EN 1.4662, ASTM UNS S82441 Stainless Steel

EN 1.4662, ASTM UNS S82441 Stainless Steel

EN 1.4662, ASTM UNS S82441 Stainless Steel General Characteristics Austenitic-ferritic stainless steel also referred to as duplex stainless steels, combine many of the beneficial properties of ferritic and austenitic steels. Due to the high content of chromium and nitrogen, and often also...
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EN 1.4662, ASTM UNS S82441 Stainless Steel

General Characteristics

Austenitic-ferritic stainless steel also referred to as duplex stainless steels, combine many of the beneficial properties of ferritic and austenitic steels. Due to the high content of chromium and nitrogen, and often also molybdenum, these steels offer good resistance to localised and uniform corrosion. 


The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking. Duplex steels have good weldability. All duplex grades have the maximum service temperature restricted to 250 or 325°C according to EN10028-7 or ASME II-D 2007 respectively.


Typical Applications

  • Pulp and paper industry

  • Desalination plants

  • Cargo tanks and pipe systems in chemical tankers

  • Firewalls and blast walls on offshore platforms

  • Components for structural design

  • Boilers and water heaters

  • Storage tanks

  • Pressure vessels

  • Water heaters

  • Heat exchangers

  • Rotors, impellers and shafts

  • Bridges

  • Flue-gas cleaning


Chemical Composition

The typical chemical composition for this grade is given in the table below, together with composition limits given for this grade according to different standards. The required standard will be fully met as specified on the order.


CMnCrNiMoNOther

Typical

0.02

3.0

24.0

3.6

1.6

0.27

Cu:0.40

AM 641

≤0.030

2.5-4.0

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

ASME II A SA-240

≤0.030

2.5-4.0

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

ASTM A240

≤0.030

2.5-4.0

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

EN 10028-7

≤0.030

2.50-4.00

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

EN 10088-2

≤0.030

2.50-4.00

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

EN 10088-3

≤0.030

2.50-4.00

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80

IS 6911

≤0.030

2.50-4.00

23.0-25.0

3.0-4.5

1.00-2.00

0.20-0.30

Cu:0.10-0.80


Mechanical Properties

The duplex stainless steels have much higher mechanical strength compared to standard stainless steels. If the high strength of the duplex grades can be utilised, down gauging can be done in many applications leading to cost efficient solutions. The allowable design values may vary between product forms.

The product types P= hot rolled plate, H=hot rolled strip and C=cold rolled coil and strip.


StandardRp0.2Rp1.0RmElongationRockwellHB

MPa

MPa

MPa

%



Product type: Cold rolled coil and sheet

Typical (thickness 1 mm)

640


850

30



AM 641

≥ 550


750-900

≥ 25


≤ 290

ASME II A SA-240

≥ 540


≥ 740



≤ 290

ASTM A240

≥ 480


≥ 680


≤ 31HRC

≤ 290

EN 10028-7

≥ 550


750-900

≥ 25



EN 10088-2

≥ 550


750-900

≥ 25



IS 6911

≥ 540


≥ 740


≤ 31HRC

≤ 290

Product type: Hot rolled coil and sheet

Typical (thickness 4 mm)

645

720

825

30


250

AM 641

≥ 550


750-900

≥ 25


≤ 290

ASTM A240

≥ 540


≥ 740



≤ 290

EN 10028-7

≥ 550


750-900

≥ 25



EN 10088-2

≥ 550


750-900

≥ 25



IS 6911

≥ 480


≥ 680


≤ 31HRC

≤ 290

Product type: Hot rolled quarto plate

Typical (thickness 15 mm)

520


750

33


230

AM 641

≥ 480


680-900

≥ 25



ASME II A SA-240

≥ 480


≥ 680



≤ 290

ASTM A240

≥ 480


≥ 680



≤ 290

EN 10028-7

≥ 480


680-900

≥ 25



EN 10088-2

≥ 480


680-900

≥ 25



IS 6911

≥ 480


≥ 680


≤ 31HRC

≤ 290


Physical Properties

The physical properties at room temperature are shown in the table below. Data according to EN10088 or EN10095.

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivityThermal capacityElectrical resistanceMagnetizable

kg/dm3

GPa

10-6/°C

W/m°C

J/kg°C

µΩm


7.7

205

13.0

14.5

500

0.80

Yes


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