Does the Grossmann H value have units?

Yes. This tool follows the Grossmann inch-based system, where H is expressed in in⁻¹. When multiplied by diameter D in inches, H·D is dimensionless.

Can a cooling curve be converted directly to an H value?

A single cooling curve does not provide a unique direct conversion. A cooling curve is the response of a specified probe under specified test conditions; H is a parameter in the idealized Grossmann boundary heat-transfer model and requires a suitable inverse model or calibration from known steel, size, and microstructural results.

Do the listed oil and water H values represent an actual quench tank?

No. The values are historical reference ranges from Grossmann 1942 and are only for early estimates and sensitivity analysis. A specific tank must be calibrated for medium condition, bath temperature, relative motion, load, and workpiece results.

Quench severity H and cooling analysis report

Bring material, workpiece and quenching conditions together for comparison and discussion.

H Keep the unit:This page follows the Grossmann inch-based system. H has units of in⁻¹; H·D is dimensionless only when D is in inches. H is not a heat-transfer coefficient or a fixed medium “grade” independent of operating conditions.

Input basis

Measured, inversely determined, or workpiece-calibrated H; or a literature reference range

Model use

Combine with DI to estimate the 50% martensite center critical diameter of an infinitely long round bar

Does not replace

Tank cooling curves, process validation, or actual microstructural examination

Anran quenching media

Each of the four products has its own application and is available separately. Comparing curves does not establish suitability for the same material.

H-Value Input

Grossmann H(in⁻¹)

Only finite values greater than zero are accepted; the page does not clamp or replace an out-of-range entry.

Historical Grossmann 1942 Condition

Lower bound

Upper bound

Unit

in⁻¹

This control selects a boundary; it does not generate a “typical value.” The selected value is only for preliminary sensitivity calculations and does not represent the measured H of your tank or a commercial quenchant.

Valid input. The current value can be passed to the round-bar critical-diameter calculator.

Model Input Result

Known / Calibrated Grossmann H

0.400

in⁻¹

Data type: User-entered known or calibrated value.

Dimensional input

H = 0.400 in⁻¹

Dimensionless group

H × D (D must be in inches)

Model object

Infinitely long round bar, 50% martensite at the center

Condition dependence

Medium condition, temperature, relative motion, load, and workpiece surface

Grossmann 1942 Table 17 Historical Reference Ranges

Medium	Relative motion	H lower	H upper

The air value is a traditional handbook reference; the oil and water ranges come from Table 17 of the 1942 paper by Grossmann and co-authors. This is historical engineering guidance, not an ASTM A255 tank-measurement table, and it contains no inferred H value for any Anran product.

Pass the current H to the round-bar critical-diameter calculator

Method and limits: Grossmann, Asimow & Urban (1942), “Hardenability, Its Relation to Quenching, and Some Quantitative Data Concerning It”. ASTM D6200 and ISO 9950 specify cooling-characteristic tests with defined probes and test conditions. Without a validated inverse or calibration model, a cooling curve cannot be converted uniquely and directly to H.

1. Workpiece

Material

Workpiece geometry

Maximum effective size (mm)

Additional workpiece information (optional)

Manufacturing type

Heat number or batch

Minimum wall thickness (mm)

Piece mass (kg)

Cavities or shielding Abrupt section changes Dense loading

Workpiece temperature before immersion (°C)

Holding time (min)

2. Quenching conditions

Quenching medium

Measured curve

Concentration or ratio

Medium temperature (°C)

Relative motion

Additional test parameters (optional)

Kinematic viscosity (mm²/s)

Preliminary analysis available The final process must still be verified against workpiece dimensions and production conditions.

Curve basis Select a measured curve.

3. Generate report

Question to resolve (optional)

Grossmann H--

Material and workpiece--

Quenching medium--

Data status--

Input conditions and analysis boundaries

Cooling curves and actual-workpiece data

Standard-probe data and measured internal temperatures from an actual workpiece are shown separately. They are different data types and must not be substituted for one another.

Measured standard-probe curveMeasured medium response under the specified probe and test conditions

Software-predicted curveNot used in this report; any prediction must be identified separately

Measured internal curve of the actual workpieceShown only when internal workpiece temperature data are available

Standard-probe cooling curve

Waiting for report generation.

Actual-workpiece surface and core curves

Generated only when actual-workpiece temperature data are available or when a model has been validated against workpiece results.

No measured internal temperature curve from an actual workpiece is available for this report. The system does not substitute a standard-probe curve or draw an automatic prediction.

Data gaps and review items

Contact an engineer

Reports and PDFs are generated locally in your browser and are not uploaded or sent automatically. Only anonymous button-use events are recorded. Contact us by email or another direct channel for an engineering review; sharing a report is optional.

How to use the tool and get product support

Start with the product you need

AR-HCCI for high-chromium cast iron | AR-SAG for Cr–Mo steel SAG liners | AR-UHS ultra-high-speed quenchant | AR-GP general-purpose water-based quenchant.

See the dedicated product pages for high-chromium cast iron and SAG liners. This curve comparison does not automatically recommend every product for Chinese grade 45 steel.

H value: quenching conditions in the model

Enter a known H value or one calibrated against workpiece results. H is not hardness or a fixed brand property. This tool uses in⁻¹ with diameters expressed in inches.

Historical ranges support preliminary sensitivity comparisons. Without a calibrated relationship, a standard-probe curve is not converted into one unique H value.

Use the report independently or contact us directly to buy products

This page organises inputs and available curves; it does not establish a workpiece-specific cooling profile. Use the report alone or ask separately about fluids, testers or fixtures. Completing a report is not a purchase requirement.

Recognise the three data types in the report

Standard-probe measurement: medium response for that probe and test conditions.
Software prediction: model results identified separately. No prediction curve is generated when no prediction model is used.
Actual internal workpiece measurement: readings from points inside the workpiece. Missing workpiece data are not replaced by probe curves.

Start the conversation with a short request

Product enquiries need only an email and a message. You may send a report or original curves to zzx@anrandht.com for engineering discussion. A quote is available even if you have no data or prefer not to share them.

Printing or saving a PDF does not send the report to Anran. The website records feature usage events; providing report text is not required to use the tool.

Data classification

Three data types must remain separate

Every curve and conclusion on this site is identified by how the data was obtained.

01 / MEASURED

Measured standard-probe cooling curves

Describes the medium response for the stated probe and test conditions. It is not the surface or core curve of a production workpiece.

02 / PREDICTED

Software-predicted curve

Calculated from a stated model and inputs. It is a prediction, not measured production data.

03 / WORKPIECE

Measured internal workpiece cooling curves

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

Explore other products as needed

Every product can be quoted and purchased separately. Choose complementary products only when needed.

AR-HCCI high-chromium cast iron quenchant AR-SAG quenchant for Cr–Mo steel SAG mill liners AR-UHS ultra-high-speed quenchant AR-GP general-purpose water-based quenchant

Ask directly about products and pricingAn email address and a short message are enough. Technical files are optional.