[PSUBS-MAILIST] Steel Grade Query

[Cliff Redus via Personal_Submersibles]

See table below of two important steel strength parameters, ultimate
tensile strength and tensile yield strength.  At the very least, I would
pick a steel that matches or exceeds the A516-70 spec.  If you are trying
the get the boat ABS classed., will be a pain in the butt and expensive to
use a non-ABS approved material.  If you are just trying to build a safe
psub, pipe will work if the welding is done to code. Oil and gas industry
uses a lot of API 5L X56 pipe so it is easy to get.

I hesitated to respond this this query as there is a lot evolved to
specifying steel.  Much more than can be covered in an email.

Cliff


Tensile Strength Min Yield Strength
Description Common Use psi Mpa psi Mpa
ASTM(A) 516-70  Plate for Boilers and Seperators 70,300 485 37,700 260
A106 Gr C Seamless Pipe 70,000 483 40000 276
A333 Gr 6 Seamless Pipe 60,000 415 35,000 241
API 5L X56 Seamless Pipe 71,100 490 56,600 390

On Sun, Apr 22, 2018 at 2:35 PM, Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> You can change the parameters of the calculator to give you an accurate
> analysis of any steel.  I show 1276 feet max depth for A333Gr3.
>
>
> ------------------------------
> *From:* James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Friday, April 20, 2018 9:25 AM
> *Subject:* [PSUBS-MAILIST] Steel Grade Query
>
> Hi All.
>
> I am purchasing battery pods for my new sub.  I am attempting to get
> 14"NB(355mm) x 98" (2500mm).  Standard weight (9.52mm)
>
> Psubs calculator give ABS depth of 1160 feet (353m) for A516gr70
>
> However, I don't seem to be able to get a516 in that for standard pipe.
>
> I keep getting offered A106grB or A333Gr3 or Gr6.
>
> 106 seems to be high temp, 333 low temp.
>
> Does anyone know about these and if they will be ok for battery pods.
>
> Its a lot cheaper to get std wt pipe than it is to get a516 custom
> rolled......
>
>
>
> Many thanks
> james
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