Looking for High Strength Weldable Tube

[Ibreakstuffdigitally]

Over the past few years we've started using ASTM A514 plate, as well as some very similar materials of different specifications.

It's been a great material for us. The weld consumables have been a bit tricky from time to time, but our fabricators have had little difficulty qualifying proceedures which test out well, and the material itsself has been easy to get.

We would really like to get something similar in medium-small round tube, down to 3" OD or so.

Our current material is 4130, but with that material we're either:

Welding it in a heat treated state (This is tricky, since ductility can be as critical as strength, and our qualification testing has shown that achieving ductility, particularly low temperature ductility in a weld done on heat treated 4130 does not appear to be in any way trivial)

Heat treating it post weld (with many of our frames, distortion becomes rather profoundly problematic)

Using material in the annealed condition (we lose a lot of strength, but it works)

I've called a few steel suppliers about a tube material "like A514" but I've not encountered any success. Does anyone have any suggestions for leads I might try?

 

[metengr]

Look at ASTM A 714 for alternate HSLA steels. Welded and seamless are listed;

Abstract

This specification covers standard requirements for seamless and welded high-strength low-alloy steel pipe NPS ½ to NPS 26, inclusive. The material shall be utilized in pressure piping service, and other general purposes, where savings in weight or added durability are important. Heat and product analysis shall be performed wherein different grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, copper, vanadium, nickel, chromium, and molybdenum. The material shall conform to the required tensile properties such as tensile strength, yield strength, and elongation for the grade of Class 2 or Class 4 pipe specified. The steel shall undergo the following mechanical tests, namely: bend test, flattening test, and hydrostatic test.