Mar 4 2013
Topics Covered
Introduction
Chemical Composition
Mechanical Properties
Other Designations
Manufacturing Process
Applications
Introduction
Stainless steel grade 314 has excellent high-temperature resistance characteristics among the chromium-nickel steels series. The silicon content in this material improves oxidation and carburization resistance; however, it can become very brittle when subjected to prolonged temperatures of 649-816°C (1200- 1500°F).
The following datasheet provides an overview of stainless steel grade 314.
Chemical Composition
The chemical composition of grade 314 steel is outlined in the following table.
|
Element |
Content (%) |
|
Iron, fe |
Balance |
|
Chromium, Cr |
23-26 |
|
Nickel, Ni |
19-22 |
|
Manganese, Mn |
2 |
|
Silicon, Si |
1.5-3 |
|
Carbon, C |
0.25 |
|
Sulfur, S |
0.03 |
|
Phosphorous, P |
0.045 |
Mechanical Properties
The mechanical properties of grade 314 stainless steel are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
689 MPa |
99900 psi |
|
Yield strength |
345 MPa |
50000 psi |
|
Modulus of elasticity |
200 GPa |
29000 ksi |
|
Elongation at break (in 50 mm) |
40% |
40% |
|
Hardness, Rockwell B |
85 |
85 |
Other Designations
Equivalent materials to grade 314 stainless steel are given below.
|
AFNOR Z 12 CNS 25.20 |
DIN 1.4841 |
UNI X 16 CrNiSi 25 20 |
UNI X 22 CrNi 25 20 |
JIS SUS Y 31O |
|
B.S. 310 S 24 |
AMS 5522 |
AMS 5652 |
ASTM A276 |
ASTM A314 |
|
ASTM A473 |
ASTM A580 |
SAE 30314 |
SAE J405 (30314) |
|
Manufacturing Process
Stainless steel grade 314 can be heat treated by annealing the material at 1038-1149°C (1900-2100°F), and then quenching in water or rapidly air cooling. Grade 314 steel can be hardened only through cold working. To perform machinability of grade 314, coolant and high-speed turning tools are recommended.
After slowly heating the material to 871°C (1600°F), it should be thoroughly soaked, and then followed by quickly heating to 1093 -1232°C (2000-2250°F) , to perform forging, flanging, or working.
Applications
Grade 314 steel is widely used in the following applications:
-
Radiant tubes
-
Equipment for furnaces
-
Heat treatment components
-
Annealing and carburizing boxes