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Lightning Bolt & Supply Inc
10626 S Choctaw Dr
Baton Rouge, LA 70815

(225) 272-6200

Ferralium Fasteners - World Wide Shipping

Call Lightning Bolt when your project calls for super alloys. We have a long history in providing hard to find fasteners. This includes Ferralium nuts, hex bolts, stud bolts, washers, nuts, and a variety of Ferralium fasteners.

The latest and best performing Super Duplex has a long and distinguished ancestry from its origins as the first fully wrought 25cr Duplex over 40 years ago, being credited with coining the expression “Super Duplex”. Today Lightning Bolt is offering FERRALIUM 255 SD50, 255-SD40, and 255-SD3AF in a variety of nuts, bolts, and washers

Alloy 255 is used in many cost effective applications in the chemical, marine, metallurgical, municipal sanitation, plastics, oil and gas, petrochemical, pollution control, wet phosphoric acid, paper making and metalworking industries.

It is called "super" because it is more alloyed than ordinary stainless steels and has superior corrosion resistance, alloy 255 is being used in areas where conventional stainless' are insufficient. One good example s in the paper industry which was hit with an outbreak of corrosion problems when environmental laws forced recycling of process liquids In closed systems, chemicals such as chlorides can build up to extremely corrosive concentrations over time. Paper makers have found that ordinary stainless equipment, which had previously given good service, was no longer adequate for many applications.

Ferralium 255 a Duplex alloy has a high strength to weight ratio, with superior abrasion and cavitation resistance. It has a high resistance to chloride SCC, as well as crevice corrosion and pitting. In addition, it boasts good ductility with a high fatigue strength in marine applications. It bestows twice the yield strength of Alloy 20, and stronger than Duplex 2205. Ferralium 255 is an excellent 40°C critical pitting temperature (ASTM G48-Method A), twice that of Alloy 2205.

Industries have concluded that Alloy 255 is a cost effective alternative to materials such as the nickel alloys, 20 type alloys, brass and bronze. Marine environments have long been the domain of admiralty bronze. Lately, alloy 255 is replacing admiralty bronze, and the nickel alloys, in offshore platforms, deck hardware, rudders and shafting.

Alloy 255 is also making inroads in "borderline" corrosive applications where the nickel alloys and high performance alloys have been used but may not have been absolutely necessary. In some instances, it has even been used to replace high performance Ni-Cr-Mo-F-Cu alloys in the phosphoric acid industry. Fasteners, Valves, pumps, shafts, marine environments, Applications in down-hole, waste water, polycarbonate production, and demineralized water production. It is for these many anti-corrosive reason why industries depend on Lightning Bolt to offer nuts, bolts, washers, and other fasteners in Ferralium 255.

Primary Features of Alloy 255 Compared To 300 Series Austenitic Stainless Steels

  • Superior Corrosion Resistance

  • Pitting

  • Crevice Corrosion

  • Chloride Stress Corrosion Cracking

  • General Corrosion In Many Environments

  • Good Ductility

  • High Strength-To-Weight Ratio

  • High Fatigue Strength In Marine Environments

  • Superior Abrasion and Cavitation Erosion Resistance

  • High Mechanical Strength (over twice the yield strength of austenitic stainless steels)

  • Good Fabricability

FERRALIUM® alloy 255, also known by UNS S32550, has a chemical composition of: 
Cr 25.5, Ni 5.5, Mo 3.4 C 0.04, Mn 1.5, Si 1.0, Fe bal, N 0.175, S 0.030, Cu 2.00, P 0.040.

For More Information or to Place Orders


To learn more about our products, or to place an order, please call (225) 272-6200 or send an email to sales@lightningbolt.cc.  For calls placed from outside of the United States, please call 001-225-272-6200.

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