Re: [PSUBS-MAILIST] o-ring hull penetrations

[MerlinSub@t-online.de (Carsten Standfuß)]

Hi Alec

I use the same steel they use during WWII for the XXI boats. 
The old name was St52-3 the new name is S 355 J2G3 .
Its a steel with a Rm of 510-610 N/mm2 (ultimate tensile strength)
and a Re (0,2 border) of 355 N/mm2 (yielding point).  
The reason for that steel is that it is a high tensile steel 
which is easy to weld - if not to cold. 

For normal porpose for example the free flooding sail I use
RSt 37-2 or new name S 235 JRG 2 with a
Rm of 360-440 N/mm2 and a Re of 235 N/mm2. 
Its about 20% cheaper than the St52-3 steel and easy
to weld. 

For units conversion look for "units and metric" in the archive files..

Carsten

Alec Smyth schrieb:
> 
> Carsten,
> 
> What steel are you using for the hull?
> 
> -Alec
> 
> -----Original Message-----
> From: MerlinSub@t-online.de [mailto:MerlinSub@t-online.de]
> Sent: Monday, December 11, 2000 1:37 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] o-ring hull penetrations
> 
> I forgot to tell:
> The next days I will weld my
> stainless steel hatch seats rings for th main entrance
> (700/600 mm diameter, 20mm thickness)
> (2,3/1,97 ft diam., 0,8 inch thick)
> to the entrance tower pipe.
> (700/672 mm diameter, 14 mm thickness)
> 
> Acording to my weld shop there will be no problems
> with the right wire. Both steel should be not to cold
> during welding. For this reason I will heat my garage
> on/two hours before start welding. Also I will generate
> some extra heat to the first welding start point with a
> hot air gun.
> 
> Carsten
> 
> Carsten Standfuß schrieb:
> >
> > Phil Nuytten schrieb:
> > >
> > > Alec:
> > >         Make the hull insert out of stainless - it welds well to mild
> > > steel.
> >
> > Thats the way.. but be careful with the welding stick or the welding
> > wire. For my MiG welder I use 3 kinds of wires :
> >
> > 1.)Wire for black steel to black steel (all normal kinds of not
> > stainless steel)
> > 2.)Wire for white steel to white steel (all normal kinds of stainless
> > steel)
> > 3.)Wire for white steel with black steel (not stainless steel with
> > stainless..)
> >
> > You should not use 1.) for white steel or for conections between
> > black and white. You should also not use 2.) for conections
> > between black and white because there is a risk of cracks.
> > Only 3.) is for black/white weldings.
> >
> > Unfortunalty we have other numbers here for the wires:
> > 1.) (black) called here OK Autorod 12.56 as Mig wire 18 Kg rolls
> > 2.) (white) called here OK Autorod 16.31 as Mig wire 15 kg rolls
> > 3.) (black with white) called here OK Autorod 16.95 as Mig wire 15 kg
> > rolls
> > number 3.) has also the material number stainless steel 1.4370
> >
> > You will maybe find more information on the WWW.esab.com
> > or at there office in
> >
> > USA
> > ESAB Welding & Cuttings Products
> > Florence, SC
> > Tel. 001 843 669 44 11
> > fax. 001 843 664 44 58
> >
> > or
> > Canada
> > ESAB Group Canada Inc.
> > Missisauga, Ontario
> > Tel.001 905 670 020 20
> > Fax.001 905 670 48 79
> >
> > I have all other office adress around the world here if nessesary
> >
> > During Mig welding the inserts - cover the surface of the insert
> > near the welding area with small steel or aluminium plate to protect
> > the surface from hot sparks points.
> >
> > regards, Carsten