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.
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?
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