Ohm Engineers lists carbon steel and stainless steels (304 / 316 / 316L) as the standard materials we work with on heat exchangers. Duplex and other alloys are used when the enquiry specifies them and mill supply supports the delivery. We do not publish a corrosion-rate table for every chemical — that belongs to your materials engineer.
Typical pairings (indicative, not a substitute for a spec)
| Service character | Often specified |
|---|---|
| Cooling water / steam utilities, non-corrosive process | Carbon steel |
| Mildly corrosive process, oxygenated water, many chemical duties | SS 304 / 316 / 316L |
| Chloride-bearing or specified sour/duplex duties | Duplex or other alloys — only if named |
What to write on the RFQ
Shell, channel, tubesheet, tubes, and bolting — each line. 'SS internally' is ambiguous (clad vs solid vs tubes only). Gaskets and packing must match the fluid. If you need NACE / ISO 15156, say so explicitly.
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