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Views: 1 Author: Wang Publish Time: 2024-09-20 Origin: Site
AL6XN alloy (UNS N08367) is a low carbon, high purity, nitrogen-bearing “super-austenitic” stainless alloy. The AL-6XN alloy was designed to be a seawater resistant material and has since been demonstrated to be resistant to a broad range of very corrosive environments. The high strength and corrosion resistance of the AL6XN alloy make it a better choice than the conventional duplex stainless steels and a cost effective alternative to more expensive nickel-base alloys where excellent formability, weldability, strength and corrosion resistance are essential.
AL6XN is a superaustenitic stainless steel with outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking. AL6XN is a 6 moly alloy that was developed for and is used in highly aggressive environments. It has high nickel (24%), molybdenum (6.3%), nitrogen and chromium contents that give it excellent resistance to chloride stress corrosion cracking, chloride pitting, and exceptional general corrosion resistance. AL6XN is primarily used for its improved pitting and crevice corrosion resistance in chlorides. It is a formable and weldable stainless steel. Because of its nitrogen content, AL6XN has greater tensile strength than common austentitic stainlesses, while retaining high ductility and impact strength.
The levels of chromium, molybdenum and nitrogen in AL6XN all serve to provide resistance to acidic oxidizing chloride solutions previously achieved only by the nickel base alloys. High nickel (24%) and molybdenum (6.3%) contents make AL6XN a solution to chloride ion stress corrosion cracking. Because of its nitrogen content, AL6XN has greater tensile strength than common austenitic stainless, while retaining high ductility and impact strength. The ASME allowable stresses for AL6XN are up to 75% higher than for 316L stainless, and more than twice those for the copper-nickel alloys.
AL6XN (UNS N08367) provides a stable and reliable value that enables the owner to establish an accurate return on investment. Decreases in unplanned downtime, product loss, and maintenance costs with AL6XN contribute to this value.
Alloy | Cr | Ni | Mo | C | N | Mn | Si | P | S | Cu | Fe |
AL6XN | 20.00-22.00 | 25.50 | 6.00-7.00 | 0.03 | 0.18-0.25 | 2.00 | 1.00 | 0.04 | 0.03 | 0.75 | Balance |
AL6XN is quite ductile in the annealed condition, but it works hardens more quickly and requires more power to cut than do the plain carbon steels. Chips are stringy as well as tough. Approximate speeds for turning and milling are 70 sfm, and for drilling 50 sfm. Machine tools are not flexible and used to no more than 75% of their rated capacity. Both workpiece as well as tools is not flexible; tool overhang should be minimized. Tools, fast speed steel or cemented carbide, should be sharp, and reground at predetermined intervals. Turning operations require chip curlers or breakers. The feed rate should be sufficient to ensure that the tool cutting edge is getting under the previous cut in this way staying away from work-hardened areas. This is vital. With heavy cuts slow speeds are usually required. Lubricants for example, sulfur-chlorinated petroleum oil, are recommended. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not expeditiously on the workpiece as this will work harden the material and result in early tool dulling or breakage. All traces of cutting fluid must be separate from prior to welding, annealing, or utilized in corrosive service.
All techniques except oxyacetylene welding have been effectively utilized with alloy AL6XN. While a filler metal of type 316 stainless may be adequate for some applications, it is preferable to employ a higher alloy for example 625, or C-276 for maximum performance.
The AL6XN can be formed by utilizing every common technique, however, because of its high strength; higher forces will be required to deform it. Tubes can be bent to a minimum radius slightly less than 1.5 times the tube diameter. Material should be either stress or completely annealed after forming to re-accomplish maximum corrosion and mechanical properties.
Soak AL6XN at 2200-2250 F (1204-1232 C), complete by reheating to 2050-2150 F (1120-1180 C) and cooling rapidly to room temperature.
AL6XN work hardens quickly and requires regular stress relief annealing to effectively be formed.
Soak AL6XN altogether at 2050-2150 F (1120-1180 C) followed by water quench. Slow cooling will cause the formation of harmful second phases.
AL6XN does not give any response to hardening by heat treatment.
Product | Specification | |
UNS N08367 | ASME | ASTM |
Plate, Sheet & Strip | SA-240, SB-688 | A240, B688 |
Rod, Bar & Wire | SB-691 | B691 |
Welded Pipe | SB-675 | B675 |
Welded Tube (General Applications) | SB-676 | B676, A269 |
Seamless Pipe & Tube | SB-690 | B690 |
Forged Flanges, Fittings & Valves | SB-462 | B462 |
Butt Weld Pipe Fittings | SB-366, SA-403 | B366, A403 |
Forgings | SB-564, SA-182 | B564, A182 |
Reverse osmosis desalination equipment and pumps
FGD Scrubbers
Chemical process tanks and pipelines
Seawater heat exchangers
Tall oil distillation columns and packing
Offshore oil and gas production equipment
Pulp bleaching plant washers, vats, press rolls and pipelines
