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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Angle iron
I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I
bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC |
#2
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Angle iron
wrote in message ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC I think your 'extruded' angle is hot-rolled steel, the 'formed' angle is cold-rolled. Is it smooth and zinc-plated? Typically cold-rolled has a higher yield point since it has already been deformed and moved up the stress-strain curve by the rolling process, while hot rolled steel is in the softer annealed condition. If that's unclear, it's because Gwyneth is singing Do You Want to Touch Me There on TV right now. jsw |
#3
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Angle iron
On Thu, 30 Jun 2011 21:11:07 -0400, "Jim Wilkins"
wrote: wrote in message .. . I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC I think your 'extruded' angle is hot-rolled steel, the 'formed' angle is cold-rolled. Is it smooth and zinc-plated? Typically cold-rolled has a higher yield point since it has already been deformed and moved up the stress-strain curve by the rolling process, while hot rolled steel is in the softer annealed condition. If that's unclear, it's because Gwyneth is singing Do You Want to Touch Me There on TV right now. jsw The "formed" angle has internal and external radius - Rolled angle has internal radius and square outer edge. GENERALLY the rolled material is stiffer ( at least torsionally) than the formed angle but it does depend on the alloy and heat treating, if any. |
#4
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Angle iron
"Jim Wilkins" wrote: I think your 'extruded' angle is hot-rolled steel, the 'formed' angle is cold-rolled. Is it smooth and zinc-plated? Typically cold-rolled has a higher yield point since it has already been deformed and moved up the stress-strain curve by the rolling process, while hot rolled steel is in the softer annealed condition. Moreover, hot rolled angle has a fillet on the inside of the angle that gives extra strength there. Angle made by forming sheet doesn't have that. I have no idea how commercial quantities are made. I'd surmise: by rolling or drawing a strip. But no fillet in any case. -- Mike Spencer Nova Scotia, Canada |
#5
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Angle iron
wrote in message ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC Check with steel suppliers. Many have "rems" or "drops" that they sell for $.30 (that's 30 cents a pound). If you're lucky, you can get what you need for a couple of bucks. Worth a shot. Steve |
#6
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Angle iron
wrote in message ... On Thu, 30 Jun 2011 21:11:07 -0400, "Jim Wilkins" wrote: wrote in message . .. I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC I think your 'extruded' angle is hot-rolled steel, the 'formed' angle is cold-rolled. Is it smooth and zinc-plated? Typically cold-rolled has a higher yield point since it has already been deformed and moved up the stress-strain curve by the rolling process, while hot rolled steel is in the softer annealed condition. If that's unclear, it's because Gwyneth is singing Do You Want to Touch Me There on TV right now. jsw The "formed" angle has internal and external radius - Rolled angle has internal radius and square outer edge. GENERALLY the rolled material is stiffer ( at least torsionally) than the formed angle but it does depend on the alloy and heat treating, if any. I may be misinterpreting what you're saying, but if it's stiffer, it's not because of alloy or heat treating. It could be stronger or weaker depending on alloy and heat treatment, but the stiffness is almost the same regardless of alloy (except for stainless, which is a little less stiff), and regardless of heat treatment. -- Ed Huntress |
#7
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Angle iron
Mike Spencer wrote:
"Jim Wilkins" wrote: I think your 'extruded' angle is hot-rolled steel, the 'formed' angle is cold-rolled. Is it smooth and zinc-plated? Typically cold-rolled has a higher yield point since it has already been deformed and moved up the stress-strain curve by the rolling process, while hot rolled steel is in the softer annealed condition. Moreover, hot rolled angle has a fillet on the inside of the angle that gives extra strength there. Angle made by forming sheet doesn't have that. I have no idea how commercial quantities are made. I'd surmise: by rolling or drawing a strip. But no fillet in any case. One could make a larger bend radius, which would be like having a fillet. -- Richard Lamb http://www.home.earthlink.net/~cavelamb http://www.home.earthlink.net/~sv_temptress |
#8
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Angle iron
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#9
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Angle iron
On Jun 30, 6:48*pm, wrote:
I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC No real hardware stores around? Virtually every one around here has a rack of rolled steel shapes in 3-6' lengths. Not as cheap as at a steel yard by the pound but very convenient on a Sun. afternoon. Ace is da place. Stan |
#10
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Angle iron
On Sat, 2 Jul 2011 09:12:23 -0700, "Jon Danniken"
wrote: wrote: I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. [snip] 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Because you're buying it from home despot. Look up Steel in the yellow pages and go to your local steel or scrapyard. They will sell you the stuff, and LOTS of other stuff, by the pound, or by the foot, at prices that will probably be 1/3 or less what you are paying at the despot. It's a lot more fun, too. I wish. I went to three steel yards that day. The best I could do was a 20 ft length for $18 provided I bought 6 of them (minimum $100 sale). If I bought it from the dealer they sell to, the price doubles after cutting. Not that they had any... In the end I got it in Home Hardware. I just did not trust that formed stuff in HD. Interestingly, about a month ago I went to Nanaimo "Metal supermarket". When I compared the prices from there (factoring in cutting but not the travel) Home Depot was actually cheaper if one bought the 48" lengths of comparable stock. I took the opportunity to ask about other things in the said steel yards. Tha availability of stuff was very limited (12L14, 303, 416 etc.) The same story in Nanaimo. OTOH I got a line on small quantities of aluminium so it was not altogether a waste of time. Michael Koblic, Campbell River, BC |
#12
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Angle iron
wrote:
I wish. I went to three steel yards that day. The best I could do was a 20 ft length for $18 provided I bought 6 of them (minimum $100 sale). If I bought it from the dealer they sell to, the price doubles after cutting. Not that they had any... I guess I'm lucky that I've got a local steel merchant ( http://www.coyotesteel.com/ ) with a "no minimum order" policy. Really friendly, and they're always happy to get me whatever I need, even when they are busy supplying large orders for the big guys. Jon |
#13
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Angle iron
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#14
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Angle iron
"Steve B" wrote in message ... wrote in message ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC Check with steel suppliers. Many have "rems" or "drops" that they sell for $.30 (that's 30 cents a pound). If you're lucky, you can get what you need for a couple of bucks. Worth a shot. I'm pretty sure the days of 30 cents/pound are long gone. I purchased three beams for the house I'm building, new material, that cost me right at 33 cents/pound---but that was a few years ago. I expect that you're going to pay no less than 50 cents/pound now, and probably more. Harold |
#15
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Angle iron
On Jul 2, 11:00*pm, wrote:
... *That's what comes of living "out in the sticks" where your suppliers are limitted, largely because their market is limitted. ... I bought angle and channel for several projects from a place "out in the sticks" that sells recycled pallet racks. jsw |
#16
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Angle iron
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#17
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Angle iron
"Larry Jaques" wrote in message ... On Thu, 30 Jun 2011 17:48:03 -0700, wrote: I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. That might be shaped hot, via bending rollers. (like metal roofing) So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? Given the same alloy, absolutely. Look at the crosssection. Extruded is much thicker at the root of the V. 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Only in the Borgs or retail stores. In real metalmonger stores, it's cheapest in 20' lengths. -- Just getting back after a farkin' virus ate my computer. I'm still without any email or usenet archives. sigh Angle iron (steel) is not extruded. The standard structural product is hot roll-formed. Cold-roll-formed angle has uniform thickness throughout, but the hot-rolled shapes are squeezed in their plastic state so they're thicker at the bend and thin out at the edges. It is possible to extrude steel, and it's done, for more complex shapes. I've never heard of it being done for simple angles. It involves using molten glass as a lubricant and it's fairly involved, unlike aluminum extrusion. Cold-formed steel is inherently stronger because of the effect of work-strengthening, but the shape of the hot-rolled product is superior in structural terms. Pound-for-pound, there is a tradeoff, but I think the hot-rolled comes out with a strength advantage due to shape, over the strength advantage of cold-rolled due to work-strengthening. -- Ed Huntress |
#18
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Angle iron
"Harold & Susan Vordos" wrote in message
... "Steve B" wrote in message ... wrote in message ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC Check with steel suppliers. Many have "rems" or "drops" that they sell for $.30 (that's 30 cents a pound). If you're lucky, you can get what you need for a couple of bucks. Worth a shot. I'm pretty sure the days of 30 cents/pound are long gone. I purchased three beams for the house I'm building, new material, that cost me right at 33 cents/pound---but that was a few years ago. I expect that you're going to pay no less than 50 cents/pound now, and probably more. Harold Reply: Go to Goodwill or other thrift stores. Lots have bed frames, that they will give you or sell for a buck or less. Good source of angle iron. |
#19
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Angle iron
"Califbill" wrote in message m... ... Reply: Go to Goodwill or other thrift stores. Lots have bed frames, that they will give you or sell for a buck or less. Good source of angle iron. Bed rails are good strong steel, somewhat like 1045. I think they are recycled manganese-steel railroad track. They are more difficult to saw, drill and weld than hot-rolled mild steel. jsw |
#20
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Angle iron
"Jim Wilkins" wrote in message ... "Califbill" wrote in message m... ... Reply: Go to Goodwill or other thrift stores. Lots have bed frames, that they will give you or sell for a buck or less. Good source of angle iron. Bed rails are good strong steel, somewhat like 1045. I think they are recycled manganese-steel railroad track. They are more difficult to saw, drill and weld than hot-rolled mild steel. jsw They're *******s to weld. The HAZ ends up large and very brittle. If you do weld a bedframe, then normalize around the weld for at least a few inches - preferably more. Don't ask how I know. :-) -- Jeff R. |
#21
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Angle iron
"Jeff R." wrote in message u... "Jim Wilkins" wrote in message ... Bed rails are good strong steel, somewhat like 1045. I think they are recycled manganese-steel railroad track. They are more difficult to saw, drill and weld than hot-rolled mild steel. jsw They're *******s to weld. The HAZ ends up large and very brittle. If you do weld a bedframe, then normalize around the weld for at least a few inches - preferably more. Don't ask how I know. Jeff R. The angle melts more easily than 60xx filler rod and may pull away from the bead. I switched to bolted joints so I don't know if a higher strength (lower melting) rod would help. jsw |
#22
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Angle iron
"Jim Wilkins" wrote in message ... "Jeff R." wrote in message u... "Jim Wilkins" wrote in message ... Bed rails are good strong steel, somewhat like 1045. I think they are recycled manganese-steel railroad track. They are more difficult to saw, drill and weld than hot-rolled mild steel. jsw They're *******s to weld. The HAZ ends up large and very brittle. If you do weld a bedframe, then normalize around the weld for at least a few inches - preferably more. Don't ask how I know. Jeff R. The angle melts more easily than 60xx filler rod and may pull away from the bead. I switched to bolted joints so I don't know if a higher strength (lower melting) rod would help. jsw Noted. It wasn't the process of welding that caught me up. That semed to go well. It was the extreme embrittlement around the cooled weld. Snapped like plaster. -- Jeff R. |
#23
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Angle iron
On Aug 11, 8:31*am, "Jim Wilkins" wrote:
They're *******s to weld. The HAZ ends up large and very brittle. If you do weld a bedframe, then normalize around the weld for at least a few inches - preferably more. Don't ask how I know. Jeff R. The angle melts more easily than 60xx filler rod and may pull away from the bead. I switched to bolted joints so I don't know if a higher strength (lower melting) rod would help. jsw I have had good luck with Mig welding. But do not use bed frame angle iron for things that have much stress. Around here the Goodwill and Salvation Army stores do not have cheap bedframes. Dan |
#24
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Angle iron
"Califbill" wrote in message m... "Harold & Susan Vordos" wrote in message ... "Steve B" wrote in message ... wrote in message ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. I believe that "regular" angle iron is made by extrusion. These pieces looked like someone put a 1.5" flat in a brake and bent it at right angles (I believe the term for this is "formed"). I was reluctant to buy this as it just did not *look* as strong as the regular extruded type. I tried to work out the relative strengths from the Machinery's Handbook but without success. So the questions a 1) Am I right in assuming that the extruded angle iron is stronger compared to the formed type? If so by how much? 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Michael Koblic, Campbell River, BC Check with steel suppliers. Many have "rems" or "drops" that they sell for $.30 (that's 30 cents a pound). If you're lucky, you can get what you need for a couple of bucks. Worth a shot. I'm pretty sure the days of 30 cents/pound are long gone. I purchased three beams for the house I'm building, new material, that cost me right at 33 cents/pound---but that was a few years ago. I expect that you're going to pay no less than 50 cents/pound now, and probably more. Harold Reply: Go to Goodwill or other thrift stores. Lots have bed frames, that they will give you or sell for a buck or less. Good source of angle iron. I visited my local steel distributor yesterday. New structual steel is now $1.16 per pound if you buy mill length 20'. Stuff from thier scrap bin is ..53 per pound. Best Regards Tom. |
#25
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Angle iron
On Thu, 11 Aug 2011 05:49:05 -0700, azotic wrote:
"Califbill" wrote ... "Harold & Susan Vordos" wrote ... "Steve B" pittmanpirate@hotmail wrote ... mkoblic@gmail wrote ... I needed some 3/4"x3/4"x1/8" angle iron for a project. Previously I bought a 3-foot length in Home Depot so I headed back there. They had an item with that description but it did not look like what I had bought before. [snip] 2) Is there a good reason why a 72" length of stock should cost 1.5x as much per inch as a 36" length? Check with steel suppliers. Many have "rems" or "drops" that they sell for $.30 (that's 30 cents a pound). If you're lucky, you can get what you need for a couple of bucks. Worth a shot. I'm pretty sure the days of 30 cents/pound are long gone. I purchased three beams for the house I'm building, new material, that cost me right at 33 cents/pound---but that was a few years ago. I expect that you're going to pay no less than 50 cents/pound now, and probably more. I visited my local steel distributor yesterday. New structural steel is now $1.16 per pound if you buy mill length 20'. Stuff from their scrap bin is .53 per pound. A couple of years ago I paid 20 cents per pound at a South Dakota yard I visit when driving through there, up from 15 cents a pound a few years before that. 3 months ago I bought a few hundred pounds at 30 cents per pound. Here are some pictures of some 15-cent-per-pound chrome-plated-drops bins and rust-plated-drops bins in 2002, all of which are long gone, replaced by other stuff & now twice the price: http://www.flickr.com/photos/61108728@N04/sets/72157627409702492/ -- jiw |
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