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2ndchild (Petroleum)
27 Aug 05 6:06
hi,
The Yield strength of the ASME A106 Gr B is 240MPa (35ksi)at 120C (250F)or less???
regards
Helpful Member!  metengr (Materials)
27 Aug 05 12:38
Less. Published value is 31.5 Ksi at 250 deg F (ASME Section II, Table Y-1).
Helpful Member!  FIF99 (Materials)
29 Aug 05 4:42
Hi,
Agree with Metengr, but note that the relevant EN material standards also presribe hot yield values.
In case you perform calculation to the EN you must use these properties.
If ASME B31.3 applies, you should use the design stress values out of table A-1.
For A106-B the design stress of 20ksi is constant thru a design temp of 400 degr.F.
Succes!

Regards.
2ndchild (Petroleum)
31 Aug 05 2:19
hi,
do you know the values of the design stress given by EN material standards?
thanks.
ijzer (Materials)
31 Aug 05 4:57
For A 106 B ,you can find the yield strengths at temperature in ASTM A 520.
FIF99 (Materials)
31 Aug 05 5:27
Hi,
If you have to comply with the ASME code, than you should use the properties from ASME Section II table Y-1 as indicated by Metengr. Note that the ASTM A520 is superseded and no longer valid.

If you have to comply with the EN (which seems to be the case) you should purchase A106-B dual certified to EN 10216-part 2 in material grade P265GH (1.0465) for which you can find the Hot Yield values in Table 5.
For Wall thickness <=60mm; Rp02 (i.e. Hot Yield values):
100 degr.C - 226Mpa
150 degr.C - 213Mpa
200 degr.C - 192Mpa
250 degr.C - 171Mpa
300 degr.C - 154Mpa

Regards.

abbver98 (Mechanical)
31 Aug 05 6:56
Leyla,
Take care when using ASTM material for EN code (like EN-13445 or EN1380):
-Material certificate : generally 3.1.B (equivalent to an actual certificate) is the common certificate depending in the equipment risk and category. Sometimes 3.1.C could be required.
-Sometimes impact test is required
-To have allowable stresses you should use Tensile and yield strength. Note that EN yield strength = Rp0.2 and ASTM yield strength = ReH (for carbon steel). The difference between the two values is about 10 MPa in some cases.
-In EN standards the %C should be limited to 0.25 in product and %CE to 0.43 (in ASTM it's limited respectively to 0.35 and 0.49)
-EN-MDMT is -10°C for carbon steel while it's -29°C in ASTM/ASME whithout taking into account thickness.
-........
FIF99 (Materials)
31 Aug 05 7:21
The additional material requirements should indeed be noted. These are often specified within client specifications (end user) as well as the applicable design code, like ASME B31.3 or EN 13480 as a minimum.
Also the method of design stress determination, by using Tensile, Yield or Hot Yield together with assessment of safety factors are stipulated in the relevant Design Code.
Further on abbver98's statement to take special care for correctly specifying the ASTM materials, if to be purchased according EN standards, should be taken.

Regards.

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