Special Grades HY80

 

Principal Design Features

HY-80 is a high yield strength (minimum of 80 ksi) , low carbon, low alloy steel with nickel, molybdenum and chromium. It has excellent weldability and notch toughness along with good ductility even in welded sections.

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Applications

This alloy is best known for use in shipbuilding for welded hull plates and structural use.

Machinability

HY-80 steel is readily machined when in the quenched and tempered condition. It machines with the same feeds and speeds as for other low alloy steels with Rockwell C 20 hardness.

Forming

HY-80 may be readily cold or hot formed by conventional bending, or forming, processes. It does exhibit more springback than plain carbon steel so allowance must be made for that when bend forming.

Welding

Weldments of HY-80 are noted for good ductility, notch toughness and strength. It is best welded using the metal-arc process with low hydrogen electrodes of Type E-10018 or E-11018. Use approved weld procedures so as to not apply too much heat input per inch of weld bead, which would otherwise cause degradation of notch toughness. Electrodes should be warmed before use to drive off any moisture to avoid hydrogen pick-up in the weld. Preheating is not required, except for very heavy section thickness welds or heavily constrained welds. Post-heating is not required but a stress relief anneal, after welding of sections of 1-1/2" thick or greater, is desirable. However the alloy may be used in the as-welded condition.

Heat Treatment

HY-80 is supplied in the quenched and tempered condition so a heat treatment as such is not required. It may be given a stress relief anneal, if deemed necessary, at 1200 F for one hour per inch of thickness followed by slow furnace cooling (not exceeding 200 F per hour) to 500 F, followed by air cooling.

Forging

Because the alloy is supplied in the heat treated and tempered condition it should not be subsequently reheated for forging.

Hot Working

Hot working, if necessary, may be done in the range of 600 to 200 F.

Cold Working

HY-80 has very good ductility and is readily cold worked by conventional means. Bend radii of 2t for material up to one inch thick and 3t for material thickness' of one to two inches thick are recommended.

Annealing

A stress relief anneal may be done at 1200 F for 1 hour per inch of thickness, followed by furnace cooling at a rate not in excess of 200 F per hour down to 500 F. From there it can be air cooled.

Aging

Not applicable to this alloy.

Tempering

HY-80 is supplied in the tempered condition of 80 ksi minimum yield strength. No additional tempering should be attempted.

Hardening

The alloy will harden by cold working. It is supplied in the hardened and tempered condition and should be used that way.

Other Mechanical Properties

HY-80 is noted for notch toughness. Charpy V-notch values are 50 ft lb. for material 1/2" to 1-1/2" thick and 30 ft lb. for over 1-1/2" thick.

Density: 0.28

Specific Gravity: 7.83

Specific Heat: 0.11

Melting Point: 2595

Thermal Conductivity: 264

MCTE: 6.3

MoETensile: 29

MoETorsion: 12

 

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