4130 Steel Tube or 1020 Steel Tube for a Ladder Chassis

[nrg500]

Are SAE standard rectangular steel tubes available here in the Philippines ?

What should I use for a ladder chassis of a car, 4130 or 1020 ?


I did some searching on Google, 4130 is stronger but also costs more.

I'm thinking of using 4130 on the core structure and 1020 on the crumple zones of the ladder chassis. If I choose that path, can I weld different grades of steel like welding 4130 and 1020 together ?

The dimensions of the rectangular steel tube is 4" x 3" x 1/8". I have thought of using 3" x 3" x 3/16" square tubes but computation shows that 4" x 3" x 1/8" is stronger and lighter for the same length


(To the admin and moderators, sorry if this placed in the wrong section. I can't find a specific section for questions about chassis. I tried posting in the RnD section but it seems that only members with specific rights can post new threads in that section)

[nrg500]

I inquired in a local steel manufacturer here in the Philippines, they said they don't save SAE standard steel tubes

They offered me ASTM A36. Can that be used for a ladder chassis of a car ?

The dimensions of the rectangular steel tube is 4" x 3" x 1/8"