309/S30900/SUS 309TB Stainless Steel
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Alloy 309 (UNS S30900) austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic Alloy 304.


General Properties

Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance applications. The alloy resists oxidation up to 1900°F (1038°C) under non-cyclic conditions. Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C).

Because of its high chromium and low nickel content, Alloy 309 can be utilized in sulfur containing atmospheres up to 1832°F (1000°C). The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption. Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced.

When heated between 1202 – 1742°F (650 – 950°C) the alloy is subject to sigma phase precipitation. A solution annealing treatment at 2012 – 2102°F (1100 – 1150°C) will restore a degree of toughness.

309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.

Alloy 309 can be easily welded and processed by standard shop fabrication practices.



STANDARDS
INDUSTEEL TRADEMARKS UNS ASTM EURONORMS EN SUS
4828 (Prev. S12) S30900
309 1.4828 SUS 309TB
CHEMICAL ANALYSIS (%WEIGHT)
C Cr Ni Mo N Others
< 0,100 19,5 11,5 - - Si = 1.6

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
230 33 345 50 550 80 626 91 40 20 -
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-SIRIUS4828v2.pdf
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