Name: F44 (254 SMO )
SKU: 0

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F44 (254 SMO )

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F44 (254 SMO )

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◉ PRODUCT SPECIFICATION

Product Description

254 SMO stainless steel, also known as UNS S31254, was originally developed for use in seawater and other corrosive chlorine environments. This grade is considered to be very high-end austenitic stainless steel; The main components are 19.5% to 20.5% chromium, 17.5% to 18.5% nickel, 6% to 6.5% molybdenum, and 0.18% to 0.22% nitrogen. These specific amounts of Cr, Ni, Mo and N in this “super austenitic” chemical composition enable 31254 to combine impact toughness against corrosion cracking with resistance to pitting and crevice corrosion. Its strength is almost twice that of 300 series stainless steel.

Due to the molybdenum content, UNS S31254 is often referred to as the “6% Molybdenum” grade; The 6% Moly series is able to withstand high temperatures and maintain strength under volatile conditions. The grade has gone beyond its original intent and overlaps with many industries, proving useful due to its high molybdenum content in other elements, which has enabled the 31254 to be successfully used in a variety of applications, such as flue gas desulfurization and chemical environments

Common Trade Names:

254 SMO / UNS S31254 / W.Nr 1.4547 / F44 /6MO

Specifications：

ASTM: S31254 / A182 / A276 / A479 / A240 / A312 / A312

ASME: S31254 / SA182 / SA276 / SA479 / SA240 / SA312 / SA312

Chemical Composition

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Physical Properties

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Mechanical Properties

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Fabrication and Heat Treatment

Machinability

Stainless steel grade 254 SMO™ is quite tough to machine due to the extremely high work hardening rate and lack of sulfur content; however using sharp tools, overpowered machine tools, positive feeds, good amount of lubrication, and slow speeds tend to provide good machining results.

Welding

Welding of stainless steel grade 254 SMO™ requires filler material without which it results in poor strength properties. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12.

Annealing

Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench.

Hot Working

Forging, upsetting and other operations relating to this material can be performed at 982 – 1149°C (1800 – 2100°F). It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. To re-attain maximum corrosion resistant properties, it is advisable to perform post-process annealing.

Cold Working

Cold working can be carried out using all the traditional methods; however the process would be tough due to its high work hardening rate. The result will provide the material with increased strength and toughness.

Hardening

Stainless steel grade 254 SMO™ does not respond to heat treatment. Hardening is possible only through cold reduction.

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