6 Professional Heat Treatment Calculators

About These Calculators

These free online heat-treatment calculators use established metallurgical models and international standards:

• DI Calculator—calculates ideal critical diameter for non-boron steel using the Grossmann multiplying-factor relationship. DI is the diameter at which the center of a round bar reaches 50% martensite under ideal infinite quench severity.
• H-Value Guide—retains the in⁻¹ unit of H, distinguishes a user-known or calibrated value from historical Grossmann reference ranges, and does not equate a cooling curve directly with H.
• Round-Bar Critical Diameter—numerically solves the Dc/DI relationship at finite H and states that the result applies only to the 50% martensite center criterion for an infinitely long round bar.
• Measured Jominy Analysis—analyzes only user-entered end-quench distance–hardness points; it does not extrapolate a crossing beyond the measured range or generate preset steel-grade curves.
• Media H-Range Screening—back-calculates the minimum H required for a target round bar and classifies each candidate range as fully meets, conditional, insufficient, or no finite solution.
• Carbon Equivalent—three weldability formulas: CE(IIW) per ISO 2560, Pcm (Ito-Bessyo) for microalloyed steels, and CET (ThyssenKrupp) for higher-alloy grades. Risk levels follow AWS D1.1 and EN 1011-2 guidance.

DI, H, round-bar critical diameter, and media-range screening can pass confirmed inputs through CalcBridge; the Jominy tool keeps measured data separate so empirical-model output is not presented as a measured end-quench curve.