Manufacturers issue a Material Test Report, or Mill Test Report, to validate that the product meets the chemical analysis and mechanical properties specification. The MTR will contain all relevant data to the product and will accompany the product through its lifecycle.
The following are typical parameters that may be recorded on an MTR:
Chemical composition including carbon content, alloys, and sulfur
Material size, weight, identification, and grade
Material heat number, which ties back to the processing batch
Mechanical properties like tensile strength, yield strength, and elongation
BS EN 10204:2004 is British Standard that related to different types of inspection documents for steel metal products. There are 4 types for EN 102024, 2.1, 2.2, 3.1 and 3.2, the later two types are the mostly used in steel pipe and plates products, so here we will mainly introduce the major differences between two types.
Looking for an EN10204, 3.2 Certification?
EN10204 is a Euronorm (issued by the European Community) specification that describes different types of material test reports and certifications. The standard contains no requirements relative to actual material requirements. The most common reference is to a 3.1 type certification (3.1 is the paragraph number within EN10204 that describes the content). A 3.1 certification is simply the common mill test report that reports test results on the lot of material in question, performed by a laboratory (often operated by the mill itself) that is independent of the personnel actually producing the material. Sending samples to an independent laboratory for testing to the ordering specifications will still result in a 3.1 certification. It is just being tested by a second source.
Differences between EN 10204-3.1 and 3.2 for the MTC
EN 10204 contains 4 types of document type, 2.1, 2.2, 3.1 and 3.2. Type 2.1 and 2.2 are validated by the manufacturer. Type 3.1 and 3.2 are not only validated by manufacturer.
- Type 2.1, The content is statement of compliance with the order. Validated by manufacturer.
- Type 2.2, Statement of compliance with the order, with indication of results of non specific inspection. Validated by manufacturer.
- Type 3.1, Statement of compliance with the order, with indication of results of specific inspection. Authorized inspection representative by the manufacturer, but is independent of the manufacturing department.
- Type 3.2, Statement of compliance with the order, with indication of results of specific inspection. Authorized inspection representative by the manufacturer, independent of manufacturing department and either the buyer’s authorized inspection representative or the inspector designated by the official regulations.
EN10204 defines a 3.2 certification as a: “Document prepared by both the manufacturer’s authorized inspection representative, independent of the manufacturing department and either the purchaser’s authorized representative or the inspector designated by the official regulations and in which they declare that the products supplied are in compliance with the requirements of the order and in which test results are supplied”.
I have contacted several European Authorized Bodies in the US that provide 3.2 certifications. All responded by saying that a true 3.2 certification is not possible for material that is stocked to commercial standards without a 3.2 certification issued by the mill at the time of delivery. Their interpretation is that only a mill can issue a true 3.2 certification. They can do so when the testing has been witnessed at the mill by an Authorized Body.
EN 10204-3.1 type quality certificate.It requires the manufacturer to show the actual test result for the steel pipes on sale. According the related standard sampling methods.
3.1 MTC requires the test agency shall be an independent party, mill has no rights to revise the test results.If a steel pipe manufacturer passed the audit for the ISO 9001 from a certification agency of European Union, then this manufacturer have the qualification to release the EN 10204-3.1 MTC. The buyer information shall be specified on the MTC quality certificate, and one buyer need one MTC quality certificate. If the manufacturer didn’t pass ISO 9001 or the ISO 9001 certificate not from European Union Inspection Agency, then the manufacturer do not have right to release MTC of EN 10204-3.1. In this case, manufacturer shall apply for the EN 10204-3.2 quality certificate from the third part of inspection agency.
EN 10204-3.2 type quality certificate.EN 10204 3.2 certificate is the most restrict standard level for the steel pipe products.It indicates the certification shall be additional countersigned and verified by independent related all the tests, 3.2 certificate cost higher than 3.1. Not only manufacturer test department, but also a completely independent part. Third party inspector, or the personal, buyer, or government’s representative also have right to verify the test results.
EN 10204-3.2 certificate must released by the inspection agency that authorized by the European Union. Through the related inspection or the test for the material that ordered, to certify that the test result is the same with the PO from a third party inspection agency. Also on the quality certificate of EN 10204-3.2 shall specify the name of manufacturer and the buyer.
EN 10204 certificate related steel pipe MTC in following specs.
- Chemical composition
- Mechanical strength
- Impact strength
- Tensile strength
- Hardeness test
- Bend test
- Visual and Dimensions
- Hydro test
- NDT test
- Magnetic test
- Pipe end
- Corrosion HIC status
- Heat no