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CNC Steel Machining


Steel is an alloy material with iron as the main element, carbon content of 0.0218-2.11%, and other elements.


Steel is used in several industries as a material in metal manufacturing services. You may think that the machinability of hard metals is difficult. Tuofa has accumulated extensive experience in the design, prototyping and production of parts and assembled components. We have achieved greater flexibility in hard metal machining applications with CNC technology from top machinists, while advanced CNC machines help keep our costs running low.


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Advantages of Steel Parts


As widely used steel parts, Tuofa mechanical engineers can bring you a lot of convenience through CNC machining.


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With good plasticity and toughness, it can be easily machined into parts of any shape to meet the needs of various industries.

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High Strength

The strength of steel materials ranges from several hundred to several thousand megapascals. It can be assembled accurately and quickly as various components and parts in industrial machinery.

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Stable Quality

The material is relatively uniform, with high safety and reliability, and the steel parts can replace riveting and partial welding as high-strength bolts.

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Good Sealing

The welded steel parts can be completely airtight, so they are suitable for the construction of gas irrigation, oil cylinders, pipelines and high-pressure vessels that require good air and water tightness.




1018 Steel Properties


AISI 1018 steel is a low carbon steel with ductility. Basically, they are more feasible in workability and weldability than medium and high carbon content steels.


1018 steel mechanical properties

1018 Steel Chemical Properties

Tensile Strength (MPa): 450 Chemical composition (%):
Yield strength (MPa): 275 C: 0.17 - 0.24
Elongation (%): 24 Mn: 0.70 - 1.00
Section shrinkage (%): 50 P: 0.035
Hardness : 197HB without heat treatment S: 0.035
  Si: 0.17- 0.37
  Cr: 0.25
  Cu: 0.25
  Ni: 0.25
Similar steel grades: Chinese steel materials close to the grade such as 16Mn steel h or 20Mn steel.
Forging: heated to 1275°C, forging should be stopped when the temperature of the forging is lowered to below 910°C.
Uses: As the carbon content increases, the strength also increases, accompanied by a small decrease in cold formability. The higher Mn content increases the hardenability of surface-hardened parts slightly. Widely used in the manufacture of pistons, screws, drive shafts, machine tools and springs.


1018 Steel Heat Treatment


Normalizing: Heat to 925°C, cool.


Annealing: Heating to 885°C, slow cooling, preferably in a cooler or with the furnace.


Surface hardening: parts can be hardened and wear-resistant by carbonitriding, the depth of the layer formed depends on the heating temperature and time.


Tempering: Tempering at 150-205°C can reduce the brittleness of the part's seepage layer without causing a decrease in surface hardness.



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The high-quality CNC steel components have high durability and are not easily damaged during long-term operation, and are not prone to external deformation. This reduces the amount you spend on future repairs and maintenance.




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1045 Steel Properties


1045 steel is a medium carbon structural steel with good hot and cold workability and good mechanical properties. Due to its low price and wide availability, it is widely used in the industrial machinery manufacturing industry.


1018 Steel Mechanical Properties

1045 Steel Chemical Properties

Density (kg/m3): 7850 Chemical composition (%):
Tensile strength(MPa): 600 C: 0.43 - 0.50
Yield strength (MPa): 355 Si : 0.17 - 0.37
Elongation (%): 16 Mn: 0.60 - 0.90
Impact work (J): 39 S: 0.050
Impact toughness value (J/cm2): 49 P: 0.040
Hardness: unheated 229HB; annealed 197HB Cr: 0.25
  Ni: 0.25
  Cu: 0.25
Uses: ASTM 1045 steel is used to manufacture parts with high strength requirements, such as gears, shafts, piston pins, etc. and machined parts, forgings, stampings and bolts and nuts that are not subjected to large forces.



CNC machining metals is unique to each industry and application. Tuofa mechanical engineers and designers understand the materials, manufacturing processes and applications of the part to determine the appropriate method of manufacturing the part.


Would you like to learn more about how we work in the prototyping and production of steel parts?

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4140 Steel Properties


It is one of the most widely used medium carbon alloy steels. The price is relatively cheap, fully hardened 4140 steel varies with the accuracy of the carbon content. Malleability is very good, but machinability is only moderate. Weldability is not good, as it is sensitive to welding cracks.


1018 steel mechanical properties

1018 Steel Chemical Properties

Density (kg/m3): 7850 Chemical composition (%):
Tensile strength (MPa): 1080 C: 0.38 - 0.45
Yield strength (MPa): 930 Si: 0.17 - 0.37
Elongation (%): 12 Mn0.50 - 0.80
Section shrinkage (%): 45 Cr: 0.9 - 1.20
Impact power (J): 63 Mo: 0.15 - 0.25
Impact toughness value (J/cm2): 78 P: 0.035
Hardness: 217HB S: 0.035
  Ni: 0.30
  Cu: 0.30

Similar steel grades: Chinese steel materials close to the grade such as 42CrMo steel or Japan's SCM440 steel.

Forging: Heating up to 1230℃, forging should be stopped when the temperature of forgings is reduced to about 870℃ or less.

Uses: such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods under extreme load and spring clips, h can also be used for bending machine dies.


1018 Steel Heat Treatment


Normalizing: Heating to 870℃, air cooling.


Annealing: In order to make the lamellar pearlite organization predominate, heat to 845℃, then cool rapidly to 755℃, then cool from 755℃ to 665℃ at a rate of no more than 14℃/h and keep for 5h.


Quenching: Austenitizing at 855°C and oil quenching.


Tempering: After quenching and reheating, the desired hardness has been obtained.


Nitriding: 4140 steel is suitable for nitriding with ammonia gas.



People Also Ask


Can you cut steel with a CNC?


Of course. Generally 6mm or more steel plate is recommended to be cut by CNC machine, because such steel plate produces little thermal deformation.


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