24 July 2021 Structural Steel Bar
41Cr4 Structural Steel Bar
41Cr4 (DIN 1.7035) is the most commonly used alloy structural steel. Its tensile strength, yield strength and hardenability are all higher than China GB Standard grade 40# steel, but its weldability is limited and cracks tend to be formed. 41Cr4 is used for more important quenched parts such as parts that work under alternating loads, parts that are medium-speed and medium-load. After surface hardening can be made for high load and wear resistance, without great impact on the parts, such as gears, sleeves, shafts, crankshafts, pins.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Cu(％) |
|---|---|---|---|---|---|---|---|
| 0.35～0.45 | ≤0.40 | 0.60 ~ 0.90 | ≤0.035 | ≤0.035 | 0.90～1.20 | ≤0.030 | ≤0.030 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Elongation δ5 (%): | Reduction of area ψ (%): | Impact energy Akv (J): | Impact toughness value αkv (J/cm2) | Hardness |
|---|---|---|---|---|---|---|
| ≥ 785(80) | ≥ 980(100) | ≥ 9 | ≥ 45 | ≥ 47 | ≥ 59(6) | ≤ 207 HB |
Heat treatment recommendations:
| Treatment | Condition | Temperature cycle | Cooling/quenching |
|---|---|---|---|
| Soft annealing | +A | 670- 710oC | In air |
| Quench & Tempering | +QT | Austenizing 830 - 860oC Tempering 540 - 680oC | Water or oil |
41Cr4 hardness after heat treatment curve:
Other properties:
| Youngs module (GPa) | Poisson´s ratio (-) | Shear module (GPa) | Density (kg/m3) |
|---|---|---|---|
| 210 | 0.3 | 80 | 7800 |
| Average CTE 20-300°C (µm/m°K) | Specific heat capacity 50/100°C (J/kg°K) | Thermal conductivity Ambient temperature (W/m°K) | Electrical resistivityAmbient temperature (µΩm) |
| 12 | 460 - 480 | 40 - 45 | 0.20 - 0.25 |
Delivery status:
Heat treatment (normalizing, annealing or tempering) or non-heat treatment delivery, delivery status should be specified in the contract.
41Cr4 Material Specification Data Sheet PDF