EN 1.4833, ASTM TYPE 309S / UNS S30908 Stainless Steel

EN 1.4833, ASTM TYPE 309S / UNS S30908 Stainless Steel

EN 1.4833, ASTM TYPE 309S / UNS S30908 Stainless Steel General Characteristics Austenitic grade with improved oxidation resistance. Commonly used for furnace equipment, annealing boxes, thermo wells, baffle plates and salt pots. A common feature of GNEE high temperature steels is that they are...
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EN 1.4833, ASTM TYPE 309S / UNS S30908 Stainless Steel

General Characteristics

Austenitic grade with improved oxidation resistance. Commonly used for furnace equipment, annealing boxes, thermo wells, baffle plates and salt pots.


A common feature of GNEE high temperature steels is that they are designed primarily for use at temperatures exceeding ~550 °C, i.e. in the temperature range where creep strength as a rule is the dimensioning factor and where HT corrosion occurs. Optimising steels for high temperatures has meant that their resistance to aqueous corrosion has been limited. All steels are austenitic, resulting in relatively high creep strength values.


Typical Applications

GNEE high temperature steels can be and have been used in a number of applications where the temperature exceeds 550°C, e.g. for equipment and components within:

  • Furnace equipment

  • Annealing boxes

  • Thermo wells

  • Baffle plates and salt pots

  • Iron, steel, and non-ferrous industries

  • Engineering industry

  • Energy conversion plants

  • Cement industry


Chemical Composition

Typical chemical composition is given in the table below. The chemical composition is given as % by weight.



CMnCrNiMoN

Typical

0.06


22.3

12.3



ASME II A SA-240

≤0.08

≤2.00

22.0-24.0

12.0-15.0



ASTM A240

0.04-0.10

≤2.00

22.0-24.0

12.0-15.0



ASTM A240

≤0.08

≤2.00

22.0-24.0

12.0-15.0



EN 10095

≤0.15

≤2.00

22.00-24.00

12.00-14.00


≤0.11

IS 6911

≤0.20

≤2.00

22.0-25.0

11.0-15.0

≤0.70


IS 6911

≤0.08

≤2.00

22.0-24.0

12.0-15.0

≤0.70



Mechanical Properties

Whilst GNEE high temperature steels are mainly optimised for oxidation and high temperature corrosion resistance, they also have good mechanical properties, partly due to their austenitic structure and partly due to certain alloying elements.


Design values are usually based on minimum proof strength values for constructions used at temperatures up to around 550°C. For higher temperatures, mean creep strength values are used.


Standard

Rp0.2Rp1.0RmElongationRockwellHB

MPa

MPa

MPa

%



Product type: Cold rolled coil and sheet

Typical (thickness 1 mm)

280

320

600




ASME II A SA-240

≥ 205


≥ 515



≤ 217

ASTM A240

≥ 205


≥ 515



≤ 217

ASTM A240

≥ 205


≥ 515


≤ 95HRB

≤ 217

EN 10095

≥ 210

≥ 250

500-700

≥ 35



IS 6911

≥ 210


≥ 490


≤ 95HRB

≤ 217

IS 6911

≥ 205


≥ 515


≤ 95HRB

≤ 217

Product type: Hot rolled coil and sheet

Typical (thickness 4 mm)

330

380

610

48


85

ASME II A SA-240

≥ 205


≥ 515



≤ 217

ASTM A240

≥ 205


≥ 515



≤ 217

ASTM A240

≥ 205


≥ 515



≤ 217

EN 10095

≥ 210

≥ 250

500-700

≥ 35



IS 6911

≥ 210


≥ 490


≤ 95HRB

≤ 217

IS 6911

≥ 205


≥ 515


≤ 95HRB

≤ 217

Product type: Hot rolled quarto plate

Typical (thickness 15 mm)

300

340

620

50



ASME II A SA-240

≥ 205


≥ 515


≤ 95HRB

≤ 217

ASTM A240

≥ 205


≥ 515


≤ 95HRB

≤ 217

ASTM A240

≥ 205


≥ 515


≤ 95HRB

≤ 217

EN 10095

≥ 210

≥ 250

500-700

≥ 35



IS 6911

≥ 210


≥ 490


≤ 95HRB

≤ 217

IS 6911

≥ 205


≥ 515


≤ 95HRB

≤ 217

Product type: Wire rod

Typical

300

340

620

50




Physical Properties

Data according to EN 10088

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivity

kg/dm3

GPa

10-6/°C

W/m°C

7.9

196

16,0

15


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