Specifications for Round Bar

Anyway, I need to get round bar material that can be worked with ... drilled (threaded maybe) and welded ... but will still provide durabillity as a shaft. I seem to remember material that was "sps" ... but not absolutely sure and that term/spec seems to be no longer applicable. I don't think O1 (oil hardened) is the correct designation either. Anyone out there have as long a memory? The shaft (1 1/2 - 2 1/2 dia) is in a very very low turning application ...

What is the size? 1 1/2 - 21/2 tapered, stepped? Do you have different size?

"some round bar" doesn't give much to go on. How long are they/it.

Maybe go here:Search GlobalSpec Type in "steel rod stock" Or round, maybe.

Hi Milo

Thanx for the info ... very helpful. As for the application ... I'm designing a rolloff hoist. On the outside are sets of rollers that the rails of the can ride on ... it's mostly done in the US. We Canadians just like to drag the can up sans rollers ... metal on metal seperated by grease ... assuming the driver performs proper maintenance.

Anyway, the rollers are something as simple of 4" round with a bronze bushing insert. These rollers run on an 1 1/2 - 2 1/2 " axle. The axle has a grease fitting for maintenance. Both the axle and the roller primarily provide support for the can. They need to be tough but material also need to be "workable. No need to be hardened. What would be your choice of material. As I said b4, I remember the designation of sps fitting these kinds of applications. That was a long time ago ... in another lifetime.

Dave

I don't know what sps means. sorry.

I'm thinking weight? 4" is weight. Why not tubing?

1018 for rollers will be available by the slice in 4" from service centers. 1045 for axle.

As long as sulfur is 0.020 wt % minimum it will drill fine.

milo

Then why do you need the weldability?

Any of the tough materials in Hardened and tempered condition would have done.

I would have loved something like AISI4340 in HT condition alternately 4130 (weldability OK) and 4140 could do.

That is provided you do not want to surface harden the rollers.

Just to help your thinking along, the weight for 1-1/2" steel round bar is 6.01 pounds per foot.

2-1/2" round is 16.7 pounds per foot. How many feet of these axles were you going to have?

4" round is 42.7 pounds per foot... How many feet of rollers?

10- 2 foot rollers on axles (five per side of truck) would be 120pounds of 1-1/2 axles plus 854 pounds of 4" rollers plus bushings plus pillow blocks to hold the axles- about 1000pounds ...

ASTM A 513 mecanical tubing 4" 1/4 wall is 10.01 pounds per foot, add a 4" diameter slice on the ends to ake it a 'roller' (4" steel round for that slice is 3.56 pounds per inch you'll probably weld 3/8 or 1/2" ends...) THis achives about a 70-75% weight reduction...

milo

Hey Milo

I've decided to use 4" dia (4140) for the roller with a bronze bushing insert (w/oil groove). 2" dia ground shafting ... drilled for a grease fitting (and cross drilled) with a slot gound in one end for a locking plate. No welding needed .. ... removable for any repair. Not an option in the industry btw.

Thanx to all for the info and input.

Dave

Are you heat treating the 4140? If not, why pay for the alloy content? as annealled cold drawn without HT it will be same properties as 1045. WHy pay more?

Good luck withyour project.

Milo

GA Milo. I'll bet you could write a pretty decent essay or article on the subject of steel selection for mechanical designers. (and mechanical engineers , too). We generally don't have the legacy of codes and best practices that the other engineering disciplines like civil and chemical have.

Most of us ME's have taken a metallurgy or materials course which helps us understand the science at a somewhat superficial level; but don't give us a clue about which steels to use for what application. What you can actually buy when you need less than a mill run, whether and how to spec a heat treat and some of the other issues you hinted at are great mysteries.

Ed Weldon

GA