SAE 1055/AISI 1055 Carbon Steel

SAE 1055/AISI 1055 Carbon Steel manufacturers and suppliers,delivered in round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

SAE 1055/AISI 1055 Carbon Steel is a medium carbon steel which is characterized by good weldability, good machinability, high strength and impact properties in either the normalized or hot forged condition. SAE 1055/AISI 1055 steel is widely used for axles, bolts, forged connecting rods, crankshafts, torsion bars, light gears, guide rods etc.

AISI 1055 carbon steel bar
Chemical Composition
Grade C Si Mn Cr Mo P S
0.52-0.6 ≤0.4 0.6-0.9 ≤0.4 ≤0.1 ≤0.035 ≤0.035
AISI/SAE 1055 0.5-0.6 0.07-0.6 0.6-0.9 ≤0.04 ≤0.05
JIS S55C 0.52-0.58 0.15-0.35 0.6-0.9 ≤0.2 ≤0.03 ≤0.035
GB 55  0.52-0.6  0.17-0.37  0.5-0.8  ≤0.25  –  ≤0.035  ≤0.035
Shape Size(mm) Process Tolerance Length(mm)
Round Φ6-Φ50 Cold Drawn H11 3000-5800
Round Φ40-Φ300 Hot Rolled -0/+3mm 3000-10000
Round Φ120-Φ1000 Hot Forged -0/+3mm 3000-10000
Flat/Square/Block Thickness:120-800
Hot Forged -0/+3mm 500-6000

Heat Treatment
Normalizing For SAE 1055
1.Nominal normalizing temperature:820-850°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing For SAE 1055
1.Nominal Annealing temperature:650-710°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 217

Hardening and Tempering(QT) For SAE 1055
1.Nominal Hardening temperature:820-870°C
2.Hold at this temperature then quench in oil or water
3.Tempering  as soon as possible when the temperature low to ambient
4.Heat uniformly to the suitable temperature of 600-630°C
5.keep the material out of the furnace ,then cool in the air

Mechanical Property( for reference only)
1.Tensile strength: 645MPa
2.Yield point: 380MPa
3.Percentage reduction of area after fracture: 35%
4.Elongation after fracture: 13%
5.Impact test (+20°C): Transverse – 14-25J; Longitud – 36~48J

Delivery Condition
1.Shape:Round/Square / Flat/Shafts/Rollers/Blocks
2.Surface condition:Black surface/Bright surface
3.Heat Treatment:Normalized/Annealed/QT
4.Straightness:Max 3mm/m(Enhanced straightness may be available on request)
5.Length:3000-5800mm suitable for 20″container.  above 6000mm,suitable for 40″ container
6.Grain Size: 5-8 acc to ASTM E112-96
7.Ultrasonic Standard: Sep1921/ASTM A388/EN 10228-3
8.Typical Hardness:HRC60
9.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
10.Forging Ratio: minimum 4 : 1
11.Marking: Grade/Weight/Length/Size/Heat Number

Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.Ultrasonic test report