Stainless application
Stainless Steel for Energy & Power
Power equipment picks stainless for one of two reasons: corrosion in the working fluid, or oxidation and creep at temperature. The grade follows the duty — 304 for general steam-side service, 316L where chlorides are in the water, 321 and 310S where the metal runs hot enough that a stabilized or high-chromium grade is the only safe call.
Specification
What Energy & Power Specifies
| Grades normally used | 304 · 316L · 321 · 310S |
|---|---|
| Product forms | Boiler tube · Heat-exchanger tube · Plate · Fittings |
| Standards & approvals | ASTM A213 (seamless tube) · ASTM A249 (welded tube) · ASTM A240 (plate) · ASME Section II · EN 10216-5 |
Grade by grade
What Each Grade Does in Energy & Power
A stainless application page that lists grades without saying what each one is for is a catalogue, not a specification. These are the roles they actually play here.
| Grade | The job it does here | Detail |
|---|---|---|
| 310S | The high-temperature oxidation workhorse — furnace parts, radiant tubes and anything that runs continuously above about 950 °C. The high chromium and nickel keep the scale protective where 304 and 316L would oxidize away. | Specs → |
| 321 | The titanium-stabilized grade for the 425–815 °C band. The titanium ties up carbon so the weld does not sensitize, which is why it is the standard call for exhaust and intermediate-temperature steam service. | Specs → |
| 316L | Where the working fluid carries chlorides — condenser and heat-exchanger tube on brackish or treated water. The molybdenum resists pitting that would attack 304 in the same service. | Specs → |
| 304 | General steam-side and low-temperature boiler service where chlorides are absent. The economical default; step to 316L, 321 or 310S only when the fluid or the temperature demands it. | Specs → |
Before you send the enquiry
Specification Mistakes That Cost Money Here
None of this is exotic. All of it arrives on real enquiries, and each one adds a round trip before a price can be issued.
1. Specifying 304 for a chlorinated or brackish cooling-water tube. 304 pits under the scale and in the low-flow zones; 316L is the honest grade where chlorides are in the water.
2. Ignoring the 425–815 °C sensitization band. Plain 304 and 316L sensitize when welded or held in this range; the stabilized 321 or a low-carbon L grade is what survives it.
3. Ordering 310S as a strength grade. Its value is oxidation resistance, not strength — it is weak at temperature and should be designed for its hot-corrosion role, not as a structural member.
4. Leaving the tube standard off the order. Boiler and exchanger tube is ASTM A213 (seamless) or A249 (welded); writing just "stainless tube" gets the wrong product for the design.
Categories that serve it
What We Supply Into Energy & Power
Stainless Steel Coil
Cold-rolled and hot-rolled coil in 200 / 300 / 400 series.
Stainless Steel Sheet & Plate
Cold-rolled sheet and hot-rolled plate for structural and decorative use.
Stainless Steel Tube & Pipe
Seamless and welded round, square and rectangular tube.
Stainless Steel Bar & Rod
Round, flat, square and hexagonal bar, cold drawn or hot rolled.
Verification
What We Put in Writing for This Application
- Mill test certificate to the class your file requires — 2.2 or 3.1 — carrying the actual composition and mechanical values for the heat, so the grade is checkable against the order.
- Surface finish and gauge recorded before packing; photos of the sealed container.
- Where the market requires it, the food-contact, 3-A or coating test report with the issuing body named.
Before you ask
Energy & Power — Questions That Come Up
Which stainless grade for a heat exchanger running on brackish water?
316L is the usual call — the molybdenum resists the pitting that chlorides cause in 304. If the water is hot and strongly chlorinated, step to a duplex; if the duty is purely high-temperature on the steam side, 321 or 310S may be the right grade instead.
Why is 321 used for high-temperature exhaust and steam parts?
Titanium stabilization. The titanium ties up carbon so the material does not sensitize and lose corrosion resistance in the 425–815 °C band, where plain 304 and 316L are at risk — especially at welds.
What is the difference between ASTM A213 and A249 tube?
A213 covers seamless ferritic and austenitic boiler and heat-exchanger tube; A249 covers welded austenitic tube for the same duty. Name the right one — they are different products with different inspection and pressure capability.