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Dear Experts We are high pressure injecting Aluminum Grade ADC12. The part is 30cm x 30cm x 1.5 cm (ht). Injection pressure is 150 bar. Once injected we rough grind the surface and then send for sand blasting. After sand blasting we are not getting a uniform appearance on the surface. Near...

Sound advice. Thank you.

Thank you metengr and EdStainless. Is there a standard for this PWHT? We will be outsourcing the heat treatment but this company has asked us to provide the procedure. Some research and we've found around 630 celsius for 5 minutes but this is too vague.

Hello Everyone, I need to weld a ring onto the surface an L-80 13Cr Sumitomo casing. There is a pre-weld heat treatment required and also a PWHT (post weld heat treatment). Can anyone explain the procedure and some of the science behind the PWHT. If it's any help, the end product is a sand...

metengr thanks for your reply. I have to try and keep it as simple as possible. I've had the following advise from a German friend who has worked in the oil screen business and is now retired. Unfortunately he's on a motorbike tour of Europe so his access to information is limited. Here's...

I would like to calculate the collapse strength and tensile strength of an API casing which has been perforated over 16% of it's surface as per the following: API 13 3/8", K-55, 54.5 PPF, Range 3, BTC. Perforated with 5/8" holes uniformly positioned across the length and circumference of the...

I have a question not related to this post that perhaps some of you can help me with. How can I calculate the tensile strength and collapse strength of the following?: 13 3/8" API casing, 54.5 PPF, K-55, Range 3, perforated on 16% of it's surface area with uniformly spaced 5/8" holes.

Thanks Edstainless for your helpful reply. I had looked up clause 14 in the ASTM specifications and read about the workmanship but did not find any indication of the figure .005". The grind marks are well within this range. Can you refer me to the page which refers to this depth of grind...

I am producing pins (male fittings on extension pipes) for a job in Libya. The raw material is Chinese manufactured seamless SS304L, 6 5/8" casings. My problem is, when they have score lines inside the casings from the mandrel, they do rotational grinding to make a uniform inner diameter...

Hello Everyone Just when I thought all was well the grey wire reared it's ugly head again. Problem, the cleaning process is not sufficient, still some hydraulic oil left on the surface when it's sent for annealing. I need a good solvent that can be used inline. Any suggestions? For reference...

Thanks EdStainless! Can you give me any more details on the hot alkaline cleaning? We're running the wire through some solvents now but I still worry about small amounts of contamination.

Ed Stainless (and others) you hit the nail on the head! When cold forming the wire we use a hydraulic oil for lubrication. This was not properly cleaned before the annealing and this caused some sort of reaction between the stainless steel and the oil. I've annealed a clean batch and no...

After annealing we then profile the wire in 3 more steps using profiling wheels. After that the wire is wrapped and resistance welded into a screen. The resistance welding has a fairly high temperature which causes some discoloration, scaling. This is why I need to pickle as well as to get...

Thanks Mcguire, BUT, I can't get rid of the annealing step. Without it my ferrite readings go to 10%++. When the inspectors visit the factory they'll make a big pile of scrap, and I mean a really big pile. I need to anneal and pickle. Is there some way I can get rid of the oxidation before...

Good to hear from you EdStainless, and you also Chembros. The SS304L is required by the specs of the tender, it's not feasible to go higher nickel. No one would purchase from me. Allowable ferrite reading (using a Ferritescope) is 5% on the wire surface. I can't get this low a reading unless I...

Hi All It's maybe a little off the theme of this thread but here goes. I'm having a problem with grey discoloration on my stainless steel screens after pickling. I have never experienced this problem before but now there are a couple variables. Previously we have made our wedgewire screens...

Hi again Desertfox I quoted this job "as per API" which means that my threads have to comply with the standard for depth, pitch, taper etc. Normally I don't thread onto casings, I roll and weld my own blanks and then thread these. No problem with the fading threads as I control the OD. These...

Hi Desertfox Appreciate the prompt response. No, we can't skim them any more, not enough OD. I'm not sure if we've enough thread length to do the job, if you ask the boys in the factory the answer is "YES!" I'm more concerned about what API 5B or 5CT has to say about this.

I am threading buttress on 7" seamless SS304 casings. As I get to the end of the thread there are areas where the cutting tool doesn't come into contact with the casing (due to tolerance in straightness / roundness) What does API 5B allow? I"ve got the specs but I haven't been able to find...

Dear All I have files on a disc which are .exp extension. I am using Catia V5r16. How can I open the files with the exp extension?