40Mn high quality carbon structural steel

Yield strength of 40Mn high quality carbon structural steel

Comparison of yield strength and tensile strength of 40Mn high quality carbon structural steel with other steel grades

When selecting suitable steel grades for design and construction, the two most important considerations are the strength of the steel and the tensile and yield strengths. 40Mn high quality carbon structural steel, a type of steel with a carbon content of 0.37%, belongs to 40Mn series plain carbon structural steels with a yield strength of about 420 MPa at 20°C. Depending on the heat-treatment process and different thicknesses, the yield strength values can be up to 495 MPa.

Compared to other plain carbon structural steels, such as the widely used 15Mn, 20Mn and 30Mn, the yield strength of 40Mn low quality carbon structural steel is significantly higher. For instance, the yield strength of 15Mn, 20Mn and 30Mn is respectively 255 MPa, 295 MPa and 345 MPa. 40Mn high quality carbon structural steel also has better mechanical properties, such as improved fatigue and wear resistance, compared to other plain carbon steels.

In terms of tensile strength, 40Mn high quality carbon structural steel is comparable or slightly better than other plain carbon structural steels -- its tensile strength is 510-584 MPa, which is slightly higher than the tensile strength range of 15Mn (490-540 MPa), 20Mn (490-540 MPa) and 30Mn (510-560 MPa).

Conclusion

40Mn high quality carbon structural steel belongs to 40Mn series plain carbon structural steels with a yield strength of about 420 MPa at 20°C. The yield strength of 40Mn low quality carbon structural steel is significantly higher than other plain carbon structural steels, such as the widely used 15Mn, 20Mn and 30Mn. The tensile strength of 40Mn high quality carbon structural steel is in the range of 510-584 MPa, comparable or slightly higher than that of 15Mn, 20Mn and 30Mn. 40Mn high quality carbon structural steel also has better mechanical properties, such as improved fatigue and wear resistance, compared to other plain carbon steels. Therefore, 40Mn high quality carbon structural steel is an ideal material for constructing durable structures.

40Mn high quality carbon structural steel

40Mn high quality carbon structural steel is a medium carbon brass, whose alloy elements are manganese, silicon, vanadium and niobium. It has the characteristics of good plastic and processing performance, high strength, good cold and hot forming performance, and good welding performance.

40Mn high quality carbon structural steel has high strength and hardness and good wear resistance, with a tensile strength of 785-1034 MPa, yield strength of 639-888 MPa and an elongation of 10-30%. 40Mn high quality carbon structural steel can withstand wear and impact at medium and high speeds. Therefore, it is widely used in manufacturing medium and heavy-duty parts, such as thick-walled tubes, bushes, splines, connecting rods, gears, crankshafts and so on.

40Mn high quality carbon structural steel has good heat treatment performance, and it can be hardened by quenching and tempering. Under the condition of heating to 830-860℃ and rapid cooling, the hardness of the steel can reach more than 50HRC. Heat treatment usually includes normalizing, annealing, quenching, tempering and cryogenic treatment

40Mn high quality carbon structural steel has no special requirements for heat treatment, but the use time and cost of the parts should be considered. The quenching temperature should be determined according to the requirements of the purpose, geometry and surface state of the parts. After quenching, the yield strength of 40Mn high quality carbon structural steel is increased by about 44%.

In short, 40Mn high quality carbon structural steel is a commonly used medium carbon alloy structural steel. It has the characteristics of good plasticity, heat treatment performance and weldability, so it is widely used in the manufacture of medium and heavy-duty parts.