347 Stainless Steel

Key

Nickel

Copper

Chromium

Aluminum

Molybdenum

Iron

Titanium

Manganese

Cobalt

Other

Nickel (Ni) 11.0
Chromium (Cr) 18.0
Iron (Fe) 69.0
Manganese (Mn) 1.0
Carbon (C) 0.06
Phosphorus (P) 0.03
Sulfur (S) 0.01
Silicon (Si) 0.5
Niobium (Nb) + Tantalum (Ta) 0.5

UNS S34700

347 Stainless fasteners are used in corrosive environments where temperatures may cycle to over 800º F (425º C). Oil refinery applications are common. Other uses for 347 Stainless are in heat sensors and thermocouples.

321 Stainless (UNS S32100/ASTM A193 B8T) is a very close relative. While 347 Stainless is stabilized by the addition of columbium and tantalum to resist intergranular corrosion, 321 is stabilized by the addition of titanium.

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Summary

Environment:
Severe Environments: Hot Concentrated Acids & Chemicals
Temperature Limit:
1500 °F / 816 °C
Ultimate Tensile (Typical):
75 ksi / 515 mpa

Specifications & Technical Data

If your question isn’t answered below, download the technical data sheet here.

Specifications

Bolts: ASTM A193, ASME SA193 B8C
Nuts: ASTM A194 8C, ASME SB 194 8C

Applications

Aircraft Collector Rings
Aircraft Exhaust Stacks
Boiler Casings
Cabin Heaters
Furnace Heating Elements
Heavy Wall-Welded Equipment
Chemical Processing
Gaskets

Physical Properties

Density	288 lb/in³
Melting Range	1398 – 1446°C
Specific Heat Capacity	500 J/kgK
Thermal Conductivity (@100 °C)	16.3 [W/mK]

Mechanical Properties

Yield Strength, Mpa	205
Tensile Strength, Mpa	515
Elongation, %	40
Hardness [Brinell]	201

In-stock

347 Stainless Steel Fasteners

Bolts & Screws

Set Screws

Socket Products

Vented Products

Nuts

Washers

Studs & Rods

U-bolts

Pins & Keys

Fittings

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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.