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Heat Treatment Inspection Report Template for Mold Components

This guide explains how to build and use a heat treatment / surface treatment inspection report for mold components. It covers the required fields for steel grade, hardness, case depth, coating thickness, furnace traceability, incoming verification, and nonconformance closure. You can download the template, review the web version, and use the checklist to standardize supplier records for inserts, cores, cavities, slides, and wear components.

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Need the form mapped to your mold component list? Request an engineering review.
PVD surface treatment and heat treatment verification for precision mold components

What Is a Heat Treatment Inspection Report for Mold Components?

Definition: Requirement + Verification + Traceability

In precision mold manufacturing, a Heat Treatment Inspection Report is more than just a supplementary PO attachment or a simple hardness slip. It is a formal quality record that bridges engineering requirements with physical results.

It serves as a legal-technical document confirming that specific metallurgical processes (vacuum hardening, nitriding, etc.) have been executed as per the drawing specifications, providing the critical traceability link between the supplier's furnace batch and the individual mold component's lifecycle.

Why Standard Reports Are Insufficient

Relying solely on a generic "pass" slip creates significant operational risk. Mold shops require dedicated forms because:

  • Hardness is not Traceability: A hardness value alone doesn't prove which furnace batch the part belonged to if a failure occurs.
  • Complex Process Layers: Vacuum hardening, PVD coating, and nitriding each require distinct verification parameters (depth vs. hardness vs. adhesion).
  • Functional Risk: Mold inserts face high-cycle fatigue and thermal stress; verification must be functional (dimensional stability) not just metallurgical.

Critical Gaps Prevented by Standardized Documentation

Implementing a rigorous inspection form eliminates the most common "traceability gaps" found in outsourced heat treatment workflows:

  • Missing Furnace Records: Eliminates the inability to audit batch-wide material issues.
  • Vague Values: Prevents "OK" or "Pass" entries from replacing actual, measurable data points.
  • Depth Verification Gaps: Ensures case depth and nitrided layers are recorded for wear-critical surfaces.
  • NCR Loop-Hole: Guarantees formal closure and re-inspection records after a supplier rework.
Featured Snippet: What is a heat treatment inspection report?

A heat treatment inspection report is a comprehensive quality document used in mold making to record part identification, material grade, required vs. actual hardness, furnace batch numbers, and case depth. Unlike a basic hardness slip, it provides full traceability for outsourced processes, ensuring that components like cores, cavities, and slides meet functional specifications before assembly.

What Should Be Included in a Heat Treatment / Surface Treatment Form?

Part Identification Core Data

  • Mold Number
  • Project Name
  • Component Name
  • Drawing Number & Revision
  • Quantity of Parts

Material & Process Engineering

  • Steel Grade (e.g., H13, S136, 1.2344)
  • Initial Material Condition
  • Treatment Type (Vacuum, Nitriding, PVD)
  • Required Hardness (HRC/HV)
  • Required Case Depth / Coating Thickness
  • Critical Surface Notes & Distortion Limits

Supplier Traceability Logistics

  • Supplier Name & Process Date
  • Furnace Number & Batch Number
  • Operator / Shift Identification
  • Internal Report Reference Number

Incoming Inspection Verification

  • Actual Measured Hardness (Multi-point)
  • Actual Case Depth / Layer Thickness
  • Inspection Method & Specific Locations
  • Dimensional Distortion Result
  • Visual Condition & Final Disposition

Nonconformance CAPA

  • NCR Number & Issue Description
  • Containment & Supplier Action
  • Re-inspection Results
  • Final Engineering Release Decision

Field-by-Field Template Structure

Category Key Data Fields Standard for Acceptance
Metallurgy Steel Grade, Hardness Range, Case Depth ±2 HRC or Specified Micron Depth
Traceability Furnace #, Batch ID, Date, Supplier 100% Batch Correlation to PO
Geometry Distortion, Fitting Surfaces, Warpage Within Drawing Tolerance (+/- 0.01mm)
Surface Coating Thickness, Adhesion, Color Visual Consistency & Measured Layer

Download the Heat Treatment Inspection Report Template

PDF Template

Best for controlled print records. Ensures layout consistency for physical shop floor documentation and manual signing.

Download PDF

Excel Template

Optimized for editable shop & QA use. Includes pre-formatted cells for data entry, hardness calculations, and easy digital filing.

Download Excel

Web Form Version

Ideal for online completion and supplier coordination. Real-time data capture with automated traceability linkage.

Open Web Form

What is included in the download:

  • Outsourcing Order Fields
  • Verification & Inspection Fields
  • Abnormal Handling Section
  • Linked Traceability Section
Engineering Support: Need a version matched to your specific insert list, steel grades, or incoming inspection workflow? Send your current form for a professional gap review.

How to Verify Heat Treatment Results Before Releasing Mold Components

Hardness Verification

  • HRC vs HV: Selection of appropriate scales for bulk hardening vs. thin surface layers.
  • Test Locations: Definition of non-critical areas to avoid damaging molding surfaces.
  • Data over Status: Why a simple "Pass" is insufficient—actual measured values must be recorded to track process stability.

Case Depth & Nitriding Verification

  • Critical Depth: Determining when layer depth is mission-critical for wear resistance.
  • Recording Logic: Structured data entry for effective nitrided layer or case hardening results.
  • Verification Loop: When supplier reports must be validated by internal cross-checks.

Coating Thickness Verification

  • Measurable Fields: Standardizing micron-level recording for Hard Chrome and PVD.
  • Edge Risk: Identifying local under-thickness risks and coverage uniformity at sharp corners.
  • Adhesion Check: Confirming the bond strength of functional surface layers.

Distortion & Fit Verification

  • Component Check: Precision fit checks for inserts, slides, and lifter blocks.
  • Shutoff Surfaces: Verifying zero-clearance areas to prevent flash after heat treatment.
  • Recovery: Documenting dimensional changes for potential post-treatment grinding.

Supplier Document Review Checklist

In accordance with engineering traceability standards, the following records must be validated before component release:

  • Furnace Batch Report: Linking parts to the specific thermal cycle.
  • Process Record: Time/temperature curves for metallurgy audit.
  • Hardness Slip: Original supplier-measured data points.
  • Coating/Plating Report: Specific micron measurements and batch IDs.
  • CoC / Material Cert: Confirmation of steel grade and initial state.
  • Approval Signature: Final authorization by QA/Tooling Engineer.

Heat Treatment vs Surface Treatment: What Needs to Be Verified Differently?

Heat Treatment Records Focus

  • Hardness: Bulk material strength and HRC/HV values.
  • Cycle Traceability: Time-temperature quenching curves.
  • Distortion: Geometric stability after thermal stress.
  • Cracking Risk: Internal stress relief and quench integrity.

Surface Treatment Records Focus

  • Thickness: Precision micron (µm) layer measurement.
  • Adhesion: Bond strength of PVD/CVD or plating layers.
  • Coverage: Uniformity across deep ribs and blind holes.
  • Edge Condition: Prevention of build-up or thinning at corners.
Process Type Required Field Typical Test Common Failure Release Risk
Vacuum Hardening Final Hardness (HRC) Rockwell / Vickers Soft spots / Over-tempering Premature wear / Deformation
Nitriding Nitrided Depth (mm) Micro-hardness Profile Insufficient white layer Surface seizure / Galling
PVD Coating Layer Thickness (µm) Calo-test / X-Ray Local peeling / Flaking Friction increase / Corrosion
Hard Chrome Plating Thickness Micrometer / Magnetic Edge build-up / Pitting Dimensional interference

Why Combined Records for Mold Components?

High-performance mold inserts often undergo a multi-stage process: Vacuum Hardening for core strength followed by Nitriding or PVD Coating for surface endurance. Using a separate verification slip for each stage creates traceability gaps. A combined form ensures that the entire metallurgical history of a single Part ID—from its initial quenching cycle to its final surface layer—is captured in one document, preventing critical data loss during assembly or mold maintenance.

Common Recordkeeping Mistakes That Cause Traceability Gaps

Requirement Gap

Writing “Heat Treatment” Without a Measurable Target

Generic descriptions lack legal and technical weight. Reports must specify target HRC/HV ranges to enable objective verification during incoming inspection.

Data Gap

Recording Only “Pass” Instead of Actual Hardness or Thickness

A binary "Pass/Fail" masks process drift. Actual measured values are essential for tracking supplier consistency and analyzing tool life fatigue.

Traceability Gap

Missing Furnace Number or Supplier Batch Number

Without a furnace ID, it is impossible to perform a root cause analysis if multiple components fail simultaneously. This is the "ID card" of metallurgy.

Verification Gap

No Inspection Location for Hardness Test Data

Hardness can vary between the core and surface. Failing to document the exact test point makes the data unrepeatable and scientifically invalid.

Dimensional Risk

No Dimensional Recheck After Heat Treatment

Thermal stress causes unavoidable geometric changes. Releasing parts to assembly without a post-treatment dimensional log leads to catastrophic fit issues.

Compliance Gap

No Abnormal Closure After Supplier Rework

If a part is returned for re-tempering, the original record must be linked to a formal NCR closure. Untraced rework is a major audit non-conformance.

Process Confusion

Treating Coating and Nitriding as the Same Verification Task

Nitriding is a diffusion process (depth focus), while PVD is an additive layer (thickness focus). Using one logic for both leads to incorrect inspection methods.

Example Template: Field Layout for Outsourced Heat Treatment and Surface Treatment

Interactive Verification Table (Live Sample)

Component Name Required Hardness Actual Hardness Req. Case Depth Act. Case Depth Furnace No. Disposition
Core Insert 48-52 HRC 50.5 HRC N/A - VAC-20251012 Released
Cavity Insert 52-54 HRC 53.0 HRC N/A - VAC-20251012 Released
Slide Block 50-54 HRC 51.2 HRC 0.3 - 0.5 mm 0.42 mm NIT-88902 Released
Lifter Insert 54-56 HRC 55.0 HRC 0.05 mm 0.048 mm PVD-TiN-04 Released
Wear Insert 58-62 HRC 59.0 HRC 15 - 20 µm 12 µm CHR-5512 NCR-001
Example Abnormal Record (Traceability Gap Closure)
Issue Description: Thickness below lower limit (12µm measured vs 15µm required)
Supplier Rework: Stripping and re-plating performed on 2025-10-15
Re-inspection: 18 µm confirmed; Hardness 60 HRC verified.
Release Note: Approved for assembly by Tooling Eng. J.Doe

When a Simple Hardness Report Is Not Enough

Multiple Parts Processed in One Batch

Hardness slips often represent the average of a furnace lot. For high-precision mold sets, individual part verification is required to detect thermal gradient inconsistencies within the same batch.

Critical Inserts with Molding-Surface Risk

Hardness doesn't detect surface micro-cracks or decarburization. For Class 101 molds, inspection must include NDT (Non-Destructive Testing) or visual audit of the molding interface post-treatment.

Nitriding or Coating Layer Verification

Surface treatments are additive or diffusive. A bulk hardness test cannot verify if the nitrided white layer or PVD coating thickness meets the 12-20µm engineering specification.

Supplier Rework History Must Be Retained

If a component undergoes multiple tempering cycles to reach target HRC, the cumulative thermal history must be logged. Simple reports hide rework, which impacts the steel's long-term toughness.

Maintenance & Replacement Linkage

The inspection record must serve as the "Birth Certificate" for the component ID. This data is critical for root cause analysis when a part fails after 500,000 cycles in the field.

How This Form Supports Mold Component Traceability

01

Linking to Material Performance

By capturing the furnace batch and steel grade in one report, you bridge the gap between initial raw material properties and final hardness results, ensuring the data aligns with your mold material and performance list.

02

Integration with Incoming Inspection

This form acts as the primary gatekeeper. It provides the required vs. actual data points necessary to complete a high-standard mold component incoming inspection checklist before the part reaches the assembly floor.

04

Creating a Part History ID

Standardizing fields for drawing revision and supplier batch creates a permanent "Part History ID." This ensures that every core, cavity, and lifter has a verifiable digital twin, critical for long-term project traceability and spare parts management.

Who Should Own the Record: Tooling Engineer, QA, or Supplier?

Phase 1: Source Data

What the Supplier Should Complete

  • Original process logs (Time/Temperature curves).
  • Furnace and Batch ID correlation.
  • Initial surface hardness measurements.
  • Material certification (CoC) and steel grade verification.
Phase 2: Validation

What Incoming QA Should Verify

  • Cross-check hardness at specified locations.
  • Dimensional audit for thermal distortion.
  • Visual inspection for surface cracks or oxidation.
  • Review of supplier-provided documentation completeness.
Phase 3: Technical Review

What the Tooling Engineer Should Review

  • Impact of dimensional changes on mold fit-up.
  • Metallurgical suitability for specific molding resins.
  • Review of any Non-Conformance (NCR) rework history.
  • Verification of nitrided depth vs. wear expectations.
Final Accountability

Who Signs Final Release

  • The Tooling Engineer typically holds final authority for "Use-As-Is" decisions.
  • QA Manager signs for process compliance and traceability closure.
  • Release signifies the component is ready for final grinding or assembly.

Recommended Acceptance Logic by Process Type

METALLURGY

Vacuum Hardening / Quench & Temper

  • Hardness Verification Bulk Rockwell (HRC) measurement across 3+ points to ensure tempering stability.
  • Distortion Audit Verification of critical fitting surfaces against pre-treatment datum points.
  • Crack Detection Visual or MT/PT audit for thermal stress fractures in sharp corners or ribs.
  • Surface Condition Ensuring no decarburization or heavy oxidation on molding interfaces.
DIFFUSION

Nitriding (Gas / Ion)

  • Surface Hardness Micro-Vickers (HV) testing to confirm the hardness of the white layer.
  • Nitrided Depth Confirmation of effective case depth (usually 0.1 - 0.3mm) for wear resistance.
  • Uniformity Check Validation that deep ribs and cooling channel entries received consistent diffusion.
  • Fit Impact Re-verification of tight-tolerance shutoff surfaces (nitriding causes minor expansion).
ELECTROPLATING

Hard Chrome / Plating

  • Layer Thickness Magnetic or micrometer measurement of micron-level plating build-up.
  • Adhesion Integrity Bend or tape test verification to ensure zero risk of peeling under injection pressure.
  • Appearance Audit Inspection for pitting, "burnt" edges, or nodules on molding surfaces.
  • Polish Impact Confirming surface roughness (Ra) remains within mirror or texture specs.
FUNCTIONAL LAYER

PVD or Functional Coating

  • Precision Thickness Calo-test or X-ray verification of the 2-5µm functional layer.
  • Edge Coverage Confirmation of coating integrity on sharp cutting edges or shutoff corners.
  • Local Peeling Risk Audit for coating shadow effects in deep-hole or complex geometry inserts.
  • Wear-Surface Suitability Functional check to ensure low-friction properties (TiN, DLC, etc.) are uniform.

FAQ: Heat Treatment, Coating Thickness, and Traceability Records

What is the difference between a heat treatment report and an inspection report?

A heat treatment report is typically a process log provided by the supplier (e.g., furnace charts and hardness slips). An inspection report is a verification document completed by the buyer or QA team to confirm those results meet the specific mold engineering requirements before the part is released to production.

Should furnace number be mandatory on outsourced mold component records?

Yes. The furnace number is the core of traceability. It allows engineers to link a specific component to a precise thermal batch. If a part fails due to brittleness or cracking, the furnace number is required to audit the entire batch and prevent widespread tool failure.

How do you record nitrided layer depth on a mold insert?

Nitrided layer depth (or case depth) should be recorded as "Effective Case Depth" (ECD). This is usually measured via micro-hardness testing on a coupon or by using ultrasonic gauges, and should be logged in microns (µm) or millimeters (mm) alongside the surface hardness (HV).

How do you verify coating thickness on a polished cavity insert?

For polished molding surfaces, non-destructive testing (NDT) is mandatory. We recommend using X-ray fluorescence (XRF) or eddy current thickness gauges. This ensures the 2–5µm PVD coating is verified without introducing scratches or micro-abrasions to the mirror finish.

Can one form be used for heat treatment, nitriding, and hard chrome?

While the data requirements differ, a "Combined Lifecycle Form" is highly recommended for individual mold components. It ensures the entire metallurgical history—from core hardening to the final surface layer—is captured in one traceable ID, preventing data fragmentation.

What documents should the supplier return with processed parts?

A complete technical return must include: 1) Certificate of Conformance (CoC), 2) Original Hardness Slip, 3) Furnace Time-Temperature Chart, and 4) Coating/Plating Thickness Report if surface treatments were performed.

Should this form be linked to the mold maintenance file?

Absolutely. Linking inspection reports to maintenance files allows toolroom managers to track how specific heat treatment batches or coating types correlate with tool wear, helping to optimize service intervals and predict part replacement cycles.