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  • Users: smurali1
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  1. smurali1

    Corrosion protection for sea freight

    I am interested to know safe (for rust) way of transporting gear box from Europe to India. During testing of the GB the oil splashes all over the interiors of GB and lubrication happens. The oil is drained after testing and only a film of oil remains on the internal parts. Can this film...
  2. smurali1

    Effect of graphite particles

    Hello, What is the effect of graphite particles (coming out of machined cast iron) on the gear box life. Please note that we do hot alkali wash the cast iron part before assembly. However, the black color is still seen on some places on the surface. We need to use tissue paper and manually...
  3. smurali1

    Graphite erosion from cast iron

    Hello all, We are using a Cast Iron housing which has a machined hole. We pump lubrication oil through this hole. Will there be any erosion of graphite from the cast iron and will it get mixed with lubricating oil. I have this doubt because, if we rub our finger over machined surface, the...
  4. smurali1

    Manganese Phosphate coating presence

    Hello all, I am looking for a chemical test which will help me to detect the presence or absence of Manganese phosphate coating on steel part. Your feedback please. Thanks smurali1
  5. smurali1

    Exploded graphite in SG Iron casting

    We have some SG Iron castings. We found exploded graphite formation in some of the castings after machining. (The confirmation was done by destructive study of one casting) Are there any NDT method to find out how much depth is exploded graphite? Thanks SPM
  6. smurali1

    Taking reference

    While taking datum for finding position, Is it right to do the following in a CMM: 1. Probe three points to form a plane. 2. Probe two circles and join their centres to form a line. 3. Use one of the above same centre as a point to completey fix datum system. (3-2-1 principle). I think the...
  7. smurali1

    Partial nitiriding in part (within part variation)

    Hello, We are doing nitriding of large internal gear (appx. 1.5m in dia) We are finding that some areas are as bright as original steel material before nitriding. There is high level of variation within a part. We tried 5% copper sulphate solution to check the effectiveness of nitriding...
  8. smurali1

    Casting hardness

    Hello, We are procuring Grey cast Iron casting (GG25) from one of the supplier. Supplier has checked in 10 spots and certified the casting to 185-200BHN using Poldi hammer. He also has certified UTS value as 305MPa. Supplier then shipped the casting to Europe. When European plant checked...
  9. smurali1

    Soot

    Hello, We are doing carburising hardening some gear parts. After tempering we do shotblasing of the parts. Now, customer is insisting on 100% removal of soot from the parts. He also wants the part to look like steel grey and not blackish. The evaluation method is rubbing a tissue paper on the...
  10. smurali1

    Decarb

    We are doing carburising (long cycle - case depth of appx. 3mm) in pit type gas carburising furnace (endo gas). The part is taken out and quenched in seperate quenching tank which is appx. 50 mts away. 1. What should be done to control decarb on the surface? We also apply anticarb paste in...
  11. smurali1

    IGO

    Is there a standard which describes how Intergranula Oxidation has to be measured, how the sample has to be prepared, how the reporting (max. or average of x readings etc.,) has to be done.
  12. smurali1

    Magnetic Particle Inspection

    We do a MPI with kerosene based carrier. We want to switch over to a non-inflammable carrier for eg. water. Do any body guide on this?
  13. smurali1

    RUST PREVENTION

    We are looking to ship some machined soft steel parts and machined cast iror and ductile iron parts from Europe to India. Can any one recommend a suitable rust preventive method (type of RPO, RPO application method, VCI or non VCI etc.,) We had tried few methods which we used for shipping...
  14. smurali1

    Capability for low sample sizes

    Are there any correction factor for calculating capability when samples sizes are low? Here I am talking about 10~12 samples. The industry I am operating produces parts at a rate of 10~12 per month. So, waiting for 30 parts is taking too long a time to assess capability. Thanks SPM
  15. smurali1

    Reverse load on gear box

    Hello, What happens if gear box is loaded in reverse direction continuously? Are there any restrictions on load (% of rated load), time (max. time allowed) for reverse loading of the gears? The GB in question has helical gears and is planetary type gear reduction. Thanks SPM
  16. smurali1

    Is given value, a part of distribution

    Hello, I have appx. 50 data points which were vibration measurements taken a month back. Now I have two data points measured recently. How do I statistically prove if the 2 recent values are also part of original distribution? Thanks SPM Note: Being vibration measurement, the spec. is...
  17. smurali1

    Effect of grain flow in Copper strip's flexural strength

    Hello, Can any one guide me about effect of grain direction (after rolling)on the flexural strength of copper strip. If any literature on this subject is referred, it will be great too.. Thanks SPM
  18. smurali1

    Effect of polishing on micro vickers hardness

    Hello, I have a colleague who claims that the micro vickers hardness will be highly influenced by extent of polishing done (rough polishing vs. very fine polishing/mirror polishing). He claims the effect is as high as 30HV1 between "semi-polished" and "fully polished" in the same part and same...
  19. smurali1

    Case hardness variation

    We are doing carbursing case hardening on a SAE 8620 material in an Integral/Sealed Quench Furnace using LPG+N2+Methanol atmosphere. The case depth : 1.5-2.4mm, Surface hardness: 58-62HRc. We are currently facing a problem: 1. Case depth below specs but surface hardness OK 2. Surface hardness...
  20. smurali1

    Effect of furnace atmospheres in carburising

    Dear all, I am interested in knowing effects of furnace atmosphere in carburising heat treatment. The material in question is 8615H (with C=0.1-0.14 and B=10-30ppm) Effective case depth required: 0.45-0.78mm. Case hardness: 79-82HRA Core hardness=32-44HRC The atmospheres being considered are...

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