4118 steel is one of popular alloy steel used as engineering steel. Otai steel is one of the leading supplier of ASTM 4118 steel materials in reliable quality.
ASTM A29 4118 standard applies to manufacture of bearing ring steel pipe rolling elements made by high-carbon chromium bearing steel processed with hot rolled forged round, steel wire, cold rolled. Continuous casting steel is not recommended to be the material of balls.
ASTM A29 4118 Steel one steel grade in ASTM A29 standard. ASTM 4118 steel is one of popular alloy steel used for engineering purpose, like fasteners, high pressure pipe and more advanced carburized parts, such as gear, shaft, etc. which work in the noncorrosive medium and temperature below 250 ℃, working with nitrogen hydrogen mixture in the medium.
4118 alloy steel Chemical Composition
| Grade | The Element Max (%) | ||||||
| C | Mn | P | S | Si | M o | Cr | |
| A29 4118 | 0.18-0.23 | 0.7-0.9 | 0.035 | 0.035-0.05 | 0.15-0.35 | 0.08-0.15 | 0.4-0.6 |
Supply Range for AISI alloy 4118 steel bar
4118 Steel Round Bar: diameter 8mm – 1000mm
4118 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
4118 Steel Grade Square: 20mm – 500mm
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
Mechanical Properties of AISI Alloy 4118
| Properties | Metric |
| Tensile strength | 517 MPa |
| Yield strength | 365 MPa |
| Bulk modulus (typical for steel) | 140 GPa |
| Shear modulus (typical for steel) | 80.0 GPa |
| Elastic modulus | 190-210 GPa |
| Poisson’s ratio | 0.27-0.30 |
| Elongation at break (in 50 mm) | 33.00% |
| Reduction of area | 63.70% |
| Hardness, Brinell | 137 |
| Hardness, Knoop (converted from Brinell hardness) | 156 |
| Hardness, Rockwell B (converted from Brinell hardness) | 75 |
| Hardness, Vickers (converted from Brinell hardness) | 143 |
| Machinability (hot rolled and cold drawn, based on 100 machinabilities for AISI 1212 steel) | 60 |
Forging of ASTM Grade 4118 Steel
Hot forming temperature: 1100-850oC.
AISI 4118 alloy Steel Heat Treatment
1.Normalizing
Normalizing temperature: 860-900oC.
2.Hardening
Harden AISI 4118 steel from a temperature of 850-880oC followed by oil or water quenching. Hardness after quenching is 39-47 HRC.
3.Tempering of 4118 steel
Tempering temperature: 595-700oC.
Application of AISI 4118 Alloy Steel
ASTM 4118 case hardening alloy steels are widely used as gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes. Otai steel is available to supply different size of AISI 4118 steel and is able to supply modified 4118/SCM420/18CrMo4 steel composition according to different requirements.
Contact
If you have any 4118 alloy steel inquiries and questions for Price, Application, hot treatment, Please don’t hesitate to contact us.
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