EN 1.4550, ASTM TYPE 347H / UNS S34709 Stainless Steel

EN 1.4550, ASTM TYPE 347H / UNS S34709 Stainless Steel

EN 1.4550, ASTM TYPE 347H / UNS S34709 Stainless Steel General Characteristics 347/4550 is a niobium stabilized alternative 321/4541 with improved intergranular corrosion resistance and good mechanical properties at high temperatures. 347/4550 is particularly useful in applications with...
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EN 1.4550, ASTM TYPE 347H / UNS S34709 Stainless Steel

General Characteristics

347/4550 is a niobium stabilized alternative 321/4541 with improved intergranular corrosion resistance and good mechanical properties at high temperatures. 347/4550 is particularly useful in applications with intermittent heating in the range 400–900 °C/750–1650 °F. 347/4550 is an austenitic stainless steel that belongs to the standard CrNi stainless steels. 347/4550 can be welded in all dimensions without becoming susceptible to intergranular corrosion.


The austenitic CrNi standard grades are the most widely used group of stainless steels. Their well-balanced material properties make them suitable for the fabrication of many products.


Typical Applications

High temperature gaskets

Rocket engine parts

Expansion joints

Aircraft collector rings

Exhaust manifolds

Chemical production equipment

Flanges and valves


Product forms, available sizes and finishes

Flat

Product type

Finishes

ThicknessWidth

Black hot band

1U

2,70-10,00

1000-1550

Cold rolled coil

2B, 2BB, 2C, 2D, 2E, 2G, 2H, 2J, 2R

0,05-4,00

3-1600

Cold rolled sheet

2B, 2BB, 2D, 2E, 2G, 2H, 2J, 2R

0,25-4,00

350-1250

Hot rolled coil, pickled

1C, 1D, 1G, 1U

2,00-10,00

50-1550

Precision strip

2H, 2R

0,05-1,50

3-649

Quarto plate

1D

5,00-130,00

400-3200


Long

Product type
ThicknessWidth

Cast billet


127,00-180,00

127-180

Cold drawn bar hex


8,00-25,40

8-25

Cold drawn bar round


6,00-25,40

6-25

Cold drawn bar square


8,00-22,00

8-22

Forged billet round


200,00-230,00

200-230

Forged billet square


200,00-230,00

200-230

Hot rolled / Black bar round


75,00-230,00

75-230

Peeled / turned bar round


70,00-170,00

70-170

Rolled billet round


90,00-200,00

90-200

Rolled billet square


75,00-200,00

75-200

Wire rod (Rod coil) hex


9,00-27,00

9-27

Wire rod (Rod coil) round


5,00-27,00

5-27

Wire rod (Rod coil) square


9,00-24,00

9-24


Chemical Composition

The chemical composition may vary slightly between different product standards. The required standard will be fully met as specified on the order.


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


The chemical composition is given as % by mass.


CMnCrNiMo
Typical

0.05


17.5

9.5


ASME II A SA-240

≤0.08

≤2.00

17.0-19.0

9.0-13.0


ASME II A SA-240

0.04-0.10

≤2.00

17.0-19.0

9.0-13.0


ASTM A240

≤0.08

≤2.00

17.0-19.0

9.0-13.0


ASTM A240

0.04-0.10

≤2.00

17.0-19.0

9.0-13.0


EN 10028-7

≤0.08

≤2.00

17.00-19.00

9.00-12.00


EN 10088-2

≤0.08

≤2.0

17.0-19.0

9.0-12.0


EN 10088-3

≤0.08

≤2.0

17.0-19.0

9.0-12.0


IS 6911

≤0.08

≤2.00

17.0-19.0

9.0-13.0

≤0.70

IS 6911

0.04-0.10

≤2.00

17.0-19.0

9.0-13.0

≤0.70


Mechanical Properties

StandardRp0.2Rp1.0RmElongationRockwellHB

MPa

MPa

MPa

%



Product type: Cold rolled coil and sheet

Typical (thickness 1 mm)

275

300

620



82

ASME II A SA-240

≥ 205


≥ 515



≤ 201

ASME II A SA-240

≥ 205


≥ 515



≤ 201

ASTM A240

≥ 205


≥ 515



≤ 201

ASTM A240

≥ 205


≥ 515


≤ 92HRB

≤ 201

IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

Product type: Hot rolled coil and sheet

Typical (thickness 4 mm)

320

365

640

53



ASME II A SA-240

≥ 205


≥ 515



≤ 201

ASME II A SA-240

≥ 205


≥ 515



≤ 201

ASTM A240

≥ 205


≥ 515



≤ 201

ASTM A240

≥ 205


≥ 515



≤ 201

IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

Product type: Hot rolled quarto plate

Typical (thickness 15 mm)

260

290

595

45



ASME II A SA-240

≥ 205


≥ 515


≤ 92HRB

≤ 201

ASME II A SA-240

≥ 205


≥ 515


≤ 92HRB

≤ 201

ASTM A240

≥ 205


≥ 515


≤ 92HRB

≤ 201

ASTM A240

≥ 205


≥ 515


≤ 92HRB

≤ 201

EN 10028-7

≥ 200

≥ 240

500-700

≥ 40



EN 10088-2

≥ 200

≥ 240

500-700

≥ 40



IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

IS 6911

≥ 205


≥ 515


≤ 92HRB

≤ 201

Product type: Wire rod

Typical

250

280

580

45




Physical Properties (Data according to EN 10088)

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

kg/dm3

GPa

10-6/°C

W/m°C

J/kg°C

µΩm


7,9

200

16,0

15

500

0,73

No


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