Duplex & Super Duplex stainless steels get their name from their two phase microstructure, which is composed of grains of stainless steel that are 50% austenitic and 50% ferritic. This type of steel offers a number of advantages and is frequently preferred over standard ferritic or austenitic stainless steels due to its increased strength - it is approximately twice as strong as these metals. Due to the increased yield strength of duplex stainless steels, thinner sections can be created, resulting in significant weight savings.

UNS S32750 F-53

Super Duplex UNS S32750 is the most common super duplex grade in the market. UN S32750 is a duplex stainless steel especially designed for service in aggressive chio-ride-containing environments. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength. It is widely used in oil & gas, hydropower, pressure vessels, pulp & paper, structural components and chemical tankers.

UNS S32760 can be used in a variety of applications including:

  • Desalination plants

  • Seawater systems

  • Heat exchangers

  • Subsea pipework systems

  • Flue gas desulphurisation (FGD) plants

  • Centrifuges and agitators

  • Valves and pumps

  • Storage tanks and pressure vessels

Specifications

  • UNS Number: S32760
  • Werkstoff Number: 1.4501
  • Standards: ASTM A182, A240, A276, A314, A473, A479, A815, A790, A928.
  • Other: F55

Uns S32760 F-55

Super Duplex UNS S32760 is among the most common super duplex grade in the market. UNS S32760 is a duplex stainless steel especially designed for service in aggr sive chloride-containing environments and has additions of W and Cu compared to UNS S32750. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength.

UNS S32760 can be used in a variety of applications including:

  • Desalination plants

  • Seawater systems

  • Heat exchangers

  • Subsea pipework systems

  • Flue gas desulphurisation (FGD) plants

  • Centrifuges and agitators

  • Valves and pumps

  • Storage tanks and pressure vessels

  • UNS: S32760
  • Werkstoff Number: 1.4501
  • Standards:ASTM A182, A240, A276, A314, A473, A479, A815, A790, A928.
  • Other: F55

UNS S32550 - FERRALIUM 255 - F61

FERRALIUM 255 is finding many cost effective applications in the chemical, marine, met-allurgical, municipal sanitation, plastics, oil and gas, petrochemical, pollution control, wet phosphoric acid, paper making and metalworking industries. Called "super" because it is more alloyed than ordinary stainless steels and has superior corrosion resis-tance, FERRALIUM 255 is being used in areas where conventional stainless' are inadequate or, at best marginal. One good example s in the paper industry which was hit with c1 epidemic of corrosion problems when environmental laws forced recycling of process liquids In closed systems, chemicals such as chlorides can build up to highly 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.

UNS S31803/2205 can be used in a variety of applications including:

  • Seawater systems

  • Seawater pumps and valves

  • Chemical process vessels, piping, and heat exchangers

  • FGD scrubber systems

  • Pulp mill digesters, bleach washers

  • Food process equipment

  • Oil field piping

UNS S31803 - F51 | UNS S32205 - F60

Duplex UNS S31803/ S32205 are the most common duplex grades in the market. They have very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength. They are widely used in oil & gas, hydro power, pressure vessels, pulp & paper, structural components and chemical tankers. The alloys are not intended to be used at temperatures above 300°C due to embrittlement.

UNS S31803/2205 can be used in a variety of applications including:

  • Seawater systems

  • Seawater pumps and valves

  • Chemical process vessels, piping, and heat exchangers

  • FGD scrubber systems

  • Pulp mill digesters, bleach washers

  • Food process equipment

  • Oil field piping

JNS S31254 - SMO 254 - F44

The 6Mo super austenitic steel combines moderate tensile strength and high ducti vith excellent corrosion resistance in seawater and variety of industrial environmer ypically the alloy has PREN of 42 - 44, which ensure that the resistance to pitting c sion is high and it also has a hight resistance to crevice corrosion.

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