• AL6XN Flat Head Screws

AL6XN Flat Head Screws

Brand RAYCHIN

Product origin China

Delivery time 5-35 DAYS

Originally developed to combat sea water corrosion, AL6XN has expanded its role as being good mid-range corrosion resistant alloy. AL6XN flat head screws are a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. Also considered a 6Moly alloy, AL6XN screws are similar in chemistry 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.

AL6XN Flat Head Screws

AL6XN Flat Head Screws

Originally developed to combat sea water corrosion, AL6XN has expanded its role as being good mid-range corrosion resistant alloy. AL6XN flat head screws are a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. Also considered a 6Moly alloy, AL6XN screws are similar in chemistry 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

· Flat head screw features and benefits

· AL6XN Datasheet


Corrosion Resistance
•  Moderate general corrosion resistance
•  Excellent chloride / salt water protection
•  Good performance in phosphoric acid
•  Moderate resistance to nitric acid

图片3.png 

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, flat head screws 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 flat head screws outperform so many alloys providing protection to stress corrosion cracking, pitting and crevice corrosion in a broad range of marine applications. AL6XN flat 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

图片4.png 

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 flat head screws good high strength properties

AL6XN Applications
•  Desalination plants depend on AL6XN flat head screws for the salt water corrosion protection
•  Pulp bleaching equipment and piping 
•  The power industry uses AL6XN flat 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 Screw Types: 12 Point ScrewsButton Head Cap ScrewsFlat Head ScrewsHex Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap ScrewsTamper Resistant Security ScrewsTorx Screws



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 at

0.2% 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




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