How to Read an MTC 3.1: Decoding Chemical Analysis and Mechanical Testing
1. What is a Mill Test Certificate (MTC) 3.1? Governed by EN 10204, a 3.1 certificate is a document issued by the manufacturer (independent of the production department) certifying that the products comply with the order requirements.
2. Essential Data Points
- Chemical Composition: Heat analysis of Carbon, Manganese, Silicon, etc. (Must meet ASTM/ASME limits).
- Mechanical Properties: Yield Strength, Tensile Strength, Elongation, and Hardness.
- Heat Number: The “DNA” of the steel. This number must be physically stamped on every flange or pipe.
Related Articles
-
July 29,2026Welding vs. Grooving: Why Modern Commercial Projects are Switching to DTC Grooved Systems
The Labor Cost Revolution In the US and European commercial construction markets, labor is the single highest expense. Welding a 6-inch fire main requires a skilled welder, fire permits, and significant time. 1. 3x Faster Installation A DTC grooved system can be installed 3 to 4 times faster than a …
-
July 29,2026An Introduction to Grooved Piping Systems: Speed, Flexibility, and Vibration Dampening
1. The Grooved Concept Instead of welding or threading, a groove is rolled or cut into the end of the pipe. A Grooved Coupling (containing a C-shaped gasket) is then bolted over the two pipe ends to create a seal. 2. Rigid vs. Flexible Couplings Rigid Couplings: Create a joint that behaves like a we …
-
July 29,2026Avoiding the “Paperwork Trap”: Why DTC Conducts Independent PMI and Hardness Testing
The Risk of Document Fraud In the global PVF market, a certificate is only as good as the company behind it. Unfortunately, “paperwork-only” suppliers often pass off inferior materials with forged MTCs. 1. Positive Material Identification (PMI) At DTC, we don’t just trust the mill; …