Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
(OP)
I have been performing mechanical test on speciments from the actual product to verify mechanical properties of WCB cast parts. About 50% percent of the test results were lower than ASTM A216 WCB requirements. (within 10%)
I tested the foundry samples for the same heats and found all of them within the ASTM requirements.`Samples from foundry have been in the same heattreated.
Cross section of the parts that they fail the tensile test does not show any indication of local casting void which may lower the mechanical properties.
Micro edge test performed on each parts and all of them are ok. ( meets heat treatment requirements)
Both elongation and reduction area is within ASTM A216 WCB requirements.
Please let me know if it is OK to have lower mechanical properties on the actual product testing. Is there any technical article which explains the reasons, or if any body had similiar experience.
Thanks
I tested the foundry samples for the same heats and found all of them within the ASTM requirements.`Samples from foundry have been in the same heattreated.
Cross section of the parts that they fail the tensile test does not show any indication of local casting void which may lower the mechanical properties.
Micro edge test performed on each parts and all of them are ok. ( meets heat treatment requirements)
Both elongation and reduction area is within ASTM A216 WCB requirements.
Please let me know if it is OK to have lower mechanical properties on the actual product testing. Is there any technical article which explains the reasons, or if any body had similiar experience.
Thanks





RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
ASTM A703 stated product testing acceptance criteria shall be agreed between manufacturer and customer, but no tolerance is given.
RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
Point raised by Roberts is also well discussed in this publication. You can download for free.
RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
RE: Tolerance on Mechanical (Tensile/Yield) Product of WCB test results
I want to review as many as possible technical documentation about this subject so that I can come up with a reasonable solution (technically sound) for both the foundry and for me and for my customers. Otherwise foundry would tell me it is OK as it is , end-user will require to meet ASTM minimum mechanical values.
I will be downloading and review the file form www.sfsa.org web-site as arunmrao suggested.
Please let me know if there is any other technical document that MIGHT BE HELPFUL.