| Zeon Grade | Alloy Name | UNS | EN / DIN / W Nr. | AISI / ASTM | Trademarks |
|---|---|---|---|---|---|
| Zeon55 | Alloy 2507 | UNS S32760 | 1.4501 | F55 | Zeon100 |
| Elements | Min | Max |
|---|---|---|
| Cr | 24.00 | 26.00 |
| Ni | 6.00 | 8.00 |
| Mo | 3.00 | 4.00 |
| W | 0.50 | 1.00 |
| Cu | 0.50 | 1.00 |
| Mn | - | 1.00 |
| N | 0.20 | 0.30 |
| Si | 0.10 | 0.80 |
| P | - | 0.025 |
| S | - | 0.005 |
| Fe | - | Bal |
| Density (Kg/m3) | 7810 |
| Magnetic Permeability (20°C) | 33 |
| Young’s Modulus (kN/mm2) | 199 |
| Specific Electrical Resistance, 20°C (Ω-m) | 0.80 |
| Mean coefficient of thermal expansion, 20-100°C (m/m/degC) | 11.1 x 10-6 |
| Specific Heat, 20°C (J/kg.K) | 475 |
| Thermal conductivity, 20°C (W/m.K) | 14.2 |
| Fracture Toughness, kQ (MPa/m2) | 98 |
| 0.2% Proof Stress | 550 N/mm2 | 79.8 ksi |
| Tensile Strength | 750 N/mm2 | 108.8 ksi |
| Elongation, 5.65√S0 and 4D | 25% | - |
| Reduction of Area | 45% | - |
| Hardness (Brinell) | <270 | - |
| Impact Strength (Room Temp) | 80J | 59 lb.ft |
| Impact Strength (-46degC) | 60J av (45J min) | 44 lb.ft av (33 lb.ft min) |
| Corrosion Resistance Properties of Alloy 255 |
|---|
| UNS S32760 is a super duplex stainless steel grade with a pitting resistance equivalent (PRE) number of more than 40, and provides excellent corrosion resistance and strength properties. High impact strength at sub-zero temperatures, UNS S32760 displays excellent corrosion resistance.Suitable for use in harsh environments UNS S32760 is a cost effective super duplex stainless steel. |
| Workability | The high-temperature strength of NAS 75N is basically the same as Type 430 in the range of 950~1150°C. It should be noted that the strength increases abruptly below 900°C. Solution annealing should be done after hot working. Regarding cold workability, care is required as proof stress is high and elongation is low in comparison with Type 304. |
|---|---|
| Weldability | Various welding methods are applicable in the same manner as with the standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. Use of welding electrodes for UNS S32760 is recommended. Preheating and postheating are not necessary. In welding, the interpass temperature should be no more than 100°C in order to prevent formation of intermetallic compounds. |
| Heat Treatment | Solution annealing of NAS 75N should be performed at 1100°C and higher followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M) |
| Pickling | A mixture of nitric acid and fluoric acid is used in pickling. However, because descaling is somewhat difficult in comparison with Type 304, alkali immersion before acid pickling, and if possible, shot blasting are extremely effective. |
| Applications Of Alloy 255 | ||
|---|---|---|
| Oil & Gas industry pumps, valves, wellhead and subsea equipment | Pollution control scrubbers, precipitators, fans and pumps | Marine propellers, shafts, rudders, seals, pumps, valves |
| Bolts and fasteners | Process industry equipment in sulphuric acid, nitric acid, phosphoric acid, PP / PVC/TiOx production, agrochemicals | Grain and vegetable processing plant, sugar cane centrifuges |
| Pulp and paper digester blow vales, feed valves, washers, black liquor heater tubes, bleaching components | Copper smelting fans, tuyere bars, wet scrubbers, leaching area precipitators | Water and sewage treatment, desalination, swimming pools |