[PSUBS-MAILIST] Best Steel to use for Sub Hull

Tue Oct 22 18:55:14 EDT 2013

One other thing comes to mind on this. Phil uses A516Gr70 in the DW2000s. It occurs to me that if there was a demonstrable benefit to A537, he would have used taken advantage of it. And he didn't, apparently. Interesting. Don't know why, though. Maybe it has something to do with welding stainless inserts in and the heat treatment thereof. Just a guess.
Vance

-----Original Message-----
From: JimToddPsub <JimToddPsub at aol.com>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Tue, Oct 22, 2013 6:42 pm
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Vance,
>From Leeco Steel's website:

A537 plate steel is heat-treated. As a result, it displays greater yield and tensile strength than the more standard A516 grades. A537 steel plate is ideal for both in boilers and pressure vessels, and is used in the oil, gas and petrochemical industry.

Nice to see it provides at least a brief comparison to A516.  I'm sure there are more variables to consider including cost.

Jim

In a message dated 10/22/2013 5:23:43 P.M. Central Daylight Time, vbra676539 at aol.com writes:

Jim,

A537 was used extensively, as well, especially in the early boats that   Perry built. Maybe you can figure it out. It seems that I recall being told   that it was somewhat harder to weld but had better cold-water-under-pressure   properties. Maybe Dr. Nuytten would weigh in on this, assuming he isn't up to   his ass in DW3000 alligators this week (which I suspect he is).

Vance

-----Original   Message-----
From: JimToddPsub <JimToddPsub at aol.com>
To:   personal_submersibles <personal_submersibles at psubs.org>
Sent: Tue,   Oct 22, 2013 4:18 pm
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub   Hull

Greg,

I should have clarified that.  It was a cut-and-paste   from a web site.  I'm more of a librarian in that I save info in an   organized fashion when I come across it so I'll have it available later when   the need arises.  That was the case in this instance.

Jim

In a message dated 10/22/2013 1:25:34 P.M. Central Daylight Time, jgcottrell2002 at yahoo.com   writes:

Thanks for the info, Jim.     It's good to know there is some one in the group that is also in the steel     industry.

Greg

From: "JimToddPsub at aol.com" <JimToddPsub at aol.com>
To: personal_submersibles at psubs.org     
Sent: Tuesday, October 22,     2013 12:59 PM
Subject: Re:     [PSUBS-MAILIST] Best Steel to use for Sub Hull

Maybe more detail than you really want to know, but here     goes:

ASTM A 516 or ASME SA 516 grade is one of the most     popular steel grades in market . 

It is     primarily intended for use in welded pressure vessels where notch toughness     is important. It comes in four grades 55, 60, 65 & 70. At Oakley Steel     we mainly sell 516 gr 60 and 516 gr 70. These grades cover a range of     tensile strengths from 55 - 90 MPa and this versatility explains much of the     specifications popularity. 

For plates thinner     than 40mm we normally supply them as rolled. Plates supplied above 40mm     thick are normalised. 

For A 516 grade 70,     which is one of our most popular steels, the ASME standard composition is as     follows (dependent on grade): 

Carbon 0.27 -     0.31% 
Manganese 0.79 - 1.3% 
Phosphorous 0.035%     max 
Sulphur 0.035% max 
Silicon 0.13 - 0.45%     

In a message dated 10/22/2013 11:53:12 A.M. Central Daylight Time, jonw at psubs.org     writes:

Generally, A516gr70       suffices for personal or recreational submarines.

Jon

On 10/22/2013       12:45 PM, Christopher Cave wrote:

Hello, 

What         is the best steel to use for a submarine hull. Someone mentioned marine steel         such as 316,316L or 317. Any suggestions or a website I can         review.

Thanks,

Chris 

Christopher Cave 

christophercave at yahoo.com

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