SA 516 at mdmt -60C

rinosa · **Joined:** Thu Nov 05, 2009 4:51 pm **Posts:** 11

Dear All,

I have to use SA 516 70 for pressure vessel fabrication. The problem is that MDMT is -56C.
The impact test is mandatory, but what do I have to expect in terms of test results ?
Can anyone give me some suggestion about it ?

Thank You

Javed Nasir · **Posted:** Fri May 06, 2011 6:04 pm

See UG-84

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

rinosa wrote:

Dear All,

I have to use SA 516 70 for pressure vessel fabrication. The problem is that MDMT is -56C.
The impact test is mandatory, but what do I have to expect in terms of test results ?
Can anyone give me some suggestion about it ?

Thank You

I understand what you mean. Maybe a properly heat treated plate by the steelmaker could reach an acceptable result. You will face problem with your PQR and production test plate. In HAZ the result will hardly reach 20 Joules. You should opt for low Nickel alloy. base metal (plate) and weld metal
MG

Zaman · **Joined:** Tue Mar 29, 2011 12:13 pm **Posts:** 4

Dear,
The addition of nickel to steels improves their low temperature toughness thus:
0.5 % Ni permits LT60 duty; 1.5 % Ni LT80; 3.5 % Ni LT80/100; 5 % Ni LT120; 9Ni LT196.

So you must prefer the Ni alloyed steel..

Regards
Qamar uz Zaman

chaulklate · **Joined:** Thu May 03, 2007 9:04 pm **Posts:** 15

Side note...keep in mind your weld procedures will also need to be rated and tested to the same temperature.

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

chaulklate wrote:

Side note...keep in mind your weld procedures will also need to be rated and tested to the same temperature.

Sure, of course, your welding material to meet those Cv requirements should be Ni low-alloyed.
Mauro

SA 516 at mdmt -60C

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