Key differences between Duplex Stainless Steel and Super duplex stainless steel (R)

𝐊𝐞𝐲 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞𝐬 𝐛𝐞𝐭𝐰𝐞𝐞𝐧 𝐝𝐮𝐩𝐥𝐞𝐱 𝐬𝐭𝐚𝐢𝐧𝐥𝐞𝐬𝐬 𝐬𝐭𝐞𝐞𝐥 𝐚𝐧𝐝 𝐬𝐮𝐩𝐞𝐫 𝐝𝐮𝐩𝐥𝐞𝐱 𝐬𝐭𝐚𝐢𝐧𝐥𝐞𝐬𝐬 𝐬𝐭𝐞𝐞𝐥:

1- 𝑪𝒉𝒆𝒎𝒊𝒄𝒂𝒍 𝑪𝒐𝒎𝒑𝒐𝒔𝒊𝒕𝒊𝒐𝒏: 

✧ Super duplex stainless steels have high chromium and molybdenum contents, typically in the range of 24-26% chromium and 3-5% molybdenum. It also contains more nickel and nitrogen compared to duplex stainless steel.

2- 𝑺𝒕𝒓𝒆𝒏𝒈𝒕𝒉: 

✧ Super duplex stainless steel has higher strength than duplex stainless steel and is suitable for applications that require improved mechanical properties and stress corrosion cracking resistance.

3- 𝑪𝒐𝒓𝒓𝒐𝒔𝒊𝒐𝒏 𝑹𝒆𝒔𝒊𝒔𝒕𝒂𝒏𝒄𝒆:  

✧ Super duplex stainless steel offers even better corrosion resistance, especially in aggressive environments such as chloride-containing solutions. This makes super duplex stainless steel suitable for applications in marine and offshore environments, chemical processing, and the oil and gas industry.

4- 𝑾𝒆𝒍𝒅𝒂𝒃𝒊𝒍𝒊𝒕𝒚: 

✧ Super duplex stainless steels, on the other hand, require more rigorous welding processes and heat treatments due to their higher alloy content. Other aspects such as proper welding procedures, control of heat input, and use of appropriate filler metals are important to maintain the integrity and properties of super duplex stainless steel welds.

5- 𝑷𝒓𝒊𝒄𝒆: 

✧ Super duplex stainless steels are generally more expensive than duplex stainless steels due to their higher alloy content and better properties.

S𝘂𝗽𝗲𝗿 𝗗𝘂𝗽𝗹𝗲𝘅 𝗧𝘆𝗽𝗲𝘀, 𝗨𝗡𝗦, 𝗮𝗻𝗱 𝗔𝗦𝗠𝗘 𝗗𝗲𝘀𝗶𝗴𝗻𝗮𝘁𝗶𝗼𝗻𝘀:

• Type 2507 (UNS S32750, ASME SA-182 F53): This is the most commonly used super-duplex grade and is characterized by excellent resistance to pitting and crevice corrosion, high strength, and good weldability.
  

• Zeron 100 (UNS S32760, ASME SA-182 F55): Zeron 100 is known for its excellent resistance to chloride stress corrosion cracking and exhibits excellent toughness and resistance to aggressive environments.

• Ferarium 255 (UNS S32550, ASME SA-182 F61): Known for its excellent resistance to corrosion, fatigue, and erosion, Ferarium 255 provides superior strength and excellent weldability.
  

• LDX 2101 (UNS S32101, ASME SA-240 S32101): This grade provides a cost-effective solution with excellent corrosion resistance and high strength.
  

• LDX 2101 has excellent resistance to chloride stress corrosion cracking and low nickel content.

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