What is EN-GJS-400C ductile iron used for?

EN-GJS-400C (EN-GJS-400-15) ferritic ductile iron is used for pressure-tight hydraulic bodies, valve and pump housings, pipe fittings, wheel hubs and shock-loaded components where ductility and impact toughness are required.

How is ductile iron different from grey cast iron?

In ductile (SG) iron the graphite forms spheroidal nodules instead of flakes. This removes the internal stress-raisers found in grey iron, giving much higher tensile strength, useful elongation and impact toughness while keeping good machinability.

Can EN-GJS-400C be welded?

Yes, within limits. Ductile iron welds better than grey iron but still requires nickel-based electrodes and, for critical work, pre-heating and slow cooling to avoid a brittle heat-affected zone.

PS QA 013 — Ductile Cast Iron Bar DUCTILE (SG) IRON BAR — FERRITIC GRADE

EN-GJS-400C

EN-GJS-400-15 / EN-JS1030

Ductile / SG / Nodular Iron Bar

Ferritic spheroidal-graphite (ductile / SG) cast iron bar, continuously cast to a dense, pressure-tight section. The graphite is present as spheroidal nodules rather than flakes, giving ductile iron its high tensile strength, ductility and impact toughness while retaining good machinability. EN-GJS-400C is the ferritic ductile grade — specified where elongation, shock loading and leak-tightness matter.

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Bar-end colour code

ORANGE

PS QA 013

Specifications & Equivalents

Grade Designations.

BS EN 1563:2018	EN-GJS-400-15 / EN-JS1030
BS 2789:1985 (withdrawn)	400/15 (SNG 400/15)
ASTM A536	60-40-18
DIN (former)	GGG-40 / 0.7040
JIS	FCD400

Stock Range

Availability & Supply Condition.

Continuously cast rounds: 25–400mm diameter. Cut lengths available from stock.

Supply condition: Continuously cast and supplied as-cast, turned or centreless ground to close diameter tolerance. Predominantly ferritic matrix.

Cut to length from 1 piece — −0/+2mm standard tolerance — 2–3 day turnaround — Cutting service details ›

Chemical Composition

Chemical Analysis.

Typical values shown as percentages by weight (% wt). Values are ranges unless stated as maxima.

Element	Typical Range (%)	Notes
Carbon (total)	3.40–3.90	Spheroidal graphite nodules
Silicon (Si)	2.20–2.90	Promotes ferritic matrix
Manganese (Mn)	0.10–0.40
Phosphorus (P)	0.05 max
Magnesium (Mg)	0.03–0.06	Nodularising agent (residual)

For full chemical analysis with cast number, request an EN 10204 3.1 material test certificate when ordering. Certificate types explained ›

Mechanical Properties

Mechanical Properties.

Indicative values to BS EN 1563. Properties vary by section size and matrix condition.

Designation	Tensile Strength (N/mm²)	0.2% Proof Stress (N/mm²)	Elongation A (%)	Hardness (HB)
EN-GJS-400C / EN-JS1030	≥400 (min)	≥250	≥15	130–180

Hardness values: see our hardness conversion table to convert between HRC, HB, HV and tensile strength.

Applications

Typical Applications.

Hydraulic and pneumatic manifolds
Pressure-tight valve and pump bodies
Pipe fittings and flanges
Machine bases and brackets
Wheel hubs and axle components
Shock-loaded general engineering components

Benefits

Key Benefits.

High ductility and impact toughness for a cast iron
Pressure-tight — ideal for hydraulic bodies
Good machinability from nodular graphite
Better shock resistance than grey iron
Castable to complex, dense sections

Technical Notes

Remarks & Guidance.

Ductile (SG) iron tolerates tensile and impact loading far better than grey cast iron because the spheroidal graphite does not act as an internal crack initiator. EN-GJS-400C is the most ductile of the standard grades, with a predominantly ferritic matrix. Weldable with nickel electrodes and pre-heat where essential. Properties quoted are for the as-cast condition and vary with section size.