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Quality

The proof is the record.

Heat treatment cannot be seen in a finished part. So every charge is logged, every lot is sampled, and nothing leaves until 12 release checks pass and the report is signed.

AS 9100D

Standard
Quality management systems for aviation, space and defence
Status
Certified
Includes
ISO 9001:2015 quality management systems
Status
Certified

Release

12 release checks before a report is released.

A check that could not run has not passed. If a quench time was never recorded, the lot waits until it is.

The same checks run in our production system for every lot.

Example lot · illustrative 12 / 12 passed Report released
Release checks run on every lot
CheckBefore release, confirm that…Result
EV01Every process step is recordedpass
EV02Steps are in a possible orderpass
TM01Quenched to tempered inside the window (≤ 4 h)pass
TM02Hardening soak as specifiedpass
TM03Temper soak as specifiedpass
QA01Sampling plan satisfied (WI-15)pass
QA02Every reading inside specificationpass
QA03Capability against the specificationpass
QA04Effective case depth determinedpass
QT01Count out matches count inpass
QT02Charge within the furnace limitpass
SG01Signed by an authorised personpass

Documented system

Planned before the first part goes in.

  • Process flow diagram for each part and process.
  • PFMEA identifying what can go wrong in each operation and how it is prevented or caught.
  • Control plan listing what is measured, how often and against what limit.
  • Jigging work instructions so a part is loaded the same way every charge.
  • Process inspection record for each lot, operation by operation.
  • Process monitoring sheet and daily work management review on the floor.
  • Inward, in-process and final inspection tags that travel with the lot.
  • Test report signed before despatch.

Test report

What a STEP test report tells you.

An illustrative report: layout and values show what is recorded, not a real part.

Heat treatment test report

Lot 0417 · CHT

STEP

Illustrative

Part
Pinion shaft
Material
20MnCr5
Quantity
1,200 pcs
Furnace
SQF-2 → TFC-1
Carburise
900 °C · CP 0.98 %
Temper
180 °C · 90 min

Surface hardness

SpecSample 12345
59–61 HRC6060616059

Case depth · microhardness traverse

Depth mm0.10.30.50.70.9
HV1712688631574512

ECD at 550 HV1: 0.78 mm · spec 0.6–0.9 mm

Core hardness

38 HRC · spec 35–45 HRC

Microstructure

Case: fine tempered martensite, retained austenite < 10 %, fine spheroidal carbides. Core: tempered martensite, ferrite < 5 %.

12 / 12 checks passedSigned · authorised person
  1. Surface hardnessReadings on samples drawn to the sampling plan, against the band on your drawing.
  2. Case depthA sectioned sample traversed with the Micro Vickers. Effective case depth is where hardness falls to the limit.
  3. Core hardnessMeasured on the section, away from the case.
  4. MicrostructureCase and core, described in words you can hold us to.

Aerospace readiness

What is in place, and what is not claimed.

We are AS9100D certified, the aerospace quality management standard, which includes ISO 9001:2015. Thermocouples are calibrated to AMS 2750, the pyrometry specification aerospace heat treaters are audited against. This table will change as approvals are earned, not before.

Aerospace readiness
RequirementStatus
Pyrometry to AMS 2750in place
Traceability per lot, operation by operationin place
Signed test report per lotin place
AS9100D quality management (includes ISO 9001:2015)certified
Nadcap heat treating accreditationnot claimed

Next step

Audit us.

Quality engineers are welcome at the works. Ask for a visit, or request a quote and we will send sample documents with it.

Request a quote Arrange a visit