Technocast Foundry manufactures machined grey iron, ductile (SG) iron and steel castings from 1 kg to 1,500 kg in a single piece, at Arasur, Coimbatore, Tamil Nadu, India. Five moulding routes cover low, mid and high volumes, and parts can leave the plant machined, coated, assembled and tested.
What Castings Do We Make?
We group castings by the industry they serve, because that is how buyers search for them. Every range is poured, heat treated and machined on the same site at Arasur, Coimbatore.
Automotive
Ductile & Grey Iron
Engine and gearbox mounts, suspension brackets, lever arms and pulleys — usually machined and CED coated before despatch.
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Off-Highway Vehicles
Ductile Iron & Steel
Axle housings, wheel hubs, carriers and steering knuckles for tractors, loaders and material handling machines.
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Transmission
Ductile & Grey Iron
Gearbox cases, differential housings, flywheel hubs and gear blanks, machined to sealed joint faces and balanced.
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Pumps & Valves
Iron & Stainless
Casings, volutes, impellers, valve bodies and flanged fittings — PED certified and pressure tested in house.
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Wind Energy
Ductile Iron
Large ductile iron housings, bearing supports and torque arms up to 1,500 kg, cast on a dedicated No Bake line.
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Construction
Ductile Iron & Steel
Swing frames, boom brackets, links and roller parts, available fabricated, painted and load tested as sub-assemblies.
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Machine Tool
Grey Iron
Grey iron beds, columns, saddles and spindle housings, stress relieved so the geometry holds.
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Not sure which range your part belongs to? Send the drawing and we will tell you which line it suits.
Materials
Grey iron, ductile (SG) iron and steel, in a rough 30 / 60 / 10 split of monthly output. Every heat is checked on an ARL spectrometer before it is poured, and grades are matched to your drawing.
Grey Cast Iron
EN-GJL-250 to EN-GJL-300. Around 30 per cent of what we pour. Grey iron damps vibration and machines easily, which is why it suits machine tool beds, gearbox housings and pump bodies.
Ductile (SG) Iron
EN-GJS-400-18 to EN-GJS-900-2. Around 60 per cent of output and our largest family. Ductile iron adds strength and elongation, so it takes the load in transmission housings, hubs, brackets and wind energy parts.
Carbon Steel
IS 1030 and ASTM A27 / A148 / A216. Cast steel is used where the part has to take shock loading or higher temperature than iron will tolerate, typically in earthmoving and valve work.
Alloy Steel
IS 7598 and ISO 683-7. Alloy steel is specified where wear resistance or through-hardening matters. Machined parts are also supplied in 20MnCr5.
In-House Capability
Everything below happens at Arasur under one management. That is what lets us quote a raw casting or a finished, painted, assembled and tested part from the same enquiry.
DISA high pressure line, ARPA 450, ARPA 1300, shell moulding and the Alpha-set No Bake line. Box sizes run from 510 x 610 x 400 mm up to floor moulding at 2,000 x 2,000 x 700 mm, so one part number can be quoted at 200 pieces or 20,000.
Medium frequency induction furnaces, 1 tonne dual track, four of them, rated at 60 tonnes a day, plus a separate 1.5 tonne dual-track melting bay for the No Bake line. The high pressure line pours automatically.
Five cold box core shooters from 5 kg to 30 kg, one 5 kg shell core shooter and a four-table CO2 facility. Cold box accounts for 70 per cent of cores, shell 20 per cent and CO2 10 per cent.
Twenty vertical machining centres, four horizontals including a five-axis, five vertical turret lathes, thirteen turning centres, vertical turning to 1,750 mm diameter, gear shaping and dynamic balancing to 1 gram. Castings can be shipped fully machined.
Normalising, annealing, stress relieving and hardening are carried out on site, so a part does not leave the plant to be treated and come back.
Gear cutting, dynamic balancing, high pressure washing, fabrication in TIG, MIG and arc welding, sheet perforation and forming, and sub-assembly with bought-in steel, brass, PTFE, stainless and rubber components. Load testing is done on a 2,000 tonne hydraulic press to customer specification.
Process Flow
Twelve steps between the pattern store and the packing bay. Every one of them happens on our own site.
Tooling is stored, indexed and checked before a job is scheduled, so a repeat order does not wait on pattern hunting.
Cores are shot in cold box, shell or CO2, depending on the geometry and the volume.
The part is moulded on whichever of the five routes suits its size and quantity.
Charge is melted in medium frequency induction furnaces and held to the target chemistry.
Every heat is read on an ARL spectrometer and corrected before it is allowed to pour.
The high pressure line pours automatically, which keeps pouring temperature and rate consistent from mould to mould.
Moulds are broken out and sand is returned to the plant for reuse.
Nodularity, tensile, elongation and hardness are checked on samples from the same heat.
Runners, risers and parting lines are removed. An automatic five-axis fettling cell is being added during 2026.
The casting moves to the CNC shop for turning, milling, boring, gear cutting and balancing as the drawing requires.
Dimensions are confirmed on a coordinate measuring machine, with ultrasonic, magnetic particle or pressure testing where specified.
Primer painting is done in house. ED, CED, powder, zinc, manganese phosphate and galvanised finishes are arranged through partners. The part is then packed and documented.
Surface Finish
Primer painting is done at Arasur. Every other finish below is arranged through established coating partners, so you still place one order and receive one finished part.
| Finish | Where it is done |
|---|---|
| Primer painting | In house at Arasur |
| ED and CED coating | Coating partner |
| Powder coating | Coating partner |
| Zinc coating | Coating partner |
| Manganese phosphating | Coating partner |
| Galvanised coating | Coating partner |
Foundry Operations
Five moulding routes, four induction furnaces and a core shop that feeds all of them — from a 1 kg bracket to a 1,500 kg housing.
Machine Shop & Quality
Castings leave Arasur fully machined, heat treated and inspected — and, where the customer needs it, fabricated and assembled as well.
Common Questions
Grey iron, ductile (SG) iron and steel castings, supplied raw or fully machined. Output is roughly 60 per cent ductile iron, 30 per cent grey iron and 10 per cent steel.
From 1 kg to 1,500 kg in a single piece. The moulding route is chosen to suit the weight and the quantity.
Grey iron in EN-GJL-250 to EN-GJL-300, ductile iron in EN-GJS-400-18 to EN-GJS-900-2, cast steel to IS 1030 and ASTM A27, A148 and A216, and alloy steel to IS 7598 and ISO 683-7.
Yes. The CNC machine shop has 20 vertical machining centres, 4 horizontals, 5 vertical turret lathes and 13 turning centres, plus gear shaping and dynamic balancing, so parts can ship machined and ready to fit.
Yes. Five moulding routes cover low, mid and high volumes. The No Bake and ARPA lines suit low and mid runs; the DISA high pressure line runs 100 to 120 moulds an hour for high volumes.
Automotive, off-highway vehicles, transmission and powertrain, pumps and valves, wind energy, construction and earthmoving, and machine tools.
Yes. Around 75 per cent of output is exported, mainly to the United States, Europe and the rest of Asia. The remaining 25 per cent stays in India.
Primer painting is done in house. ED and CED, powder, zinc, manganese phosphate and galvanised finishes are arranged through coating partners.
At 127/3B, Sangothipalayam Road, Arasur, Coimbatore, Tamil Nadu 641407, India. Foundry, machine shop and testing are on one 523,200 sq ft site at Arasur, on the eastern side of Coimbatore.
Certifications
Send a Drawing
Send the drawing with the material grade, the single-piece weight and the annual quantity to our foundry at Arasur, Coimbatore. You get back the moulding route we would use, a lead time and a price.
Before you go
Our brochure and every current certificate, in PDF, for your vendor file.
Or send us a drawing
