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  • Users: arunmrao
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  1. arunmrao

    Concrete sinker block .

    This is my first posting in this forum . I am a Metallurgist and I have a RFQ for a concrete sinker block with bellmouth and lifting attachments. A concrete block is to be cast with weight measuring upto 20700kgs ( pl see a image of the arrangement). My concern is about the concrete density...
  2. arunmrao

    Flame hardening burners needed

    I have a part that needs flame hardening. It is a wheel (700m dia) and weighs about 300 kilos. Alloy is cast equivalent of 4340. I propose to flame harden in-house and I have been searching for 2-3 sets of burners that can also spray water for quenching. Please see a representative picture from...
  3. arunmrao

    A question related to Clump or gravity weight castings.

    My first post in this forum seeking some help. I am a casting manufacturer and I have a request for Clump castings weighing from 3 tons to 10 tons per piece. I have in the past made ballast weights for fpso systems and a for cranes. I shall be obliged if someone could direct me to DNV or BV...
  4. arunmrao

    Crane Test weight- 240 tons

    I have a RFQ from a power station for Crane Test Weight 240-260 tons . This weight will be used to calibrate the lifting capacity of new crane purchased from China. The power station does not want to risk lifting the generator before having it calibrated. As it is one time use they want to keep...
  5. arunmrao

    Additive Manufacturing for Metalcasting Conference

    American Foundry Society is organising a Additive Manufacturing Conference , with focus on metal casting industry. Any members interested in attending might visit the AFS website www.afsinc.org. https://www.afsinc.org/conferences/2018-additive-manufacturing-metalcasting-conference "Even,if...
  6. arunmrao

    Seek advice on Ni Resist casting

    I am planning to cast a ASTM A436 Type 2 ( 20% Ni, flake graphite type), Ni resist casting. This is an impeller bowl casting for a single stage vertical lift pump in sea water. The lifting pump is used as circulating water pump in Thermal power station. The approximate weight of this casting...
  7. arunmrao

    A new 3D sand printer

    I have seen the big and established ones for 3D sand printing to make moulds and cores, without the need for making patterns or core boxes. But they are super expensive. Now, there is this new machine from (https://envisiontec.com) claiming to be 1/3 cost of the competition. They use a robotic...
  8. arunmrao

    Slurry pump impeller casting

    This question is about manufacture of high chrome dredger pump impeller casting. I have received a customer's casting with no drawing for reengineering. The casing is a simple job, but with the impeller I have a challenge. Normally, the internal threads for engaging the shaft, is machined...
  9. arunmrao

    Pellet extruder system

    I am looking at introducing pellet extruder system to the existing 3D printer. I believe, this increases speed of printing ( about 60-70 times faster!), very economical, with a downside of poor finish and less accurate compared to PLA filaments. Please share your experience. "Even,if you are a...
  10. arunmrao

    A newbie to Additive Manufacturing

    I am old school boy, spent all my time with furnaces and sand moulds. Now, metal casting industry too has been taking advantages of this new technology. I recently attended first Additive Manufacturing Technology for Metal Casting by American Foundry Industry. I was overwhelmed seeing the...
  11. arunmrao

    How to calculate Working Load Limit (WLL)

    I am planning to cast a 10 ton test weight ( 3000mmlong x 1160mm wide x 418mm high). There are 2 lifting points with 45mm dia 600mm long 304 grade S.S rod. The exposed length of rod is 200 mm, under which a 6ton belt can pass. I have been asked to indicate WLL at each of the lifting point...
  12. arunmrao

    The Alloys of Brew

    Occasionally, I come across some interesting articles on LinkedIn. Here below please find a link to one such article. It is regarding selection of metals for brewing beer ( craft beer) . While you read, I raise a toast Cheers! http://www.reliance-foundry.com/blog/brewing-metallurgy ( ps, if...
  13. arunmrao

    Special bolt requirement.

    I have a request from a customer to use an off set head M16x60 mm stainless steel bolt. I have provided a sketch of the same. What are such bolts called and are they available off the shelf. Thanks in anticipation. "Even,if you are a minority of one, truth is the truth." Mahatma...
  14. arunmrao

    Slow down in China steel shops

    Sorry, this is not a technical topic, but I am sure it holds interest to most of us. The yuan devaluation by 3.5% has shaken the world markets. But, more is happening in those large mills and foundries, which are affected. I read on the net, that the local government is artificially supporting...
  15. arunmrao

    XRF Detectors for light alloys- limit of detection

    A new XRF from Niton is being proposed for a group company, manufacturing sacrificial anodes Al-In alloy.I have limited experience and knowledge about the accuracy and reliability of this instrument. Presently ,OES is being used by the foundry.I would like to know: a) If such an instrument is...
  16. arunmrao

    Metallurgy education in 2020 any thoughts

    An academic one, but I was wondering the direction Metallurgical education would take in universities in 2020. Any wish list or comments from the influencers here. My wish list would be to get the basics right and lean towards experimental metallurgy ( I am biased perhaps). I'm just one step...
  17. arunmrao

    Suggestion for sourcing pure tungsten metal scrap or tungsten carbide

    I have a need for about 1000 kilos of solid tungsten metal scrap or tungsten carbide scrap . Scrap is preferred because of cost . Tungsten metal is being used for weight calibration of a large calibrated Test weight casting (10 tons each) . Lead is not an option. I need tungsten that shall...
  18. arunmrao

    Calibrated heavy cast iron test weight

    I am looking for tolerance values on a 10 Ton , cast iron test weight. I understand it is 0.3% according to NIST standards. Can any one having experience calibrating such large weights share their experience. Thanks in anticipation. I'm just one step away from being rich, all I need now is...
  19. arunmrao

    Spring steels

    I am looking for books or technical references: "Effect of Silicon on Bauschinger effect in spring steels". Thanks in anticipation. I'm just one step away from being rich, all I need now is money. ( read somewhere on the internet)
  20. arunmrao

    Newbie question on controlling thickness of galvanized coating

    This is my first post here . I attempted to hot dip galvanize a small steel strip ( 150mm x 50mm x6mm thick) to achieve a coating thickness of 50 microns max. I ended up getting a real thick coat. This galvanized steel strip is to be placed in zinc anode casting , which the foundry produces...

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