Super duplex SS: UNS S32750 Vs S32760

[Bathula Raghuram (Mumbai - PIPING)]

I could not find any reference from major manufacturer like Sandvik, Avesta on S32760 grade.

Can any body give inputs on S32760 in terms of weldability? Which one is better in terms of weldability?

[p_cha...@mail.bg]

Dear Sirs,
 
Particulars about the recommendation for welding of superduplex grades (S32750, S32760, etc.) can be found in EN 1011-3.
 
Best regards
Chavdarov
TÜV Rheinland GmbH
 
 
Цитат от "Bathula Raghuram (Mumbai - PIPING)" <R.Ba...@ticb.com>:

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[Tjitte K. Schutter]

Dear mr. Bathula,

 

underneath you may find some data of interest. Source: ILI

 

Regards,

Tjitte Schutter

 

ILF Consulting Engineers

Munich, Germany

 

 

F53, UNS S32750 vs. F55, UNS S32760

(ASTM A182)

 

Chemical Compositions

	S32750		S32760
Elements	Min %	Max %	Min %	Max %
C		0.030		0.030
Cr	24.0	26.0	24.00	26.00
Cu		0.50	0.50	1.00
Fe	Remainder		Remainder
Mn		1.20		1.00
Mo	3.0	5.0	3.00	4.00
N	0.24	0.32	0.20	0.30
Ni	6.0	8.0	6.00	8.00
P		0.035		0.030
S		0.020		0.010
Si		0.80		1.00
W			0.50	1.00

 

Physical Properties:

 

F53
- Repair by welding: Electrodes: 25% Cr, 7% Ni, 4% Mo;
- Recommended preheat and interpass temperature range: Not required.
- Minimum post weld heat treatment temperature: Not required.

 

F55
- Repair by welding: Electrodes: 25% Cr, 7% Ni, 3.5% Mo;
- Recommended preheat and interpass temperature range: Not required;
- Minimum post weld heat treatment temperature: Not required.

 

Heat Treatment:

 

F53
After hot working, forgings shall be cooled to a temperature below 1000 F (538 C) prior to heat treatment.
Material shall be supplied solution treated and quenched.
Solutionize at 1880 F (1025 C) minimum and liquid quench to below 500 F (260 C).
Alternatively, immediately following hot working, while the temperature of the forging is not less than the minimum solutioning temperature, forgings may be individually rapidly quenched as above.

 

F55
After hot working, forgings shall be cooled to a temperature below 1000 F (538 C) prior to heat treatment.
Material shall be supplied solution treated and quenched.
Solutionize at 2010-2085 F (1100-1140 C) and liquid quench to below 500 F (260 C).
Alternatively, immediately following hot working, while the temperature of the forging is not less than the minimum solutioning temperature, forgings may be individually rapidly quenched as above.

 

Additional Notes

 

F53
This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves and similar parts to specified dimensions or to dimensional standards such as various ASME specifications.
This grade is 25% chromium, 7% nickel, and 4% molybdenum, modified with nitrogen.
Products made to this specification are limited to a maximum weight of 10 000 lb (4540 kg).
The low alloy ferritic steels may be made by the open hearth, electric furnace or basic oxygen process with separate degassing and refining optional.
The stainless steels shall be melted by one of the following processes:
a) Electric furnace (with separate degassing and refining optional);
b) Vacuum furnace;
c) Either a) or b) followed by vacuum or electroslag consumable remelting.
In the Temperature column of the mechanical properties table, RT = Room Temperature.
The yield strength shall be determined by the 0.2% offset method.
In the chemical composition table, other elements include N and Cu.

F55
This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included are flanges, fittings, valves, and similar parts to specified dimensions or to dimensional standards such as ANSI specifications.
Products made to this specification are limited to a maximum weight of 10000 lb (4540 kg).
The low alloy ferritic steels may be made by the open hearth, electric furnace, or basic oxygen process with separate degassing and refining optional. The basic oxygen process shall be limited to steels containing not over 6% chromium.
The stainless steels shall be melted by one of the following processes:
a) - electric furnace (with separate degassing and refining optional);
b) - vacuum furnace;
c) - either a) or b) followed by vacuum or electroslag consumable remelting.
For this grade, because of difficulties that may be met in retaining nitrogen, vacuum melting or remelting processes should not be specified.
In the chemical composition table, %Cr + (3.3 x %Mo) + (16 x %N) shall be a minimum of 40.
In the Temperature column of the mechanical properties table, RT = Room Temperature.
The yield strength shall be determined by the 0.2% offset method.
Although corrosion testing is not required by this specification, this grade must be capable of meeting the intergranular corrosion test contained in supplementary requirement S10.

2009/4/9 Bathula Raghuram (Mumbai - PIPING) <R.Ba...@ticb.com>

[yusef rahimi]

hi My question: can you tell me a STANDARD about Riser Coating? I want to know about repair. how much Repair is allowed? (riser coating is Neoprene)

[piepe...@kpnmail.nl]

Dear Mr. Raghuram,

I have expirience with similar Super Duplex casted types (1.4417 /
1.4469 according to EN 10213, and 1.4470 according to SEW 410) because
i'm connected to a Foundry where they cast pump casings in these type
of alloys, and should say that weldability for both types is good when
you take the pre-cautions regarding interpass temperature and heat
treatment afterwards. Both EN 10213 and SEW 410 give guidelines for
welding and PWHT afterwards. For rough castings it's not a problem to
perform the mentioned Solution heat treatment afterwards but for
machined parts this could give a problem. Especially for such cases
it's important to keep your interpass temperature below 150 °C in
order to avoid undesirable microstructures afterwards.
This in contrast to the recommandations of Mr. Schutter in one of the
previous reactions.
Beside this it's important to use filler metals of similar composition
in order to guarantee corrosion resistance of weld metal similar to
the base metal, so when base metal consist Tungsten filler metal
should have this in the composition as well.

Best Regards,

Herman Pieper

On 9 apr, 12:16, "Bathula Raghuram \(Mumbai - PIPING\)"

[Harikrishnan N S]

Hi Experts

 

I recently came across a client spec which restricts the use of UNS S32760 SDSS.

 

From the chemical composition,  UNS S32760 has better corrosion resistance due to Cu and W additions.

 

Hence per corrosion point of view, S32760 is better than S32750. But is there any deleterious effects for Cu and W additions while welding. How is the weldability of S32760 compared to S32750?

 

Thanks and Regards

Harikrishnan