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Sign In What are Decarb Free Rounds?
Decarb Free Rounds (DCF) are steel rods or round bars that are 100% free from decarburization and are manufactured without a decarbonized or oxidation-prone surface layer.
Carbon loss on the surface of the steel affects its properties, especially its hardness and strength. Decarb Free steel rounds are oversized to finish to nominal diameter.
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WHAT MEANS "DECARB FREE" IN DECARB FREE ROUNDS?
Decarb Free refers to the process where carbon is lost from the surface of a piece of steel. This loss of carbon can affect the surface properties of the steel. This process typically occurs by heating the steel in a specific atmosphere containing oxygen.
WHAT ARE DECARB FREE ROUNDS USED FOR?
Decarb Free Rounds are also referred to as Decarburized Rounds and are used in areas where it is important that the steel's surface has uniform mechanical properties across its entire cross-section.
Some applications of Decarb Free Rounds include:
• Tool making
• Machinery construction
• Precision parts
Decarb Free Rounds in Tool Manufacturing:
For tools exposed to high stress, a uniform hardness throughout the entire cross-section of the tool is essential.
Decarb Free Rounds in Mechanical Engineering:
In certain applications where steel components must meet precise tolerances and need to exhibit high resistance to fatigue.
Decarb Free Rounds for Precision Parts:
For some components where the accuracy of dimensions and consistent strength of the material are particularly important.
APPLICATIONS OF DECARB FREE ROUNDS
• Parts for heavy machinery
• Bolts
• Bearings
• Molds
• Bolts
• Bearings
• Molds
• Punches
• Dies
• Gears
• Shafts
• Dies
• Gears
• Shafts
• Pinions
• Piston rods
• Axles
• High-strength bolts
• Piston rods
• Axles
• High-strength bolts
• Fasteners
• Punching tools
• Mandrels
• Spindles
• Punching tools
• Mandrels
• Spindles
The use of Decarb Free Rounds thus ensures high quality and strength of the steel. The decarburization of the surface provides consistent mechanical properties.
HOW ARE DECARB FREE ROUNDS MADE?
The process for making Decarb Free Rounds primarily involves the following basic steps:
• Steel selection
• Decarburization
• Cutting and sawing
• Surface finishing
• Quality control
STEEL SELECTION FOR DECARB FREE ROUNDS
Depending on the properties and application, a specific grade of steel is chosen. Decarb Free Rounds are available, among others, in the following common steel grades:
• A2
• D2
• H13
• D2
• H13
• L6
• O1
• S7
• O1
• S7
• 410
• 420
• 431
• 420
• 431
• 440C
• 4140PH / 4142PH
• 4140PH / 4142PH
Decarburization of Decarb Free Rounds
When the steel is heated, the carbon on the steel's surface reacts with the oxygen in its environment. This chemical reaction produces carbon dioxide or carbon monoxide. As a result, there is a reduced carbon concentration in the outer layer of the steel.
Cutting and sawing Decarb Free Rounds
Decarb Free Rounds are cut or sawed at both ends to ensure they reach the desired length.
Decarb Free Rounds Surface finishing
Another step in producing Decarb Free Rounds is surface finishing. DCFs undergo a machining process. Through surface peeling or rough turning, the decarbonized layer is removed from the surface, leaving the steel shiny and smooth. Thus, the Decarb Free Steel is technically free from surface defects and decarburization.
Quality control of Decarb Free Rounds
After production, Decarb Free Rounds are checked for their quality and specified tolerances. This is done through visual inspection, microscopy, or various non-destructive testing methods.