Effect of molybdenum content on the sulfide stress cracking resistance of AlSl 4130 steel with 0. 035% Cb

Conference · Sun Apr 01 04:00:00 EST 1979 · Corrosion; (United States)

OSTI ID:6216277

Grobner, P J; Sponseller, D L; Diesburg, D E

Laboratory heats of ten wrought steels containing 0 to 2.5% Mo and 0.035% Cb and commercial AISI 4130 steel were tested for mechanical properties and sulfide stress cracking (SSC) resistance in the quenched-and-tempered condition. The steels, representing molybdenum variations of columbium modified AISI 4130 steel, were each tested at several different strength levels. Yield strength increases with increasing molybdenum content. The SSC tests were performed on two types of specimens: (1) simple three-point bending, bent-beam specimens, and (2) environmental fracture toughness specimens of the double cantilever beam type. For steels with a yield strength of 760 MPa (110 ksi), maximum SSC resistance is obtained at a molybdenum concentration of 0.75 or 0.90%, depending on the type of test. These optimum values are rather close to the 0.85% Mo concentration that is necessary to form M/sub 2/C carbides in the present quenched-and-tempered steels. In both types of tests, the SSC resistance of the 0.75% Mo steel in the cast condition is nearly equal to that in the wrought condition, at a yield strength of 760 MPa (110 ksi). The addition of about 0.08% V provides little, if any, practical benefit in SSC resistant steels of the present type for a yield strength of 760 MPa (110 ksi). The results of SSC tests obtained on bent-beam specimens correlate reasonably well with those obtained on fracture thoughness specimens.

• Research Organization: Climax Molybdenum Co. of Michigan, Ann Arbor
• OSTI ID: 6216277
• Conference Information: Journal Name: Corrosion; (United States) Journal Volume: 35:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000 -- Petroleum-- Transport
Handling
& Storage
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION
CORROSIVE EFFECTS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
METALS
MOLYBDENUM
MOLYBDENUM ALLOYS
OIL WELLS
REFRACTORY METALS
STEELS
STRESS CORROSION
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
WELLS