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INCOLOY® alloy 25-6HN (UNS N08367)
Ni 25, Cr 20, Mo 6, Cu 0.25, N 0.2

High Performance Alloys stocks and produces this grade in the following forms: Bar, billet, sheet fasteners and forgings. Request quote on this grade in sheets 0.062, 0.074 and 0.125" thick.

Overview

INCOLOY alloy 25-6HN is a 6% molybdenum super-austenitic stainless steel. It offers an excellent combination of strength, ductility and resistance to corrosion by a variety of media at an economical price. It is readily formed and welded. The properties of the alloy are enhanced by its content of nitrogen. Its high content of nickel results in thermal stability and resistance to stress corrosion cracking. Designated as UNS N08367, alloy 25-6HN directly competes with Allegheny Ludlum alloy AL6XN®. The alloys are covered by the same ASTM, ASME, and NACE specifications. Applications are found in the air pollution control, power, chemical processing, marine, pulp and paper, and oil and gas industries. Alloy 25-6HN is a new addition to Special Metals existing line of high performance, super-austenitic stainless steels, INCOLOY alloys 25-6MO and 27-7MO.

Characteristics

  • PREN 48.3 Typical for ASTM G48, CPT per G48-C 75C, CCT per G48-D 35C
  • Density 0.290 Lbs/cubic inch
  • Magnetic permeability 1.003 (200 Oersteds at Room Temp)
  • Coefficient of thermal expansion (68-212F) 8.49x10 in/in Deg F
  • Higher strength than conventional austenitic grades (304/316)

Applications

  • Marine enviroments
  • Desalination systems
  • Flue gas desulfurization equipment
  • Reaction vessels for pharmaceutical production

 

Chemistry

Chemical Requirements

Ni

C

Mn

Cr

N

Si

Mo

Fe

Max

25.5

.03

2.0

22.0

0.25

1.0

7.0

Bal

Min

23.5

20.0

0.18

6.0

Tensile Data

Mechanical Property Requirements

Ultimate Tensile

Yield Strength (0.2% OS)

Elong. in 2 in. or 50mm or 4D, min., %

R/A

Hardness

Annealed

Typical

107 KSi

55 KSi

48

Rb 90

D- Forging quality is furnished to chemical requirements and surface inspection only. No mechanical properties required.

Specifications

Form

Standard

Metal Type

UNS N08367

Bar

ASTM B691 / ASME SB691

Wire

ASTM B691 / ASME SB691

Sheet

ASTM B688, A240 / ASME SB688 SA240

Plate

ASTM B688, A240 / ASME SB688 SA240

Tube

ASTM B676 WELDED

Pipe

ASTM B675 WELDED

Fitting

ASTM B366 / ASME SB366 / ASTM B462 / ASME SB462

Forging

ASTM B472 / ASTM B462 / ASME SB462

Weld Wire

622, 686 or 625

Weld Electrode

Inconel 112, 122 or INCOWELD 686CPT

Din

 

 

Machining

Machinability Ratings

MACHINING DATA
Carbide tools are suggested
for rates better than 50% of Type 304.
Machining Type Suggested starting rates are:
Single Point turning : Roughing - 0.15" depth, 0.018"/rev feed -200 SFM
Finishing - 0.025" depth, 0.007"/rev feed - 350 SFM
Drilling : 1/4" Dia hole - 0.004"/rev feed - 60 SFM
1/2" Dia hole - 0.007"/rev feed - 60 SFM
3/4" Dia hole - 0.010"/rev feed - 60 SFM
Reaming : Feed - same as drilling - 100 SFM
Side and Slot Milling : Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM
Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM
These rates are for carbide tools,
Type C-2 for roughing, drilling and reaming.
Type C-3 for finishing.

 

INCOLOY® is a registered trademark of Special Metals.

 
 
   
 
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