BHN to HRC Converter

About This Tool

This tool estimates Rockwell hardness (HRC) from Brinell hardness (BHN) values. It is intended for materials engineers, QA technicians, researchers, and students who encounter BHN readings and need a compatible HRC estimate for material selection, failure analysis, or design decisions. The tool supports common engineering materials and provides material-specific approximations rather than a generic one-size-fits-all mapping.
Core Logic & Features: Required inputs are BHN_value and material_type (Steel, Cast Iron, Aluminum, Copper, Other). Optional inputs include ball_diameter_mm and test_load_kN to refine the curve. The system uses material-specific empirical conversion curves derived from published hardness data and interpolates between points to produce an HRC estimate. An explicit confidence interval accompanies the result, and warnings are raised when inputs fall outside validated ranges. Outputs include HRC, confidence bounds, and an optional note.
Inputs & Outputs: Inputs: bhn_value (numeric, HBW/HB), material_type (enum), ball_diameter_mm (numeric, mm, optional; default 10), test_load_kN (numeric, kN, optional; default 30). Outputs: hrc_value (numeric, HRC), confidence_min and confidence_max (numbers, HRC units), notes (string). Validation enforces bhn_value within typical ranges (100–700) for standard curves; if outside, the tool returns best-effort estimate with wider bounds and a clear warning. Range handling ensures monotonic behavior with BHN.
Algorithms & Calculations: The tool applies material-specific regression curves with simple interpolation between known calibration points. When a material is not explicitly listed, a generic curve with a broader confidence band is used. The algorithm favors accuracy in the mid-range (roughly BHN 150–550) and signals when extrapolation occurs.
Error & Edge Cases: Missing inputs yields validation error; BHN outside validated ranges yields wide confidence intervals. Unsupported material types use a general curve. Inconsistent inputs produce explicit error notes. The tool does not replace standardized hardness testing or calibration. Industry/Region & Localization: Units follow international practice; results are in HRC and BHN where applicable. Assumes standard Brinell test conditions; not a substitute for calibration or accreditation tests. Not all materials map precisely to HRC; use as screening and decision support.

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