Steel 16MnCrB5 +AC+C
Supply condition
EN 16MnCrB5
+AC+C = spheroidized annealed then cold drawn
Bright cold-drawn bar with tight tolerance and good straightness for automatic-lathe parts and shafts prior to carburising.
Values for the +AC+C condition
Other 16MnCrB5 tempers and conditions
16MnCrB5 is listed in 4 conditions; see the grade overview at 16MnCrB5.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Softest condition, chosen for cold extrusion, cold heading and deep upsetting of gear and fastener blanks. | 330 | 520 | 25 | 160 HB | — |
+FPDefault Treated to ferrite-pearlite structure and hardness range | Standard machining condition for hot-rolled/peeled bar destined for gear hobbing before carburising. | 400 | 620 | 20 | 175 HB | — |
+AC+CThis page Spheroidized annealed then cold drawn | Bright cold-drawn bar with tight tolerance and good straightness for automatic-lathe parts and shafts prior to carburising. | 520 | 680 | 11 | 205 HB | — |
Supplied with specified hardenability band (Jominy), properties after… | Choose when Jominy hardenability must be guaranteed; core/case values listed are for the finished carburised, quenched and 180 °C tempered part. | 700 | 950 | 10 | 60 HRC | — |
What is 16MnCrB5 +AC+C?
16MnCrB5 +AC+C is 16MnCrB5 supplied in the +AC+C condition — bright cold-drawn bar with tight tolerance and good straightness for automatic-lathe parts and shafts prior to carburising. 16MnCrB5 +AC+C has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 67% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi). 16MnCrB5 +AC+C 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). +FP is the default condition FabDigit quotes; +AC+C is available on request or by drawing note.
Advantages
- Easy to machine — 65/100, better than 93% of steel grades
Limitations
- Limited ductility — 11%, worse than 89% of steel grades
16MnCrB5 +AC+C properties
Typical room-temperature values for 16MnCrB5 +AC+C; 17 are specific to this condition. Other listed values are 16MnCrB5 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
16MnCrB5 +AC+C 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).
Mechanical15
16MnCrB5 +AC+C has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 67% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
16MnCrB5 +AC+C 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 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
16MnCrB5 +AC+C conducts electricity at 8.5 % IACS, better than 63% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 16MnCrB5 +AC+C takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability8
16MnCrB5 +AC+C's machinability is good (65/100, better than 93% of steel grades); weldability fair (48/100); formability fair (38/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 16MnCrB5 +AC+C
Is 16MnCrB5 easy to machine?
Machine in +FP or +AC+C condition with coated carbide (Vc ≈ 150–220 m/min); gummy in fully spheroidized bar — use positive geometry and sharp edges, finish-grind after carburising.
Can 16MnCrB5 be welded?
Weldable in the soft condition with low-hydrogen consumables and 150–250 °C preheat; avoid welding carburised or hardened zones, and post-weld temper to limit martensite cracking.
Can 16MnCrB5 be formed, bent or molded?
Excellent cold heading and cold extrusion in +AC (phosphate + soap lubrication); hot forge at 1100–850 °C then normalise at 880–920 °C to restore uniform grain.
What surface finishes work on 16MnCrB5?
Not anodisable — carburise 900–930 °C, oil quench, temper 150–200 °C, then shot peen for fatigue and protect with black oxide, phosphate or zinc/Zn-Ni plating (bake to avoid hydrogen embrittlement).
16MnCrB5 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 | 0.14 – 0.19 | 0.16 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 1 – 1.3 | 1.15 |
| P | ≤ 0.03 | 0.02 |
| Smax; +S variants to 0.020-0.040 | ≤ 0.04 | 0.02 |
| Cr | 0.8 – 1.1 | 0.95 |
| Bboron effective only with Ti/Al nitrogen fixing | 8×10⁻⁴ – 0.01 | 0 |
| Fe | balance | — |
16MnCrB5 +AC+C — frequently asked
What is 16MnCrB5 +AC+C used for?
16MnCrB5 +AC+C is typically used for gears, small shafts and case-hardened components. In short: boron-boosted 16MnCr5; low-cost case-hardening gear steel; strong cold-heading response.
What is the yield strength of 16MnCrB5 +AC+C?
16MnCrB5 +AC+C has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 67% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is 16MnCrB5 +AC+C easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Machine in +FP or +AC+C condition with coated carbide (Vc ≈ 150–220 m/min); gummy in fully spheroidized bar — use positive geometry and sharp edges, finish-grind after carburising.
Can 16MnCrB5 +AC+C be welded?
With care — weldability is rated fair (48/100). Weldable in the soft condition with low-hydrogen consumables and 150–250 °C preheat; avoid welding carburised or hardened zones, and post-weld temper to limit martensite cracking.
What surface finishes work on 16MnCrB5 +AC+C?
Not anodisable — carburise 900–930 °C, oil quench, temper 150–200 °C, then shot peen for fatigue and protect with black oxide, phosphate or zinc/Zn-Ni plating (bake to avoid hydrogen embrittlement).
Can 16MnCrB5 +AC+C be formed, bent or molded?
Excellent cold heading and cold extrusion in +AC (phosphate + soap lubrication); hot forge at 1100–850 °C then normalise at 880–920 °C to restore uniform grain.
What is the maximum service temperature of 16MnCrB5 +AC+C?
16MnCrB5 +AC+C 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.
Sources
- EN 10084 — Case hardening steels: technical delivery conditions — CEN (2008)
- EN 10277 — Bright steel products: technical delivery conditions — CEN (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals (boron hardenability) — ASM International (2013)
- Case-hardening steel bar datasheets (16MnCr5 / 16MnCrB5 class) — European long-products mills (2022)
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.