Sep 26 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Stainless steels are known as high-alloy steels. They consist about
4-30% of chromium. They are classified into martensitic, austenitic,
and ferritic steels based on their crystalline structure.
Grade 317 stainless steel is a modified version of 316 stainless
steel. It has high strength and corrosion resistance. The following
datasheet gives more details about grade 317 stainless steel.
Chemical Composition
The chemical composition of grade 317 stainless steel is outlined in
the following table.
| Element |
Content
(%) |
| Iron, Fe |
61 |
| Chromium, Cr |
19 |
| Nickel, Ni |
13 |
| Molybdenum, Mo |
3.50 |
| Manganese, Mn |
2 |
| Silicon, Si |
1 |
| Carbon, C |
0.080 |
| Phosphorous, P |
0.045 |
| Sulfur, S |
0.030 |
Physical Properties
The following table shows the physical properties of grade 317
stainless steel.
| Properties |
Metric |
Imperial |
| Density |
8 g/cm3 |
0.289 lb/in³ |
| Melting point |
1370°C |
2550°F |
Mechanical Properties
The mechanical properties of annealed grade 317 stainless steel are
displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
620 MPa |
89900 psi |
| Yield strength |
275 MPa |
39900 psi |
| Elastic modulus |
193 GPa |
27993 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
45% |
45% |
| Hardness, Rockwell B |
85 |
85 |
Thermal Properties
The thermal properties of grade 317 stainless steel are given in the
following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@
0-100°C/32-212°F) |
16 µm/m°C |
8.89 µin/in°F |
| Thermal conductivity (@ 100°C/212°F) |
16.3 W/mK |
113 BTU in/hr.ft².°F |
Other Designations
Other designations equivalent to grade 317 stainless steel are
included in the following table.
| ASTM A167 |
ASTM A276 |
ASTM A478 |
ASTM A814 |
ASME SA403 |
| ASTM A182 |
ASTM A312 |
ASTM A511 |
QQ S763 |
ASME SA409 |
| ASTM A213 |
ASTM A314 |
ASTM A554 |
DIN 1.4449 |
MIL-S-862 |
| ASTM A240 |
ASTM A403 |
ASTM A580 |
ASME SA240 |
SAE 30317 |
| ASTM A249 |
ASTM A409 |
ASTM A632 |
ASME SA249 |
SAE J405 (30317) |
| ASTM A269 |
ASTM A473 |
ASTM A813 |
ASME SA312 |
Fabrication and Heat Treatment
Machinability
Grade 317 stainless steel is tougher than 304 stainless steel. It is
recommended to use chip breakers. Hardenability of this alloy will be
reduced if constant feeds and low speeds are used.
Welding
Grade 317 stainless steel can be welded using fusion and resistance
methods. Oxyacetylene welding method is not preferred for this alloy.
AWS E/ER317 or 317L filler metal can be used to obtain good result.
Hot Working
Grade 317 stainless steel can be hot worked using all common hot
working procedures. It is heated at 1149-1260°C (2100-2300°F). It
should not be heated below 927°C (1700°F). Post-work annealing can be
done to retain the corrosion resistance property.
Cold Working
Stamping, shearing, drawing, and heading can be done successfully.
Post-work annealing is performed in order to reduce internal stress.
Annealing
Grade 317 stainless steel is annealed at 1010-1121°C (1850-2050°F)
followed by cooling.
Hardening
Grade 317 stainless steel does not react to heat treatment. It can
be hardened by cold working.
Applications
Grade 317 stainless steel is used in the following applications:
- Pulping paper
- Textile
- Chemical equipment