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PostPosted: February 22, 2018, 2:51 pm 
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Location: San Jose, California
Hi Guys,

I am preparing to buy my metal tubing, but I am having trouble finding information on what grade I should be looking for.

I made a part cutlist for the voudu frame, and it turns to be around

13 pieces of 1'x1' 16 gauge tubing

and

1 piece of .75'x.75' 16 gauge tubing.

I contacted my local metal yard, and it was around ~$450 for A36 grade steel. What grade should I be looking for?


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PostPosted: February 22, 2018, 5:08 pm 
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The voice of reason
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Can they tell you more than "A36"? If you get it from OnlineMetals, they sell A500 and A513 and it is described as cold formed hot rolled steel. They also are willing to supply an MTR ( Material Test Report ) with your order for a slight additional charge. You do want an alloy like 1020 not 1010 which is very common. In 1020 there is %0.2 carbon as opposed to 1010 which is %0.1 carbon.

The material test report will tell you the result of a pull test on a specimen.

If you get stock that is hot rolled and formed it will have "mill scale" on it which needs to be cleaned down to bare metal for welding and that will take a good amount of effort. Good luck!

:cheers:

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PostPosted: February 22, 2018, 5:30 pm 
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I am checking onlinemetals, and I can see 1018 cold roll metal. Nothing else for cold rolled. I can see A513 for hot rolled. I was reading that I should stay away from hotroll because of the cleaning and not as strong as cold rolled.


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PostPosted: February 22, 2018, 5:44 pm 
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The voice of reason
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Yes. It's just confusing isn't it!? :rofl:

I bought the 1018 "hot rolled" from online metals and was happy with it. The MTR indicated it was quite strong and it did not have mill scale. It is claimed to be hot rolled and then cold formed. So it comes from a hot rolled sheet and then they bend it up and weld it. What I bought looked cold rolled too, but perhaps it is what is called "pickled and oiled" after rolling before it was formed?

It's frustrating and there is some chance you wouldn't get the same thing. What you don't want is the stuff with the heavy black coating of scale like you see on some angle iron etc.

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PostPosted: February 22, 2018, 6:15 pm 
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Do you mean this?

https://www.onlinemetals.com/merchant.c ... op_cat=197


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PostPosted: February 22, 2018, 7:18 pm 
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Where are you located? Someone might be able to point to the nearest place with the right stuff. A36 is normal run of the mill mild steel. I am using A513 for my build. Is the supplier cutting for you cause $450 seems steep. https://alcobrametals.com/guides/carbon-steel


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PostPosted: February 22, 2018, 7:58 pm 
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I live in the San Jose. CA area. I been looking for quotes


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PostPosted: February 22, 2018, 8:03 pm 
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Yea. Looking online I can buy A513 from online metals with shipping for $350. Not including the 3/4 inch and other metal i would need


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PostPosted: February 22, 2018, 8:22 pm 
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Online Metals is dropping the type designation.

A36 is the standard run of the mill hot rolled steel. When its turned into tubing its technically A513 Type 1.

A513 Type 5 is not seamless but it is DOM made from cold rolled steel - good enough to be used in cages for road racing. I don't think A513 Type 5 includes anything but round.

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PostPosted: February 23, 2018, 1:17 am 
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I bought this and several other types of tube for my project. The test reports indicated it was quite strong, but I don't have them in front of me so hate to quote a number. It was well over 50,000 psi strength in tension. I also used a lot of the round tube because most of the tube is round in my car.

http://www.onlinemetals.com/merchant.cfm?pid=10301&step=4&showunits=inches&id=845&top_cat=849

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PostPosted: February 23, 2018, 3:11 am 
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Try these guys, http://www.aedmotorsport.com/catalog/categories/materials

They were WAY cheaper than anyone else for my Cro-Mo tube even with shipping.
The more you buy the better the price.
They make On-line Metals look like pirates.
For my next purchase I intend to get mote than I need at the moment.

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PostPosted: February 23, 2018, 4:25 am 
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I think I'd like to refine my question to what's the a recommended grade to buy? I think so far A513 and anything above 1010 is okay?


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PostPosted: February 23, 2018, 10:59 am 
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It's going to partially depend on what shape and wall thickness you need.

The square hot rolled stuff is fine for a Locost. People have been using it for years. 1018, 1020, A513 Type 5, etc will also work.

Where are you located? I would look around some more - odds are someone local has tubing for a more reasonable price.

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PostPosted: February 23, 2018, 2:46 pm 
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I think I found what I needed. Basically find anything 1018/A513 or higher.


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PostPosted: February 23, 2018, 4:01 pm 
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I'm not sure what you mean by higher. If you managed to find something like 1040-1045 in square tube that would not be a good choice. 1018-1020-1025 is the range you are looking for. That would be very commonly available, the normal stuff you would run across. I have seen 1010 and that is not very strong. I think I've seen that in round tubing sold for chain link fences for example. I've seen that listed with a yield point under 20,000 psi, yikes... :shock:

I did find the test reports for my tubing and the different batches tested at from 59,000 to over 70,000 psi. The DOM tubing ( Drawn Over Mandrel round tubing ) tested higher.

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