A special type of stainless steel called duplex is distinguished by its balanced microstructure, which consists of roughly equal amounts of ferrite and austenite. Its dual-phase structure improves its corrosion resistance and mechanical qualities, making it a popular option across a number of industries. Duplex stainless steel normally comprises at least 30% of the lesser phase by volume, though this is not strictly specified.
Overview of Duplex Stainless Steel Grades
Due to its exceptional strength and resistance against corrosion, duplex stainless steel is used widely. The most commonly recognized ASTM grades of duplex steel products that Kalpataru Piping Solutions offers are ASTM A182 F51, ASTM A182 F53, ASTM A182 F55, and ASTM A182 F61; these grades all fall within the ASTM A182 specification. Due to their exceptional resilience to hostile environments, these grades are widely used in industries like desalination, chemical processing, oil and gas, and ships.
Types of Duplex Stainless Steel ASTM Grades
- ASTM A182 F51 (UNS S31803 / S32205)
The original 22% Cr duplex stainless steel, UNS S31803, is equivalent to ASTM A182 F51. UNS S32205 (F60) is the result of producers gradually optimizing its composition to increase pitting corrosion resistance. It is possible to dual-certify this upgraded grade as S31803, but not the other way around. Due to its exceptional strength and resistance to corrosion, F51/F60 makes up almost 80% of the production of duplex stainless steel.
- ASTM A182 F53 (UNS S32750)
UNS S32750, a 25% Cr super duplex stainless steel with better pitting resistance and a greater yield strength than ASTM A182 F51, is comparable to ASTM A182 F53. Often referred to as SAF 2507, this grade is ideal for applications requiring high resistance to corrosion and strong mechanical strength in harsh environments.
- ASTM A182 F55 (UNS S32760)
Another 25% Cr super duplex stainless steel with tungsten added to enhance strength and corrosion resistance is ASTM A182 F55, also referred to as UNS S32760. It was first created as Zeron 100 and is now widely utilized in the chemical, offshore, and shipping sectors where exceptional durability and resilience to adverse environments are essential.
- ASTM A182 F61 (UNS S32550)
UNS S32550, a super duplex stainless steel that was first introduced as Ferralium 255, is equivalent to ASTM A182 F61. In comparison to F53 and F55, it has a higher strength (minimum yield strength of 85 ksi) and contains up to 2.0% copper, which further enhances resistance to pitting corrosion. Applications including chemical processing and highly corrosive conditions, such as saltwater, frequently use this grade.
Contact Us for Duplex Stainless Steel ASTM Grades
Looking for premium ASTM Grades of Duplex Stainless Steel? ASTM A182 F51, F53, F55, and F61 are among the many duplex stainless steel products that Kalpataru Piping Solutions offers. Our materials provide exceptional strength, durability, and corrosion resistance, making them ideal for applications in the oil and gas, aquatic, chemical processing, and desalination industries. Get premium duplex stainless steel items from a reliable manufacturer by raising inquiries regarding the product right away.
FAQs
What is ASTM A182 F51?
The duplex stainless steel ASTM A182 F51 has a high mechanical strength, good weldability, and a strong resistance to general, pitting, stress, and crevice corrosion.
What is the yield of ASTM A182 F51?
The ASTM A182 F51 Flange consists of duplex steel. The mechanical microstructure of the material demonstrates both ferritic and austenitic properties. The material has a minimum yield strength of 450 MPa and a tensile strength of 620 MPa
What is ASTM A182 F53?
UNS S32750 is equivalent to ASTM A182 F53. It offers better resistance to pitting corrosion due to its higher chromium concentration as compared to F51.
What is the difference between ASTM A182 F53 and F55?
ASTM A182 F53 and F55 differ primarily due to their chemical composition. The stainless steel ASTM A182 F53 has a chromium content of 14%, a molybdenum content of 3%, and a nickel content of 2%. In contrast, ASTM A182 F55 is a stainless steel with 3% nickel, 4% molybdenum, and 12% chromium.
What is ASTM A182 F55?
For applications demanding high temperature service, bare forgings or forged and machined products are manufactured using ASTM A182 F55, a forging material specification for 55 grade stainless steel.
