347 Stainless Steel Alloy

UNS: S34700
EN-DIN: 1.4550

Printable PDF: 347 Stainless Steel Alloy Data Sheet

347 alloys are stabilized stainless steels which offer as their main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C).  347 alloys are stabilized by the addition of columbium.

Nominal Composition

C:	0.08 max
Mn:	2.0 max
P:	0.045 max
S:	0.030 max
Si:	1.00 max
Cr:	17.0 – 19.0
Ni:	9.0 – 12.0
Nb (Cb):	10xC – 1.00
N:	0.10 max
Fe:	BAL

Physical Properties
At 70°F (At 20°C)      

Density
0.288 lb./in³ / (7.96 g/cm³)

Modulus of Elasticity (E)
28.0 x 10³ ksi / (193 x 10³MPa)

Coefficient of Expansion
9.2 x 10-6 microinches/in.-°F (70-600°F) / (16.6 μm/m-°C) (20-300°C)

Electrical Resistivity
28.4 μ ohm.in / (72 μ ohm.cm)

Thermal Conductivity
9.5 Btu-in./ft.²hr.-°F / (16.3 W/m-K)

Applicable Specifications

AMS 5512, ASTM A269, ASTM A240, ASTM A479, AMS 5680

Typical Mechanical Properties – Typical Room Temperature Mechanical Properties

Typical mechanical properties are based on ATI source, ASTM A240

Condition
Annealed

Tensile Strength (UTS)
93 ksi (640 MPa)

0.2% YS
37 ksi (250 MPa)

Elongation% in 2”  (50.8 mm)
45%

Hardness Rockwell
84 HRBW 

Additional Information on 347 Stainless Steel – Getting the Right Steel for Your Needs

There are many different types of steel. It is imperative that you use the right one for your needs. Here at Elgiloy Specialty Metals Hampshire Mill, we understand this. That is why we communicate with each of our customers in enough detail to ensure that they get the right steel. Stainless steel 347 may be the one for you.

Type 347 stainless steel is typically used in the aviation industry, including constructing airplane exhaust stacks and parts for jet engines. Besides the aviation industry, stainless steel 347 can be used to make common parts such as tubing, collector rings, fasteners, and flexible metal hoses.

What is Special About Stainless Steel 347?

Stainless steel 347 is stabilized austenitic, Columbium-Tantalum-Chromium-Nickel steel. The Columbian and Tantalum work together to prevent any Chromium carbide being formed.

347 stainless steel is a non-magnetic and it is particularly good in two scenarios. One, it performs well when used for any parts that require welding but cannot go through the annealing process. And secondly, it comes into its own when used for any part that is utilized in temperatures ranging from 800 up to 1600 degrees Fahrenheit.

Properties and Forms of 347 Stainless Steel

You can find stainless steel 347 in a wide variety of forms. It comes in three types of the coil form – strip, ribbon, and foil. It also comes in four types of the wire form – square, round, profile, and flat.

347 stainless steel has nine notable properties. They are .08% Carbon, .045% Phosphorus, .030% Sulfur, 2% Magnesium, about 18% Chromium, about 11% Nickel, and .75% Silicon.

The Columbium/Tantalum mix is 10Xc up to 1 percent, and there is also Iron to balance out the properties and help make this stainless steel effective.

Minimum tensile strength is about 75 KSI and the steel has a yield strength of at least 30 KSI. Elongation is at least 40%.

Hardness is at a maximum of RB 92. This type of stainless steel can only be hardened by cold working. Stainless steel 347 can be welded effectively in one of two ways: the resistance method or common fusion.

Our Promise to You

Here at ESM, a Stainless Steel Precision Rolled Products Division, we want to be your one-stop shop for all of your stainless steel precision rolled products and stainless steel finishes.

We will work closely with you to determine the best stainless steel for your chosen application. We also work with stainless steel 302, stainless steel 305, and stainless steel 409. Know that we pride ourselves in providing our customers with top notch customer service. We do this by listening to your needs and understanding them fully. You are at the center of our business and we strive to get you the material you need, when you need it, every time.

We constantly innovate our processes so we can keep exceeding expectations, from the quality of our materials to the effectiveness of our customer service.

Quality is of the utmost importance to us. And having satisfied customers keeps our business going. So you can rest assured that we will do our utmost to give you the best experience possible.

You can request a free quote with no obligations. Call us directly at 800-323-0758 or email us at hampinfo@elgiloy.com to learn more about stainless steel 347, or any of our other products.

 

**The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for general information only.  Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications. Data was obtained from our melt sources with data referring to mechanical properties and chemical analyses are the result of tests performed on specimens obtained from specific locations with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations.  Further information should be sought from the melt sources.