SPM supply a wide range of materials. 

• Super Duplex S32750 / 2507 (both S32760 and S32750 / 2507)
• Duplex S31803 / S32205 / 2205 (S31803 / S32205 / 2205)
• 6% Moly (S31254)
• Nickel Alloys (Alloy 400, 625, 800, 825, etc)
• Stainless Steels (316L, 304L, 904L, 310, 321, etc

However our main scope of supply is Duplex S31803 / S32205 / 2205, Super Duplex S32750 / 2507, 6% Moly and Nickel Alloys.  Please see sub headings for further information on the actual materials.

• › Super Duplex S32750 / 2507
• › Duplex S31803 / S32205 / 2205
• › 6% Moly

• › Nickel Alloys
• › Stainless Steels

Duplex S31803 / S32205 / 2205

Duplex S31803 / S32205 / 2205 is a stainless steel made from a mixture of austenite and ferrite phases. Like most austenitic stainless steels, duplex has a strong resistance to corrosion, similar to those of a Type 304 and 316.

Unlike similar steels, duplex also displays an improved resistance to localised corrosion, particularly pitting, crevice corrosion and stress corrosion cracking. And because duplex has a lower nickel and molybdenum content than other austenitic stainless steels, it can prove a more cost effective option due to a lower alloying content.  

Due to its ferretic qualities, duplex steel also shows very good resistance to stress corrosion cracking when compared to standard austenitics.  In some cases, the strength of duplex steel can be up to double that of the most commonly used grades of stainless steel.

Duplex S31803 / S32205 / 2205 becomes brittle at extreme temperatures so its use is normally restricted to a maximum temperature of 300 degrees. Duplex S31803 / S32205 / 2205 also shows signs of embrittlement at –50 degrees.

Benefits:

• Stronger than 300 series stainless steel which also brings weight advantages.
• Cheaper than some stainless steels.
• High resistance to pitting, crevice corrosion and stress corrosion cracking.
• Higher heat conductivity and lower thermal expansion than austenitic steels.

Uses:

• Pipes for production and transportation of oil and gas
• Structural and mechanical components
• Heat exchangers
• Cooling pipes
• Cargo vessels and containers
• High strength wiring

For more information on our range of duplex products, please contact us today.