Alloy 310H (UNS S31009) has a carbon content restricted to exclude the lower end of the 310 range. This makes 310H the grade of choice for high temperature applications. This steel has good resistance to oxidation at temperatures of up to 1040°C (1904°F) in intermittent service and 1150°C (2102°F) in continuous service. It is widely used in environments where sulfur dioxide gas is present at high temperatures; however it is recommended that this steel should not be continuously used at 425-860°C (797-1580°F) range due to carbide precipitation.

STANDARDS
INDUSTEEL TRADEMARKS		UNS	ASTM	EURONORMS EN	SUS
310S		S31009	310H	1.4845	SUS 310H
CHEMICAL ANALYSIS (%WEIGHT)
C	Cr	Ni	Mo	N	Others
< 0,100	25	19,5	-	-	-

PROPERTIES
0,2 Y.S. - Rp 0,2min ASTM / EN		0,2 Y.S. - Rp 0,2(2)typical value		UTS - Rm min ASTM / EN		UTS - Rm(2)typical value		EI-A(1)%	PREN(4)	HOMOLOGATIONS
MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi			Last revised
210	30	280	41	515	75	564	82	40	25	-

Penn Stainless Alloy 310H Plate and Processed Flat Bar provides superior resistance to corrosion and heat exposure, in even the most demanding environments.

Corrosion Resistance:

• The high chromium content – intended to increase high temperature properties – also gives this grades good aqueous corrosion resistance.
• In high temperature service, 310H exhibits good resistance to oxidising and carburising atmospheres. 

Heat Resistance:

• 310H has good resistance to oxidation in intermittent service in air at temperatures up to 1040°C and 1150°C in continuous service.
• Good resistance to thermal fatigue and cyclic heating. Widely used where sulphur dioxide gas is encountered at elevated temperatures.
• Continuous use in 425-860°C range not recommended due to carbide precipitation, if subsequent aqueous corrosion resistance is needed, but it often performs well in temperatures fluctuating above and below this range.
• Prone to sigma phase embrittlement in the temperature range 650 – 900°C.
• Grade 310H is generally used at temperatures starting from about 800 or 900°C – above the temperatures at which 304H and 321 are effective

 Fabrication:

• Commonly used in the heat treatment and process industries due to high temperature and corrosive environments
• Often fabricated into complex structures
• Roller-forms, stamps and draws readily
• Because 310 work hardens, severe forming operations should be followed by an anneal

Weldability:

• Austenitic stainless steel is generally considered to be weldable
• Generally considered to have weldability equivalent to 304 and 304L
• Special consideration is needed to compensate for a higher coefficient of thermal expansion to avoid warping and distortion

APPLICATIONS
CHEMICAL INDUSTRIES			PROCESS INDUSTRIES			WATER TREATMENT			STORAGE & TRANSPORTATION
Nitric Acid	Sulfuric Acid	Polymer& otheracids	Fertilisers	Pulp& Paper	Hydrome-tallurgy	Seawater& desalination	Freshwater &Tanks	Waste Water	Chemical Tanks	Cryogenic Tanks	Renewable

POWER GENERATION				OIL & GAS			CONSTRUCTION
Nuclear	Pollution control	Hydroelectric	Renewable	Off & Onshore & production	Refining & Gas processing	Petrochemical	Architecture	Bridges

For more technical details :
Download the complete datasheet
(1) Indicative typical values
(2) Indicative typical values for thickness 20 mm at RT for transverse direction
(3) Hardening 496°C (925°F), 4h, air cooling
(4) PREN = Cr + 3.3 Mo + 16N
(5) PRENW = Cr + 3.3(Mo + 0.5W) + 16N
(6) HT: mechanical properties depend on heat treatment

PDF: http://www.industeel.info/wp-content/uploads/2016/01/DS-INOX-SIRIUS310Sv2.pdf