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PRODUCT MATERIAL

STAINLESS STEEL 17-4Download

17-4 stainless is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel. Hardening is achieved by a short-time, simple low-temperature treatment. Unlike conventional martensitic stainless steels, such as type 410, 17-4 is quite weldable. The strength, corrosion resistance and simplified fabrication can make 17-4 stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades. 

At the solution treating temperature, 1900°F, the metal is austenitic but undergoes transformation to a low-carbon martensitic structure during cooling to room temperature. This transformation is not complete until the temperature drops to 90°F. Subsequent heating to temperatures of 900-1150°F for one to four hours precipitation strengthens the alloy. This hardening treatment also tempers the martensitic structure, increasing ductility and toughness. 

We stocks 17-4 in condition "A", and also stocks material in the hardened condition H1150.

Chemistry

 

Ni

Cr

Mo

Mn

Cu

Si

C

Cb+Ta

S

P

Fe

MIN

3.0

15.0

-

-

3.0

-

-

5 x C

-

-

-

MAX

5.0

17.5

0.50

1.0

5.0

1.0

0.07

0.45

0.03*

0.04*

Balance

*0.025 max

Specifications

AMS 5604AMS 5643AMS 5825
ASME SA 564ASME SA 693ASME SA 705ASME Type 630
ASTM A 564ASTM A 693ASTM A 705ASTM Type 630
EN 1.4548
ISO 15156-3
NACE MR0175S17400
UNS S17400
W. Nr./EN 1.4548
Werkstoff 1.4548

Inventory

17-4 Plate, 17-4 Round Bar, 17-4 Weld Wire

Common Trade Names

17-4 Stainless

Features

· High tensile strength and hardness to 600°F

· Corrosion resistant

· Excellent oxidation resistance to about 1100°F

· Creep-rupture strength to 900°F

Applications

· Gate valves

· Chemical processing equipment

· Pump shafts, gears, plungers

· Valve stems, balls, bushings, seats

· Fasteners


Physical Properties

Density: 0.282 lb/inch3 
Melting Range: 2560 - 2625°F
Poisson's Ratio: 0.272
Electrical Resistivity: 463 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

Representative Tensile Properties, Longitudinal Direction

 

H900*

H925

H1025

H1075

H1100

H1150

HH1150

H1150-M

Ultimate Tensile Strength, ksi

200

190

170

165

150

145

140

125

0.2% Yield Strength, ksi

185

175

165

150

135

125

120

85

Elongation % in 2" or 4XD

14

14

15

16

17

19

22

22

Reduction of Area, %

50

54

56

58

58

60

65

68

Hardness, Brinell (Rockwell)

420 (C 44)

409 (C42)

352 (C 38)

341 (C 36)

332 (C 35)

311 (C 33)

294 (C 31)

277 (C 27)

Impact Charpy V-Notch, ft - lbs

15

25

35

40

45

50

55

100

*For applications requiring greater impact toughness, aging for 4 hours develops typical properties UTS - 196 ksi, 0.2% YS - 181 ksi, Elongation in 2" - 14%, Reduction of Area - 52%, Hardness - Rockwell C 43, and Charpy V-notch impact - 20 foot-pounds

Heat Treament

Designation

Processing

Condition A**

Heated at 1900°F±25°F for 1/2 hour, air (Solution Treated) cooled or oil quenched to below 90°F. Normally performed at mill.

H900

Condition A material heated at 900°F±15°F for 1 hour and air cooled. Maximum hardness but low toughness. Sensitive to stress corrosion cracking. Heating 4 hours improves toughness with about 4 ksi reduction in tensile and yield.

H925, H1025, H1075,
H1100, H1150

Condition A material heated 4 hours at specific temperature, and air cooled.

H1150

Condition A material heated 4 hours at 1150F, air cooled, heated again for an additional 4 hours at 1150F and air cooled.

H1150-M

Condition A material heated at 1400°F±25°F for 2 hours, air cooled, then heated at 1150°F±15°F for 4 hours and air cooled.

**For most applications, 17-4 stainless should not be used in Condition A. This is true even though the desired tensile strength may be provided by that condition. While the alloy is relatively soft in condition A, the structure is untempered martensite that has low fracture toughness and ductility, while poor resistance to stress-corrosion cracking. Superior service performance is assured by using 17-4 stainless in the heat-treated condition.