Cute Young Brunette Girl Shows Off At The Iron Pipes

Manufacturing standards for pipes commonly require a test of chemical composition and a series of mechanical strength tests for each heat of pipe. A heat of pipe is all forged from the same cast ingot, and therefore had the same chemical composition. Mechanical tests may be associated to a lot of pipe, which would be all from the same heat and have been through the same heat treatment processes. The manufacturer performs these tests and reports the composition in a mill traceability report and the mechanical tests in a material test report, both of which are referred to by the acronym MTR. Material with these associated test reports is called traceable. For critical applications, third party verification of these tests may be required; in this case an independent lab will produce a certified material test report(CMTR), and the material will be called certified.
Some widely used pipe standards are:
• The API range - now ISO 3183. E.g.: API 5L Grade B - now ISO L245 where the number indicates yield strength in MPa
• ASME SA106 Grade B (Seamless carbon steel pipe for high temperature service)