01Materials
Materials & standards
We pour gray iron, ductile iron, compacted graphite iron, abrasion-resistant white iron and high-chromium iron, along with alloy steel and stainless steel. The grades below come from recently shipped parts; other grades can be produced on request.
Common cast iron, cast steel and stainless steel grades have all been tested for physical properties by a third party. If your grade is not listed, note the standard on your drawing and we will confirm it with the quote.
| Material | Recent grades | Standard | Typical parts |
|---|---|---|---|
| Gray iron | Class 30 · 40 · 50 | ASTM A48 | Bearing housings, pedestals, discharge bodies, head plates |
| Gray iron (pressure parts) | Class 40 | ASTM A278 | Cylinders, cylinder covers, bearing retainers |
| Gray iron | HT200 · HT300 | GB/T 9439 | Motor end covers, junction boxes; machine tool bases and columns |
| Ductile iron | 60-40-18 · 65-45-12 · 80-60-03 | ASTM A536 | Pump casings, suction plates, stuffing boxes, valve housings |
| Ductile iron | QT450-10 | GB/T 1348 | — |
| Compacted graphite iron | On request | GB/T 26655 | High-speed train brake disc development (2015) |
| Abrasion-resistant white iron, high-chromium iron | Class IA and others | ASTM A532 | Wear parts |
| Cast steel | 90-60 · WCC | ASTM A148 · A216 | — |
| Stainless steel | CF8M | ASTM A351 | — |
| China · GB/T | Europe · EN | USA · ASTM | Japan · JIS |
|---|---|---|---|
| HT200 | EN-GJL-200 | A48 Class 30 | FC200 |
| HT250 | EN-GJL-250 | A48 Class 35 / 40 | FC250 |
| HT300 | EN-GJL-300 | A48 Class 45 | FC300 |
| HT350 | EN-GJL-350 | A48 Class 50 | FC350 |
| QT400-18 | EN-GJS-400-18 | A536 60-40-18 | FCD400-18 |
| QT450-10 | EN-GJS-450-10 | A536 65-45-12 | FCD450-10 |
| QT600-3 | EN-GJS-600-3 | A536 80-60-03 | FCD600-3 |
02Molding & melting
Molding, melting & heat treatment
We select the molding process, or a combination of processes, based on part size, geometry and appearance requirements. New parts first go through casting simulation of filling and solidification to optimize the gating system. Every heat of iron is analyzed for composition before pouring.
High-mix, low-volume production. Orders start at one piece.
Resin sand
No-bake resin sand molding delivers stable dimensions. Suited to medium and large parts.
- Best for
- Medium and large parts
Resin-coated sand
Shell molds and cores made from resin-coated sand. Suited to small parts with fine detail and internal cavities.
- Best for
- Small parts
Green sand
Clay-bonded green sand molding for small parts in high volume, at a low cost per piece.
- Best for
- High-volume small parts
| Step | Equipment | Purpose |
|---|---|---|
| Patterns | In-house pattern storage, 1,000+ sets | Repeat orders need no new pattern tooling |
| Melting | 24-pulse medium-frequency induction furnace | Clean melting and controlled chemistry for gray and ductile iron |
| Composition | SPECTRO optical emission spectrometer (Germany) | Pre-pour analysis of 29+ elements |
| Heat treatment | Heat treatment furnace | Stabilizes microstructure and relieves stress before machining |
| Surface finishing | Shot blasting, grinding, gate and riser removal | Finished surfaces; gates and risers removed |
03CNC machining
CNC machining, in-house
Castings can leave the plant fully machined. Operations are planned around the tolerances on your drawing. Our equipment includes machining centers, vertical lathes, boring machines, gantry milling machines, CNC lathes and drilling machines, with a maximum load of 20 t and a maximum cutting diameter of 4,500 mm.
The table lists our main machining equipment. See Equipment for the full list.
| Machine | Work envelope (mm) | Accuracy | Photo |
|---|---|---|---|
| Horizontal boring & milling center | X 3,000 · Y 2,000 · Z 1,500 | 0.01 mm |  |
| Gantry machining center | X 3,200 · Y 2,200 · Z 1,000 | 0.025 mm |  |
| Horizontal machining center | X 2,000 · Y 1,200 · Z 1,200 | 0.01 mm |  |
| Vertical machining center | X 1,300 · Y 800 · Z 700 | 0.012 mm |  |
| Vertical machining center | X 850 · Y 550 · Z 600 | 0.008 mm |  |
| 4 m vertical lathe (DRO) | Ø 4,000 × H 2,500 | 0.05 mm |  |
| 2.5 m vertical lathe (DRO) | Ø 2,500 × H 1,300 | 0.05 mm |  |
| CNC vertical lathe | Ø 1,250 × H 850 | 0.01 mm |  |
| Floor-type boring mill | X 3,000 · Y 2,500 · Z 1,300 | 0.05 mm |  |
| Gantry milling machine | X 2,000 · Y 1,600 · Z 1,000 | 0.05 mm |  |
04Painting & packing
Painting & export packing
Since 2014 we have delivered parts fully finished: primed or top-coated as specified, then stretch-wrapped and crated for shipment.
Paint line
Overhead conveyor with automatic circulation and drying. Complex parts receive a uniform coat.
Dip-coating line
Parts are dipped, then dried, with full paint coverage of internal cavities.
Export packing
Wooden pallets and crates built to part size, with custom steel frames for overweight parts. Ships by sea, land or air.
05Quality
Quality & inspection
Our lab tests chemical composition, mechanical properties and microstructure. Sample parts undergo full dimensional inspection on a CMM, and batch production starts only after they pass.
| Test | Equipment | Report |
|---|---|---|
| Chemical composition | SPECTRO optical emission spectrometer, 29+ elements | Composition report |
| Mechanical properties | 30 t tensile testing machine, hardness tester | Tensile · elongation · HB · HRC |
| Microstructure | Metallographic microscope | Micrographs |
| Dimensions | CMM (coordinate measuring machine), full dimensional inspection | Full dimensional inspection report |
| Surface and coating | Surface roughness tester, paint film thickness gauge | Ra · paint film thickness |
| Pouring temperature | Thermocouple measurement | — |
| Pressure tightness | Hydrostatic testing machine | Hydrostatic test |
| Static balance | Static balancing equipment | On request |
| Third-party inspection | Chinese and international inspection agencies accepted | On request |
| Standard | Certificate no. | Valid until | Download |
|---|---|---|---|
| ISO 9001:2015 · Quality | 39324Q1078R1M | 2027-01-20 | PDF ↓ |
| ISO 14001:2015 · Environmental | 39324E1054R1M | 2027-01-20 | PDF ↓ |
| ISO 45001:2018 · Occupational health & safety | 39324S1051R0M | 2027-01-15 | PDF ↓ |
06Size & weight
Part size & weight range
Small and large parts alike are cast and machined in-house.
For parts beyond this range or with unusual geometry, send your drawing for review.
- Unit weight
- 0.1 kg – 10 t
- Max. cutting diameter
- 4,500 mm
- Minimum order
- 1 piece