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What Is Stainless Steel AL6XN?

Views: 4     Author: Wang     Publish Time: 2024-06-20      Origin: Site

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Overview

Stainless Steel AL6XN(UNS N08367) is a low carbon, high purity, nitrogen-bearing “super-austenitic” stainless alloy. The Stainless Steel AL6XN was designed to be a seawater resistant material and has since been demonstrated to be resistant to a broadrange of very corrosive environments. The high strength and corrosion resistance of the AL-6XN alloy make it a better choice than the conventional duplex stainless steels and a cost effective alternative to more expensive nickel-base alloys in applications where excellent formability, weldability, strength and corrosion resistance are essential. It is also a cost-effective alternative to less expensive alloys, such as Type 316, that do not have the strength or corrosion resistance required to minimize life cycle costs in certain applications.The high nickel and molybdenum contents provide improved resistance to chloride stress-corrosion cracking.


AL6XN is a super austenitic stainless steel with extraordinary resistance to chloride pitting, crevice corrosion and stress corrosion cracking. AL6XNis a 6 Moly alloy that was produced for and is utilized as a part of highly aggressive environments. It has a high nickel (24%), nitrogen, molybdenum (6.3%) and chromium contents that give it magnificent resistance to chloride stress corrosion cracking, chloride pitting, and unique corrosion resistance. Stainless Steel AL6XN is basically utilized for its enhanced pitting and crevice corrosion resistance in chlorides. It is a weldable and formable stainless steel. Due to its nitrogen content, AL6XN has greater tensile strength than regular austenitic stainless steel, while retaining high flexibility and effective strength.


UNS N08367 is available in a variety of forms, including Pipe, tube, fitting, flange, sheet, strip, plate, round bar, flat bar, fastener, forging stock and wire etc. It ASTM specifications include ASTM B688, ASTM A240,ASTM B675, ASTM A312, ASTM B676, ASTM A249, ASTM B804, ASTM B691, ASTM A479, ASTM B462, ASTM A182, ASTM B564, ASTM B366, ASTM B472,NACE MR-0175.


Chemical properties of al6xn

AL6XN (UNS designation N08367) is a type of weldable stainless steel that consist of an alloy of nickel (24%), chromium (22%) and molybdenum (6.3%) with other trace elements such as nitrogen. The high nickel and molybdenum contents of the AL-6XN alloy give it good resistance to chloride stress-corrosion cracking.

Grade

C

Mn

P

S

Si

Ni

Cr

Fe

N

Cu

Mo

AL6XN

.03 max

2.0 max

.04 max

.03 max

1.0 max

23.5 - 25.5

20.0 -22.0

Bal

.18 - .25

.75 max

6.0 - 7.0


Mechanical properties of AL6XN

Machining

Stainless Steel 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.


Corrosion Resistance

Chromium, molybdenum, nickel and nitrogen all contribute to overall resistance 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.


Welding

All techniques except oxyacetylene welding have been effectively utilized with this alloy. 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.


Forming

This material 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.


Forging

Soak material at 2200-2250 F (1204-1232 C), complete by reheating to 2050-2150 F (1120-1180 C) and cooling rapidly to room temperature.


Cold Working

This material work hardens quickly and requires regular stress relief annealing to effectively be formed. Its ductility and toughness provide for relative ease of fabrication in the field. The formability and weldability are much better compared to that of high alloy ferritic or duplex stainless steels that exhibits comparable corrosion resistance.


Annealing

Soak material altogether at 2050-2150 F (1120-1180 C) followed by water quench. Slow cooling will cause the formation of harmful second phases.


Hardening

This alloy does not give any response to hardening by heat treatment.


In what applications is AL6XN used?

The high content of nickel and molybdenum offers more resistance to corrosion and cracking caused by chloride stress. Copper content has been kept at a residual level for better performance in seawater applications. Moreover, the composition of high allow in the AL-6XN alloy tubing protects from crevice corrosion and pitting corrosion. Following are some of the major applications of AL6XN alloy :

Water piping systems for nuclear power plants

Process systems for offshore gas and oil platforms

Chemical process pipelines and tanks

Heat exchanger, condenser, piping for crude oil or seawater storage

Vats, press oils, filter washed in pulp bleaching plants

Tall oil distillation packing

Transformer cases that are exposed to marine water

Food processing equipment

Pharmaceutical equipment

Power plant fuel as a scrubber

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
Tel: +86 19339900211
Add: Stainless steel Market 289, Xinwu District , Wuxi, China
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