Resin Sand Casting of Ductile Iron

Single-source supply of resin sand (no-bake) ductile iron castings to EN 1563 / GB/T 1348, from pattern to fully machined and tested component. Managed production with foundry partners in China, delivered to your door in the UK or Europe.

What we supply

Bruynseels Ltd supplies ductile (spheroidal graphite) iron castings produced in furan resin-bonded sand moulds (the no-bake process). It is the process of choice for medium and heavy castings in small to medium batch quantities: pump and valve bodies, gearbox and bearing housings, brackets and general machinery castings for the agricultural, off-highway, energy and general engineering sectors.

We handle the complete supply chain: pattern manufacture, casting, heat treatment, NDT, precision CNC machining, surface protection and delivery. One purchase order, one point of contact.

Why resin sand for ductile iron

Ductile iron behaves differently from steel or aluminium during solidification: graphite precipitation causes the iron to expand inside the mould. A rigid mould turns that expansion into an advantage: the casting feeds itself, porosity is reduced, and feeder requirements shrink. Chemically bonded resin sand produces exactly that rigid, dimensionally stable mould, which soft green sand moulds cannot match on heavier sections.

The practical benefits for buyers:

• Soundness in heavy sections. Rigid moulds suppress mould wall movement, giving denser castings with less shrinkage porosity, which is critical for pressure-retaining and highly stressed parts.
• Dimensional accuracy. Typically ISO 8062-3 DCTG 9–11, better than green sand, reducing machining stock and cost.
• Surface finish. Fine, coated resin sand gives a clean as-cast surface with sharp detail and legible cast-on markings.
• Tooling economics. No-bake moulding works from wood, resin or aluminium patterns, giving low tooling cost and fast lead time for prototypes and batch quantities from one-offs to several thousand per year.
• Weight range. From a few kilograms up to around 1 tonne, in section thicknesses green sand cannot reliably produce.

Grades to EN 1563 / GB/T 1348

Grade (EN 1563)	GB/T 1348 equivalent	Character	Typical use
EN-GJS-400-15	QT400-15	Ferritic, high ductility	Safety-critical, off-highway, general engineering
EN-GJS-500-7	QT500-7	Ferritic-pearlitic	Pump and valve bodies, brackets
EN-GJS-600-3 (formerly BS 2789 600/3)	QT600-3	Pearlitic, wear-resistant	Gears, sheaves, rollers

Other grades, including EN-GJS-450-10 (QT450-10), EN-GJS-700-2 (QT700-2) and the low-temperature EN-GJS-400-18-LT (QT400-18L), can be quoted on request. Grey (flake graphite) iron castings to EN 1561 (EN-GJL-200, 250 and 300; GB/T 9439 HT200, HT250 and HT300) are produced on the same lines.

Quality and testing

Every order is produced against an agreed specification and inspection plan. Depending on the criticality of the part, we offer:

• Material test reports with chemical analysis and mechanical test results
• Visual inspection; ultrasonic and magnetic particle examination arranged through accredited test houses where the specification requires it
• Dimensional reports, first article inspection and marked-up casting drawings
• Pressure testing of machined pressure-retaining components

The foundry is certified to GB/T 19001-2016 / ISO 9001:2015. Melting is in temperature-controlled electric furnaces, with furnace-front carbon-silicon thermal analysis and spectrometer verification of every heat. Nodularity and matrix structure are confirmed by metallographic examination, and mechanical properties by tensile and hardness testing in the foundry's own laboratory.

From casting to finished part

Most customers buy finished components, not raw castings. Our CNC machining capability covers turning, milling and boring to tight tolerances, with in-process gauging and final CMM inspection. Air-tightness testing and dynamic balancing of impellers and other rotating parts are available for pump components. Painting, blasting and other surface treatments are applied to your specification, and parts arrive packed, certified and ready for assembly.