25CrMo4 / 1.7218 Steel
WALDUN is one of the top 25CrMo4 / 1.7218 Steel Manufacturers and Exporters in China. WALDUN is supplying with round,square,flat,block,and shaft etc.
25CrMo4 / 1.7218 Steel is defined as a low alloy steel which contains 1%Cr and 0.2%Mo as strengthening alloy elements.it offers good strength,toughness, corrosion resistance and machinability.Compared with AISI 4140 steel,It has lower carbon,0.28-0.33%,so it can be welded easily. 25CrMo4 / 1.7218 Steel is commonly supplied in the hardened and tempered condition with a hardness range 207-235HB.
25CrMo4 / 1.7218 Steel SUPPLY FORM & SIZE & TOLERANCE
Supply Form | Size(mm) | Process | Tolerance | |
Round | Φ6-Φ100 | Cold Drawn | Bright/Black | Best H11 |
Φ16-Φ350 | Hot Rolled | Black | -0/+1mm | |
Peeled/ground | Best H11 | |||
Φ90-Φ1000 | Hot Forged | Black | -0/+5mm | |
Rough Turned | -0/+3mm | |||
Flat/Square/Block | Thickness :120-800 | Hot Forged | Black | -0/+8mm |
Width:120-1500 | Rough Machined | -0/+3mm |
Remark:Tolerance can be customized as per requests
Chemical Composition per EN 10083-3
GRADE | NUMBER | C | Si | Mn | P | S | Cr | Mo |
25CrMo4 | 1.7218 | 0.22-0.29 | ≤ 0.40 | 0.60-0.90 | ≤ 0.025 | ≤ 0.035 | 0.90-1.20 | 0.15-0.30 |
25CrMo4 / 1.7218 Steel PHYSICAL PROPERTY
Density g/cm3 | 7.85 |
Melting point °C | 1432 |
Poisson’s ratio | 0.27-0.30 |
Machinability (AISI 1212 as 100% machinability) | 70% |
Specific Gravity | 7.8 |
Thermal conductivity W/(m.K) | 46 |
Modulus of Elasticity Tension | 29 |
25CrMo4 / 1.7218 Steel MECHANICAL PROPERTY
Tensile Strength Mpa | Yield Strength Mpa | Elongation % | Hardness HBW | Impact Charpy-V, -18ºC,J | |
60K | ≥ 586 | ≥ 414 | ≥ 18 | 174-237 | ≥ 42 |
75K | ≥ 655 | ≥ 517 | ≥ 17 | 197-235 | ≥ 42 |
25CrMo4 / 1.7218 Steel FORGING
Forging temperature of 25CrMo4 / 1.7218 Steel should be carried out between 950℃-1200℃,The lower the forging-ending temperature ,the finer the grain size .Hold suitable time for the steel to be uinformly heated before forge, but don’t forge below 950℃.25CrMo4 / 1.7218 Steel should be cooled as slowly as possible after forged.
25CrMo4 / 1.7218 Steel NORMALIZING
Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before final heat treatment.Normalizing temperature for 25CrMo4 / 1.7218 Steel should be carried out between 880℃-900℃. hold suitable time for the steel to be uniformly heated to complete the ferrite to austenite transformation.Cool in still air.
25CrMo4 / 1.7218 Steel ANNEALING
25CrMo4 / 1.7218 Steel can be annealed to relieve stress after forging ,and obtain a good structure suitable for machining,Annealing temperature should be carried out between 800℃-850℃, hold suitable time for the steel to be heated uniformly. Cool slowly in the furnace.
25CrMo4 / 1.7218 Steel HARDENING
This heat treatment will obtain martensite structure after quenched,it will increase the surface hardness and strength.25CrMo4 / 1.7218 Steel should be carried out between 870℃-890℃, hold suitable time for the steel to be thoroughly heated, then quench in oil, or water.Tempering should be followed immediately after quenched.
25CrMo4 / 1.7218 Steel TEMPERING
Tempering is usually carried out to relieve stresses from the hardening process, and will optimize hardness and mechanical properties. The actual tempering temperature will be chosen to meet the required properties.Heat the 25CrMo4 / 1.7218 Steel carefully to a suitable temperature ,usually between 400℃-570℃, soak at the temperature for 2 hours per 25mm of ruling section, then cool in air.The lower the tempering temperature the greater the strength. However, Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.
Page Contents
- 25CrMo4 / 1.7218 Steel SUPPLY FORM & SIZE & TOLERANCE
- Chemical Composition per EN 10083-3
- 25CrMo4 / 1.7218 Steel PHYSICAL PROPERTY
- 25CrMo4 / 1.7218 Steel MECHANICAL PROPERTY
- 25CrMo4 / 1.7218 Steel FORGING
- 25CrMo4 / 1.7218 Steel NORMALIZING
- 25CrMo4 / 1.7218 Steel ANNEALING
- 25CrMo4 / 1.7218 Steel HARDENING
- 25CrMo4 / 1.7218 Steel TEMPERING