Thank you for the valuable comments from you all.
To Ironic Metallurgist,the specified carbon content is 0.48%max and the chemical analysis result shows that it is within the specification.
Hi,
The range of chemical composition of steel or an alloy has always been stipulated. But, on what basis the RANGE of chemical composition was defined?
I have a Cr-Mn Forged Steel Shaft, where its Chromium (0.9 to 1.5wt%) and Molybdenum (0.15 to 0.3wt%) contents are marginally higher than...
Dear All
Thank you for the comments. I have done a metallographic examination of the cross section and no plating or coating is revealed from the microstructure. This would indicate that the XRF result is accurate.
Metengr.
Thank you for your information. I have now went further by cutting a cross section of it and tested it with a XRF analyser. The test result still show the same with 99.7 % of zinc with traces amount of Cu.
Is it possible that the fabricator was trying to save cost and cast the...
Dear Gandhi
I am not going to cast the part. I have this new set of air connector and chemical analysis revealed that it contains 99.7% zinc. I just wonder why would someone cast this part with pure zinc and not the typical zinc alloy.
Can anyone please advise whether an automotive part can be casted with PURE zinc (~99.3%)?
From what I know, the typical zinc alloy for casting is ZA alloys and ZAMAK alloys, which contain appreciable amount of aluminium.
Thanks.
Metengr: I did repolish at 6 micron and the dark particles appeared to be pits.
Maui: Thank you for the comment. The time elapsed was about 1 minute.
EdStainless: Below is the unetched microstructure at 100X (taken before etching with Kalling's 2). The dark spots observed are...
metengr and EdStainless
Thank you for the comments.
The etchant used was Kalling's No 2. Hardness is yet to be checked. It contains about 15 % Cr, 0.75% Ni and 0.95% Mo. I do not know the actual C level. I think it is an annealed form. What I am puzzled is the cluster of the "dark"...
Hi all,
I have prepared an etched martensitic stainless steel and it appears differently from what is expected. This stainless steel was not used in high temperature application.
I have done some research and the microstructure observed could be a highly tempered martensite or annealed...
Dear all
I am taking part in maintenance of a bucket elevator (vertical)in a cement mill. The conveyor consisted of a thick rubber with steel cords/wires encapsulated within. The strength of the belt largely derive from the steel cords/wires. I have been told by the supplier that we have to...
I had drilled a bolt hole of 8mm diameter into a solid steel that was so close to the edge (around 2mm to the edge) of the steel. After sometime, the steel had fractured across the bolt hole. Does anyone know a rule of thumb of placing a center of a bolt hole from the edge of steel? Is there...
