SBS - The best value in QMS software

Heat Number on CofC - Stainless steel tube

G

Graham1967

#1
Hi,

I have recently come across a problem with stainless steel tube that failed tensile testing, but the supplied mill certs stated it was within spec.

I was looking at a cofc from a different metal supplier, for the same material, but were actually from the same mill. Although 2 years apart the heat number of the mill certs were the same, but had a different batch number.

When I checked the chemical composition of the two mill certs they were exactly the same, but showed significant differences between the mechanical tests.

Questions are,

Can the same heat number be in different batches of material?

If a material is of the same chemical composition is it possible to get different mechanical test results?

Do mills keep back material for such instances where the validation of the results can be checked at a later date?

Thanks

Graham
 
Elsmar Forum Sponsor

Sidney Vianna

Post Responsibly
Staff member
Admin
#2
Chances are you have a counterfeit material with a counterfeit certificate. If you got the material from a distributor, you might want to reach out to the mill themselves and verify the two certificates. Certainly you can have material with the same chemical composition and different mechanical properties. That's achieved via refining the metallurgical properties of the steel through a series of processes. For stainless steel, the possibility of heat treating is not as much as carbon steel, but it still can be done, depending on the grade of the stainless steel.

There is a reason why counterfeit detection and avoidance is becoming an issue of quality management system standards in higher risk industries.
 

CCaantley

Involved In Discussions
#3
We just ran into a huge issue with a falsified material cert. A product we produce requires 304L stainless (less that .03% carbon) which the cert said, but after several failures at our customer, a chemical analysis was performed and it was found to be 304 stainless at .06% carbon. Huge headache, physically and financially.
 
Thread starter Similar threads Forum Replies Date
E 60950-1 resistance to abnormal heat test Various Other Specifications, Standards, and related Requirements 0
D Risk Analysis using Monte Carlo Simulation instead of Scoring and Heat Map Risk Management Principles and Generic Guidelines 2
S Heat Sealers Upper and lower limit setting during OQ for Heat Sealer Qualification and Validation (including 21 CFR Part 11) 0
R MSA studies for Heat Treatment Equipment Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
K Calculating Heat Dissipation Manufacturing and Related Processes 1
B API Q1 5.7.1.5 Process Validation - Machining, heat treating, Manganese Phosphate and Zinc Plating Manufacturing and Related Processes 2
K Moist Heat Sterilization worldwide Requirements and Regulations Other Medical Device Regulations World-Wide 1
D Minor non-conformance for not receiving a CofC from a heat treater Manufacturing and Related Processes 10
T Heat treat test dimple Manufacturing and Related Processes 3
X Heat Treat - Verifying mechanical properties on heat treated material per the ASTM Manufacturing and Related Processes 6
Ron Rompen The Effect of Heat on Production and Quality Human Factors and Ergonomics in Engineering 14
S Performing PQ on a Small (tabletop) Air Heat Treating Oven ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
M API 6D-2014 24th Ed. Pto 6.10 - Heat Treatment Equipment Qualifications Oil and Gas Industry Standards and Regulations 4
H Standards to use for Propylene Glycol Heat/Cooler Fluid in a Device RoHS, REACH, ELV, IMDS and Restricted Substances 2
C Practical use of Heat Input calculation for Manual MIG Welding Manufacturing and Related Processes 4
S Heat Treatment - Soaking time interpretation Manufacturing and Related Processes 5
S Industrial Aseptic Bag Heat Sealing Sampling and Qualification Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
E CQI 9 (Heat Treatment) Assessment Requirements - Company and Customer Requirements Customer and Company Specific Requirements 1
S Paperless Temperature Recorder for Temperature Surveys on Heat Treatment Ovens General Measurement Device and Calibration Topics 6
I AS9100 PPAP requirements for outside Heat Treat vendors/suppiers AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 9
G SPC in Heat Treatment Workshop Statistical Analysis Tools, Techniques and SPC 2
S AMS 2750E Heat Treat Furnace System Accuracy Test SAT Report question AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
S Heat Map ISO/TS 16949:2009 Clauses IATF 16949 - Automotive Quality Systems Standard 1
M AMS2770 Aluminum Heat Treat - Determining Soak Time Various Other Specifications, Standards, and related Requirements 1
S Thermal Sensitivity Testing - Heat Lamp - ILY - Increased blood circulation IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
F Heat and Moisture Oxygen Port Changes Classification 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 4
J ISO 17665-1 & 2 Review and approval of validation (of moist heat sterilizers) Other ISO and International Standards and European Regulations 3
Q Heat Treat Steel, Rockwell C - Variability in Complex Machined Shapes Manufacturing and Related Processes 7
M Who Stole our Nevada Heat Coffee Break and Water Cooler Discussions 7
J FAI for Heat Treated Details - Inco Parts Shrink AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
W IR Camera - Heat Survey of parts during dynamic testing General Measurement Device and Calibration Topics 5
P NADCAP Certified - Heat Treat Continuous Belt Driven Oven question AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 3
A NADCAP AC 7101/03 Heat Treatment Process Acceptance Tests AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
V Is there a Heat Treat certification that is required at PPAP? APQP and PPAP 4
R CQI-9 Heat Treat Assessment Services recommendations wanted IATF 16949 - Automotive Quality Systems Standard 3
V Is the CQI-9 Heat Treat Assessment performed by a 3rd Party Auditor APQP and PPAP 1
J CQI-9 Table E, 4.1 - Heat Treating Process Requirements Other ISO and International Standards and European Regulations 2
S Special Gages for Measuring Pre-Heat Treat Thread Size Measurement Uncertainty (MU) 3
R Fuses that in series with each supply lead are only housed by Heat Shrink Tubing IEC 60601 - Medical Electrical Equipment Safety Standards Series 12
J Impact of 17-4 PH Heat Treating the same material twice Manufacturing and Related Processes 7
V CQI-9 Heat Treat System Assessment Other ISO and International Standards and European Regulations 11
V Issue: Suppliers charge for complete Level III PPAP package - Heat Treated Parts APQP and PPAP 16
V What should I require of a Heat Treat PPAP? Surface Hardness per SAE J664 APQP and PPAP 1
R CQI-9 Heat Treatment Process Table C question IATF 16949 - Automotive Quality Systems Standard 3
K Heat Treatment (Softening) on Cast Iron before it can be drilled to form Thread? Manufacturing and Related Processes 4
Sam Lazzara Bar Sealer vs. Impulse Sealer for Medical Pouch Heat Sealing Qualification and Validation (including 21 CFR Part 11) 4
S Applied Part Classification for Mattress for Radiant Heat Warmer IEC 60601 - Medical Electrical Equipment Safety Standards Series 19
R A way to verify 7075 T0 Aluminum has been successfully Heat Treated to T6 Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
L Plug Gages and Tapered Holes - Compensation for Heat Treat Distortion General Measurement Device and Calibration Topics 1
L Heat Treat Calibration Records - API 6a sec 5.8 and annex M Requirements Oil and Gas Industry Standards and Regulations 3

Similar threads

Top Bottom