17-4PH VAR AMS 5622

17-4 PH VAR (AMS 5622) Stainless Steel is a precipitation hardening martensitic stainless steel. Typical use is seen in applications requiring high strength and a modest level of corrosion resistance. Strength and toughness desired can be manipulated by a temperate range in the heat treatment process. Standard specification is AMS 5622 and AMS 5643.

Common stock sizes: .7875” to 9” diameters.

Common Specifications:

  • AMS 5622 Type 1
  • AMS 5643
  • PW LCS F-17
  • GE S-400 (S-SPEC-35)

Industry Trade Names:

  • Type 630
  • UNS S17400

Common Applications:

  • Aircraft
  • Gas turbines
  • Chemical processing equipment
  • Nuclear reactors

Bars shall be solution heat treated in accordance with AMS-H-6875 by heating to 1900 °F ± 25 °F (1038 °C  ± 14 °C), holding a heat for a time commensurate with section thickness and cooling as required to below 90°F (32 °C).

In the solution heat treated condition the hardness of the bars shall not exceed 363 HB.

Products 8” diameter and less shall meet the following microstructure requirements:

The precipitation heat treat requirements are as follows:

Macrostructure Limits:

Class Condition Severity
1 Freckles A
2 White Spots A
3 Radial Segregation A
4 Ring Pattern B
Rockwell-Industries-Intl-17-4-PH-VAR-ams-5622-image

Composition

Element Min. Max.
Carbon -- 0.07
Manganese -- 1.00
Silicon -- 1.00
Phosphorus -- 0.0025
Sulfur -- 0.015
Chromium 15.00 17.50
Nickel 3.00 5.00
Molybdenum -- 0.50
Copper 3.00 5.00
Columbium 5xC 0.45
Precipitation heat treatments
Condition Temperature Time
H900 900 °F ± 10 °F (482 °C ± 6°C) 1 hour + 15/-0 minutes
H925 925 °F ± 10 °F (496 °C ± 6°C) 4 hours + 30/-0 minutes
H1025 1025 °F ± 10 °F (552 °C ± 6°C) 4 hours + 30/-0 minutes
H1075 1075 °F ± 10 °F (579 °C ± 6°C) 4 hours + 30/-0 minutes
H1100 1100 °F ± 10 °F (593 °C ± 6°C) 4 hours + 30/-0 minutes
H1150 1150 °F ± 10 °F (621 °C ± 6°C) 4 hours + 30/-0 minutes

Minimum tensile properties after precipitation heat treating shall be in accordance to:

Minimum tensile strength properties, inch/pound units

Condition Specimen Orientation Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D % Reduction of Area %
H900 Longitudinal
Transverse
190
190
170
170
10
5
35
15
H925 Longitudinal
Transverse
170
170
155
155
10
6
38
20
H1025 Longitudinal
Transverse
155
155
145
145
12
7
45
27
H1075 Longitudinal
Transverse
145
145
125
125
13
8
45
28
H1100 Longitudinal
Transverse
140
140
115
115
14
9
45
29
H1150 Longitudinal
Transverse
135
135
105
105
16
10
50
30