Modified Alloy Steel Round , Hot Rolled Steel Bar AISI 4145H Black
AISI 4145 steel is a chromium molybdenum alloy steel grade widely
used in the oil and gas sectors. Similar to AISI 4140 but with a
higher carbon content. 4145 is more popular in larger diameters due
to its increased strength and harden-ability. AISI 4145 steel is
commonly supplied quenched and tempered with a hardness of between
30 to 36HRc.AISI 4145 steel is commonly used for a variety of
applications in the oil and gas sector. Used often for the
manufacture of down hole drilling tools such as drill collars.
Other applications include gears, shafts for hydraulic presses,
rolls for paper mills, pump shafts and tool holders.
|0.43-0.49||0.85-1.10||0.10-0.35||0.035 max||0.040 max||0.80-1.10||0.25 max||0.15-0.25|
Mechanical Property Requirements:
|Tensile Strength Rm (KSI)||Yield Strength R2 (KSI)||Elongation(%)||Reduction Ration (%)||Izod Impact (J)||Charp Impact (J)||Hardness (HRC)|
|140 min||120 min||14 min||40 min||30-36||248-302|
Heat treatment temperatures, including rate of heating, cooling and
soaking times will vary due to factors such as the shape and size
of each AISI 4145 steel component. Other considerations during the
heat treatment process include the type of furnace, quenching
medium and work piece transfer facilities. Please consult your heat
treatment provider for full guidance on heat treatment of AISI 4145
Annealing: Heat the steel slowly to 800-850°C and allow enough time for the
steel to be thoroughly heated. Cool slowly in the furnace to 480°C
followed by air cooling.
Stress Relieving: When parts are heavily machined, ground or otherwise subject to
cold work, stress relieving will be beneficial prior to hardening.
Hardening: AISI 4145 steel is usually supplied ready heat treated to
30-36HRc. If further heat treatment is required annealed AISI 4145
should be heated slowly to 840-875°C and after adequate soaking at
this temperature quench in oil. Temper as soon as the tools reach
Tempering: Heat carefully to a suitable temperature selected by reference to
a tempering chart or table (usually between 550-700°C, soak at the
temperature for 2 hours per 25mm of ruling section, then allow to
cool in air. Tempering between 250-375°C is not advised as
tempering within this range will seriously reduce the impact values
of this steel.