Sep 26 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Cold Working
Welding
Forming
Machinability
Heat Treatment
Hot Working
Applications
Introduction
Stainless steels are known as high-alloy steels with good corrosion
resistance thanks to the large amounts of chromium available in these
steels. Most of the stainless steels contain about 10% of chromium.
Stainless steels are available in three different groups based on
their crystalline structure. These groups include martensitic,
austenitic and ferritic. The combination of martensitic and ferritic
steels forms a fourth group of stainless steels known as
precipitation-hardened steels.
Stainless steel-grade 15-5 is a precipitation hardening,
martensitic, chromium-nickel-copper stainless steel. This steel has
transverse toughness and ductility, hardness capability, good strength
and corrosion resistance.
The following datasheet provides an overview of stainless
steel-grade 15-5.
Chemical Composition
The chemical composition of stainless steel-grade 15-5 is outlined
in the following table.
| Element |
Content
(%) |
| Iron, Fe |
75 |
| Chromium, Cr |
14.8 |
| Nickel, Ni |
4.5 |
| Copper, Cu |
3.5 |
| Silicon, Si |
1.0 |
| Manganese, Mn |
1.0 |
| Nb + Ta |
0.3 |
| Carbon, C |
0.070 |
| Phosphorous, P |
0.040 |
| Sulfur, S |
0.030 |
Physical Properties
The following table shows the physical properties of stainless
steel-grade 15-5.
| Properties |
Metric |
Imperial |
| Density |
7.80 g/cm3 |
0.282 lb/in³ |
Mechanical Properties
The mechanical properties of stainless steel-grade 15-5 are
displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
1380 MPa |
200000 psi |
| Yield strength (@strain 0.200 %) |
1275 MPa |
184900 psi |
| Elastic modulus |
196 GPa |
28427 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
10.00% |
10.00% |
| Charpy impact |
10.0 J |
7.38 ft-lb |
| Hardness, Brinell |
420 |
420 |
| Hardness, Knoop (converted from
Brinell hardness) |
451 |
451 |
| Hardness, Rockwell B (converted
from Brinell hardness) |
104 |
104 |
| Hardness, Rockwell C (converted
from Brinell hardness) |
44.2 |
44.2 |
| Hardness, Vickers (converted from
Brinell hardness) |
445 |
445 |
Thermal Properties
The thermal properties of stainless steel-grade 15-5 are given in
the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient
(@-73.0-21.0°C/-99.4-69.8°F) |
10.4 µm/m°C |
5.78 µin/in°F |
| Thermal conductivity (@150°C/302°F) |
17.8 W/mK |
124 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to stainless steel-grade 15-5 are:
- AMS 5659
- AMS 5826
- AMS 5862
- ASTM A564 (XM-12)
- ASTM A693 (XM-12)
- ASTM A705 (XM-12)
Fabrication and Heat Treatment
Annealing
Stainless steel-grade 15-5 is annealed at 1038°C (1900°F) for 1 h
followed by rapid cooling.
Cold Working
Stainless steel-grade 15-5 is not suitable for cold working though
it can be formed in a moderate manner.
Welding
Stainless steel-grade 15-5 is welded by shielded fusion or
resistance methods and AWS E/ER630 is the filler metal used for this
process.
Forming
Stainless steel-grade 15-5 is capable of being formed only in a mild
manner. Best results can be obtained when this alloy is formed in the
overaged condition.
Machinability
Stainless steel-grade 15-5 can be machined in all attainable
conditions and machining in H1150M is recommended for this alloy to
obtain best tool life.
Heat Treatment
Stainless steel-grade 15-5 can be heat treated in the following
conditions:
- CONDITION A: Soak the material for 0.5 h at 1038°C (1900°F) and
then cool the material in air.
- CONDITION H 900: The Condition A material is soaked for 1 h at
482°C (900°F) and cooled in air.
- CONDITION H 925, H 1025, H1075, H 1100, H 1150: Soak Condition A
material for 4 h at desired temperature and air cool.
- CONDITION H 1150M: Soak Condition A material for 2 h at 760°C
(1400°F) and air cool. This material is also heated for 4 h to 621°C
(1150°F) and finally cooled in air.
Hot Working
All common hot working methods can be used for hot working stainless
steel-grade 15-5. After being hot worked, the material is annealed to
obtain good heat treat response.
Applications
Stainless steel-grade 15-5 is used in fabricated parts in high
pressure corrosive environments including gears, valves, fittings,
fasteners and shafts and in aircraft components.