Sep 21 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther Designations
Introduction
Alloy steels contain elements such as chromium, cobalt, nickel, etc. These steels can be subjected to unique melting and deoxidization processes for specific kind of applications.
Alloy steels comprise a wide range of steels having compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels. In comparison with carbon steels, alloy steels are a lot more responsive to mechanical and heat treatments.
The following datasheet provides an overview of AISI 8630 alloy steel.
Chemical Composition
The chemical composition of AISI 8630 alloy steel is outlined in the following table.
| Element |
Content (%) |
| Iron, Fe |
96.745-98.02 |
| Manganese, Mn |
0.650-0.950 |
| Chromium, Cr |
0.400-0.600 |
| Nickel, Ni |
0.350-0.750 |
| Carbon, C |
0.280-0.330 |
| Silicon, Si |
0.150-0.300 |
| Molybdenum, Mo |
0.150-0.250 |
| Sulfur, S |
≤ 0.0400 |
| Phosphorous, P |
≤ 0.0350 |
Physical Properties
The following table shows the physical properties of AISI 8630 alloy steel.
| Properties |
Metric |
Imperial |
| Density |
7.85 g/cm3 |
0.284 lb/in³ |
Mechanical Properties
The mechanical properties of AISI 8630 alloy steel are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
620 MPa |
89900 psi |
| Yield strength (@strain 0.200%) |
550 MPa |
79800 psi |
| Fatigue strength (unnotched limit) |
315 MPa |
45700 psi |
| Bulk modulus (typical for steel) |
140 GPa |
20300 ksi |
| Shear modulus (estimated from elastic modulus) |
72.0 GPa |
10400 ksi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
16.00% |
16.00% |
| Hardness, Knoop (converted from Vickers hardness) |
230 |
230 |
| Hardness, Rockwell C (converted from Vickers hardness, value below normal HRC range, for comparison only) |
15 |
15 |
| Hardness, Vickers |
217 |
217 |
| Machinability (annealed and cold drawn, based on AISI 1212 steel, as 100 average machinability) |
70 |
70 |
Thermal Properties
The thermal properties of AISI 8630 alloy steel are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@21-100°C/69.8-212°F) |
11.2 µm/m°C |
6.22 µin/in°F |
| Thermal conductivity (typical steel) |
46.6 W/mK |
323 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to AISI 8630 alloy steel are as follows.
| AMS 6280 |
AMS 6281 |
AMS 6530 |
AMS 6535 |
AMS 7496 |
| ASTM A29 |
ASTM A322 |
ASTM A331 |
ASTM A513 |
ASTM A519 |
| ASTM A752 |
ASTM A829 |
MIL S-18728 |
MIL S-6050 |
SAE J1397 |
| SAE J404 |
SAE J404 |
SAE J412 |
AMS 6280E |
AMS 6281C |
| AMS 6355 |
AMS 6355G |
AMS 6530E |
AMS 6550 |
AMS 6550E |
| ASTM A505 |
MIL SPEC MIL-S-16974 |
SAE J770 |
|
|
|
|
|
|
|