Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Forming Welding Heat Treatment Forging Hot Working Cold Working Annealing HardeningApplications
Introduction
Carbon steels are those that have carbon as the main alloying element. They also contain up to 0.4% silicon and 1.2% manganese. In addition, the residual elements such as copper, molybdenum, aluminium, chromium and nickel are present in these steels.
The AISI 1030 steel is a high carbon steel, and has moderate strength and hardness in the as-rolled condition. It can be hardened and strengthened by cold work. It also has fair machinability, ductility and good weldability.
The following sections will discuss in detail about AISI 1030 carbon steel.
Chemical Composition
The chemical composition of AISI 1030 carbon steel is outlined in the following table.
| Element |
Content (%) |
| Iron, Fe |
98.67-99.13 |
| Manganese, Mn |
0.60-0.90 |
| Carbon, C |
0.270-0.340 |
| Phosphorous, P |
≤ 0.040 |
| Sulfur, S |
≤ 0.050 |
Physical Properties
The physical properties of AISI 1030 carbon steel are tabulated below.
| Properties |
Metric |
Imperial |
| Density |
7.85 g/cc |
0.284 lb/in3 |
| Melting point |
1510°C |
2750°F |
Mechanical Properties
The following table shows mechanical properties of the cold drawn AISI 1030 carbon steel.
| Properties |
Metric |
Imperial |
| Tensile strength, ultimate |
525 MPa |
76100 psi |
| Tensile strength, yield |
440 MPa |
63800 psi |
| Modulus of elasticity |
190-210 GPa |
29700-30458 ksi |
| Bulk modulus (typical for steel) |
140 GPa |
20300 ksi |
| Shear modulus (typical for steel) |
80 GPa |
11600 ksi |
| Poissons ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
12% |
12% |
| Reduction of area |
35% |
35% |
| Hardness, Brinell |
149 |
149 |
| Hardness, Knoop (converted from Brinell hardness) |
169 |
169 |
| Hardness, Rockwell B (converted from Brinell hardness) |
80 |
80 |
| Hardness, Vickers (converted from Brinell hardness) |
155 |
155 |
| Machinability (based on AISI 1212 steel. as 100 machinability) |
70 |
70 |
Thermal Properties
The thermal properties of AISI 1030 carbon steel are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@15-75°C/59-167°F) |
11.7 µm/m°C |
6.50 µin/in°F |
| Thermal Conductivity |
51.9 W/mK |
360 BTU in/hr.ft2.°F |
Other Designations
Other designations that are equivalent to AISI 1030 carbon steel include the following:
| ASTM A29 (1030) |
ASTM A546 (1030) |
SAE J403 (1030) |
| ASTM A510 (1030) |
ASTM A576 (1030) |
SAE J412 (1030) |
| ASTM A512 (1030) |
ASTM A682 (1030) |
DIN 1.1172 |
| ASTM A513 (1030) |
ASTM A830 |
UNI CB 35 |
| ASTM A519 (1030) |
MIL S-11310 (CS 1030) |
ASTM A108 |
| ASTM A544 (1030) |
FED QQ-S-700(C1030) |
FED QQ-S-635 |
| ASTM A545 (1030) |
SAE J1397 (1030) |
|
Fabrication and Heat Treatment
Machinability
The machinability rating of AISI 1030 carbon steel is 70.
Forming
The formability of AISI 1030 carbon steel in the annealed condition is good.
Welding
AISI 1030 carbon steel can be welded by all welding methods. It is advisable to pre-heat the heavy sections of this steel at 149 to 260°C (300 to 500°F) and then post-heat at 593 to 649°C (1100 to 1200°F) for welding.
Heat Treatment
AISI 1030 carbon steel is heat treated at 816 to 871°C (1500 to 1600°F) and quenched in water. This process is followed by a tempering treatment.
Forging
AISI 1030 carbon steel is forged at 982 to 1260°C (1800 to 2300°F).
Hot Working
Hot working of AISI 1030 carbon steel is performed at 93 to 482°C (200 to 900°F).
Cold Working
In the annealed condition, cold working of AISI 1030 steel may be performed by conventional methods. After annealing, a full or stress relief anneal may be required.
Annealing
Annealing of AISI 1030 carbon steel is carried out at 871 to 982°C (1600 to 1800°F) and then slow cooled in the furnace. Stress relief annealing may be carried out at 538°C (1000°F).
Hardening
AISI 1030 carbon steel is hardened by heat treatment or cold working.
Applications
AISI 1030 carbon steel is suitable for manufacturing machinery parts.