, B, C or S selected for controlling section per Tables 1 and 5; Pressure-containing parts; up to 450 F / 230 C; unit systems as separately printed, not converted grades; Test bars shall represent the same lot. If heat treated, bars and castings are treated in the same furnace. Bar dimensions follow Table 1; purchaser selects bar via Table 5, otherwise manufacturer selects. The standard gives separate inch-pound and SI class tables; no identity equivalence is inferred between classes.
Welding Conditions
N/A
Applications
Grey cast iron ASTM A278/A278M Class 250 is used for pressure-containing gray iron castings for service up to 450 F (230 C). Other cast components used in this material family include pump bodies, valve bodies, covers, flanges and fittings. Typical settings include water, heating and industrial piping systems.
Finished-component pressure, temperature and fluid limits remain separate from the material grade and its standard-specific restrictions.
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