25CRMO4/DIN 1.7218 QUALITY ALLOY STEEL

25CrMo4/DIN 1.7218 alloy steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

25CrMo4/DIN 1.7218  is a low-alloy steel containing chromium and molybdenum as strengthening elements.It is a versatile alloy with good atmospheric corrosion resistance and reasonable strength up to around 600º F (315º C),and shows good overall combinations of strength, toughness. weldability,machinability and fatigue strength.This materail is generally used in the quenched and tempered condition.

25CrMo4 Forged shafts
Chemical Composition
National
Standard
Grade C Si Mn Cr Mo P S
DIN 25CrMo4
(1.7218)
0.22-0.29 ≤0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤0.025 ≤0.035
AISI/SAE 4130 0.28-0.33 0.15-0.35 0.4-0.6 0.8-1.1 0.15-0.25 ≤0.035 ≤0.04
JIS SCM430 0.28-0.33 0.15-0.35 0.6-0.85 0.9-1.2 0.15-0.3 ≤0.035 ≤0.04
GB 30CrMo  0.26-0.34  0.17-0.37  0.4-0.7  0.8-1.1  0.15-0.25  ≤0.035  ≤0.035
Size&Tolerance&Process
Shape Size(mm) Process Tolerance Length(mm)
Round Φ6-Φ50 Cold Drawn H11 3000-5800
Round Φ40-Φ300 Hot Rolled -0/+3mm 3000-10000
Round Φ120-Φ1000 Hot Forged -0/+3mm 3000-10000
Flat/Square/Block Thickness:120-800
Width:120-1500
Hot Forged -0/+3mm 500-6000

Heat Treatment
Normalizing For 25CrMo4
1.Nominal normalizing temperature:840-900°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing  For 25CrMo4
1.Nominal Annealing temperature:680-720°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 229

Hardening and Tempering(QT)  For 25CrMo4
1.Nominal Hardening temperature:850-880°C
2.Hold at this temperature then quench in oil or water
3.Tempering  as soon as possible when the temperature low to ambient
4.Heat uniformly to the suitable temperature of 540-650°C
5.keep the material out of the furnace ,then cool in the air

Mechanical Property( for reference only)
1.Tensile strength: 930MPa
2.Yield point: 785MPa
3.Percentage reduction of area after fracture: 50%
4.Elongation after fracture: 12%
5.Impact test (+20°C): Transverse – 27~32J; Longitud – 45~50J

Delivery Condition
1.Shape:Round/Square / Flat/Shafts/Rollers/Blocks
2.Surface condition:Black surface/Bright surface
3.Heat Treatment:Normalized/Annealed/QT
4.Straightness:Max 3mm/m(Enhanced straightness may be available on request)
5.Length:3000-5800mm suitable for 20″container.  above 6000mm,suitable for 40″ container
6.Grain Size: 5-8 acc to ASTM E112-96
7.Ultrasonic Standard: Sep1921/ASTM A388/EN 10228-3
8.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
9.Forging Ratio: minimum 4 : 1
10.Marking: Grade/Weight/Length/Size/Heat Number

Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria