Sep 26 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Stainless steels are high-alloy steels that have excellent corrosion
resistance in comparison with other steels as they contain more
chromium.
Based on their crystalline structure, stainless steels are divided
into three groups, namely, martensitic, austenitic and ferritic steels.
A combination of martensitic and ferritic steels forms a fourth group
known as precipitation-hardened steels.
The following datasheet provides an overview of grade 444 stainless
steel.
Chemical Composition
The chemical composition of grade 444 stainless steel is outlined in
the following table.
| Element |
Content
(%) |
| Iron, Fe |
77.475 |
| Chromium, Cr |
18.5 |
| Molybdenum, Mo |
2 |
| Nickel, Ni |
1 |
| Manganese, Mn |
1 |
| Silicon, Si |
1 |
| Carbon, C |
0.025 |
Physical Properties
The following table shows the physical properties of grade 444
stainless steel.
| Properties |
Metric |
Imperial |
| Density |
7.80 g/cm3 |
0.282 lb/in³ |
Mechanical Properties
The mechanical properties of grade 444 stainless steel are displayed
in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
415 MPa |
60200 psi |
| Yield strength (@strain 0.200%) |
275 MPa |
39900 psi |
| Elastic modulus |
200 GPa |
29000 ksi |
| Shear modulus |
80-83 GPa |
11600-12000 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break |
20% |
20% |
| Hardness, Rockwell B |
95 |
95 |
Thermal Properties
The thermal properties of grade 444 stainless steel are given in the
following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient |
10 µm/m°C |
5.56 µin/in°F |
| Thermal conductivity |
26.8 W/mK |
186 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to grade 444 stainless steel are: