ASTM A790 UNS S32760 Super Duplex Stainless Steel Pipe ASTM A790 UNS S32760 Super Duplex Stainless Steel Tube
UNS S32760 known as Zeron 100 ,is a super duplex stainless steel supplied in the hot worked and solution annealed condition. As a super duplex stainless steel, it combines the desirable aspects of both austenitic and ferritic grades. The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >40, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media, and a Critical Pitting Temperature exceeding 50°C nb. versions of the PREN formula also include W as a positive influence on overall pitting resistance.
UNS S32760 ,Zeron 100 provides higher strength than both austenitic and 22% Cr duplex stainless steels, and is listed in NACE MR 0175 for sour service and ASME for pressure vessel applications.
A790 A790M UNS S32760 Super Duplex Stainless Steel Tubes Chemical Composition
ASTM A790 UNS S32760 |
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| C. | Cr. | Cu. | Mn. | Mo. | N. | Ni. | P. | S. | Si. | W. |
| 0.030% | 24.00- | 0.50- | 1.00% | 3.00- | 0.20- | 6.00- | 0.035% | 0.010% | 1.00% | 0.50- |
| max | 26.00% | 1.00% | max | 4.00% | 0.30% | 8.00% | max | max | max | 1.00% |
S32760 Super Duplex Steel Tubing Minimum Mechanical Properties at Room Temperature
(EN10088-3 1.4501 UNS S32760 OD19.05mm,WT1.65mm – Annealing and Pickeling)
| Tensile (UTS) | 678-692N/mm² | |
| 0.2% Proof Stress | 530 N/mm² Min | |
| Elongation | 29-30% | |
| Hardness(Rockwell) | 29/30 | |
| Impact | 100J |
Super Duplex Stainless Steel Specifications
ASTM A790 UNS S32760 Mechanical Properties
| 0.2% Proof Stress | 550 N/mm2 | 79.8 ksi |
| Tensile Strength | 750 N/mm2 | 108.8 ksi |
| Elongation, 5.65√S0 | 25% | |
| Reduction of area | 45% | |
| Hardness (Brinell) | 270 max. | |
| Impact Strength (Room Temp) | 80J | 59 lb.ft |
| Impact Strength (-46oC) | 60J av (45J min) | 44 lb.ft av (33 lb.ft min) |
Notes:
- Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
- Minimum properties quoted (tested at room temperature in a longitudinal direction)
- Testing performed on each melt of material per heat treatment batch
- Hardness shall be in accordance with NACE MR 1075 with a maximum HRC of 2
- ASTM G48A corrosion test (at 50°C) no pitting and < 3.0 g/m2 weight loss (ASTM specification < 4.0 g/m2)
- Ferrite content 35-55%
- Microstructure certified free from grain boundary carbides, sigma, chi and laves phases
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- S32760 Super Duplex Steel Pipe Applications
UNS S32760 is used in the oil and gas industry, on offshore platforms, in heat exchanger, chemical processing equipment, pressure vessels and boilers.
Oil and gas industry equipment,
Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems,
Chemical process industries, heat exchanger, vessels, and piping,
Desalination plants, high pressure RO-plants and seawater piping,
Mechanical and structural components, high strength, corrosion-resistant parts,
Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping. 
