[PSUBS-MAILIST] Steel Grade Query

Mon Apr 23 09:33:21 EDT 2018

thanks all

I was just interested in 106B as I keep getting offered that.  However, ive
found some other suppliers so will go with a516.  We know that's ok.

Also, I may be able to go for ABS classing or similar, so will stay on
target.

Thanks
James

On 23 April 2018 at 00:02, Sean T. Stevenson via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Just to add to that - pressure vessel steels are so classed largely
> because of their fracture toughness, and not necessarily their strength.
> Heat treatment condition will play a role, but you probably want the low
> temperature rated steel if you're deviating from the approved alloys.
>
> For reference:
>
> Pressure Boundary Material Specifications
>
> Plates (2010)
>
> Plate materials of pressure boundaries, including attachments, are to
> comply with one of the following.
>
> Steel (2008):
> ABS Hull Grades E, EH32, EH36;
> U.S. Navy Grades HY-80 and HY-100 per MILS-16216;
> ASTM A516 Grades 55, 60, 65, 70;
> ASTM A537 Class 1 and 2;
> ASTM A517 Grades, A, B, E, F, J
>
> Aluminum:
> ASTM B 209 alloy 6061-T6;
> ASTM B 928 alloys 5083, 5086, 5383, 5456 (see Section 5 of these Rules)
>
> Titanium Alloys:
> ASTM B265 Grade 5
>
> Stainless Steel:
> ASTM A240 Type 304 or 316
>
> Acrylic Plastics (cast polymethyl methacrylate): ASME PVHO-1 and Section 7
> of these Rules
>
> Bolts, Extrusions, Forgings, and Shapes
>
> Materials of bolts, extrusions, forgings, and shapes are to comply with a
> recognized standard at least of similar quality to the plate materials
> specified in 4/3.1 (e.g. MIL-S-23009 for HY-80 forgings, ASTM A350 LF2 or
> LF3 for forgings comparable to ASTM A516).
>
> Materials Complying with Other Standards
>
> Consideration will be given to the use of material complying with other
> recognized standards suitable for the service intended. Approval of the use
> of other materials will depend on satisfactory evaluation and approval of
> the specifications prior to construction.
>
> Sean
>
> -------- Original Message --------
>
> On Apr 22, 2018, 13:48, Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> 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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>>
>>
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>
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