Specification for 4 per cent nickel-chromium-molybdenum steel (Air hardening). (1545 MPa: limiting ruling section 63.5mm)

1964 ◽  
Keyword(s):  
Nickel Chromium ◽  
Molybdenum Steel

AISI 9840

Alloy Digest ◽  
1957 ◽  
Vol 6 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Heat Treating ◽  
Good Combination ◽  
Nickel Chromium ◽  
Steel Mills ◽  
Treated Condition ◽  
Heat Treated ◽  
Molybdenum Steel ◽  
Heat Treated Condition ◽  
Lower Nickel

Abstract AISI 9840 is a nickel-chromium-molybdenum steel very similar to AISI 4340 with lower nickel and slightly higher manganese. In the heat treated condition it has good combination of strength, fatigue resistance, toughness and wear resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-55. Producer or source: Alloy steel mills and foundries.

Magnetostrictive Methods of Detecting Torque from Case-Hardened Steel Shafts

1994 ◽  
Vol 360 ◽  
Author(s):  
Ichiro Sasada
Keyword(s):  
Excitation Frequency ◽  
Total Power ◽  
Optimum Operating ◽  
Torque Sensor ◽  
Excitation Current ◽  
Optimum Operating Condition ◽  
Operating Condition ◽  
Nickel Chromium ◽  
Low Profile ◽  
Molybdenum Steel

AbstractThis paper begins with a review of the current problems associated with the application of conventional magnetic-head-type shaft torque sensors. These sensors were first proposedin 1954. Newly developed low-profile magnetic heads for torque sensors which address the problems of the older type of sensors are then presented. The torque sensor which uses the lowprofile pick-up heads is described in detail. Experimental results showing the basicperformance of the torque sensor with carburized nickel chromium molybdenum steel shafts (SNCM 420 in JIS) are then described. In this combination of the heads and the shaft, thehysteresis of the inputoutput relationship is generally small and shows that the direction of traversal around the hysteresis loop changes as the amplitude of the excitation current changes. It is shown that an optimum operating condition exists for the torque sensorin which the hysteresis achieves a minimum value yet the sensitivity remains high. In a particular combination studied in this paper, the optimum excitation current was 0.3 A at the excitation frequency 60 kHz, where the total power loss at the pick-up heads was 0.37W. Under this operating condition, the hysteresis was extremely small, and the linearity was better than 0.6%.

The Evaluation of the Cracking Susceptibility of Alloy 718 in an Acidic Solution

2007 ◽  
Author(s):  
Anand Venkatesh ◽  
Ajit K. Roy
Keyword(s):  
Strain Rate ◽  
Elevated Temperatures ◽  
Fracture Morphology ◽  
Localized Corrosion ◽  
Aqueous Environment ◽  
Alloy 718 ◽  
Nickel Chromium ◽  
Nuclear Heat ◽  
Molybdenum Steel ◽  
Iron Nickel

An austenitic iron-nickel-chromium-molybdenum steel, known as Alloy 718 (N07718), has been investigated for its corrosion resistance in an aqueous environment relevant to the sulfur-iodine (S-I) process, proposed to generate hydrogen using nuclear heat. The slow-strain-rate (SSR) testing method was used to evaluate the cracking susceptibility of this alloy at ambient and elevated temperatures. A strain rate of 3.3 × 10−6 sec−1 was used in these tests. The localized corrosion behavior of this alloy was also evaluated by the cyclic potentiodynamic polarization technique. Further, the fracture morphology of the specimens used in SSR testing was determined by scanning electron microscopy.

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