[PSUBS-MAILIST] HY-80 to HY-100

[Phil Nuytten via Personal_Submersibles]

Scott/Alec
Both HY-80 and HY 100 are difficult to form and, most problematical, require special welding procedures - quite different than 516 or other mild steels. If you plan to certify, then the certification agency must review and accept the detailed weld procedure and will ask for weld coupons that have been tested and passed. When we first started using high strength steels it took our weld guys several months of trying the procedures they had been advised to use and to, finally, develop their own version of a technique that would pass the required tests. We were only able to find one supplier of HY80/100 in north America and they were uber expensive. We also had to fly a certified surveyor in to the mill to stamp the steel sheets  with his mark– and then, later,  to transfer the marks when we cut the steel prior to forming. 
‘Course, iffen it was easy then ev’rybody’d be doin’ it!!
Phil

From: mailto:personal_submersibles at psubs.org 
Sent: Wednesday, January 14, 2015 12:50 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] HY-80 to HY-100

That would make sence. 
Thanks,
Scott Waters


Sent from my U.S. Cellular® Smartphone


-------- Original message --------
From: Alec Smyth via Personal_Submersibles 
Date:01/14/2015 2:15 PM (GMT-06:00) 
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] HY-80 to HY-100 


I've always heard HY-100 is quite susceptible to cracking, and thus much harder to fabricate.  

Alec

On Wed, Jan 14, 2015 at 11:50 AM, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

  So the tinsel strength of HY-80 is 80,000 psi and HY-100 is 100,000 psi, makes since. Why does Phil Nuytten go with HY-80 on the deep worker 3000? It would seem like you would want to go with HY-100 just for added safety. Perhaps HY-100 is harder to weld or more expensive?

  Thanks,
  Scott Waters


  Sent from my U.S. Cellular® Smartphone


  -------- Original message --------
  From: "Sean T. Stevenson via Personal_Submersibles" 
  Date:01/13/2015 9:06 PM (GMT-06:00) 
  To: Personal Submersibles General Discussion 
  Subject: Re: [PSUBS-MAILIST] HY-80 to HY-100 


  On 2015-01-12 10:35, via Personal_Submersibles wrote:

    A little update on my research. I have not given up on HY-80 or HY-100 compared to 516 gr70. I finally found a very good supplier for HY-80 - HY-100. I am getting over the hurdles of finding this stuff, the next hurdle is the welding part of it. Still learning, but can someone tell me the differences in HY-80 compared to HY-100? 

    Thanks,
    Scott Waters 


  HY-80

  HY-100

  Sean



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