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ALLOY 15-7 PH COMPOSITION

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Stainless Steel 15-7

Related Metals:

AL 15-7(tm)
Armco PH 15-7 Mo(tm)
Armco15-7 Mo(tm)                                    

Specifications:

AMS 5520
AMS 5657
ASTM A564 (632)
ASTM A579 (632)
ASTM A693 (632)
ASTM A705 (632)
DIN 1.4532
DIN 1.4574
MIL S-8955
UNS S15700

Chemistry Data

Aluminum

0.75 - 1.5

Carbon

0.09 max

Chromium

14 - 16

Iron

Balance

Manganese

1 max

Molybdenum

2 - 3

Nickel

6.5 - 7.75

Phosphorus

0.04 max

Silicon

1 max

Sulphur

0.03 max

General Information

Principal Design Features

This alloy is a semi-austenitic precipitation hardening stainless steel. It combines moderate corrosion resistance with high strength and hardness at operating temperatures up to 900 F.


Applications

Retaining rings, springs, diaphragms, aircraft bulkheads, welded and brazed honeycomb panels and other uses requiring high strength at elevated temperatures.


Machinability

Tough and gummy, this alloy responds best to machining in the hardened conditions. Chip breakers are suggested.


Corrosion Resistance

Like many of the precipitation hardening grades, 15-7 will display rust in marine environments. It is best suited to exposure to dilute acids and alkalis, fresh water and atmosphere. For optimum performance, material must be clean and free of scale and im


Welding

Readily welded by most of the common arc and resistance methods. Preheating and post weld annealing is not required in this alloy. Avoid inert gas shielding to prevent oxidation of aluminum.


Heat Treatment

CONDITION C - Results from heavy cold working of solution treated material. CONDITION CH900- Heat Condition C material to 900 F(482 C), hold for 1 hour, air cool. CONDITION A1750- After fabrication heat solution treated material to 1750 F(955 C), hold for


Hot Working

This alloy works well in all common hot working procedures. Material should be annealed after hot working for best heat treat response.


Cold Working

Cold work is restricted only by this alloys high initial yield strength. The alloy is not favored for cold working but can be moderately formed.


Annealing

1900 F (1038 C) for 1 hour, rapid cooling. Also known as " solution treating."


Physical Data

Density (lb / cu. in.)

0.282

Specific Gravity

7.804

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.11

Mechanical Data

MSO currently has no data available for this grade.

 

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