310S Stainless Steel Pipe 1.4845 UNS S31008 Heat Resistant

Name: 310S Stainless Steel Pipe
Brand: Alloy World

Product overview

What This Product Is For

310S, also known as 1.4845 or X8CrNi25-21 under EN and UNS S31008, is the grade used in very high temperature environments. Theoretically it withstands up to 1100 C, and its very high nickel and chromium content is what makes it durable against corrosion at that heat. It is one of the most common heat resistant stainless grades in high temperature applications.

Key Benefits

Theoretical service capability up to 1100 C, well above general purpose austenitic grades
Chromium 24.0 to 26.0 percent forms a stable scale in hot oxidising atmospheres
Solution annealed delivery condition ready for furnace service
Outside diameter 10 to 1067 mm covers thermocouple sheaths through to furnace ducting
Polished or mill pickled surface as the application requires

Stainless steel seamless pipes bundled and stacked for shipment

Who It Is For

Furnace and heat treatment equipment builders
Boiler and incinerator fabricators
Plant engineers replacing scaled 304 or 321 hot components
Buyers specifying 1.4845 or UNS S31008

Problems It Solves

Scaling and loss of section in general purpose austenitic pipe at furnace temperature
Short service life on heat treatment fixtures
Sourcing very large diameter heat resistant pipe
Confusion between 310, 310S and 310H when ordering

Application Scenarios

Furnace radiant tubes and retort piping
Heat treatment plant fixtures and walking beams
Boiler and incinerator hot gas ducting
Cement and petrochemical high temperature lines

Technical data

Specifications

Every value below is taken from the published product data. Where a figure is not published it is left out rather than estimated.

Grade	310S, 1.4845, X8CrNi25-21, UNS S31008
Standard	ASTM A249, A312, A213, JIS G3459, JIS G3463
Outside Diameter	10 to 1067 mm
Wall Thickness	1.5 to 150 mm
Length	1000 to 13000 mm
Chromium	24.0 to 26.0 percent
Maximum Service Temperature	Up to 1100 C theoretically
Surface Finish	180, 240 or 320 grit polished, mill pickled
Delivery Condition	Solution annealed
Packing	Woven bags and wooden cases

Technical Features

Very high nickel and chromium content for corrosion durability at temperature
Chromium 24.0 minimum to 26.0 maximum percent
Designations 1.4845, X8CrNi25-21 and UNS S31008
Theoretical temperature capability up to 1100 C
Supplied solution annealed

Materials

310S heat resistant austenitic stainless steel

Manufacturing Process

Seamless piercing and drawing
Tube welding
Solution annealing
Pickling and polishing

Quality Control

Chromium content confirmed within the 24.0 to 26.0 percent range
Carbon level checked to separate 310, 310S and 310H
Solution annealed condition verified before shipment
Dimensions measured against the ordered outside diameter and wall

Customisation Options

Polished or mill pickled surface
Cut length within the 1000 to 13000 mm range
Packing in woven bags or wooden cases

Use Guide

Confirm the actual operating temperature, since 1100 C is a theoretical ceiling rather than a continuous rating
Allow for thermal expansion on long hot runs when designing supports
Weld with a matching high chromium nickel filler
Specify woven bag or wooden case packing depending on transport handling

Comparison

How It Compares With the Alternatives

321 stainless pipe	321 holds good heat and corrosion resistance around 600 to 700 C, but where that is not enough 310 and 310S are chosen for higher temperatures
310 and 310H	The three differ mainly by carbon level, with 310S the low carbon variant used for general heat resistant service
Inconel 600 pipe	Alloy 600 costs more but adds chloride stress corrosion and alkali resistance that 310S does not offer