Jun 19 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Stainless steel grade 334 is a titanium and aluminum based austenitic stainless steel. This alloy provides better temperature scaling resistance than chromium-nickel stainless steels such as grade 304. It also has good oxidation resistance of up to 1038°C (1900°F). Grade 334 is commonly used as a sheathing material.
The following sections will discuss in detail about stainless steel grade 334.
Chemical Composition
The chemical composition of stainless steel grade 334 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
19-20 |
|
Chromium, Cr |
19-19.5 |
|
Manganese, Mn |
1 |
|
Silicon, Si |
0.75 |
|
Phosphorus, P |
0.02 |
|
Sulfur, S |
0.015 |
|
Titanium, Ti |
0.4 |
|
Aluminum, Al |
0.4 |
|
Copper, Cu |
0.2 |
|
Carbon, C |
0.03 |
|
Iron, Fe |
Balance |
Physical Properties
The physical properties of stainless steel grade 334 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.03 g/cm3 |
0.290 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of stainless steel grade 334.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
572.4 MPa |
83020 psi |
|
Yield strength |
241.4 MPa |
35010 psi |
|
Modulus of elasticity |
200 GPa |
29000 ksi |
|
Elongation at break |
40% |
40% |
|
Hardness, Rockwell B |
82 |
82 |
Thermal Properties
The thermal properties of stainless steel grade 334 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
17.04 µm/m°C |
9.467 µin/in°F |
|
Thermal conductivity |
12.9 W/mK |
89.5 BTU in/hr.ft².°F |
Applications
Stainless steel grade 334 can be applied in these areas:
-
Automotive exhaust systems
-
Sheathing material for heating elements
-
Emission control systems
-
In applications where resistance to high temperature degradation is essential