Recent content by alanisphoenix

Hello, few years ago during an API audit, the Auditor told us that is important to do the marking sequentially as is at point 11.2 of the standard. Now one client is asking about marking the dimenison in SI and USC. As i undestand i have to mark: 1- name of manufacture 2- Api Spec 5L(and other...

Hello, i have a question about the annex relative to Magnetical Particles. According to API 5L the standards to use are ASTM E709 or ISO 10893-5 ASTM A709--> Has not acceptance criteria ISO 10893-5 > have 3 levels, M1, M2, M3 and says specifically that the magentical particles (point 6.2) is...

Hello, i'm studying API 5CT K55 pipes for coulpling stocks, and i have a doubt about marking. table C.48 On the heat treatment is written Z and N&T. I suppose N&T is normalizad and tempering, but what about Z? it is Normalized? i can not found the meaning of Z anywhere on the standard. At...

Hello, i´m reading some specification for P22 and P11 (ASTM A335) where the client is asking for impact test at -29ºC (for P22)and -36ºC (for P11). We have carried out some test and it seems to me that these grades are in their limit of the trasnsition curve. I have obtain values less than...

THANK YOU to all of you for the info. The link seems to me very interesting.

Hello, on last editions of ASTM A335 is include a new grade called P93. I can see that have Co and Nd (neodimio?) Anyone knows the use for this new grade? it looks so different from the P91 and P92, so i really don't know what kind of industries needs this new material with Co=2.5-3.5% Really...

How is the steel being made? electric arc furnace - seamless pipes How is it being deoxidized? Al-Si fully killed You stated that the heat treatment is normalized. Is that per the clients specification? yes What mechanical properties are you trying to achieve? Tensile/Yield and impact. Yield...

ironic metallurgist yes you are right..but it is a cliente requirement S=0.020-0.030.. i know S is not good for impact test.. that's why i have to do something to minized the Sulfur. V>0.12 is also a requiremet.. i can not do nothing with it. The standards always are wide in composition I have...

Hello, For a carbon steel, how elements /structure is the best to obtein a good impact test result at -20 / -40ºC. We melt a steel with target values aroung C=0.20 Mn=1.50 Si<0.30 V=0.12 after normalizing (ferrite and perlite with a grain size around 9) but the impact test at -20ºC is not more...

i will follow your instructions.. i tell you about the results in few days. tahnk you!

ok metengr i will do some test normalizing at 850ºc, and tempering at 610ºC. Do you think that quenching (and tempering)the samples i will obtain better values for thick wall thickness? thank you so much for your help and for sharing your knowledge

we have problems with wall thickness higher than 0.5 inch (12.5mm) We are doing now a normalizing at 1680ºF (coling by still air) and tempering at 1130ºF (cooling by still air). i know that some years ago we did only normalizing, but i can not find enough information to know why we decide to...

Thank you for your quick answer! yes tempering at 600ºc, after normalizing. ASTM A333 gives too many options... we had problems also with the normalizing, so we decide to do Normalizing+tempering , but the values are quite close to the minimum and even sometimes lower that 14j so i'm trying to...

Hello, which is the usual heat treatment for the grade 3? i'm doing some tests with the samples normalized and tempering, but the impact test values at -101ºC, are quite low (about 5 to 12 j) Any idea to increase this values? Maybe adding more Nickel to the steel? the Ni on the heat is quite...

Hello, i'm new in API 5CT so i have some doubts about some points. Looking at the tables of the annex C(example table c.10) first column is "Label 1" what that means? i suppose it is the OD. If it is the OD we have to extrapolate the values for other OD not mention there? And talking about...