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15-15HS® Stainless Identification
U.S. Patent Number
z 5,094,812
Type Analysis
Carbon (Maximum)0.04%Manganese 16.00 to 19.00%Phosphorus (Maximum)0.050%Sulfur (Maximum)0.050%Silicon (Maximum)  1.00%Chromium 18.00 to 21.00%Nickel (Maximum)  3.00%Molybdenum 0.50 to 3.00%Nitrogen 0.50 to 0.80%Iron Balance
General Information
Description
15-15HS® stainless is an austenitic, nitrogen-strengthened stainless steel. It can be considered for oil and gas industry applications such as nonmagnetic drill collars,
stabilizers, and MWD housings, especially when high strength 140 ksi (966 MPa) min yield strength is desired.
The lower carbon content of 15-15HS stainless results in less tendency for carbides to precipitate in grain boundaries compared with normal chrome-manganese stainless grades. This provides 15-15HS stainless with improved resistance to intergranular stress-corrosion cracking. In addition, nickel, chromium, nitrogen manganese and molybdenum are controlled to enhance the resistance to transgranular attack stress-corrosion cracking and pitting. Typical PRE equivalent is 30.
A post-machining ID compressive stress treatment for drill collars has been developed to further improve the resistance to stress-corrosion cracking.
The high strength of 15-15HS stainless is achieved by warm working on a rotary forge at a temperature below the recrystallization temperature which produces strengths well-above API requirements.
Corrosion Resistance Important Note: The following 5-level rating scale is intended for comparative purposes only. Corrosion testing is recommended; factors which affect corrosion resistance include temperature, concentration, pH, impurities, aeration, velocity, crevices, deposits, metallurgical condition, stress, surface finish and dissimilar metal contact.
Nitric Acid Good Sulfuric Acid Moderate Phosphoric Acid Moderate Acetic Acid Good Sodium Hydroxide Moderate Salt Spray (NaCl)Good Sea Water Moderate Sour Oil/Gas Moderate Humidity Excellent
Properties
Physical Properties
Specific Gravity
--7.76
Density
--0.2800lb/in³
Mean Specific Heat
79 °F, 240 °F0.1180Btu/lb/°F Mean Coefficient of Thermal Expansion
77.00 °F, 212.0 °F8.85x 10-6 in/in/°F 77.00 °F, 350.0 °F9.11x 10-6 in/in/°F 77.00 °F, 392.0 °F9.34x 10-6 in/in/°F 77.00 °F, 482.0 °F9.57x 10-6 in/in/°F 77.00 °F, 572.0 °F9.75x 10-6 in/in/°F 77.00 °F, 662.0 °F9.96x 10-6 in/in/°F 77.00 °F, 752.0 °F10.2x 10-6 in/in/°F 77.00 °F, 842.0 °F10.4x 10-6 in/in/°F 77.00 °F, 932.0 °F10.5x 10-6 in/in/°F 77.00 °F, 1022 °F10.7x 10-6 in/in/°F
Thermal Conductivity
73 °F95.57BTU-in/hr/ft²/°F 122 °F98.84BTU-in/hr/ft²/°F 212 °F104.6BTU-in/hr/ft²/°F 392 °F114.9BTU-in/hr/ft²/°F 572 °F124.5BTU-in/hr/ft²/°F 752 °F133.0BTU-in/hr/ft²/°F
Modulus of Rigidity (G)丰田ft-hs
--27.7x 103 ksi
Temperature Coefficient of Electrical Resistivity
--441x 10-4 Ohm/Ohm/°F
Magnetic Properties
15-15HS stainless is essentially nonmagnetic in both the annealed and warm-worked conditions.
Magnetic permeability of warm-worked material is less than 1.01 based on Severn gauge. ASTM A342 (field strength-200 oersteds): 1.002
Typical Mechanical Properties
Heat Treatment
Annealing
15-15HS stainless is generally used in the as-forged, warm-worked condition. However, if annealing is desired, heat to 1900/2100°F (1040/1150°C), hold for one hour per inch of thickness, and water quench.
Workability
Machinability
Following are starting point feeds and speeds for 15-15HS stainless.
Additional Machinability Notes
Figures used for all metal removal operations covered are starting points. On certain work, the nature of the part may require adjustment of speeds and feeds. Each job has to be developed for best production results with optimum tool life. Speeds or feeds should be increased or decreased in small steps.
Weldability
15-15HS stainless can be readily joined by the standard electric-arc welding methods.
Welding consumables of matching composition are not currently available; however, other stainless steel consumables can be considered depending on the application. Contact Carpenter for specific details on filler metal selection.
Other Information
Forms Manufactured
z Bar-Rounds  z Hollow Bar
z Multi-Dimensional Bar
Disclaimer:
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as they become available.
Unless otherwise specified, registered trademarks are property of
CRS Holdings Inc., a subsidiary of Carpenter Technology Corporation.
Copyright 2004 CRS Holdings Inc. All rights reserved.
Edition Date: 4/28/04