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PRODUCT MATERIAL

STAINLESS STEEL AL-6XN®Download

 UNS N08367
ASTM B 688, B 691, B 675 / 676
B 462, B 366, B 564, B 804

Forms of AL-6XN Available
• Sheet
• Plate
• Bar
• Pipe & Tube (welded & seamless)
• Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
AL6XN Overview
AL6XN is a superaustenitic stainless steel with outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking. AL6XN is a 6 moly alloythat 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.

Corrosion Resistance
Chromium, molybdenum, nickel and nitrogen all contribute to overallresistance to corrosion by various media. Chromium is the principal agent for conferring corrosion resistance in neutral or oxidizing environments. Chromium, molybdenum and nitrogen increase resistance to pitting corrosion. Nickel imparts the austenitic structure. Nickel and molybdenum both provide increased resistance to chloride stress corrosion cracking in reducing environments.
What are the characteristics of AL-6XN?
• Excellent resistance to pitting and crevice corrosion in chloride solutions
• Practical immunity to stress corrosion in NaCl environments
• High Strength and toughness
Chemical Composition, %

Ni

Cr

Mo

C

N

Mn

23.5-25.5

20.00-22.00

6.00-7.00

0.03 Max

0.18-0.25

2.0 Max

Si

P

S

Cu

Fe

 

1.00 Max

.040 Max

0.03 Max

0.75 Max

Remainder

 

In what applications is AL-6XN used?
• 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
ASTM Specifications

Pipe Welded

Tube Welded

Sheet/Plate

Bar

Flanges & Fittings

B675, A312

B676, A249

B688, A240

B691, A479

B462, A182

Mechanical Properties
Representative Tensile and Impact Properties, Plate

Temp. ° F (° C)

Ult. Tensile Strength, psi

.2% Yield Strength, psi

Elongation in 2”? percent

Charpy V-Notch Toughness, ft-lb

-450 (-268)

218,000

142,000

36

353*

-320 (-196)

196,000

107,000

49

85

-200 (-129)

-

-

-

100

70 (21)

108,000

53,000

47

140

200 (93)

99,900

49,400

47

-

400 (204)

903,000

40,400

46

-

600 (316)

86,000

36,300

47

-

800 (427)

87,000

36,000

48

-

*For welded pipe and tube, a joint efficiency factor of .85 must be applied.
* AL-6XN® is a registered trademark of the Allegheny Ludlum Corporation