Material Name: high quality carbon structural steel
Grade: 25Mn unified digital code: U21252
Standard: GB / T 699-1999
● Features and application:
25Mn stronger than steel and 20Mn steel 25 are high performance with 25 other steel and 20Mn steel similar to carburizing and welding parts, such as camshafts, gears, couplings, hinges, pins, tow bars and so on.
25mn, compared with 25 steel with high strength and hardenability, good cold plastic deformation and welding of medium, can cut good. Tendency to temper brittleness when heat treatment and thermal sensitivity. For bolts. Nuts. Screw. Rod. A small shaft. Brake Gear.

    ● Chemical Composition:

Carbon C: 0.22 ~ 0.29

Si Si: 0.17 ~ 0.37

Manganese Mn: 0.70 ~ 1.00

Sulfur S: ≤ 0.035

Phosphorus P: ≤ 0.035

     Chromium Cr: ≤ 0.25

Ni-Ni: ≤ 0.30

Copper Cu: ≤ 0.25

25Mn Performance:

Tensile strength σb (MPa): ≥ 490 (50)

Yield strength σs (MPa): ≥ 295 (30)

Elongation δ5 (%): ≥ 22

Reduction of area ψ (%): ≥ 50

Impact energy Akv (J): ≥ 71

Impact toughness αkv (J/cm2): ≥ 88 (9)

Hardness: the hardness of steel delivery status is not heat-treated ≤ 207HB HBS 10/3000

Sample Size: Sample size is 25mm

Heat treatment: 900 ℃ normalizing, 870 ℃ quenching, 600 ℃ tempering. [