A Mill Test Report (MTR), often also called Mill Test Certificate (MTC), Inspection Certificate or Certificate of Test, is a quality assurance document (issued by a manufacturer, or mill, to a distributor, stockholder, reseller or end user) that certifies the features of a product, its compliance to the applicable norms and standards (example API 5L for pipes) and, its chemical, physical and mechanical properties. Typically, European mills issue mill test certificates according to the EN 10204 standard.

 

MILL TEST CERTIFICATE CONTENT

Mill test certificates to EN 10204 generally show the following content:

  • Type of certificate and standard (example EN 10204 3.1 or EN 10204 3.2)
  • Manufacturer name
  • Product name and dimensions
  • Quantity covered by the certificate (example: tons, with heat numbers)
  • Heat numbers and batch number (physically shown on the product as well)
  • final test result
  • Dimensional measurements, to check compliance with allowed tolerances (example, for steel pipes: diameter, wall thickness, length, straightness)
  • Material grade and applicable specification, including results of chemical and mechanical tests
  • Results of additional tests, like hydrostatic, ultrasounds (UT), hardness, impact test, magnetic particles, metal graphic result etc.
  • Addenda useful to appraise the full features of the product

pipe mill test certificate 3.1

Sample mill test certificate (Tenaris steel pipes).

 

TYPES OF MILL TEST CERTIFICATES (EN 10204 2.1, 2.2, 3.1, 3.2)

Certificate denomination in…
MTC Type
EN 10204
English German French Scope MTC to be validated by…
MTC Type 2.1 Declaration of compliance with the order Werk-
Bescheinigung
Attestation de conformité á la Commande Statement of compliance with the order The manufacturer
MTC Type 2.2 Test report Werkzeugnisse Relvé de contrôle Statement of compliance with the order by the manufacturer based on non-specific inspections (tests) by the manufacturer. The manufacturer
MTC Type 3.1 Inspection certificate 3.1 Abnahmeprüf-
Zeugnisse 3.1
Certificat de réception 3.1 Statement of compliance with the order by the manufacturer with results of a specific inspection The manufacturer`s authorized inspection representative, independent by the manufacturing department
MTC Type 3.2 Inspection certificate 3.2 Abnahmeprüf-
zeugnisse 3.2
Certificat de réception 3.2 Statement of compliance with the order with indication of results of a specific inspection
  • The manufacturer`s authorized inspection representative independent by the manufacturing department
  • Either the purchaser`s authorized inspection representative or athird-partyy inspector

 

EN 1024 3.1 MILL TEST CERTIFICATES

Certificate type Title Summary of EN10204 requirements Notes
3.1 Inspection certificate Statement of compliance with the order by the manufacturer with results of specific inspection Replaces 3.1B. Common certificate type issued for ‘batch tested’ material. Cert. issued and signed by manufacturer’s representative, who must be independent of the manufacturing department. Eg Inspection department or test house manager/supervisor.
3.1A Inspection certificate 3.1A With a mention of test results from specific inspection and testing Batch test results. Cert. issued by independent inspector required by releasing authority (eg TUV for German pressure vessels). Replaced by 3.2 in 2004
3.1B Inspection certificate 3.1B With a mention of test results from specific inspection and testing Batch test results. Cert. issued and signed by manufacturer’s representative. Replaced by 3.1 in 2004
3.1C Inspection certificate 3.1C With a mention of test results from specific inspection and testing Batch test results. Cert. issued by an independent inspector appointed by a customer (eg Lloyds). Replaced by 3.2 in 2004