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Dear Friend, For cast iron beds used for precision machinery like jig borers etc., it has been the practice to get the beds rough machined and leave it in the open atmosphere for 3-4 years for 'natural ageing' to take place. Such beds have been found to retain its accuracy and free of...

Priyasachin Friend, In addition to these benefits explained above, the thread rolling being a cold working operation, causes the flow lines original material flow to the profile of thread. In a cut thread the flow lines are disturbed and stripping of the thread on overload is possible. The...

Priyasachin Dear Friend, While there are many suggestions, I have one too. I have seen such failure on turbo shaft of diesel locomotive. One possibility is that this type of failure could be controlled by using hollow shaft rather than solid shaft. The failure is due to tortiona;l vibration...

PRIYASACHIN DEAR FRIEND, A 516 steels are for pressure vessels. depending upon thickness and the facilities available, the shells may be cold formed or hot rolled. The hot rolling would alter the properties. When it is known that hot rolling would be necessary, we specify to the manufacturer...

Priyasachin Dear friend, Use very low sulpher bearing steel. Such steels are produced for serving in ' Sour Service'. The specified sulphur content is in the order of 0.003% max. Such steels are very resistant to H2S blistering and HIC too. MRCN

Priyasachin Dear friend, If the original material is in normalised condition the stress relievig at 650 may not change much. Also annealing at 950 will change it a little. But if the material is in 'control rolled condition' or what is popularly known as 'TMCP'steel, any of these treatments...

Dear Friend, Somuch on the benefits of forging over casting. One point to note is the aspect of anisotrophy, the differences in the properties in the direction of forming and across. In perticular, the ductility properties viz. reduction in area, which is affected significantly. Whereas the...

Dear friend, There are two aspects involved in this. Firstly, thickness. The very fact that we have gone in for thicker material is expected to see higher pressure. Since the size of the impact specimen and its location in the section is same, only aspect that varies is the centre-line of the...

dear friend, welding clad material is a standard practice now. you can weld from any side. if it is a single side weld welding first the CLADSIDE IS INEVITABLE. When so is the case seal the gap with TIG with the clad quality weld metal build it up by this or any other method till the 3mm layer...

Priyasachin. Dear friend, In a pressurevessel, the carbon backing material is to withstand the pressure, and the overlay material to counter the corrosive environment or to maintain meaterial purity etc., In either case the tests need to be conducted while qualifying is the chemical...

Priyasachin, Dear friend, Normally a 216 castings are for high temperature service and castings to A 352 for low temperature service. Since the castings to A352 needs care of manufacturing to have inherant fine grain to get the necessary Charpy impact properties, the material is costly than...

priyasachin, dear friend, the composition is similar to high manganese steel also known as hadfield steel. It has a good wear resistance, owning its property for the work hardening tendency it has in abundance. but this material is virtually unmachineable, because as the tool digs in the...

Priyasachin, dear friend, it does make sense. in high carbon steels with or without alloying elements like chromium, the quenching for hardening leaves some residual auatenite in the structure. in hss tool-steel hardening and tempering it is common practice to deep freeze, a treatment similar...

Priyasachin, dear friend, one more reason of DWTT is: whereas the standard V notch impact test is conducted on fully machined bar of 10x10mm or smaller, it is certain that the surface condition of the mother plate or product does not get reflected in the test. in DWTT the sample is much wider...

Friend, API X42 is the line pipe spec. This is basically plain carbon steel. The bar equivalent to this is AISI 1020 or 1025. 8620 is low alloy steel and NOT equivalent to this. Regards, PRIYASACHIN