Developing a small zinc casting using Zamak5, its not a precision or a thin walled casting, however extreme voids and porosity can result in a structural failure (yielding of the part).
What would be a good visual inspection method and standard to use? Of couse we have recommendations from...
Dear eng-tips crew, need your help figuring out requirements for fatigue on this stabilizer bar.
Life 100,000 - i get that.
Random sample, min six parts - OK got that.
Here's where i get lost
"The test requirement is for Pu = 50% (actually P sub u double dot), and permissible standard...
Hi everyone, i'm trying to find an equivalent to 55SiCrA steel. I dont know much about it, i belive its made in Beijing by Baosteel.
Is this ultra high end like micro alloy SRS60? or is it normal like 9259? hmm...
Any help appreciated..
Hi everyone, being a coil spring engineer i'm trying to broaden my horizons by looking at other industries, in this case automotive coil springs.
I've got some friends who drag race and they go through springs a couple times per season due to huge valve lift, high rpm, large heavy valves, etc...
Two pronged question about the hex end of a torsion spring.
I understand what a profile tolerance is, normally w/o the phantom lines it implies equal bi-lateral profile.
However, what if the profile points to a surface that is also a datum? (i.e. A datum of a torsion spring is the hex flat)...
Spring folks, I'm looking at hot formed quenched and tempered sprigns for the automotive industry.
I know the chemical compositions of each.. but i don't know the engineer's characterization of 9254, 9259, 9260, or SRS60.
Have you guys worked with these steels? What is the good / bad / ugly...
Trying to understand comments on this board - What is an ionic bonded coating? Does it have potential to improve salt spray and cyclic corrosion properties?
I realize this may be a future technology and could be 'secret' but if there is anything non secret i'd like to try this.
Thanks,
TN
I found that 750F is not a great enough temperature to relieve all the residual stresses in 4130 steel sheet. I'd like to go up in temperatiure to 1200F (that is what ASME recommends).. but 1200F is so hot I'm worried about decarburization, oxide scales (hematite, etc.).
What is the highest...
I have a sample bag of PPG CHEMFOS 2008. It doesn't say a thing about how much water to add, concentration, etc.
The application guide states it should be daubed on a room temp.
In addition, it states to rinse off with CF 2008DEE and let sit for 20 seconds followed by a final rinse / dry...
Tonight i had a big boil over in my salt pot. I think it soaked up the dampness over the summer in my basement - i left the cap off for at least two months. dumb i know.
Can i boil the water off by holding at the boiling temp for a while? heck, it started boiling at only 550F!! It was like a...
I have done a lot of forming on a sheet metal part, and its ready for heat treat. I need to minimize warping during the quench and temper.
To discover and fix potential warping, ideally I'd normalize and straighten the warm part several times before final hardening heat treat. Well, you...
Help needed, one of our main steel suppliers for raw bar (rods) wants to change from Centerless ground surface to turn and polish surface.
We are worried about fatigue issues. Potential sub surface voids and lapping caused during the turn and polish process, and any other pitfalls of Turn vs...
Need help with lessons learned and potential gotcha's with in plant weld repair methods. Point is to repair and ship as good parts with proper repairs.
Is there a repair standard out there?
1. MIG process
2. 1010 steel
3. 2.5" sheet steel, fillet welded.
In addition, what is key to...
Seems my glorious salt pot that was supposed to be scale free is the opposite.
Is it possible that steel samples heated to 1600F in an argon atmosphere kiln, subsequently quenched into the salt pot, is being oxidized by the molten Nitrate / Nitrite mixture?
Quenching 4130 from 1600F into salt...
Seeking high ductility, fatigue and hardness in a spring element. Air quenching is obviously the most efficient and least expensive method.
I'm looking for fine pearlite (ferrite+cementite).
Wondering what size 'fine' really is. i've seen 3microns called fine, 50 microns called 'impossibly...
Hi this is my first post here!
I'm planning to Austemper a rectangular structure of 4130 sheet steel, 1mm thick, appox 10" long, 1.5" box. I'm creating some small stampings and dimples on this structure as well, so there will be a lot of stresses built up.
Goals are to obtain toughness...
