In the world of precision manufacturing, "Trust, but Verify" isn't just a saying—it's a survival strategy.
For Medical Devices and Automotive Safety Parts, a material failure isn't just a warranty claim; it's a lawsuit. Yet, many buyers file the Mill Test Report (MTR) without even reading it.
What is a Mill Test Report (MTR)?
An MTR is a certified document from the raw material manufacturer (the steel mill) that proves the chemical and physical properties of the material batch.
Key Standard: EN 10204 3.1
Always ask for a "3.1 Certificate." This means the test results are validated by an inspection representative independent of the manufacturing department. A "2.2 Certificate" is just a declaration of compliance and is not enough for critical parts.
The 3-Step Verification Process
Step 1: Match the Heat Number
Every coil of steel has a unique "Heat Number" stamped on its tag.
The Check:
Does the Heat Number on the MTR match the Heat Number on the material tag photo sent by your supplier? If they can't send a photo of the tag, be suspicious.
Step 2: Check the Chemistry
Don't just look for "Pass." Look at the elements.
The Check:
Step 3: Verify the Mill
Is the manufacturer a real, reputable steel mill (like Baosteel, TISCO, POSCO)?
The Check:
Google the mill's name. If the MTR looks like a Word document made by a trading company, reject it.
Shengjie's Traceability Promise
We understand that for our Medical and Automotive clients, traceability is non-negotiable.
- We only buy from Tier 1 mills (Baosteel, TISCO).
- We provide EN 10204 3.1 Certs with every shipment.
- We archive material samples for 5 years.
- We have an in-house XRF Analyzer to verify composition on arrival.
Auditing a Supplier?
Download our sample MTR and Traceability Procedure to see what a "Gold Standard" quality package looks like.
Request Quality Sample Package