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40NICRMO84 Alloy Steel Round Bar

Carbon 0.35-0.45% Silicon 0.10-0.35%
Nickel 1.30-1.80% Manganese 0.45-0.70%
Chromium 0.90-1.40% Phosphorous 0.05% max
Molybdenum 0.20-0.35% Sulphur 0.05% max

40NICRMO84 steel is high tensile alloy steel famed for its wear resistance properties and in addition where high strength properties are required. This Grade is used in components akin to gears, shafts, studs and bolts, its hardness is within the range 248/302 HB. It may be further surface-hardened to create add-ons with more advantageous wear resistance by means of induction or nitriding processing.

Steel Properties

Standard high-speed steel qrade. Itswell-balanced alloy composition forms the basis of its high_touqhn-essand good clllting edge retention, rendenng it $uitable for a large variety of appllcatons.

Physical Properties

Thermal Conductivity at °C 20 350 700
W/(m*K) 40.5 32.5 25.5


40NICRMO84 was originally introduced for use in the motor vehicle and machine tool industries for gears, pinions, shafts, spindles and the like. Later its applications became much more extended. Suitable to produce parts for such as locomotives, cranes, rolling mills, coal cutting machinery etc. where good strength and fatigue resistance is called for. Other applications for 40NICRMO84 and 40NICRMO84T are found in die casting and hot metal working, such as die bolsters, racks and pinions, angle pins for pressure die casting, hot stamping dies for aluminium stamping, die beds for steel stamping, lower temperature nut, bolt and rivet heading dies, large section drop forging dies.

It is widely used in the plastic and rubber moulding industries for moulds (particularly rubber moulds), hob retaining rings, patens, retaining rings for built up moulds, stop pins for moulds. For moulds 40NICRMO84 is normally supplies hardened and tempered to ‘T’ condition. If a higher hardness is desired 40NICRMO84T should be annealed and then heat treated to the required hardness.

Heat Treatment

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each 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 alloy steel.

Soft annealing °C Cooling Hardness HB
650-700 slowly max. 280

Stress-relief annealing °C 630 - 650
Cooling Furnace

1st pre-heating °C 2nd and 3rd Hardening °C Quenching Tempering °C Hardness after Teperature HRC
up to approx. 400 in an air-circulating furnace 780 and 1000 1190 - 1230 Saltbath, at least 520 °C Oil ,Air at least twice 530-560 64 – 66