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AISI 4140 / ASTM A29
SAE 4140 steel is a low-alloy steel grade under the standards of the American Society of Automotive Engineers(SAE).
In the quenched and tempered condition, SAE 4140 steel has good strength, toughness, wear resistance and fatigue resistance.Therefore, SAE 4140 steel is usually delivered in the pre-hardened condition(PH) with hardness 28-34HRC.
SAE 4140 alloy steel has many applications as forgings in the automotive, aerospace, oil and gas industries, typical uses are forging gears and shafts, spindles, clamps, clamps and collars.
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.04 | 0.8-1.1 | 0.15-0.25 |
What is the difference between ASTM 4140,AISI 4140 and SAE 4140?
First of all, let's make it clear that SAE, AISI and ASTM represent the three major American associations, namely the Society of Automotive Engineers (SAE), the American Iron and Steel Institute (AISI), and the American Society for Testing and Materials (ASTM).
Heat treatments applied on AISI 4140 round bars are annealing, quenching, hardening, normalizing, tempering, etc. Heat treatments can vary the mechanical properties of the SAE 4140 alloy steel. The AISI 4140 material is tested for a variety of parameters such as impact testing, mechanical testing, chemical analysis testing, bent testing, etc. Heat Treated AISI 4140 round bars are of very tensile strength and are used to make steel products.
Finishing rolling process:
Finishing rolling is a process to obtain higher precision and better surface quality by rolling the heat-treated seamless steel pipe multiple times. The specific steps include: heat treatment - pickling - cooling - finishing rolling - sizing - cutting - length - inspection - packaging. Finishing rolling can improve the precision, surface quality and mechanical properties of steel pipe.
Cold drawing process:
Cold drawing is a process of drawing the heat-treated seamless steel pipe one by one in a cold state to obtain high precision, high surface quality and high mechanical properties. The specific steps include: heat treatment - pickling - cooling - cold drawing - deoxygenation - wet pickling - cold water washing - leveling - straightening - pickling - cold water washing - oxide skin - cold drawing - sizing - straightening - pickling - cold water washing - deoxygenation - polishing - inspection - packaging. Cold drawing can significantly improve the dimensional accuracy, surface quality and mechanical properties of steel pipes.
Hot rolling production process:
Hot rolling is the process of heating the blank to a certain temperature, and then forming it into seamless steel pipe through multiple rolls. The specific steps include: heating - rolling - roll probe - sizing - cooling - trimming - rod breaking - inspection - packaging. Hot rolling can produce seamless steel pipes with large diameters and wall thickness, but the accuracy and surface quality are not as good as fine rolling and cold drawing.
These three processes have different applications in the production of seamless precision steel pipes, and the specific choice depends on the required dimensional accuracy, surface quality and mechanical properties.
SAE 4140 steel is a low-alloy steel grade under the standards of the American Society of Automotive Engineers(SAE).
In the quenched and tempered condition, SAE 4140 steel has good strength, toughness, wear resistance and fatigue resistance.Therefore, SAE 4140 steel is usually delivered in the pre-hardened condition(PH) with hardness 28-34HRC.
SAE 4140 alloy steel has many applications as forgings in the automotive, aerospace, oil and gas industries, typical uses are forging gears and shafts, spindles, clamps, clamps and collars.
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.04 | 0.8-1.1 | 0.15-0.25 |
What is the difference between ASTM 4140,AISI 4140 and SAE 4140?
First of all, let's make it clear that SAE, AISI and ASTM represent the three major American associations, namely the Society of Automotive Engineers (SAE), the American Iron and Steel Institute (AISI), and the American Society for Testing and Materials (ASTM).
Heat treatments applied on AISI 4140 round bars are annealing, quenching, hardening, normalizing, tempering, etc. Heat treatments can vary the mechanical properties of the SAE 4140 alloy steel. The AISI 4140 material is tested for a variety of parameters such as impact testing, mechanical testing, chemical analysis testing, bent testing, etc. Heat Treated AISI 4140 round bars are of very tensile strength and are used to make steel products.
Finishing rolling process:
Finishing rolling is a process to obtain higher precision and better surface quality by rolling the heat-treated seamless steel pipe multiple times. The specific steps include: heat treatment - pickling - cooling - finishing rolling - sizing - cutting - length - inspection - packaging. Finishing rolling can improve the precision, surface quality and mechanical properties of steel pipe.
Cold drawing process:
Cold drawing is a process of drawing the heat-treated seamless steel pipe one by one in a cold state to obtain high precision, high surface quality and high mechanical properties. The specific steps include: heat treatment - pickling - cooling - cold drawing - deoxygenation - wet pickling - cold water washing - leveling - straightening - pickling - cold water washing - oxide skin - cold drawing - sizing - straightening - pickling - cold water washing - deoxygenation - polishing - inspection - packaging. Cold drawing can significantly improve the dimensional accuracy, surface quality and mechanical properties of steel pipes.
Hot rolling production process:
Hot rolling is the process of heating the blank to a certain temperature, and then forming it into seamless steel pipe through multiple rolls. The specific steps include: heating - rolling - roll probe - sizing - cooling - trimming - rod breaking - inspection - packaging. Hot rolling can produce seamless steel pipes with large diameters and wall thickness, but the accuracy and surface quality are not as good as fine rolling and cold drawing.
These three processes have different applications in the production of seamless precision steel pipes, and the specific choice depends on the required dimensional accuracy, surface quality and mechanical properties.
