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Hi All, We are looking into using digital radiography to check wall thickness on lagged steam pipes at a power station. There is lots of literature and advertising out there but we would be interested to know what people think of the technology. What methods did you use and did you get good...

Hi All, I'm hoping that someone might be able to point me to some information about pad welding re-heater tubes. The standard route is to Argon flush the tubes for pad welding, but we are trying to explore the possibility of doing the pad welding without argon, as long as there is no burn...

Hi All, Despite reading many references on the net and in these forums I'm still confused about what maximum Ferrite Number I should specify for welds between 316L or 304L. This is for structural welding which will be in service at the coast. The electrodes being used are as pre-qualified (by...

Hi All, Is it normal practise to back gouge after only one run in a single vee butt weld and then finish the other runs on the first side? This is for a 316L, 8 mm butt weld. Usually I see procedures where the backgouging and run on the other side done last, so I'm not sure if this is a...

Can anyone tell me what is meant by a furnace weld? It isn't a term that we come across very often in Australia. I'm asking in regards to welded steel boiler tubes, but I'd be interested to know what is involved in the process and common applications. Thanks All!

Hi All, We are trying to source Nimonic 80A bolts for a steam feed pump, to replace some that are approaching their end of life. One supplier is proposing to machine the threads after heat treatment, as per the material spec sheet, but the other supplier is insisting that 80A bolt threads are...

Hi All, I need to get NSS (Neutral Salt Spray) testing done on an assembled pulley, with the disc being made from a speroidal graphite cast iron and the shaft being a 431 SS. The real aim is to test for water ingress past the seals and into the bearing, but we would also like to see if we get...

Can anyone tell me what times and/or temperatures would be required to grow approximately 50 microns of magnetite on a 12%Cr, martensitic stainless steel? I have a failed turbine blade has seen 65,000 hours service at less than 100 degC (steam) and I have found magnetite on the fracture surface...

Hi All, I've heard anecdotal evidence that 4140 steel suffers from Stress Corrosion Cracking in coal conveyor applications. Can anyone provide any information about this? I assume that 4140T would be worse than 4140R, but does R suffer from severe SCC?

Hi All, I'm looking into options for arc spray coating materials on a grey cast iron component. Currently a Ni-5Al coating layer is applied, followed by a high chromium alloy coating. The component is exposed to dry coal and possibly some direct metal to metal contact. I'm wondering if a...

Hi All, I'm trying to find the appropriate ASTM standard for a weld hardness traverse (destructive, on the cross-section), preferably Vickers testing. It is to replace a reference in a spec I'm writing to the Australian standard AS 2205.6.1. Can anyone point me in the right direction? Does...

Hi All, I need to use AWS D1.6 and only have the 1999 version. Is anyone able to tell me if the 2007 version has many fundamental differences or if it is mostly the same? Does the 2007 'work' in the same way as the 1999 release? Thanks, Gem1

Hi All, I'm trying to pin down a cause for an OD thermal fatigue cracking problem in boiler waterwall tubes. The cracks are slow growing and have the characteristic vee shape and S spine associated with thermal fatigue, but there is minimal thermal degradation of the tube. There is a very...

Hi All, I'm wondering if anyone has any helpful information about pre-treated cupro-nickel condenser tubes. That is, tubes that have been given a ferrous sulphate treatment prior to installation in an older condenser, to build up a bore scale and prevent pitting. I'm having trouble finding...

I'm looking for information about the affects of molybdenum content on low alloy Cr-Mo steels, in relation to temper embrittlement. I've been trying to determine at what Mo content you could say that the likelihood of temper embrittlement was relatively low. Some digging suggests that 0.5% might...

I am having a reasonably severe pitting problem with high carbon(0.9%)low alloy steel. The steel is well coated in grease, but the water content of the roller grease is way above spec. I'm thinking that the water is a big part of the problem but am having trouble finding information about the...