ASTM A36 charpy

[ITBT]

Hi,

I am designing a lifting device on board a barge, where the design temperature is required to be 0F and above. Does the material need to go through charpy test? Say if I use ASTM A36 for the structure? Any boby familiar with ABS rules? Thanks.

 

[metengr]

Here is a web site for ABS rules

http://www.eagle.org/absdownloads/index.cfm

 

[rorschach]

Use A36 at 0F at your peril. It has HORRIBLE impact toughness at that temp. Better would be to use A516 Gr. 70 or even better A572 GR.50 which is stronger.

 

[metengr]

ITBT;
In addition to the above, you need to decide on your minimum design metal temperature (MDMT) first, and select an appropriate material for fabrication. I would recommend using AWS D1.1 Structural Welding Code for Steel for welding fabrication guidance, and have a licensed PE review your lifting rig design to assure safety.

 

[JoeTank]

I hope no one is confused about "A36". ABS has AH36, DH35 and LH36 grades of material. The ABS grades look pretty good with regards to CVN results. Are we talking about ASTM materials or ABS materials?

Steve Braune
Tank Industry Consultants

http://www.tankindustry.com

 

[IFRs]

There is a modified version of A36 that has better toughness. It is often called A36 MOD. Depending on the thickness, you may be OK. Is there a Charpy value you are looking for based on some code requirement?