EN-GJL-250
Grey cast iron for housings and machine beds: Rm 250 MPa minimum on the test piece, less in thick walls; brittle, damps vibration.
Flake graphite makes it easy to cast and machine, damps vibration and carries compression well, but it breaks without warning in tension. The number is the minimum tensile strength of a separately cast test piece; the strength in a casting falls as its wall gets thicker.
- Tensile strength Rm
- ≥ 250 MPa1guaranteed minimum
- 155–250 MPa—guaranteed range · in castings, depending on wall thickness
- Elongation after fracture A
- 0.3–0.8 %—guaranteed range
How we know these values · 3 values from 2 sources
- Single source
- 1
- Trade sources only
- 2
- Click any value under “All values” to see the sources that state it, with dates.
- 2 of 3 values (composition limits included) rest only on trade sources or none: a lead, not a reference.
- How we rate evidence
What to watch
- Not yet sourced: EN 1561 tensile strength by relevant wall thickness (mandatory and guideline values); Hardness, E-modulus (it varies with stress for grey iron), density, thermal values.
All values
- Identity and composition not yet
- Mechanical 3
- Physical not yet
- Thermal not yet
- Chemical and durability not yet
Mechanical
Strength
Tensile strength Rm
Ultimate tensile strength. Product standards give a range or a minimum.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 250MPa | Single source | |
| 155–250MPa | Trade sources only |
Ductility
Elongation after fracture A
Minimum elongation; depends on gauge length and test direction.
| Condition | Value | Evidence |
|---|---|---|
| 0.3–0.8% | Trade sources only |
Compare side by side
With any other gradeSources here are public pages that reproduce EN 1561. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.