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Iron Castings
Kormax supplies custom cast iron castings in gray (grey), ductile and white iron to engineers and procurement teams for the USA, Australia and New Zealand, sourced through a network of qualified foundries. Send us the drawing: we’ll recommend the grade and process, then manage tooling, casting, machining and inspection through to delivery.
Gray, Ductile and White Iron Castings to ASTM, ISO and AS Standards
We work across the five iron families engineers specify: gray iron for machinability and damping, ductile (nodular or SG) iron for strength and toughness, abrasion-resistant white iron for wear, heat-resistant gray iron for elevated-temperature service, and austenitic ductile iron for corrosive service. Specify to ASTM, ISO or Australian Standards.
Gray ironDuctile / SG ironWhite iron & Ni-HardHeat-resistant ironAustenitic ductile iron
This list isn’t exhaustive. For other iron grades, or grades specified to ISO or AS standards, contact the Kormax team.
Iron Grades We Cast
| Family | Standards | ASTM Grades | What The Grade Name Tells You | Typically Chosen For |
|---|---|---|---|---|
| Gray iron | ASTM A48 · ISO 185 · AS 1830 | Class 20, 25, 30, 35, 40 | ASTM: class = minimum tensile in ksi. Class 30 = 30 ksi (207 MPa). ISO and AS grades are named in MPa, e.g. grade 250 | Machine bases, housings, pump and valve bodies, counterweights |
| Ductile iron | ASTM A536 · ISO 1083 · AS 1831 | 60-40-18, 65-45-12, 70-50-05, 80-55-06, 100-70-03 | ASTM: tensile–yield–elongation. 65-45-12 = 65 ksi (448 MPa), 45 ksi (310 MPa), 12%. ISO and AS: tensile in MPa and elongation, e.g. 400-15 | Hubs, gear housings, brackets, valve bodies |
| White iron | ASTM A532 · ISO 21988 · AS 2027 | Ni-Hard, Chromium 12, Chromium 25 | Specified by hardness and composition, not tensile strength | Mill liners, slurry pipe bends and wearback corners, crusher and chute wear parts |
| Heat-resistant iron | ASTM A319 | A319 | Gray iron for non-pressure parts in elevated-temperature service | Furnace and kiln parts, grate bars, burner components |
| Austenitic ductile iron | ASTM A439 · ISO 2892 · AS 1833 | D2 (58-30-8) | 58 ksi (400 MPa), 30 ksi (207 MPa), 8% | Pump bowls, impellers, valve parts in corrosive or hot service |
Need gray or ductile iron castings? Send us your drawing.Request a Quote
Iron Sand Casting, Investment Casting and Machining
Sand casting
The usual route for gray and ductile iron. Flexible designs, lower setup cost, and large or heavy-section parts.
Investment casting
Intricate geometry, fine as-cast finish and tight tolerances on smaller iron parts.
Casting machining
Castings machined to your drawing and delivered ready for assembly.
Also available: Centrifugal casting (AU and NZ) · Continuous casting (AU and NZ)
Need cast iron bar rather than castings? Gray and ductile iron bar, cut to size (New Zealand)
What We Cast, and Who For
01
Pumps, Valves & Fluid Power
Pump casings, valve bodies, hydraulic manifolds and cylinder end caps in gray iron ASTM A48 Class 30 and 35 and ductile iron A536 65-45-12, machined to your drawing.
02
Water & Wastewater Equipment
Pump volutes, flanged fittings, valve bodies and screen components for treatment-equipment manufacturers, in ductile iron A536 65-45-12 and gray iron A48 Class 30.
03
Mining, Quarrying & Aggregate
Mill liners, slurry pipe bends and wearback corners, crusher and chute wear parts in Ni-Hard and high-chromium white iron to ASTM A532 or AS 2027, where abrasion resistance sets service life.
04
Off-Highway, Construction & Agriculture
Wheel hubs, axle and gear housings, brackets and counterweights in ductile iron A536 65-45-12 and 80-55-06, sand cast for section size and weight.
05
Oil, Gas & Power Generation
Pump bowls, impellers, compressor housings and valve parts in austenitic ductile iron ASTM A439 D2, for corrosive and elevated-temperature service.
06
Machine Shops & Industrial OEMs
Machine bases, gearbox housings, pulleys and bearing housings in gray iron A48 Class 30 and 40, supplied as castings or machined and ready to assemble.
FAQs About Iron Castings
Gray iron machines easily and damps vibration, so it suits machine bases, housings and pump bodies. Ductile iron is stronger and tougher and tolerates shock loads, so it suits hubs, brackets and pressure-containing parts. If you’re unsure, send us the drawing and the service conditions and we’ll recommend a grade.
Both are abrasion-resistant white irons to ASTM A532. Ni-Hard is a nickel-chromium iron (Class I), where nickel gives a hard matrix around the carbides. High-chromium irons (Classes II and III) form harder chromium carbides and generally resist abrasion better, with some added corrosion resistance. The right choice depends on the type of wear, the impact load and the section size, and our metallurgists will recommend one.
Yes. Gray iron can be specified to ISO 185 or AS 1830, ductile iron to ISO 1083 or AS 1831, abrasion-resistant white iron to ISO 21988 or AS 2027, and austenitic ductile iron to ISO 2892 or AS 1833. Give us the standard and grade on your drawing and we’ll confirm the match before quoting.
Sand casting is the usual route for gray and ductile iron, from small parts to large, heavy sections. Investment casting suits smaller parts with intricate geometry or a fine as-cast finish. In Australia and New Zealand, centrifugal casting suits cylindrical parts such as liners and bushes, and continuous casting produces bar. Send your drawing and we’ll recommend the process.
Yes. We coordinate machining and finishing so castings arrive ready to assemble, and agree machining allowances with you at the design stage.
Yes. Inspection requirements, material certification and documentation are agreed in writing before production begins, so you receive the records your quality system needs.
From about 2 kg (4.4 lb) to more than 50,000 kg (110,000 lb), depending on the process and the alloy. Send us the part details and we’ll confirm the right route.
A drawing or 3D model, the material and standard, quantities per order and per year, and any machining, finish or inspection requirements. If the grade isn’t settled yet, describe the service conditions and we’ll recommend one.
Cost depends on part weight, complexity, quantity, tooling, and the machining and inspection required, so we quote each part from your drawing. For what drives casting cost, see our guide How Much Do Metal Castings Cost?
Lead time depends on tooling, process and quantity. We confirm it with your quote, and on repeat orders we schedule supply around your production plan.
Yes, in New Zealand. Gray and ductile iron bar is stocked and cut to size. See Cast Iron Bar.