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Used for structural steel shapes in the construction of bridges, building or similar structures. It may be joined by riveting, bolting or welding.
Machinability
Machinability of Grade 50 alloy is fair. It is basically like AISI 8615 low alloy steel.
Forming
This steel contains more alloying elements than plain carbon steel and thus is somewhat more difficult to form.
Welding
Weldable by all of the standard methods.
Heat Treatment
This steel is used in the "as-supplied" condition. However it is possible to obtain higher level of strength by specifying Quenched and Tempered steel plate as per reference specification ASTM A514 which calls for heating at not less than 1650 F and quenching in water or oil followed by tempering.
Forging
This steel is supplied in plate, shapes and bar forms. It is not subsequently forged by the user.
Hot Working
Hot working may be done if necessary. Consult the steel supplier for information.
Cold Working
Grade 50 is more difficult to cold work than ordinary plain carbon steel. However it can be bent or shaped successfully but requires more force than for plain carbon steel.
Annealing
Annealing, if required, can be done at 1700 f and slow furnace cooled.
Aging
Not applicable.
Tempering
Refer to ASTM A 514 for reference on quenched and tempered steel plate. Tempering of the quenched steel is done at a temperature of 1200 to 1300 F.
Hardening
Hardens by cold working or by heat treatment, quench and tempering per ASTM A514.
Other Comments
This steel is similar to AISI 1330. However Grade 50 requirements are for minimum 50 ksi yield and 65 ksi tensile with 21% elongation. Physical and other mechanical properties are similar to 1330 steel
Physical Data
Density (lb / cu. in.)
0.284
Specific Gravity
7.9
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
0.107
Melting Point (Deg F)
2740
Thermal Conductivity
360
Mean Coeff Thermal Expansion
6.7
Modulus of Elasticity Tension
30
Modulus of Elasticity Torsion
11
Mechanical Data
MSO currently has no data available for this grade.
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