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Author Topic:   Roll cage tubing.
SS90
Member
posted November 10, 2003 11:05 PM
Building a new car. Went to order tubing for a cage from the local steel shop.Thay can get me .095-inch 50,000 tensile strength steel. The Steve Smith book states .095-inch wall tubing 1018 or 1020 mild steel. My question is what is 1018 or 1020?



snowman
Member
posted November 11, 2003 01:16 AM
The short answer is;The number tells you what kind of steel it is......The first two numbers indicate the classification.......10 is for low carbon mild steel......the last two numbers tell the mid point of the carbon content.....

We could discuss it some more if the short answer leaves you with questions.....I just don't want to blab forever if the short answer is all you need....lol

More to the point , Roll cages are constructed from ERW or DOM tubing.....DOM is a seemless tube and the ERW is a welded seem tube.......DOM is a better, stronger tube....it also cost twice as much.....

Most of the roll cage kits that people buy are made with ERW......

I personally reccomend DOM for at least the main cage.....and you can use the ERW for your front and rear clips and bracing.....

Sometimes, The retail steel yards won't know what grade of material they have......they may have to call thier supplier to get you the grade numbers..... Make sure that you are buying 1018 or 1020.

Good Luck,
Snowman




dode
Member
posted November 11, 2003 10:08 AM
That 50 ksi stuff is not 1020. It sounds like junk. From memory, 1020 steel should have a tensile strength of like 70 ksi, while 4130 should have a tensile strength of approximately 86 ksi, in commonly available forms. It doesn't sound like that is what you want.

John

powerglides
Member
posted November 11, 2003 11:12 AM
Snowman: DOM tubing is not seamless, Moly tubing is the only true seamless tubing.DOM is Drawn Over Mandrel then welded. It also has a better grade steel. Standard 1018 or 1020(electric weld tubing)is rolled and welded, not giving it a perfect roundness like DOM.
Nick19


snowman
Member
posted November 11, 2003 05:33 PM
I SHOULD HAVE KNOWN..,give the short answer and somebody is gonna pull my chain....lol

Hello RACER19S, I see that you are new to the forum. Welcome to the forum.

Technically, you are correct.....

However, to a person unfamiliar with steel classifications,( i.e. one who asks the question "What is 1018 or 1020"), calling DOM "seamless" makes sense because he won't be able to SEE a seam.........He is obviously dealing with a supplier who doesn't know what he is selling....I would hate for him to pay DOM price for ERW......or even worse,use 1010 for his race car.....He needs to know the grade of material he is buying.

Many refer to DOM as "seamless", and ERW as "regular" tubing........For example, Say you have a new guy working in the shop.....Show him that the "regular" mild tubing has a seam.....and that DOM does not.....otherwise he will end up making bumpers out of your DOM.......

I think I'm going to let it go at that......as Powerglides is going to take care of the steel......

Good Luck,
Snowman



SS90
Member
posted November 11, 2003 06:38 PM
Thanks for all the info from everyone. Snowman that is exacly what I was looking for. The steel shop that I went to makes farm equipment like feed troths, cow stanchions, steel hay wagons. He could get me anything I wont but this kind of thing is new to him.

BOSS I'll take you up on that, give you a call.

I love this sight!!! Nate SS90


gould
Member
posted November 11, 2003 09:50 PM
just dont use black pipe!!!!!

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Drive it in deep, and come out hard!!


RACER19S
Member
posted November 12, 2003 02:22 PM
Snowman: Thanks for the welcome to this forum, it is a nice place to hide when I'm supposed to be working.LOL As for the tubing, I have seen the seams on electric weld crack so I second your vote to build the main cage out of DOM. All the cars I have had built have it! Talk to ya later.
Nick19


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