Steel 25CrMo4
EN 25CrMo4 · AISI/SAE 4130
25CrMo4 (1.7218) is a quenched-and-tempered chromium-molybdenum steel to EN 10083, the European counterpart of AISI 4130 for moderately stressed machined and welded parts.
Values for the Q&T condition
25CrMo4 tempers and conditions
25CrMo4 is supplied in 11 conditions, soft to hard. Q&T is the default FabDigit quotes; the values on this page are for it.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Spheroidize-annealed structure with globular carbides in ferrite — the softest and most cold-formable condition, used for cold heading and cold extrusion. | 330 | 550 | 26 | 170 HB | 45 W/m·K |
Treated for cold shearability | Soft delivery condition heat treated to a low, uniform hardness so that bar can be cold sheared into billets without cracking. | 380 | 600 | 22 | 185 HB | 44 W/m·K |
Annealed | Pick for maximum machinability and cold forming before the part is heat treated. | 400 | 620 | 22 | 200 HB | — |
Specified (Jominy) hardenability, delivered soft/untreated | Grade variant supplied with a guaranteed end-quench hardenability band (J1.5 ≈ 44–49 HRC); bar is normally delivered soft-annealed or normalized before the customer's own hardening. | 430 | 660 | 20 | 200 HB | 44 W/m·K |
Normalized | Pick for uniform fine-grained structure at moderate strength, typical for weldments and tube that will not be re-quenched. | 460 | 700 | 20 | 215 HB | — |
+QT, section 40–100 mm | Pick for heavier forgings/bars where limited hardenability lowers the guaranteed strength class to 700–850 MPa. | 520 | 780 | 18 | 23 HRC | — |
Cold drawn | Pick for close-tolerance bright bar with raised yield and good chip control when no post-machining heat treatment is planned. | 620 | 780 | 10 | 235 HB | — |
Q&TDefault Quenched and tempered | Default stocked condition: balanced 800–950 MPa strength with good toughness for shafts, gears and pressure parts. | 650 | 870 | 16 | 28 HRC | — |
+QT, section ≤ 16 mm | Pick for small shafts, bolts and thin tube where the full 900–1100 MPa strength class of EN 10083-3 is required. | 780 | 980 | 13 | 31 HRC | — |
Q&T to 28–32 HRC | Pick when drawings call out a hardness band (shafts, sprockets, sour-service-adjacent pressure parts limited to ≤ 32 HRC). | 800 | 950 | 15 | 30 HRC | — |
Core hardened | Through-quenched and low-temperature tempered condition giving a hard martensitic core (~30–36 HRC) with restricted core hardenability band. | 900 | 1,100 | 12 | 34 HRC | 42 W/m·K |
What is 25CrMo4?
25CrMo4 (1.7218) is a quenched-and-tempered chromium-molybdenum steel to EN 10083, the European counterpart of AISI 4130 for moderately stressed machined and welded parts. Q&T bar gives 650 MPa yield, 870 MPa tensile, 16 % elongation and 270 HB (28 HRC), and stock is available in +A, +N, +QT, +C, +CH, +H, +S and +AC conditions for bar and forgings. Weldability is good for an alloy steel (score 65) with low-hydrogen filler and preheat on heavier sections, but there is no inherent corrosion resistance and the strength ceiling sits below 34CrNiMo6/4340, which is the step up for heavier sections. 25CrMo4 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). 25CrMo4 has a yield strength of 650 MPa (94.3 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 79% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 25CrMo4 used for?
- Bolts and high-tensile fasteners
- Industrial drive shafts
- Welded tubular frames and structures
- Hydraulic cylinder components
- Gear and sprocket blanks
- Pressure-retaining machined fittings
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- High strength — 650 MPa (94.3 ksi), better than 79% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
25CrMo4 properties
Typical room-temperature values for 25CrMo4-Q&T; bars are the position among steel grades.
Physical3
25CrMo4 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
25CrMo4 has a yield strength of 650 MPa (94.3 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 79% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
25CrMo4 is rated for continuous service to 500°C (932 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
25CrMo4 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 25CrMo4 takes about 31 MJ of energy and emits 2.2 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 30%.
Manufacturability6
25CrMo4's machinability is good (55/100, better than 62% of steel grades); weldability good (65/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 25CrMo4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 25CrMo4
Is 25CrMo4 easy to machine?
Machines like 4130: carbide at 100–160 m/min in Q&T state, rigid setups and positive rake; annealed bar cuts about 70 % of 1212.
Can 25CrMo4 be welded?
Good weldability with low-hydrogen filler (ER80S-D2 / E8018-B2); preheat 150–250 °C on sections above ~10 mm and stress-relieve or re-normalize thick weldments.
Can 25CrMo4 be formed, bent or molded?
Cold bend and roll in +A/+N condition only (generous radii); hot work 850–1100 °C then normalize or re-quench and temper.
Manufacturability
The process limits FabDigit applies to 25CrMo4. Every 25CrMo4 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Better55 / 100 |
|---|---|
| ISO material group | P.2 |
| Cutting speed (rough / finish) | 180 / 210 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair45 / 100 |
|---|---|
| Weldability | Better65 / 100 |
25CrMo4 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.22 – 0.29 | 0.25 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.6 – 0.9 | 0.75 |
| Cr | 0.9 – 1.2 | 1.05 |
| Mo | 0.15 – 0.3 | 0.22 |
| P0.035 max for some product forms | ≤ 0.03 | |
| S+S variant 0.020–0.040 for machinability | ≤ 0.04 | |
| Fe | balance |
What surface finishes work on 25CrMo4?
No inherent corrosion protection — phosphate + paint, zinc or Ni/Cd plating usual; bake after plating to avoid hydrogen embrittlement above ~1000 MPa; polishes to a bright finish.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 25CrMo4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- AISI / SAE
- 4130
- EN / DIN / Werkstoff-Nr.
- 1.7218
- Similar grades
- 25CrMo
How much does 25CrMo4 cost?
25CrMo4 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
25CrMo4 — frequently asked
What is 25CrMo4 used for?
25CrMo4 is typically used for bolts and high-tensile fasteners, industrial drive shafts, welded tubular frames and structures, hydraulic cylinder components, gear and sprocket blanks and pressure-retaining machined fittings. In short: premium Cr-Mo bar.
What is the yield strength of 25CrMo4?
25CrMo4 has a typical yield strength of 650 MPa (94.3 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 79% of steel grades. Strength varies by condition: see the 11 listed tempers.
Is 25CrMo4 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like 4130: carbide at 100–160 m/min in Q&T state, rigid setups and positive rake; annealed bar cuts about 70 % of 1212.
Can 25CrMo4 be welded?
Yes — weldability is rated good (65/100). Good weldability with low-hydrogen filler (ER80S-D2 / E8018-B2); preheat 150–250 °C on sections above ~10 mm and stress-relieve or re-normalize thick weldments.
What surface finishes work on 25CrMo4?
No inherent corrosion protection — phosphate + paint, zinc or Ni/Cd plating usual; bake after plating to avoid hydrogen embrittlement above ~1000 MPa; polishes to a bright finish.
Can 25CrMo4 be formed, bent or molded?
Cold bend and roll in +A/+N condition only (generous radii); hot work 850–1100 °C then normalize or re-quench and temper.
What is the maximum service temperature of 25CrMo4?
25CrMo4 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 25CrMo4 cost?
25CrMo4 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in 25CrMo4?
Yes — 25CrMo4 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10083-3 Steels for quenching and tempering — alloy steels — CEN (2006)
- EN 10297-1 / EN 10305-1 seamless steel tubes (25CrMo4) — CEN (2016)
- GB/T 3077 (25CrMo) — SAC (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- MMPDS-15 (AISI 4130 mechanical property tables) — Battelle/FAA (2020)
- 1.7218 / 25CrMo4 alloy steel datasheet — Böhler / Ovako (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.