Mechanical properties and chemical composition of 50Mn bridge slab
50Mn is a high-quality carbon structural steel that implements GB/T 699-1999 standard. The steel plate has high strength, generally used after quenching + tempering, the welding performance is poor, the performance of 50Mn steel plate is close to 50#, but the overall hardenability of the steel plate is higher, and the elasticity, strength and hardness of the steel plate after heat treatment are higher than 50#.
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-18 |
| C |
Si |
Mn |
S |
P |
Cr |
Ni |
Cu |
Cu |
| 0.48～0.56 |
0.17～0.37 |
0.70～1.00 |
≤0.035 |
≤0.035 |
≤0.25 |
≤0.30 |
≤0.25 |
Note:
(1): In order to improve the properties of steel, other trace alloying elements other than the above table can be added, and the data comes from the network and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall comply with the provisions of
GB/T222 50Mn steel plate mechanical properties: tensile strength σb (MPa): ≥645 (66) yield strength σs (MPa): ≥390 (40)
elongation δ5 (%):
≥13
section expansion and contraction ratio ψ (%) ):≥40
impact energy Akv (J): ≥31
impact toughness value αkv (J/cm2): ≥39
50Mn steel plate hardness:
unheat-treated≤ 255HB;
Annealed steel ≤ 217HB50Mn steel plate heat treatment
830 °C normalized 830 °C quenched 600 °C tempered
50Mn steel plate
is used as stress parts, high wear resistant parts, high stress parts, such as the diameter of less than 80 mm mandrel. After high-frequency quenching, it can also manufacture train shafts, worms, connecting rods and automobile crankshafts, such as gears, gear shafts, friction plates, mandrels, plate springs, etc.
