25CrMo4 – AISI 4130 – SAE4130 – 1.7218 Special Alloy Steel for Structural Use
Description
25CrMo4 is special steel of German steel grade, which is a kind of alloy structure steel, equivalent to 25CrMo in China steel grade and SCM425 in Japan steel grade.
This type of special alloy steel for structural use has the perfect mechanical properties below:
1. Tensile strength σb(MPa) : ≥885(90)
2. Yield strength σs(MPa) : ≥685(70)
3. Elongation δ5 (%) : ≥12
4. Section shrinkage ψ (%)：≥50
5. Impact energy Akv (J)：≥35
6. Impact toughness value αkv (J/cm2)：≥98(10)
7. Hardness: ≤212HB
Therefore, it has the following advantages:
1. High hardenability,
2. Better weldability,
3. Easy to cut,
4. Not easy to cooling crack,
5. Good cold strain plasticity,
6. No temper brittleness
It is widely used to make gear, shaft, instrument, automobile, valve, pipe joint, and other high-pressure pipes and fasteners.
Delivery status:
1. Heat treatment (normalizing, annealing, or high-temperature tempering)
2. Without heat treatment
Chemical Composition of 25CrMo4 (1.7218)
- C (Carbon): 0.22%-0.29%
- Cr (Chromium): 0.90%-1.20%
- Mn (Manganese): 0.60%-0.90%
- Mo (Molybdenum): 0.15%-0.30%
- P (Phosphorus): 0.000%-0.025%
- S (Sulphur): 0.000%-0.035%
- Si (Silicon): 0.10%-0.40%
Equivalent grades of steel 25CrMo4 (1.7218)
- EU (EN): 25CrMo4
- USA: SAE4130
- Germany (DIN,WNr): 25CrMo4
- Japan (JIS): SCM420/SCM430
- France (AFNOR): 25CD4
- England-BS: 708A25 / 708M25 / CFS10
- Italy- UNI: 25CrMo4
- China-GB: 30CrMo
- Sweden-SS: 2225
- Czechia-CSN: 15130
- Finland-SFS: 25CrMo4
- Russia-GOST: 20KHM / 30KHM / 30KHMA
- Inter-ISO: 25CrMo4
Material test certification (MTC) of 25CrMo4 (1.7218) steel from BaoSteel
