15-5 - UNS S15500:

Type 15-5 PH is a martensitic precipitation-hardening stainless steel that provides high strength, good corrosion resistance, good mechanical properties at temperatures up to 600°F (316°C) and good toughness in both the longitudinal and transverse directions in both base metal and welds. Short-time, low-temperature heat treatments minimize distortion and scaling. Type 15-5 PH is the ferrite-free version of Type 17-4 PH stainless steel. Both alloys are widely used in the aerospace, chemical, petrochemical, food processing, paper and general metalworking industries.

Physical Properties:

• Melting Point: 2560 - 2625°F (1404 – 1440°C)
• Density: 0.282 lbs/in3 / 7.78 g/cm3
• Modulus of Elasticity in Tension: 28.5 X 106 psi / 196 GPa

Mechanical Properties:

Condition: Solution Treated (A)
• Tensile Strength Minimum (psi): 160,000
• Yield Strength Minimum 0.2% offset (psi): 140,000
• % Elongation in 2” Typical: 8%
• Hardness: Rockwell C35

Condition: Aged (H1075)
• Tensile Strength Typical (psi): 162,000
• Yield Strength Typical 2% offset (psi): 160,000
• % Elongation in 2": 12%
• Hardness: Rockwell C38

Condition: Aged (H900)
• Tensile Strength Typical (psi): 210,000
• Yield Strength Typical 2% offset (psi): 200,000
• % Elongation in 2": 9%
• Hardness: Rockwell C46

Composition:

• Carbon: 0.07 max
• Manganese: 1.00 max
• Phosphorus: 0.040 max
• Sulfur: 0.030 max
• Silicon: 1.00 max
• Chromium: 14.00 - 15.50
• Nickel: 3.50 - 5.50
• Copper: 2.50 - 4.50
• Columbium plus Tantalum: 0.15 - 0.45
• Iron: Balance

Heat Treatments:

15-5 is typically supplied in Condition A, and can be heat treated at a variety of temperatures and times to achieve a wide range of properties. Below is a sampling of standard heat treatments for Condition A 15-5 material:

Condition	Heat To (+/- 15°F / 8.4°C)	Time at Temperature (h)
H900	900°F / 482°C	1
H1025	1025°F / 551°C	4
H1075	1075°F / 580°C	4

Corrosion Resistance:

The general level of corrosion resistance exceeds that of Types 410 and 431, and is approximately equal to that of Type 17-4 PH stainless steel as indicated by laboratory tests in both strongly oxidizing and reducing media, as well as by atmospheric exposures. The general level of corrosion resistance is best in the fully hardened condition, and decreases slightly as the aging temperature is increased.

OD (in.)	KVA STAINLESS MSS As-Welded Tube Capabilities In Inches
0.500
0.625
0.750
0.875
1.00
1.125
1.250
1.375
1.500
1.750
2.000
2.500
	0.016	0.020	0.024	0.028	0.031	0.035	0.039	0.043	0.047	0.051	0.055	0.059	0.063	0.067	0.071	0.075	0.079	0.098	0.110
Wall Thickness (in.)
				New Tooling Required								In House Tooling

OD (mm)	KVA STAINLESS MSS As-Welded Tube Capabilities In Millimeters
12.7
16.0
19.1
22.2
25.4
28.6
31.8
34.9
38.1
44.4
50.8
63.5
	0.40	0.50	0.60	0.70	0.80	0.90	1.00	1.10	1.20	1.30	1.40	1.50	1.60	1.70	1.80	1.90	2.00	2.50	2.75
Wall Thickness (mm)
				New Tooling Required								In House Tooling