Seamless Steel Tube Library: Chemical Composition and Mechanical Properties of German Standard 25CrMo4 Seamless Steel Tube
Hit：412026-05-14 10:41:06
Seamless Steel Tube Library: Chemical Composition and Mechanical Properties of German Standard 25CrMo4 Seamless Steel Tube
25CrMo4 is a chromium molybdenum alloy structural steel that complies with the EN 10083-3 standard, corresponding to the German plate number 1.7218. It is widely used in the manufacture of high-strength, high toughness, high temperature and high pressure resistant mechanical components, such as gears, shafts, high-pressure pipelines, fasteners, etc.
Chemical composition (mass fraction,%)
According to multiple authoritative public materials, the typical chemical composition of 25CrMo4 is as follows:
Carbon (C): 0.22% -0.29%
Silicon (Si): 0.10% -0.40%
Manganese (Mn): 0.60% -0.90%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Chromium (Cr): 0.90% -1.20%
Molybdenum (Mo): 0.15% -0.30%
Nickel (Ni): ≤ 0.030% (residual)
Copper (Cu): ≤ 0.10% (residual)
Note: There may be slight differences in the upper limits of Si and Mo from different sources (such as Si labeled as 0.15-0.35 or 0.40, Mo labeled as 0.15-0.25), but the mainstream and latest data (2024-2025) generally adopt the above ranges
Mechanical properties (under quenching and tempering treatment)
Tensile strength σ b: ≥ 885 MPa (some data up to 930 MPa)
Yield strength σ s: ≥ 685 MPa (some data shows 785 MPa)
Elongation rate δ 5: ≥ 12%
Shrinkage rate of cross-section: ≥ 50%
Impact energy Akv: ≥ 35 J (some data shows 78 J)
Hardness: ≤ 212 HB (annealed or quenched and tempered state); After carburizing and quenching, the surface hardness can reach 58-62 HRC, and the core hardness is 30-45 HRC
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