Feb 28 2013
Topics Covered
Introduction
Chemical Composition
Mechanical Properties
Other Designations
Manufacturing Process
Introduction
Grade 205 stainless steel is an austenitic standard grade. It is also referred to as AISI Type 205 Chromium-Manganese-Nickel steel. Grades such as the 205-series provide approximately 30% higher mechanical properties such as yield strength than the traditional 304-series. These grades also provide good formability and ductility.
Grade 205 stainless steel is a widely used precipitation hardening grade steel. It possesses good corrosion resistance, high harness, toughness and strength. In solution annealed condition, it is soft and ductile; however it is capable of high properties with a single precipitation or aging treatment.
The following datasheet provides an overview of grade 205 stainless steel.
Chemical Composition
The chemical composition of grade 205 stainless steel is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
Balance |
|
Chromium, Cr |
16.5-18.0 |
|
Manganese, Mn |
14.0-15.5 |
|
Nickel, Ni |
1.0-1.75 |
|
Silicon, Si |
1 |
|
Nitrogen, N |
0.32-0.40 |
|
Carbon, C |
0.12-0.25 |
|
Phosphorous, P |
0.06 |
|
Sulfur, S |
0.03 |
Mechanical Properties
The mechanical properties of grade 205 stainless steel are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
790 - 830 MPa |
115000 - 120000 psi |
|
Yield strength (@strain 0.200 %) |
450 - 475 MPa |
65300 - 68900 psi |
|
Elastic modulus |
197 GPa |
28572 ksi |
|
Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
|
Elongation at break |
40% |
40% |
|
Hardness, Rockwell B |
100 |
100 |
Other Designations
Equivalent materials to grade 205 stainless steel are SAE 30205 and AISI 205.
Manufacturing Process
The machinability of grade 205 stainless steel produces long, gummy chips. Machining can be performed in the annealed condition. For heat treatment, soak the material at 1038°C (1900°F) for 30 min and cool below 16°C (60°F) for complete martensite transformation. The material can be welded by common fusion and resistance methods; however, it is recommended that this steel should not be joined using oxyacetylene welding method. The recommended filler metal is AWS E/ER630.
Forging can be done by pre-soaking for 1 h at 1177°C (2150°F). Forging below 1010°C (1850°F) should be avoided.