Standard-probe measured curve
Describes the medium response for the stated probe and test conditions. It is not the surface or core curve of a production workpiece.
6 Professional Heat Treatment Calculators
Free data tools for materials and heat-treatment engineers. Each result states its criterion, units, validity range, and the production verification it cannot replace.
1 DI from Composition
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2 Review H Value
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3 Round-Bar Critical Diameter
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4 Measured Curve / Media Screening
Ideal Critical Diameter (DI)
Calculate DI for non-boron steel from eight elements and austenite grain size using the Grossmann multiplying-factor relationship; calculation stops outside the published composition range.
Open DI Calculator
Grossmann H Value
Enter a measured or workpiece-calibrated H value and review the historical Grossmann 1942 oil and water ranges, with H units and model limits stated.
Open H-Value Guide
Maximum Round-Bar Critical Diameter
Combine DI and H to solve the critical diameter for 50% martensite at the center of an infinitely long round bar, check a target diameter, and back-calculate the minimum H.
Open Round-Bar Calculator
Measured Jominy Curve Analysis
Enter measured end-quench distance–HRC data to analyze the 50% martensite crossing, in-range interpolation, and abnormal rises; no curve is fabricated from a steel grade.
Open Measured-Curve Analyzer
Quenchant H-Range Screening
Back-calculate the minimum H from DI and target round-bar diameter, then transparently check candidate measured or calibrated ranges without unsupported best-media ranking.
Open H-Range Screener
Carbon Equivalent (CE)
Assess weld-cracking risk with three industry formulas—CE(IIW), Pcm (Ito-Bessyo), and CET (ThyssenKrupp)—plus an interactive risk gauge and preheat guidance.
Open Carbon-Equivalent Calculator
TECHNICAL RESOURCES
Move from a calculation to products, measured evidence, standards and technical articles
A calculator supports initial screening. The next step is to connect the result to an Anran quenchant, a cooling curve with stated conditions, the governing material standard and the relevant technical article.
01 / PRODUCT-LED H
H value and Anran quenchants
Review the AR-HCCI, AR-SAG and AR-UHS application boundaries before entering a measured or calibrated H value.
Open H-value product selection 02 / MEASURED CURVESMeasured high-chromium cast-iron comparison
Select air cooling and three bath temperatures individually or together, with the chart and table synchronized.
View the AR-HCCI core data 03 / MATERIAL STANDARDSMaterial standards library
Focused on material specifications, property tests, metallography, chemical analysis and inspection of castings and forgings.
Search material standards 04 / TECHNICAL BLOGHeat-treatment technical blog
Original articles on quenchants, CCT curves, cracking and distortion, recovered and reorganized for the current site.
Read technical articlesAbout 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.
Data classification
Three data types must remain separate
Every curve and conclusion on this site is identified by how the data was obtained.
Software-predicted curve
Calculated from a stated model and inputs. It is a prediction, not measured production data.
Real-workpiece internal measured curve
Comes from internal points in the actual workpiece and is used to assess the real cooling process against post-quench hardness, microstructure and properties.
Unless explicitly identified and validated, one data type cannot be converted into or substituted for another.Read the technical method
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