Project Description
AISI 1018 low carbon steel offers a good balance of toughness, strength and ductility which is the most commonly available grade around the world.Although its mechanical properties are not very unique, it still can be easily formed, machined, welded and fabricated.AISI 1018 steel has excellent weldability and produces a uniform and harder case,and it is considered as the best steel for carburized parts.It may be hardened by carburizing and by other surface-hardening methods.It can attain typical surface hardness to HRC 58 by carburise.
1.AISI 1018 steel Supply Form & Size &Tolerance
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1000 | 3000-10000 |
| Square bar | 100 x 100-600x600 | 3000-6000 |
Flat bar/Blcoks | Thickness :120-800 | 2000-6000 |
| Width:120-1500 |
| Surface Finish | Black-Forged | Black-Rolled | Rough Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
2.Chemical Composition & Related Specifications
| Grade | C | Si | Mn | P | S |
| 1018 | 0.15-0.20 | 0.2-0.4 | 0.60-0.90 | ≤ 0.04 | ≤ 0.05 |
| Germany | UK | China | Japan |
| C15/1.0401 | 080A15 | 15# | S15C |
3. Mechanical Property
| Surface Finish | Tensile Strength Mpa | Yield Strength Mpa | Elongation, % | Hardness,HB |
| Bright Drawn | 430 - 750 | 340 - 600 | ≥ 12 | 120 - 220 |
| Smooth Turned | 410 - 560 | 230 – 330 | ≥22 | 120 - 170 |
4.Forging of AISI 1018 steel
Heat to 1150°C – 1280°C
Hold until uniform
Minimum forging temperature 900°C
Air cooling after forged
5.Heat Treatment
- Normalising: 890–940°C°C,air cooling
- Annealing:870–910°C°C,furnace cooling
- Stress Relieving: 500–700°C,air cooling
- Carburising:880 –920°C
- Core Refining:780–820°C,Quench in water
- Case Hardening:780–820°C,Quench in water
- Carbonitriding:800°C – 875°C,Quench and Temper as required
6.Machinability
The machinability of AISI 1018 is rated at 62% of AISI 1112 carbon steel. Machining provides this material with a fine finish, with continuous and hard chips. It is possible to machine this steel in all conditions
7.Welding
AISI 1018 steel can be instantly welded by all the conventional welding processes,such as gas, oxyacetylene, resistance, and submerged melt welding.But welding is not recommended for this steel when it is carbonitrided and carburized.Low carbon welding electrodes are recommended in the welding procedure, and post-heating and pre-heating are not necessary. Pre-heating can be performed for sections over 50 mm. Post-weld stress relieving also has its own beneficial aspects like the pre-heating process.
8.Application
AISI 1018 is used in bending, crimping and swaging processes,and it is suitably used in applications that do not need high strength of alloy steels and high carbon.AISI 1018 is used to improve drilling, machining, threading and punching processes,and also can be used to prevent cracking in severe bends.
TYPICAL APPLICATIONS:
- Shafts
- Spindles
- Pins
- Rods
- Sprocket assemblies
- Axles,bolts
- Fixtures, mounting plates ,spacers
- Machinery parts
