AL6XN Pan Head Screws
Originally developed to combat sea water corrosion, AL6XN has expanded its role as being good mid-range corrosion resistant alloy. AL6XN Pan Head Screws are a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. Also considered a 6-Moly alloy (6% Molybdenum), AL6XN Pan Head Screws are similar in composition and capabilities to Alloy 926 and SMO 254. With a higher nickel and molybdenum content than Duplex 2205 and Super Duplex 2507, it delivers better corrosion resistance while giving a more cost effective alternative to nickel super alloys like Inconel or Hastelloy in moderately corrosive conditions.
A mid-ranged corrosion resistant 6Mo alloy with good strength
Good corrosion resistance to moderate acids & sea-water
50% stronger than stainless steel
Usable temperature limit of 1000°F
AL6XN Chemistry & Specifications
AL6XN Datasheet
Corrosion Resistance
Moderate general corrosion resistance
Excellent chloride / salt water protection
Good performance in phosphoric acid
Moderate resistance to nitric acid
Chemical Resistance
In chemical processes which utilize chlorides, such as paper mills and waste water, stress corrosion cracking (SCC) is a common culprit for 316L stainless failures. Duplex alloys will outlast environments that will cause SCC in 316 stainless, but for more severe low PH environments, fasteners made from higher nickel content alloys like AL6XN will generally work better. For the most extreme situations, alloys with >45% nickel content like Hastelloy are often considered.
Outstanding Resistance to Salt Water
Seawater is where AL6XN outperforms so many alloys providing protection to stress corrosion cracking, pitting and crevice corrosion in a broad range of marine applications. AL6XN Pan Head Screws contain a minimum of 6%molybdenum content and it is this addition of molybdenum that provides the greatest protection against pitting and crevice corrosion.
Mechanical Properties
Electrical Resistivity: 535 Ohm-circ mil/ft
Ultimate Tensile Strength: 108 ksi
0.2% Yield Strength: 53 ksi
Density: 0.291 lb/in 3
Chemistry
• High molybdenum content provides enhanced corrosion protection in chloride environments.
• Carbon helps to prevent sensitization during welding
• Chromium enhances pitting and crevice corrosion resistance
• The interstitial strengthening effect of nitrogen gives AL6XN good high strength properties
AL6XN Applications
• Desalination plants depend on AL6XN for the salt water corrosion protection
• Pulp bleaching equipment and piping
• The power industry uses AL6XN Pan Head Screws where salt water and chlorides are present such as steam surface condensers, supercritical, high pressure, feed water heaters, steam surface condensers, flue-gas desulfurization equipment and in nuclear power water piping
• Offshore
• Chemical Processing - processing tanks, vessels and pipes as well as plate and frame heat exchangers.
AL6XN Fastener Types: Bolts, Nuts, Screws, Studs, Threaded Rods, Washers
Custom Availability
Diameter sizes: Standard #00 – 4” in diameter / Metric M1.2 – M100
Threads: UNC, UNF, UNJ, UNR, Rolled,Cut
Minimum Volume – Typically 10pcs, depending on size and stock
Custom to print
AL6XN Fastener Types
| AL6XN Screws | 12 Point Screws Button Head Cap Screws Flat Head Screws Hex Head Cap Screws Pan Head Screws Security Screws Set Screws Socket Head Cap Screws Vented Screws | • DIN 603 / ISO 8677 • DIN 912 / ISO 4762 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029 • DIN 921 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676 • DIN 965 / ISO 7046 • DIN 966 / ISO 7047 • DIN 7991 / ISO 10642 • DIN 7380 / ISO 7380 • DIN 84 / ISO 1207 • DIN 85 / ISO 1580 • DIN 34822 • DIN 34821 • DIN 7504 / ISO 15480 • DIN 7984 • DIN 963 / ISO 2009 |
| AL6XN Bolts | Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts | • DIN 931
• DIN 933
• ISO 4014
• ISO 4017
• ISO 7370 |
| AL6XN Nuts | Hex Nuts Lock Nuts | • DIN 439 / ISO 4035
• DIN 934 / ISO 4032
• DIN 985 / ISO 7040
• DIN 986
• DIN 980 / ISO 7042 / ISO 19513
• DIN 6923 / ISO 4161 |
| AL6XN Studs/Rod | Studs Threaded Rod Weld Studs | • DIN 975
• DIN 976 |
| AL6XN Washers | Flat Washers Lock Washer | • DIN 125 / ISO 7089 / ISO 7090
• DIN 126 / ISO 7091
• DIN 127 / ISO 7090
• DIN 9021 / ISO 7093 |
| AL6XN Hose Clamps | Medium Duty Hose Clamps |
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AL6XN Screws
12 Point Screws | AL6XN 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes. | • IFI-115
• MIL SPEC
• DIN 34822
• DIN 34821 |
Button Head Cap Screws | AL6XN button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore. | • ASME B18.3
• ASME 18.3.4M
• DIN 7380 / ISO 7380 |
Flat Head Screws | AL6XN flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface. Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in AL6XN flat head screws can be made require special manufacturing. | • ASME B18.3
• ASME B18.3.6
• DIN 963 / ISO 2009
• DIN 965 / ISO 7046
• DIN 7991 / ISO 10642 |
Hex Head Cap Screws | AL6XN hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes. | • ASME B18.6.3
• DIN 931 / ISO 4014
• DIN 933 / ISO 4017
• DIN 961 / ISO 8676 |
Pan Head Screws | AL6XN pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications. | • ASME B18.6.3
• DIN 7985
• DIN 921
• DIN 85 / ISO 1580
• DIN 84 / ISO 1207
(cheese head)
• DIN 966 / ISO 7047
(raised counter sunk) |
Security Screws | Unique driver designs offer these AL6XN screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. AL6XN security screws are available in several different drive styles, as well as custom per print. |
|
Set Screws | AL6XN set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end. | • ASME B18.3
• DIN 913 / ISO 4026
• DIN 914 / ISO 4027
• DIN 915 / ISO 4028
• DIN 916 / ISO 4029 |
Socket Head Cap Screws | AL6XN socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution. | • ASMET B18.3
• DIN 912 / ISO 4762
• DIN 7984 |
Vented Screws | AL6XN vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. AL6XN vented screws are available in any style. |
|
AL6XN Bolts
Hex Head Bolts | AL6XN hex bolts are similar to hex head cap screws but without the added washer face. They are ideal for high clamping force applications with ease access. | • ASME B18.2.1
• DIN 931 / ISO 4014
• DIN 933 / ISO 4017 |
Shoulder Bolts | AL6XN shoulder bolts are made up of a head, shoulder and threaded segment. The smooth shoulder section allows for rotating parts. Typically available with socket drivers. | • ASME
• DIN 7379 / ISO 7379
• ISO 7370 |
Wedge Anchor Bolts | AL6XN wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments. |
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AL6XN Nuts
Hex Nuts | AL6XN hex nuts are available in a variety of styles including finished hex nuts, jam nuts and heavy hex nuts. | • ASME B18.16.3
• ASME B18.2.2
• DIN 439 / ISO 4035
• DIN 934 / ISO 4032
• DIN 986 |
Lock Nuts | AL6XN lock nuts are available in all metal and polymer insert styles. All-metal lock provide even load distribution and can be used at high temperatures. Polymer insert styles are more economical and are best for temperatures under than 350°F. | • ASME B18.16.3M
• DIN 980 / ISO 7042 /
ISO 19513
• DIN 6923 / ISO 4161
• DIN 985 / ISO 10511 /
ISO 7040 |
AL6XN Studs & Threaded Rod
Studs | AL6XN studs are fully threaded or partially threaded and made to custom lengths. | • ASME B18.31.2
• DIN 976 |
 Threaded Rod | AL6XN threaded rod or all thread are available in lengths greater than 1 foot. Minimum order quantity is a total of 6 feet of length. | • ASME B1.1
• DIN 975 |
Weld Studs | AL6XN weld studs are available in both arc or capacitor discharge (CD) styles. Weld studs provide an extremely secure fastening solution when one side of the stud needs to be permanently fix to a part and the other side with the threads accessible. |
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AL6XN Washers
Flat Washers | AL6XN washers are most commonly offered in SAE sizes, but also availabe in USS, oversized and custom sizes upon request. | • ASME 18.21.1
• SAE / USS
• DIN 125 / ISO 7089 /
ISO 7090
• DIN 126 / ISO 7091 |
Lock Washers | AL6XN lock washers are offered as split lock washers. Belleville spring lock washers can also be made upon request. | • ASME B18.21.1
• DIN 127 / ISO 7090
• DIN 6796 / ISO 10690
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AL6XN Chemical Composition & Specifications
AL6XN Specifications: UNS NO8367, ASTM A 240, ASTM B 688, ASME SA-240, ASME SB-688, ASTM B690, ASTM B691, ASTM A240, ASTM B688, ASME SA-240, ASME SB-688
| AL6XN | Fe | Ni | Cr | Mo | Mn | Si | Cu | N | P | C | S |
| Min % | - | 23.5 | 20.0 | 6.0 | - | - | - | 0.18 | - | - | - |
| Max % | Bal | 25.5 | 22.0 | 7.0 | 2.0 | 1.0 | 0.75 | 0.25 | 0.040 | 0.03 | 0.030 |
AL6XN Mechanical Data
| Temperature (°F) | Ultimate Tensile (ksi) | Yield Strength at0.2% Offset (ksi) | Elongation % |
| -450 | 218 | 142 | 36 |
| -320 | 196 | 107 | 49 |
| Room Temp. | 108 | 53 | 47 |
| 200 | 100 | 49 | 47 |
| 400 | 90 | 40 | 46 |
| 600 | 86 | 36 | 47 |
| 800 | 87 | 36 | 48 |
| 1000 | 84 | 34 | 50 |
Corrosion Curves for AL6XN
| Media | TYPE 316L | TYPE 317L | ALLOY 904L | AL-6XN | ALLOY 276 |
| 20% Acetic Acid | 0.12 | 0.48 | 0.59 | 0.12 | 0.48 |
| -0.003 | -0.01 | -0.02 | -0.003 | -0.01 |
| 45% Formic Acid | 23.41 | 18.37 | 7.68 | 2.40 | 2.76 |
| -0.6 | -0.47 | -0.2 | -0.06 | -0.07 |
| 10% Oxalic Acid | 44.9 | 48.03 | 27.13 | 7.32 | 11.24 |
| -1.23 | -1.14 | -0.69 | -0.19 | -0.28 |
| 20% Phosphoric Acid | 0.60 | 0.72 | 0.47 | 0.24 | 0.36 |
| -0.02 | -0.02 | -0.01 | -0.006 | -0.009 |
| 10% Sodium Bisulfate | 71.57 | 55.76 | 8.88 | 4.56 | 2.64 |
| -1.82 | -1.42 | -0.23 | -0.12 | -0.067 |
| 50% Sodium Hydroxide | 77.69 | 32.78 | 9.61 | 11.4 | 17.77 |
| -1.92 | -0.83 | -0.24 | -0.29 | -0.45 |
| 10% Sulfamic Acid | 124.3 | 93.26 | 9.13 | 9.36 | 2.64 |
| -3.16 | -2.39 | -0.23 | -0.24 | -0.067 |
| 10% Sulfuric Acid | 635.7 | 298.3 | 100.8 | 71.9 | 13.93 |
| -16.15 | -7.58 | -2.53 | -1.83 | -0.35 |
