Stainless Steel, AusteniticS32109 (321H) Fittings and Flanges

A higher carbon modification of stainless steel 321 which provides greater strength at elevated temperatures.

321H is able to withstand higher temperatures than type 321, due to its elevated carbon levels. While 321H displays the same welding and forming characteristics of type 321, the metal cannot be hardened by heat treatment.

It is utilized in situations where type 321 cannot withstand the high temperatures. Type 321H displays better resistance against creep than both 321 and 304 stainless steels.

321H also shows resistance against acid corrosion in a variety of environments. Lower temperatures provide better resistance, but the metal is able to withstand up to a 10% acid solution, that has been diluted, at elevated temperatures. However, the metal shows very little resistance against chlorine or sulfuric solutions at any given temperature.

Given their similar composition and characteristics, it is possible for stainless steels 321 and 321H to become dually certified.

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Properties

Chemical Composition

Chemical Element	% Present
Carbon (C)	0.04 - 0.10
Chromium (Cr)	17.00 - 19.00
Nickel (Ni)	9.00 - 12.00
Manganese (Mn)	0.00 - 2.00
Phosphorous (P)	0.00 - 0.04
Sulphur (S)	0.00 - 0.03
Silicon (Si)	0.00 - 1.00
Titanium (Ti)	0.00 - 0.60
Iron (Fe)	Balance

Mechanical Property	Value
Proof Stress	205 Min MPa
Tensile Strength	515 Min MPa
Elongation A50 mm	30 Min %

Applications

Aircraft exhaust stacks and manifolds
Jet engine parts
Weld equipment
Chemical processing equipment

Characteristics

Good low corrosion resistance to low content of hydrochloride and organic acids
Very good resistance to raised temperature

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Disclaimer

This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon. Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed S online) and manufacturers' data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources. Material supplied by the Company may vary significantly from this data but will conform to all relevant and applicable standards. As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied. Advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. All transactions are subject to the Company's current Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.