Search results for query: *

Hello ! Could anybody explain : Why ASTM A837 (Standard Specification for Steel Forgings, Alloy, for Carburizing Applications) quantifies BHN 229 as the maximum hardness for forgings to be carburized (see section 7.1.1)? I believe it`s because such a hardness level provides better toughness...

Hello : Does anybody know the effect of high temperature application (80-90 C)OF BRONZE ALLOY C93800 used as bushing material ? Note ; A synthetic lubricant will be used to keep the temperature range under control.

Dear All ; I need to prove to my customer that : (Tempering temperature - 20 C) , is an acceptable temperature to be used on stress relieving cycles for weld repairs in castings. Would you please reference a literature for that , so I can substantiate my statement ...

Hello All ; Have you ever seen a 4 - leg - yoke being used on magnetic particle test ? If "yes" , is it acceptable and / or recognized by any Standard or Code ? To my knowledge , the magnectic field created by a 4-leg - yoke is neither longitudinal , nor circular , and US does not make use of...

Hello : Is there any equation which could be used to evaluate tensile strength of bronze castings (alloys: C93700 & C93800) through its correlation to the hardness value like in steel ?

Hello : ASTM A 291 establishes either a diameter or thickness range for the mechanical properties on table 3 for the different classes of steel. However , ASTM A 290 doesn`t. Question : For what thickness and/or diameter range can I use the mechanical properties of ASTM A290 - table 3 ...

Does anybody know the definition of "COMMERCIAL GRADE CASTINGS" ? Are there different grades of "Commercial Grade" castings ? If "YES" , would you please give me a brief explanation on that ? Thank you.

Dear All : Material - Aluminum - grade 6061 - T6. Oprating temperature - 60 / 70 C. Environment : vapors of sulfuric acid ; phosphoric acid and ammonia. Application : N , P , K fertilizer dryer. The surface texture presents a blue coloration on the bushing. Questions: 1. Could the blue...

Hello Everybody ! We have a large component (fabricated via S.A.W in ASTM A 36) which needs some large welding to be developed at the port site due to transportation reasons. The weldment will be connecting two cilindrical bodies (like two "cans")which are 7.3 meters in diameter and 17 meters...

HELLOW ! Is there a portable instrument that allows me to measure retained austenite "in-situ", or the only possible way is via the traditional lab sources such as : X-ray , .... and others ? Thank you.

How far apart are they on the Galvanic chart ? Would Galvanic corrosion be a potential risk between them ? Thank you.

Dear Fellows: We are manufacturing a 316 SS slurry tank which will be working at ambient temperature (78 F ). The amount of chloride in the water process is ~ 2000 ppm . It is not a pressure vessel, and there will be constant exposure to the atmosphere. The water will be constantly agitated...

Hello ! Current Material - A 36 or A 515. Environment - chlorides (~1.5%); SO2 ( ~ 0.13%) and coal (~ 1% S). Mechanism : The gas entering the system will be around 1100 C, and will be quenched by fresh air down to about 350 C. Most of the chlorides and alkalis should condense on the dust. The...

Can you give guidance on aluminum corrosion in pebble lime plants? The literature suggests good performance of aluminum in the presence of lime but we are experiencing corrosion in this environment. The aluminum is outdoors and will be covered with CaCO3 and CaO (which will turn to Ca(OH)2...

Hello: Could anybody help me out by advising whether there is a correlation (or a rule of thumb) between cutting tool HB vs. parent metal HB or not ? We are currently buying a gear in China and the vendor reported that the Hobbing cutting tool is wearing - out prematurely. We then asked for...

Does anyone have data on the effects of calcium additions on gear pitting resistance ? Thanks.

Hello All ! Is it acceptable as per ANSI/ASNT Standards to use a 4 - prong - yoke to develop magnectic particle test on castings ? If "yes" or "no" , could you explain why ? We saw that for the first time in China , and confess that I had a hard time to follow the magnectic field created by the...

HELLO ! "DROSS" (Magnesium oxides and sulfides)is an undesirable inclusion in ductile iron castings. However, some foundries claim that it is not detrimental to the mechanical properties (which I DO NOT agree though). My questions are: 1. Does "dross" act as a crack - like indication on a...

Hello: I would appreciate if somebody could send me some info on mechanical properties of that alloy. I also know that Lomalloy L-9 is a brand name and would like to know if there is an equivalent intl. standard to compare against. Thank you.

Hello: According to ASTM A 609, reference blocks shall be made from cast steels that give an acoustic response similar to the castings being examined. I have a supplier (overseas)that cannot pour heavy test-blocks for a 40"- facewidth gear; however, it has a forged bar which can easily fulfill...