Stainless Steel Pipe & Tube for Chemical & Petrochemical Plant

In chemical process plant the deciding factor is almost never "stainless or not" -- it is which stainless, against a specific chemistry at a specific concentration and temperature. The same acid can be handled comfortably at one concentration and attack the same grade aggressively at another.

What drives material selection here

Specific process chemistry, concentration and temperature together
Chloride-induced pitting and crevice corrosion
Sensitisation at welds, which is where corrosion usually starts first
Stress corrosion cracking above roughly 60 °C where chlorides and tensile stress coincide
Cleanability and the avoidance of dead legs where product can stagnate

Grades commonly specified

Grade selection guidance for this service. Confirm against your own process conditions.
Grade	Why it is specified
316L	The default for welded process lines carrying aggressive chemistry. Molybdenum for pitting resistance, low carbon for the weld zone.
304L	Welded service where the chemistry is mild and chlorides are genuinely absent.
321	Where the line runs hot enough, long enough, that carbide precipitation in service is the concern rather than carbide precipitation during welding.
310S	High-temperature oxidising duty such as furnace and reformer service, where scaling resistance governs.

Standards this sector commonly specifies

ASTM A312 / ASME SA312
ASTM A358 (EFW)
ASME B36.19M
EN 10204 3.1

These are the specifications buyers in this sector typically call for. Material is supplied against the specification stated on your order — confirm the standard and certificate type at enquiry stage. See mill test certificates and EN 10204 types.

Worth knowing before you specify

Where hot chlorides and tensile stress occur together, austenitic grades are susceptible to stress corrosion cracking and the correct answer is often a duplex grade rather than 316L. We would rather tell you that than sell you 316L and let the plant find out.

Tell us the duty, not just the grade

The fastest route to a useful quotation is the service conditions. For this application that means:

The medium, its concentration and its temperature
Whether the line will be welded
Chloride content
Required finish and specification

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