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# GCarb
The GCarb Utility can be used to design a gas carburization process to reach a desired case depth based on time, temperature, and carbon potential. By giving a gas carburization schedule, the utility can also predict the carbon profile and as-quenched hardness of the part.
## Use Case
As stated, the GCarb utility can be used for both process design, and prediction. To use the process design feature, first, select the material that you want to use. In this case, we are going to select the U4140 material.
Next, we are going to define the design parameters inside the Process tab. The furnace round up time represents the resolution at which we can control the time period. In this case, a round up time of 5 means that the time period will be rounded up or down to a multiple of 5. Next, the effective case depth and carbon at the ECD need to be defined. For this process, we are going to try to use 1 step, a temperature of 925 oC, and a carbon potential of 0.8% to find a step time needed. This utility tool can fit for multiple steps also. The TBD represents the value that we are going to design for. In this case, it will be the step time.
Based on the design parameters defined, the time required to reach 0.8% carbon at 1 mm depth is 143,810 seconds, or approximately 40 hours.
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