40Cr hot rolled steel round bars information
40Cr alloy structural steel has higher tensile strength, yield
strength and hardenability than No. 40 steel, but its weldability
is limited and there is a tendency to form cracks. 40Cr is a medium
carbon modulated steel, cold heading die steel. The steel is
moderately priced and easy to process. After proper heat treatment,
certain toughness, plasticity and wear resistance can be obtained.
Normalizing can promote the spheroidization of the structure and
improve the cutting performance of the blank with a hardness less
than 160HBS. Tempering at a temperature of 550~570℃, the steel has
the best comprehensive mechanical properties. The hardenability of
this steel is higher than that of 45 steel, and it is suitable for
surface hardening treatment such as high frequency quenching and
flame quenching. After quenching and tempering, 40Cr steel is used
to manufacture mechanical parts under medium load and medium speed,
such as car steering knuckles, rear half shafts and gears, shafts,
worms, spline shafts, top sleeves on machine tools, etc.; after
quenching and After tempering at medium temperature, it is used to
manufacture parts that bear high load, impact and medium speed
work, such as gears, spindles, oil pump rotors, sliders, collars,
etc.; after quenching and low temperature tempering, it is used to
manufacture parts that bear heavy loads and low impact And parts
with wear resistance and the solid thickness on the cross section
below 25mm, such as worms, spindles, shafts, collars, etc.; after
quenching and tempering and high-frequency surface quenching, they
are used to produce high surface hardness and wear resistance.
Parts with great impact, such as gears, sleeves, shafts, main
shafts, crankshafts, spindles, pins, connecting rods, screws, nuts,
intake valves, etc. In addition, this steel is suitable for
manufacturing various transmission parts for carbonitriding, such
as gears and shafts with larger diameters and good low temperature
toughness.
40Cr hot rolled steel round bars Chemical and Mechanical
Chemical composition
| C(％) | 0.37～0.44 | Si(％) | 0.17～0.37 | Mn(％) | 0.50～0.80 | P(％) | ≤0.030 |
| S(％) | ≤0.030 | Cr(％) | 0.80～1.10 | | | |
Mechanical Properties
The mechanical properties of annealed GB 40CR alloy steel are
outlined in the table below
| Tensile | Yield | Bulk modulus | Shear modulus | Poisson’s ratio | Izod Impact |
| KSI | KSI | KSI | KSI | | ft.lb |
| 76900 | 55800 | 20300 | 11600 | 0.27-0.30 | 84.8 |
Heat treatment Related
- Annealing of 40CR Alloy structural steel
Slowly heated to 850 ℃ and allow enough times, let the steel to be
thoroughly heated, Then cool slowly in the furnace. The 40CR alloy
steel will get MAX 250 HB (Brinell hardness).
- Hardening of 40CR Alloy structural steel
Heated slowly to 880-920°C, Then after adequate soaking at this
temperature quench in oil. Temper as soon as tools reach room
temperature.
Equivalent Of 40Cr alloy Structure Steel
| USA | Germany | China | Japan | France | England | Italy | Poland | ISO | Austria | Sweden | Spain |
| ASTM/AISI/UNS/SAE | DIN,WNr | GB | JIS | AFNOR | BS | UNI | PN | ISO | ONORM | SS | UNE |
| 5140 / G51400 | 41Cr4 / 1.7035 | 40Cr | SCr440 | 42C4 | 530A40 / 530M40 | | | 41Cr4 | | 2245 | |
Applications
GB 40CR steel is widely used for a variety of applications in the
used in the automotive and engineering industries for toolholders
and other such components. Typical applications such as valve
bodies, pumps and fittings, Shaft, the high load of wheel, bolts,
double-headed bolts, gears, etc
Regular size and Tolerance
Steel round bar: Diameter Ø 5mm – 3000mm
Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm
Steel Hexagonal bar: Hex 5mm – 105mm
Others 40CR have not specified size, pls contact our experienced
sales team.
