SPM supply a wide range of materials. 

• Super Duplex (both S32760 and S32750 / 2507)
• Duplex (S31803 / 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, Super Duplex, 6% Moly and Nickel Alloys.  Please see sub headings for further information on the actual materials.

• › Super Duplex
• › Duplex
• › 6% Moly

• › Nickel Alloys
• › Stainless Steels

Stainless Steels

Stainless steel is a steel alloy containing a minimum of 11% chromium. There are a number of different types of stainless steels based on changes to its crystalline structure.  When nickel is added, the austenite structure is stabilised, making steel that is non-magnetic and less brittle at low temperatures. Likewise, the addition of carbon makes stainless steels stronger.

Austenitic stainless steels count for over 70% of all production. These stainless steels contain enough nickel or manganese to retain their structure at all temperatures between freezing and melting points.

Superaustenitic steel has a higher nickel content ensuring a greater resistance to stress corrosion cracking. The addition of nitrogen and molybdenum also ensures a greater resistance to chloride pitting and crevice corrosion. Low carbon versions of superaustenitic steel avoid corrosion problems caused by welding. Because of the increased alloys, superaustenitic steels are more expensive than austenitic steels.

Ferritic stainless steels have a greater resistance to corrosion but are less durable than austenitic steels.

Martensitic stainless steels are extremely strong, durable and easy to manipulate by machine. Martensitic steels are also less resistant to corrosion then austenitic and ferritic steels. Precipitation hardened martensitic steels on the other hand, are comparable to austenitic and ferritic steels in terms of corrosion resistance, but are also tougher than standard martensitic grades.

Duplex stainless steels have an equal mixture of austenite and ferrite phases. Due to its ferretic qualities, duplex steel also shows very good resistance to stress corrosion cracking when compared to standard austenitic steels.  

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