EN-GJS-400-15

Ferritic ductile iron: Rm 400 MPa, Rp0.2 250 MPa, elongation 15 % — castable like iron, tough like steel.

Graphite in spheres instead of flakes keeps the iron ductile. The designation states minimum tensile strength and elongation (400 MPa, 15 %). Used for pipes, valves, crankshafts and machine parts. Values fall with wall thickness.

Tensile strength Rm: ≥ 400 MPa1guaranteed minimum
0.2 % proof strength Rp0.2: ≥ 250 MPa1guaranteed minimum
Elongation after fracture A: ≥ 15 %—guaranteed minimum

How we know these values · 8 values from 2 sources

Single source: 2
Trade sources only: 6

Click any value under “All values” to see the sources that state it, with dates.
6 of 8 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 1563 values for relevant wall thickness above 30 mm; Hardness, E-modulus, density and thermal values from a foundry.

All values

Identity and composition 5
Mechanical 3
Physical not yet
Thermal not yet
Chemical and durability not yet

Mechanical

Strength

0.2 % proof strength Rp0.2

Minimum 0.2 % proof strength.

Condition	Value	Evidence
	≥ 250MPa	Single source

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 400MPa	Single source

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 15%	Trade sources only

Chemical composition

Show on the periodic table

Typical analysis of one supplier, %

Element	Applies to	Range %	Evidence
C	all thicknesses	3.4–3.6	Trade sources only
Si	all thicknesses	2.7–2.9	Trade sources only
Mn	all thicknesses	0.10	Trade sources only
P	all thicknesses	0.040	Trade sources only
S	all thicknesses	0.012	Trade sources only

EN 1563 specifies properties, not composition; these are one supplier's limits.

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With any other grade

Sources here are public pages that reproduce EN 1563. 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.