Introduction
ASTM A126 Class B is one of the standard's three gray iron casting classes for pressure-retaining valve parts, pipe fittings, and flanges. Casting process options include Sand Casting, Shell Molding Casting and Lost Foam Casting, subject to the applicable specification and component requirements.
| Field | Value |
|---|---|
| Designation | Class B |
| Material Type | Cast Iron |
| Sub Type | Grey Cast Iron |
| Product Form | casting |
Manufacturing Process
Sand Casting
Shell Molding Casting
Lost Foam Casting
Equivalent Grades
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| ASTM A126 | Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings | 04 | Class B | — |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM A126Edition 04 |
|---|---|
| P | ≤ 0.75 % |
| S | ≤ 0.15 % |
Heat Treatment
NO HEAT TREATMENT
Mechanical Properties
| Property | ASTM A126Edition 04[1] |
|---|---|
| Tensile Strength | ≥ 31 ksi |
Notes
ASTM A126 · Edition 04
[1] All properties in this column: one tension test per lot; A126 test bar unless §13.1 alternative
Welding Conditions
N/A
Applications
Typical casting applications include valve pressure-retaining parts, pipe fittings, and flanges.
Last Updated: October 13, 2026