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swearingen, et al, I do not see -(5X5) as the same mathmatical expression as -5^2. -(5x5) means that you are simply turning a positive product into a negative value. Mathematically it could also be written as (-1)X(5X5). Mulitplying the -1 through the equation would result in (-5X-5), which...

-5^2 is equal to 25! -5^2 = -5 X -5 = 25! When two negative numbers are added together they equal a negative, but when they are multiplied they equal a positive. If you multiply -5 X 5 you get -25. RLJ s-)

A sincere 'Thank you' to all that replied to this string. Your comments and direction have been a great help. We now have a company representative in China and I look forward to getting more information on this subject. Until then, thanks again. RLJ s-)

Thanks for the helpful replies. Does anyone here have similar information about steel sizes that are available in China? I am looking for typical beam, channel and angle sizes available and engineering data, using the beam sizes in the original post as a starting point. RLJ s-)

tlf, I have heard my whole life that a person will never get rich working for someone else. Review your personal reasons for wanting to be partner: cash, prestige, power? There is nothing keeping you from striking out on your own. Discuss it with some of those customer contacts you have...

I am currently working a project that requires the use of metric sized beams. Parker Steel International provided data for general sizing and drafting. What I need now is firm engineering data; section modulus, moments of inertia, etcetera. The particular beams that I am currently interseted...

Calculating screw conveyor flow is not extremely difficult, but it does take some figuring. The following works for solid materials. Liquids or sludges are another story all together. First, determine your materials density Kg/Cu-M or Lbs/Cu-Ft. You want this to be consistent if possible...

I am looking for a material coating which can be applied to cast iron that will protect the cast iron when submerged into a molten aluminum bath. The coating would have to withstand 1400F temperatures, moderate abrasion, and expand similar to the cast iron. I would prefer to keep the coating...

arunmrao, We currently case harden the 8620 to a depth of 0.120" with a total material thickness of 0.500". If the manufacturing benefits favor the 8620 we could always increase the depth of case hardening. Which material is easier to cold work? RLJ s-)

mcquire, Thanks for the response. Do you know of a good web source for chemical composition and performance data on these two materials? RLJ s-)

I am reviewing the manufacturing process of a cone shaped piece currently made of 8620 material. The material is cut flat and rolled into the cone shape, cold working the 8620. @28" large diameter, 16" small diameter. Then a mild steel mounting ring and base are welded to it. The...

Mudfarmer, Try Whiting at www.whitingcorp.com. They have produced a very detailed book on crane manufacturing. However the last time I checked their website the book was unavailable as it is in update for a future release. The last I knew it was free for the asking. Also try the Crane...

phoward, Excellent batch of information. Additional information: The Boiling point is 350F to 415F; the falsh point is 145F; and the vapor density is 5.3 (air = 1.0). This, combined with your information, tells me that we should have a very slow evaporating product that will drop and fill low...

I am reviewing a MSDS of a product that shows the evaporation rate as: {Evaporation rate (BU-AC=1) = 0.03} This is similar to vapor density using air as 1. However, I do not know what BU-AC is or its evaporation rate. Can anyone explain this? Thanks in advance, RLJ s-)

Are there any good down loadable spread sheets for determining proper OD expansion of a round steel tube when heated to several hundred degrees F. Thanks RLJ s-)

MathMan, Try NIOSH at www.cdc.gov/niosh/ RLJ s-)

Wouldn't having a positive camber (upward arch) also allow for a positive/compressive stress loading of the upper girder plate and negative/tensional loading in the bottom girder plate? Both upper and lower plates would be in tension if the arch were flat to negative. In addition, Hagan, yes...

lly, Some additional ASTM info. A35 is part of a specification for Practice for Procurement, Testing and Sampling of MAgnetic Materials. The reference I have shows the particular section A53 being discontinued, you should check a more recent ASTM source. In addition the A53 Type F spec shows...

lly, The ASTM A53 is a class of pipe. This covers black, hot-dipped galvanized welded and seamless pipe, ANSI schedules 10 through 160. I do not have anything on the ASTM A35! RLJ s-)

flangetrade, See ANSI B16.1-1975 for Cast Iron flanges and ANSIB16.5-1981 for Steel Flanges. Both of these style flanges are round. Could you carify your questions about the squareness. RLJ s-)