Hello All,
I have noticed that in reading through different specifications API has no qualms about using the term “Sour Service”. Likewise, it is a term that is used industry wide (oilfield) as an indicator that MR0175 should be consulted during the material selection process.
On the other...
Hi all,
I have a customer who has specified the above heat treatment procedure for some forged material. I am interested in getting some opinions on what purpose the normalizing might serve. We typically only preform the latter three heat treatments and end up with a product with good...
Hello All,
I am trying to establish minimum acceptable and minimum average Charpy impact values (ft-lb) for AISI 4140 at -50F.
The material will be Normalized, austenitized, quenched, and tempered. It should have approx. UTS of 115 ksi, YS of 99ksi, and hardness around 21 HRC.
The material...
Hello All,
I am faced with the issue of joining 2 large peices of nickel plated steel together in a sub sea environment, and I need help with an appropriate choice of bolting material. My first thought was Duplex SS, but I am not sure where duplex actually falls in the galvanic series in...
Hello All,
I am wondering if the ferrite present in most CF8M castings helps it to resist chloride induced SCC better than it's wrought counterpart 316SS. I am thinking that its probably too small of a ferrite to austenite ratio to matter, or if it does make a difference then the difference is...
Hello All,
I am trying to select an appropriate materal for the construction of flanged ball valves to be used under the following operating conditions:
Crude Oil & produced water
150 psig max pressure
0-130F temp range
120,000 - 180,000 ppm chlorides
Nil - 300 ppm H2S (hot spots up to 3000...
Looking for some feedback on the attached file. Both pictures are from the same heat treatment lot, and the same parent material, and yet the microstructures differ quite a bit in appearance. Does anyone have any input as to why this might occur, and if this type of variation between samples...
Is there any way to tell if a carbon steel casting, A216-WCB in this case, has been supplied in the fully killed condition just by looking at an MTR?
There are maximum limits in the ASTM spec for Si (0.6% max)and Mn (1.0% max), which, as I understand it, are elements used to kill steel. Is...
