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PRODUCT MATERIAL

STAINLESS STEEL 13-8PHDownload

13-8 stainless is a martensitic precipitation hardening stainless steel that has excellent strength, high hardness, superior toughness and good corrosion resistance. Good transverse toughness properties are achieved by tight chemical composition control, low carbon content, and vacuum melting. Typical applications are large airframe structural components and injection molding equipment.

Chemistry

 

Ni

Cr

Mo

C

P

S

Si

Mn

N

Al

Fe

MIN

7.5

12.25

2.0

-

-

-

-

-

-

0.90

-

MAX

8.5

13.25

2.5

0.05

0.01

0.008

0.1

0.2

0.1

1.35

Balance

Specifications

AMS 5629
ASTM A 564
EN 1.4548
UNS S13800
W. Nr./EN 1.4548
Werkstoff 1.4548

Inventory

13-8 PH Round Bar

Common Trade Names

13-8 Stainless

Features

· Martensitic, precipitation hardening (maraging) stainless steel.

Applications

· Aerospace components

· Injection molding equipment

· Components in the petrochemical and nuclear industries

Physical Properties

Density: 0.279 lb/inch3 
Melting Range: 2560 - 2680°F
Electrical Resistivity: 613 Ohm-circ mil/ft

Temperature, °F

70

212

392

572

Coefficient of Thermal Expansion, in/in°F x 10-6

-

7.2

7.5

7.8

Thermal Conductivity
Btu • ft/ft2 • hr • °F

8.6

9.2

9.8

10.4

Modulus of Elasticity,
psi X 106

29.0

28.1

27.0

26.1

* 70°F to indicated temperature.

Mechanical Properties

Strength varies with heat treatment condition. The following table shows minimum mechanical properties for the various aged conditions, per AMS 5864.

 

H950

H1000

H1025

H1050

H1100

H1150

0.2 Offset Yield Strength, ksi

205

190

175

165

135

90

Ultimate Tensile Strength, ksi

220

205

185

175

150

135

Elongation in 2", %

10

10

11

12

14

14

Reduction of Area, % (Longitudinal)

45

50

50

50

50

50

Reduction of Area, % (Transverse)

45

50

50

50

50

50

Reduction of Area, % (Short-Transverse)

35

40

45

45

50

50

Min Hardness, Rockwell

45

43

-

40

34

30

 

Heat Treament

13-8 Stainless is available in the annealed condition, which is also called the solution heat treat condition or Condition A. Solution treat from 1675 - 1725°F for 15 to 30 minutes at temperature. Air cool or oil quench to below 60°F to effect complete transformation to martensite. Aging is normally carried out from 950 - 1150°F, depending on the desired final properties. Heat treatment is usually performed in air. Heat treatment of brazed components may be done in inert atmospheres. Reducing atmospheres should not be used because of the potential for nitrogen contamination.

Condition

H950

H1000

H1025

H1050

H1100

H1150

Temperature, °F

950±10

1000±10

1025±10

1050±10

1100±10

1150±10

Time, hours

4±0.25

4±0.25

4±0.25

4±0.25

4±0.25

4±0.25