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 SupplySize(mm)Length(mm)
Round barΦ6-Φ10003000-10000
Square bar100 x 100-600x6003000-6000

Flat bar/Blcoks
Thickness :120-800
Surface FinishBlack-ForgedBlack-RolledRough Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

2.Chemical Composition & Related Specifications

10180.15-0.200.2-0.40.60-0.90≤ 0.04≤ 0.05

3. Mechanical Property

Surface FinishTensile Strength MpaYield Strength MpaElongation, %Hardness,HB
Bright Drawn430 - 750340 - 600≥ 12120 - 220
Smooth Turned410 - 560230 – 330≥22120 - 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


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


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.


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.


  • Shafts
  • Spindles
  • Pins
  • Rods
  • Sprocket assemblies
  • Axles,bolts
  • Fixtures, mounting plates ,spacers
  • Machinery parts
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