Similarity between USI-SAR80T and SA-517 1

[victorpbr]

Hi,

There is a metal produced in Brazil, by USIMINAS denominated USI-SAR80T, it is a quenched and tempered metal and it told to be ~similar~ to SA-517, however I do not know to which grade. I have not be able to fit it properly into a specific grade. Could someone help me out?

Here is the metal composition according to the vendor
C - 0.19% max
Si - 0.55% max
Mn - 0.6% - 1.2%
P - 0.030%
S - 0.030%
Nb + V - 0.15% max
B - 0.0060% max
Cr - 0.4% - 1%
Mo - 0.25% - 0.60%

Below is a composition found in a material certificate
C - 0.12 ; Mn-0.95 ; P - 0.018; S-0.005; Cr-0.73; Ni - 0.01 ; Mo - 0.49; Al - 0.043; Nb-0.001; V-0.036; Ti-0.015;Sn-0.001; N-0.042; B - 0.0021; Ca-0.002; Sb-0.001

Kind Regards
victorpbr

 

[metengr]

If you could not type this material into an SA 517 Grade it means these materials are not to be substituted between each other. You also need to evaluate the minimum strength and ductility between the two materials.

 

[pradipgoswami]

Here is an extract from the website "USIMINAS". I understand they're major producers of all type of steel in Brazil. General description tells this steel is equivalent to SA 517, however does not specify which grade. As you know, SA 517 is manufactured conforming to a number of grades.

Compare the above grade to SA 517 as per the following link:

https://www.ssab.ca/products/commercial-steel/products/astm-a517

and ASME SA517 and move forward.
Thanks.


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[victorpbr]

Hi, thank you all for your inputs!

Some updates, I've contacted them by email, and they said that the equivalence is to A514 gr B/H. This material is not listed under ASME II, so probably not approved for pressure vessels.

What grind my gears is that on their page as padripgoswami mentioned, they classify USI-SAR80T also for use on pressure vessels with similarities to SA-517. (full page with complete specs here:

http://www.usiminas.com/solucoes/wp-content/uploads/sites/5/2013/12/su-catalogo-online.pdf

, page 19 it quotes the similarity, page 21 contains the specs)

Anyone has any input or experience on this matter? Do you see any problems on using this material for vessels operating at -29C to 30C?

 

[pradipgoswami]

Hi Victor few queries,
-What's the service, and the operating media.
-Any possibility of "lethal service" or "sour service", or known cases of originating EAC (SCC) in service.
-What's the design code?
-Is this material accepted by the design code or the code of construction?
-Are there any prior experiences on designing with this material(exact grade)for the intended service?

Appreciate your response. All of the above points needs evaluation beforehand ?

Thanks


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[victorpbr]

Hi Pradip,

-Intended use is for construction of road tanker vessel for transportation of refrigerated CO2, operating pressure of 24,6 bar and temperature of -29C.

- Here in brazil this is classified as transportation of dangerous goods, however do not know if it fits the categorization of lethal or sour service. CO2 if kept away from water is not corrosive.

- Design code is ASME VIII div 1 (I'm aware of ASME XII, but local regulations enforce the use of ASME VIII div 1, even though ASME XII would be more adequate).

- USI-SAR80T is not listed under ASME II, that why I'm investigating this similarity with SA-517

- There are some companies already using this material on the fabrication of similar equipments, and I have not heard of any problems with it. USIMINAS itself advertises one of the uses of the steel to pressure vessels where weight reduction is an important factor.

Thank you for you attention,

Victor

 

[pradipgoswami]

Hi Victor,

Thanks for your response. It's difficult to comment on the requirements for refrigerated C02 tankers in Brazil, without knowing all the pros cons and the local regulations.You need to research about this and come conclusions on your own.

SA 517 steel is a dangerous steel, it's good for weight reduction, as the UTS almost twice of that of SA 516/70. The dangerous side is the excessive hardness in weld and HAZ which could initiate SCC in some service medias such as ammonia.

There're some bulletins in National Board of Boilers Website on failures SA 517 steel in Liquefied Ammonia Service. The damage mechanisms for refrigerated C02 could be different, but it needs research as sudden failure of such tankers on the road could be catastrophic.

Thanks.

http://www.nationalboard.org/Index.aspx?pageID=164&ID=182

http://www.nationalboard.org/Index.aspx?pageID=440

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[EdStainless]

Following Pradip's comment, this material would be very difficult to qualify welds for low temp impact toughness.
In the US highway usage has addition sets of rules to follow.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[victorpbr]

Thank you for the links provided Pradip, I'll read them carefully, it is very imporant to be aware of failures mechanisms.However I do not think that this would be a major concern for CO2, since it is noncorrosive. We usually use stainless steel for vessels when the fluid is ammonia.

EdStainless,
Can you point me out to these additional set of rules? Local regulations here in Brazil regarding these matters are very similar (not to say a cheap copy) of some outdated US regulations. Probably it is a good place to start.

Regards,
Victor

 

[metengr]

If you intend to fabricate transport vessels of the type to either ASME Section VIII Div 1 or ASME Section XII you must use approved material listed in Section II, Part D or approved Code Cases. No execeptions, substitutes or equivalents in pressure vessel materials.