Steel 19MnCr5 +AC (Spheroidize annealed)
Heat-treated state
EN 19MnCr5
Choose for cold forged/extruded bearing rings and gear blanks where maximum cold formability is needed.
Values for the +AC condition
Other 19MnCr5 tempers and conditions
19MnCr5 is listed in 8 conditions; see the grade overview at 19MnCr5.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ACThis page Spheroidize annealed | Choose for cold forged/extruded bearing rings and gear blanks where maximum cold formability is needed. | 310 | 520 | 26 | 165 HB | — |
Treated for high shearability | Order for wire and bar that must be cold-sheared into slugs for forging without cracking or excessive tool wear. | 330 | 545 | 24 | 168 HB | — |
+ADefault Annealed | Standard stock condition for bar and tube destined for turning, then carburizing. | 350 | 560 | 22 | 180 HB | — |
Supplied with guaranteed hardenability | Specify when carburizing case/core hardness must be reproducible batch to batch; delivered soft-annealed with a certified Jominy curve. | 350 | 560 | 22 | 43 HRC | 8 % IACS |
Treated to ferrite-pearlite structure and hardness range | Pick when a uniform ferrite–pearlite microstructure is required for consistent machining and predictable carburizing response. | 360 | 580 | 21 | 170 HB | — |
Treated to a specified hardness range | Best all-round condition for high-volume automatic-lathe machining before carburizing, with a guaranteed hardness band. | 400 | 640 | 19 | 190 HB | — |
Hot rolled | Cheapest mill condition for parts that will be re-annealed or normalized before machining. | 430 | 680 | 17 | 205 HB | 8 % IACS |
Carburized and hardened | Final in-service condition for bearing rings, rollers and gears: hard wear-resistant case on a tough core. | 750 | 1,050 | 11 | 60 HRC | — |
What is 19MnCr5 +AC?
19MnCr5 +AC is 19MnCr5 heat treated to +AC — choose for cold forged/extruded bearing rings and gear blanks where maximum cold formability is needed. 19MnCr5 +AC has a yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 83% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi). 19MnCr5 +AC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). +A is the default condition FabDigit quotes; +AC is available on request or by drawing note.
Advantages
- Forms and bends easily — 78/100, better than 91% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
Limitations
- Low strength — 310 MPa (45 ksi), worse than 83% of steel grades
19MnCr5 +AC properties
Typical room-temperature values for 19MnCr5 +AC; 11 are specific to this condition. Other listed values are 19MnCr5 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
19MnCr5 +AC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
19MnCr5 +AC has a yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 83% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
19MnCr5 +AC is rated for continuous service to 350°C (662 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
19MnCr5 +AC conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 19MnCr5 +AC takes about 29 MJ of energy and emits 2.1 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 30%.
Manufacturability8
19MnCr5 +AC's machinability is fair (50/100, worse than 53% of steel grades); weldability fair (50/100); formability very good (78/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 19MnCr5 +AC
Is 19MnCr5 easy to machine?
Machine in +TH or +FP (170–217 HB) with carbide inserts and good coolant; leave grinding stock for post-carburizing distortion.
Can 19MnCr5 be welded?
Weldable in the soft state with low-hydrogen consumables and 150–250 °C preheat (CE ≈ 0.55); never weld after carburizing.
Can 19MnCr5 be formed, bent or molded?
Cold heading/extrusion in the +AC spheroidized condition; hot forge 1100–850 °C then slow-cool or anneal to restore machinability.
What surface finishes work on 19MnCr5?
Carburize 900–930 °C, oil or gas quench, temper 160–200 °C, then hard-turn or grind; protect with oil, phosphate, black oxide or Zn-Ni plating (bake to avoid H embrittlement).
19MnCr5 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 | 0.17 – 0.22 | 0.19 |
| Si | 0.15 – 0.4 | 0.25 |
| Mn | 1.1 – 1.4 | 1.25 |
| Crsome sources give 0.80–1.10 for this grade | 0.9 – 1.2 | 1.05 |
| Pbearing-steel cleanliness limit | ≤ 0.03 | 0.02 |
| Slower S (≤0.015) usual for bearing quality | ≤ 0.04 | 0.02 |
| Moresidual | ≤ 0.08 | 0.03 |
| Niresidual | ≤ 0.3 | 0.1 |
| Curesidual | ≤ 0.3 | 0.15 |
| Fe | balance | — |
19MnCr5 +AC — frequently asked
What is 19MnCr5 +AC used for?
19MnCr5 +AC is typically used for carburized bearing rings, rollers and gears. In short: mn-Cr bearing case-hardening steel; tough core, hard case; 17MnCr5 with tuned hardenability.
What is the yield strength of 19MnCr5 +AC?
19MnCr5 +AC has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 83% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 19MnCr5 +AC easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machine in +TH or +FP (170–217 HB) with carbide inserts and good coolant; leave grinding stock for post-carburizing distortion.
Can 19MnCr5 +AC be welded?
With care — weldability is rated fair (50/100). Weldable in the soft state with low-hydrogen consumables and 150–250 °C preheat (CE ≈ 0.55); never weld after carburizing.
What surface finishes work on 19MnCr5 +AC?
Carburize 900–930 °C, oil or gas quench, temper 160–200 °C, then hard-turn or grind; protect with oil, phosphate, black oxide or Zn-Ni plating (bake to avoid H embrittlement).
Can 19MnCr5 +AC be formed, bent or molded?
Cold heading/extrusion in the +AC spheroidized condition; hot forge 1100–850 °C then slow-cool or anneal to restore machinability.
What is the maximum service temperature of 19MnCr5 +AC?
19MnCr5 +AC is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 19MnCr5 +A and 19MnCr5-CH?
+A is the default condition — standard stock condition for bar and tube destined for turning, then carburizing. CH: final in-service condition for bearing rings, rollers and gears: hard wear-resistant case on a tough core. Yield strength is 350 MPa in +A versus 750 MPa in CH.
Sources
- EN 10084 — Case hardening steels, technical delivery conditions — CEN (2008)
- DIN 17230 — Ball and roller bearing steels (19MnCr5, 1.3523) — DIN (1980)
- ISO 683-17 — Heat-treatable steels, Part 17: Ball and roller bearing steels — ISO (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Stahlschlüssel (Key to Steel) — Verlag Stahlschlüssel Wegst (2019)
- Case-hardening steel 16MnCr5/20MnCr5 datasheets — Ovako / Saarstahl / Deutsche Edelstahlwerke (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.