Superior Oxidation Resistance For Boiler And Furnace Applications
Heat resisting stainless steel pipes are premium austenitic alloys tailored for extreme thermal service, providing unmatched boiler pipe protection via robust resistance to oxidation, carburization, and sulfidation.
Superior Oxidation Resistance For Boiler And Furnace Applications
Heat resisting stainless steel pipes are premium austenitic alloys tailored for extreme thermal service, providing unmatched boiler pipe protection via robust resistance to oxidation, carburization, and sulfidation.
Heat resisting stainless steel pipes are premium austenitic alloys tailored for
extreme thermal service, providing unmatched boiler pipe protection via robust resistance to
oxidation, carburization, and sulfidation. Grades like 310 and 310S, featuring 24-26% chromium and 19-22% nickel,
support continuous operation up to 1050°C and intermittent exposure to 1035°C, forming a protective chromia scale
that combats scaling in aggressive atmospheres.
Fabricated through hot piercing or cold pilgering with solution annealing at 1040-1065°C followed by rapid quenching, heat resisting stainless steel pipes optimize phase stability and intergranular corrosion resistance, with low-carbon 310S variants minimizing sensitization risks during welding. The austenitic matrix delivers superior creep strength and thermal fatigue endurance over ferritic grades, ideal for oxidation resistant steel pipes in fluidized bed combustors and heat treatment retorts. Offered in NPS 1/8 to 30 with schedules 5S to XXS and lengths to 20 ft, they accommodate U-bends and threaded ends for versatile boiler pipeline protection in compact exchanger bundles.
For boiler pipe protection, these pipes thwart tube metal wastage from ash erosion and hydrogen
attack, boasting tensile strengths of 520 MPa minimum and yields of 205 MPa at ambient, retaining 67.8 ksi ultimate
at 1000°F for reliable pressure containment up to 150 bar.
Versus standard 304, high temperature steel tubes such as 310 exhibit 20-30% higher rupture
strength at 1200°F and better carburization resistance, enabling thinner walls for weight savings in aerospace ducts
and kiln linings.
Countering prevalent threats like sigma phase embrittlement or polythionic cracking in shutdowns, oxidation
resistant steel pipes boost run lengths by 40-60% in cyclic operations, curbing outages in biomass and
waste-to-energy plants.
Typical composition for key heat-resisting grades (wt. % max unless specified;
balance Fe).
| Grade | C | Mn | Si | P | S | Cr | Ni | Others |
|---|---|---|---|---|---|---|---|---|
| 310 | 0.25 | 2.00 | 1.50 | 0.045 | 0.030 | 24.0-26.0 | 19.0-22.0 | - |
| 310S | 0.08 | 2.00 | 1.50 | 0.045 | 0.030 | 24.0-26.0 | 19.0-22.0 | - |
| 309 | 0.20 | 2.00 | 1.00 | 0.045 | 0.030 | 22.0-24.0 | 12.0-15.0 | - |
| 321 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-13.0 | Ti: 5xC min |
| 347 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-13.0 | Nb+Ta: 10xC min |
Minimum values at room temperature for annealed condition; high-temp data for
310S.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HV max) |
|---|---|---|---|---|
| 310/310S | 520 | 205 | 40 | 225 |
| 309 | 515 | 205 | 40 | 217 |
| 321 | 515 | 205 | 40 | 217 |
| 347 | 515 | 205 | 40 | 217 |
| Temperature (°F) | Ultimate Tensile (ksi) | Yield (ksi) | Elongation (%) |
|---|---|---|---|
| 70 | 80.0 | 35.0 | 52 |
| 1000 | 67.8 | 20.8 | 47 |
| 1400 | 35.1 | 19.3 | 46 |
| 1600 | 19.1 | 12.2 | 48 |
Endures up to 1050°C continuous service with stable chromia scaling for reliable high temperature steel tubes in furnaces.
Maintains 14.4 ksi rupture strength at 1200°F, enhancing boiler pipe protection against thermal fatigue.
High Cr-Ni alloy combats aggressive atmospheres, ideal for corrosion resistant high temp pipes in refineries.
Solution annealing enables crack-free GTAW joints without PWHT for oxidation resistant steel pipes.
50-70% longer life reduces downtime and costs in demanding heat resisting stainless steel pipes uses.
Retains ductility to -450°F, versatile for dual high/low-temp applications in industrial piping.
Engineered to meet diverse industrial needs with robust materials and versatile designs.
Suitable applications include vehicle exhausts, steam environments, and elevated temperature components.
Used across process industries with bead-worked welds, fixed lengths, and strict testing.
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