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ALLOY 17-7 PH COMPOSITION

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Stainless Steel 17-7

Related Metals:

17-7 PH(tm)
AL 17-7(tm)
9RU10(tm)                                    

Specifications:

AISI 631
AMS 5528
AMS 5529
AMS 5568
AMS 5644
AMS 5678
ASTM A313 (631)
ASTM A564 (631)
ASTM A579 (631)
ASTM A693 (631)
ASTM A705 (631)
DIN 1.4568
MIL S-25043
UNS S17700

Chemistry Data

Aluminum

0.75 - 1.5

Carbon

0.09 max

Chromium

16 - 18

Iron

Balance

Manganese

1 max

Nickel

6.5 - 7.75

Phosphorus

0.04 max

Silicon

1 max

Sulphur

0.04 max

General Information

Principal Design Features

A precipitation hardenable chromium-nickel-aluminum stainless steel combining high strength, moderate corrosion resistance and properties well suited for flat springs.


Applications

Used for applications requiring good strength, corrosion resistance and mechanical properties up to 800 F in service. It is often used for very detailed, intricate parts due to its low distortion in heat treatment. Very stable. Commonly found in a variety


Machinability

Rated at 75 % of B1112. This alloy displays long gummy chips that require chip breakers to overcome. Slow speeds and constant feeds are recommended for best results.


Forming

Forming characteristics of this alloy are similar to 301 stainless steel. Intermediate annealing may be necessary for radical forming operations.


Corrosion Resistance

Not suitable for use in marine applications. Resistant to a wide variety of dilute acids, fresh water and atmosphere. Superior to standard heat treatable chromium stainless steels, it approaches 301 and 302 stainless corrosion resistance. Resistant to liq


Welding

Most common arc and resistance methods have been successfully employed with 17-7 PH. It is recommended that inert gas shielding be employed during fusion welding to reduce the oxidation of aluminum during the process. Pre-heating and post-weld annealing a


Heat Treatment

CONDITION C - Results from heavy cold working (generally 45-50% reduction) 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 mater


Cold Working

In Condition A, this material can be easily formed using most common procedures.


Annealing

1950 F (1066 C) for 3 minutes for each .1 inch (2.5 mm) of thickness, air cool.


Aging

Solution anneal at 2150 F for 4 hours and air cool. Follow with 1975 F for 4 hours and air cool, then 1550 F for 24 hours, air cool and 1400 F for 16 hours, air cool to complete precipitation hardening process. Resistant to liquid oxygen and hydrogen an


Physical Data

Density (lb / cu. in.)

0.282

Specific Gravity

7.81

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

0.11

Mechanical Data

Form

Sheet

Condition

A 1750

Temper

70

Tensile Strength

132

Yield Strength

40

Elongation

20

Rockwell

B85


Form

Sheet

Condition

Annealed

Temper

70

Tensile Strength

130

Yield Strength

45

Elongation

30

Rockwell

B85


Form

Sheet

Condition

C

Temper

70

Tensile Strength

219

Yield Strength

191

Elongation

5

Rockwell

C43


Form

Sheet

Condition

CH 900

Temper

70

Tensile Strength

265

Yield Strength

259

Elongation

3

Rockwell

C49


Form

Sheet

Condition

R 100

Temper

70

Tensile Strength

174

Yield Strength

115

Elongation

10

Rockwell

C37


Form

Sheet

Condition

RH 950

Temper

70

Tensile Strength

220

Yield Strength

200

Elongation

9

Rockwell

C46


Form

Sheet

Condition

T

Temper

70

Tensile Strength

145

Yield Strength

99

Elongation

10

Rockwell

C31


Form

Sheet

Condition

TH 1050

Temper

70

Tensile Strength

190

Yield Strength

160

Elongation

10

Rockwell

C42

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