ASME Section II Part A
ASME Section II Part A
(OP)
A material specification table that indicates the Yield to be reported in 2:, and the production part is too small to yield a standard sized specimen, are sub-sized tensile specimens as defined in SA-370 prohibited?
If yes please site the paragraph reference chain.
If no please site the paragraph reference chain.
If yes please site the paragraph reference chain.
If no please site the paragraph reference chain.





RE: ASME Section II Part A
RE: ASME Section II Part A
For example:
1) A/SA-540: The strength TABLE has the elongation in 2", however, there is a paragraph in the A/SA-540 Standard that indicates that production pieces may be used (under certain conditions).
2) A-962: Paragraph 8. Mechanical Properties references A370 and also establishes specimens shall be obtained from the production material.
In both of these instances lets say 3" nuts are to be made which have a height (length) of approx 3". When a production piece like this is used the elongation cannot be measured in 2".
RE: ASME Section II Part A
16.1 A discard equivalent to the diameter of the bar
when heat treated as a solid or a discard equivalent to the
wall thickness when heat treated as a seamless tube, bored
bar, or hollow forging shall be taken prior to removal of
test coupons.
16.1.1 When production pieces are not of sufficient
length to permit removal of test coupons in accordance
with 16.1, the mid-length of the specimens shall be at the
mid-length of the production pieces selected for destruction
to provide test coupon material. The production pieces
selected for test shall be identical with respect to the
quenched contour and size except for length which shall
equal or exceed the length of the represented production
pieces.
RE: ASME Section II Part A
16.1.1 When production pieces are not of sufficient length to permit removal of test coupons in accordance with 16.1, the mid-length of the specimens shall be at the mid-length of the production pieces selected for destruction to provide test coupon material. The production pieces selected for test shall be identical with respect to the quenched contour and size except for length which shall equal or exceed the length of the represented production pieces.
A 3" nut production piece would allow a standard 10mm x 10mm x 2" charpy specimen. What is the size of the tensile test specimen for a 3" nut production piece?
RE: ASME Section II Part A
RE: ASME Section II Part A
Sub size specimens in A-370 are proportional to the .505 2" gauge length size specimens to assure the results are basically the same regardless of the size of the specimen: Yes / No ?
RE: ASME Section II Part A
RE: ASME Section II Part A
RE: ASME Section II Part A
ASTM A 370 Note 4 indicates that the gage length for a subsize specimen must be 4X the diameter for a subsize round specimen. The elongation results are comparable to a standard specimen. Comparable does not mean equivalent and for subsize should be reported as 1" gage length for comparison, not 2" gage length.
RE: ASME Section II Part A
If a sub-size specimen does not render similar results as a full-size specimen then I would believe the A-370 and E-8 Standards would prohibit their use. ASTM E-8 (2001) Table 8 Note 5 indicates that "The use of specimens smaller than 0.250-in. diameter shall be restricted to cases when the material to be tested is of insufficient size to obtain larger specimens or when all parties agree to their use for acceptance testing." However it does not prohibit .350 or .250 round specimens.
RE: ASME Section II Part A