The stress corrosion resistance and the cryogenic temperature mechanical properties of annealed Nitronic 60 bar material
Ambient and cryogenic temperature mechanical properties and the ambient temperature stress corrosion properties of annealed, straightened, and centerless ground Nitronic 60 stainless steel alloy bar material are presented. The mechanical properties of longitudinal specimens were evaluated at test temperatures from ambient to liquid hydrogen. The tensile test data indicated increasing strength with decreasing temperature to -196 C. Below liquid nitrogen temperature the smooth tensile and notched tensile strengths decreased slightly while the elongation and reduction of area decreased drastically. The Charpy V-notched impact energy decreased steadily with decreasing test temperature. Stress corrosion tests were performed on longitudinal tensile specimens and transverse C-ring specimens exposed to alternate immersion in a 3.5% NaCl bath, humidity cabinet, and a 5% salt spray atmosphere. The longitudinal tensile specimens experienced no corrosive attack. Approximately 3/4 of the transverse C-rings exposed to alternate immersion and to salt spray experienced a pitting attack on the top and bottom ends. Additional stress corrosion tests were performed on transverse tensile specimens. No failures occurred in the 90% stressed specimens exposed for 90 days in the alternate immersion and salt spray environments. Low-temperature mechanical properties of austenitic stainless nickel steel were examined; variables include temperature effects, impact resistance, tensile strength, yield strength, elongation, fracture resistance, modulus of elasticity, shrinkage, notch strength. 2 figures and 5 tables are included.
- Research Organization:
- National Aeronautics and Space Administration, Huntsville, AL (USA). George C. Marshall Space Flight Center
- OSTI ID:
- 7220171
- Report Number(s):
- N-77-16149; NASA-TM-X-73359
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELONGATION
HALIDES
HALOGEN COMPOUNDS
HUMIDITY
IRON ALLOYS
IRON BASE ALLOYS
LOW TEMPERATURE
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
NICKEL ALLOYS
NICKEL STEELS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
VERY LOW TEMPERATURE