ASTM A312 253MA UNS S30815 High Temperature Resistant Stainless Steel Seamless Pipe for Furnace Radiant Tubes

ASTM A312 253MA / UNS S30815 / EN 1.4835 Stainless Steel Seamless Pipe for Industry
 
 

ASTM A312 253MA is a seamless austenitic stainless steel pipe manufactured to ASTM A312 / ASME SA312 in the grade UNS S30815 — marketed as 253MA, standardised in Europe as EN 1.4835 / X9CrNiSiNCe21-11-2 and listed as SS 2368. It is supplied pickled and annealed, in outside diameters from 3/8″ to 48″, wall schedules from SCH 5S to SCH XXS, with plain or beveled ends in fixed or random lengths.

Buyers specify it for the hot end of a plant: radiant tubes, muffles, furnace rollers, retorts, recuperators, thermowells and high-temperature gas-to-gas heat exchangers. The problem it solves is narrow and expensive to get wrong. Below roughly 900 °C, 304H and 316H are adequate. Above it, the failure mode changes from corrosion to oxide scale spalling under thermal cycling: the protective layer cracks on shutdown, fresh metal is exposed, the wall thins, and the tube eventually perforates — usually on a cold start, not on a steady run. 310S resists oxidation but has to be ordered in a heavier wall to hold creep strength, which adds weight, welding time and cost.

Specification

Equivalent Grades of ASTM A312 253MA Stainless Steel Seamless Pipe Pickling

Chemical Composition % of ASTM A312 253MA UNS S30815 Stainless Steel Seamless Pipe

 
Mechanical Properties of STM A312 253MA UNS S30815 Stainless Steel Seamless Pipe

Compliance notes to settle before ordering

This grade is engineered for oxidising service. It is not the right answer for aqueous chloride pitting or wet chloride stress-corrosion service, for strongly reducing atmospheres, or for high-sulphur fuel environments at the top of the temperature range — in those cases an alternative grade (310S, Alloy 800H or a nickel-base alloy) should be reviewed with our metallurgists before the order is placed. Where the pipe will be welded on site, confirm that the specified filler metal and post-weld pickling match the cerium-bearing chemistry; we can supply the welding procedure and consumable recommendation with the mill certificate package. Pressure-retaining applications under PED or ASME require the design code to be stated on the enquiry so the test and documentation scope can be aligned at quotation stage.

Application

253MA is chosen where the operating envelope combines high metal temperature, mechanical load and an oxidising atmosphere. Typical service industries and components:

1. Industrial furnaces — radiant tubes, muffles, retorts, furnace rollers, conveyor belts and fixtures, annealing and carburising furnace furniture.
2. Heat exchangers — high-temperature gas-to-gas and gas-to-liquid recuperators, where flue gas above 900 °C is used to preheat combustion air.
3. Petrochemical and refining — coke oven components, burner nozzles, thermowells, flare tips and high-temperature process lines.
4. Power generation — biomass and coal-fired boiler superheater supports, soot-blower components and pollution control equipment.
5. Mining and minerals — sintering plant and pelletising furnace internals, where abrasion and oxidation act together.
Lime, cement and glass — thermocouple protection tubes, burner lances and kiln internals exposed to cyclic heating.