Austenitic Stainless Steel Manufacturer, Stockist & Exporter in India

The "6-Moly" & "7-Moly" Specialists (254 SMO / 654 SMO / AL-6XN) – Exotic Metals LLP

254 SMO (UNS S31254): The industrial standard for 6% Molybdenum alloys. It offers superior resistance to pitting and crevice corrosion in seawater and pulp bleaching plants
AL-6XN (UNS N08367): A 6-moly alloy with higher nickel content (24%) than 254 SMO, providing enhanced resistance to chloride stress-corrosion cracking (SCC)
654 SMO (UNS S32654): The "7-Moly" super-austenitic. It is the most corrosion-resistant stainless steel in the world, often outperforming Nickel Alloy 625 in high-chloride, high-temperature settings

Grade	Tensile Strength	Yield Strength	PREN Value
254 SMO	≥ 650 MPa	≥ 300 MPa	42–44
AL-6XN	≥ 750 MPa	≥ 380 MPa	46–48
654 SMO	≥ 750 MPa	≥ 430 MPa	55–57

904L (UNS N08904): A high-alloy austenitic steel with added Copper, designed specifically for resistance to sulfuric acid across a wide range of concentrations
Alloy 926 (UNS N08926): An upgraded version of 904L. By increasing the Molybdenum to 6.5% and adding Nitrogen, it provides significantly higher pitting resistance and mechanical strength than standard 904L

Unlike the "SMO" grades which focus on aqueous corrosion, 253 MA is a lean heat-resistant grade
Key Feature: It utilizes Rare Earth Metals (REM) and Nitrogen to provide excellent oxidation resistance up to 1150°C
Comparison: It offers high creep strength, often doubling the performance of Grade 310 at temperatures above 850°C, but at a lower nickel cost

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Diameter	904L (Density 7.95)	SMO 254 (Density 8.0)	AL-6XN (Density 8.06)
12 mm	0.89	0.90	0.91
25 mm	3.90	3.93	3.96
50 mm	15.60	15.71	15.82
100 mm	62.40	62.83	63.30