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ASTM 347 - EN 1.4550

ASTM 347 - EN 1.4550

Type 347 is an austenitic chromium stainless steel with high carbon content. Alloy 347, 1.4550 is a stabilized stainless steel which offers superior protection from intergranular corrosion after being exposed to temperatures within the chromium carbide precipitation range of 427-816°C (800-1500°F).

Equivalent grades

• ASTM 347
• DIN 1.4550
• UNS S34700
• X6CrNiNb18-10

Chemical Composition Reference


Physical Property Reference

• Density: 7.9 kg/m³

• Tensile Strength: 595 MPa

• Yield Strength: 200 MPa

• Modulus of Elasticity: 200 GPa

• Thermal 100°C: 16 10-6/°C

• Thermal Conductivity: 15 W/m°C

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

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ASTM 347 - EN 1.4550

Essential details
Core 347/4550 is a niobium stabilized alternative Core 321/4541 with improved intergranular corrosion resistance and good mechanical properties at high temperatures. Core 347/4550 is particularly useful in applications with intermittent heating in the range 400–900 °C/750–1650 °F. Core 347/4550 is an austenitic stainless steel that belongs to the standard CrNi stainless steels. Core 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

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