Steel 100CrMn6
EN 100CrMn6 · GB GCr15SiMn
100CrMn6 (1.3520) is a through-hardening high-carbon chromium bearing steel in which added silicon and manganese deepen hardenability relative to 100Cr6, so larger cross-sections still reach 60–64 HRC after through-hardening.
Reference datasheet — 100CrMn6 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +A condition
100CrMn6 tempers and conditions
100CrMn6 is supplied in 8 conditions, soft to hard. +A is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ADefault Annealed | Standard delivery condition for bars, tubes and rings — soft enough to turn/drill before through hardening. | 410 | 660 | 22 | 200 HB | 44 W/m·K |
Normalized | Used after forging to break up carbide networks and homogenize structure before spheroidizing. | 520 | 900 | 12 | 29 HRC | 6 % IACS |
Hot rolled | Mill-edge stock for forging or ring rolling; hard, unmachined, must be spheroidize annealed before machining. | 550 | 950 | 12 | 31 HRC | 6 % IACS |
Cold drawn | Bright drawn bar with close diameter tolerance and good surface for automatic-lathe parts prior to hardening. | 620 | 780 | 10 | 21 HRC | 6 % IACS |
TH + S2 | For elevated-temperature bearings up to ~200 °C, trading some hardness and load rating for stability. | 1,650 | 1,950 | 1.5 | 57 HRC | 5 % IACS |
TH + S1 | Choose when the bearing runs up to ~150 °C and dimensional stability matters more than peak hardness. | 1,780 | 2,100 | 1 | 59 HRC | 5 % IACS |
Bainite hardened (austempered ~230 °C), 58–62 HRC | Pick for large rings and shock/contaminated-lubrication service: compressive surface stresses, higher toughness, less distortion than martensitic hardening. | 1,820 | 2,150 | 2 | 60 HRC | 5 % IACS |
through hardened (830–860 °C oil/salt quench) + tempered 160–180 °C | Standard finished bearing condition: maximum contact-fatigue life and wear resistance for service below ~120 °C. | 1,900 | 2,250 | 0.5 | 62 HRC | 36 W/m·K |
What is 100CrMn6?
100CrMn6 (1.3520) is a through-hardening high-carbon chromium bearing steel in which added silicon and manganese deepen hardenability relative to 100Cr6, so larger cross-sections still reach 60–64 HRC after through-hardening. It is bought as spheroidise-annealed bar, tube and forged ring blanks: 410 MPa yield, 660 MPa tensile, 22 % elongation, about 200 HB (94 HRB) and 44 W/(m·K) in that state. At roughly 1 % C it is effectively non-weldable, softens above the 150 °C service limit and has no corrosion resistance; use 100Cr6 for smaller sections. 100CrMn6 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,400°C (2,552 °F). 100CrMn6 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 57% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is 100CrMn6 used for?
- Large bearing rings
- Heavy-duty rollers
- Wind turbine bearings
Advantages
- Polishes to a fine finish — 85/100, better than 99% of steel grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 99% of steel grades
- Difficult to weld — 12/100, worse than 96% of steel grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 82% of steel grades
- Low electrical conductivity — 6 % IACS, worse than 78% of steel grades
100CrMn6 properties
Typical room-temperature values for 100CrMn6-+A; bars are the position among steel grades.
Physical3
100CrMn6 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
100CrMn6 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 57% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
100CrMn6 is rated for continuous service to 150°C (302 °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
100CrMn6 conducts electricity at 6 % IACS, worse than 78% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 100CrMn6 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability7
100CrMn6's machinability is fair (45/100, worse than 65% of steel grades); weldability not recommended (12/100); formability fair (40/100).
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. 100CrMn6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 100CrMn6
Is 100CrMn6 easy to machine?
Machine only in the spheroidize-annealed condition with sharp carbide tooling and rigid setups (~35 % of AISI 1212); once hardened above 58 HRC use grinding, honing or CBN hard turning.
Can 100CrMn6 be welded?
Effectively non-weldable (1 %C): if repair is unavoidable, preheat 300–400 °C, use low-hydrogen or Ni-based filler and re-anneal immediately.
Can 100CrMn6 be formed, bent or molded?
Hot forge 1050–850 °C then slow-cool/normalize and spheroidize; cold ring rolling and cold heading only from the fully annealed state.
100CrMn6 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 |
|---|---|---|
| CGB/T 18254 GCr15SiMn: 0.95–1.05 | 0.93 – 1.05 | 1 |
| Si | 0.45 – 0.75 | 0.6 |
| MnEN: 1.00–1.20 | 0.95 – 1.25 | 1.1 |
| Cr | 1.4 – 1.65 | 1.5 |
| Moresidual | ≤ 0.1 | 0.03 |
| Niresidual | ≤ 0.3 | 0.1 |
| Curesidual | ≤ 0.3 | 0.1 |
| P | ≤ 0.03 | 0.01 |
| S≤0.025 in some grades | ≤ 0.02 | 0.01 |
| Ototal oxygen, cleanliness requirement | ≤ 0 | 8×10⁻⁴ |
| Fe | balance |
What surface finishes work on 100CrMn6?
Not anodizable — protect with oil, phosphate, black oxide, zinc or hard chrome; the clean fine-carbide microstructure superfinishes to Ra <0.05 µm raceways.
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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 100CrMn6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.3520
- GB (China)
- GCr15SiMn
How much does 100CrMn6 cost?
100CrMn6 is a budget-cost steel ($), cheaper than about 90% 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.
100CrMn6 — frequently asked
What is 100CrMn6 used for?
100CrMn6 is typically used for large bearing rings, heavy-duty rollers and wind turbine bearings. In short: deeper-hardening 100Cr6; 60–64 HRC raceways; large-section bearing steel.
What is the yield strength of 100CrMn6?
100CrMn6 has a typical yield strength of 410 MPa (59.5 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 57% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 100CrMn6 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the spheroidize-annealed condition with sharp carbide tooling and rigid setups (~35 % of AISI 1212); once hardened above 58 HRC use grinding, honing or CBN hard turning.
Can 100CrMn6 be welded?
Not readily — weldability is rated not recommended (12/100). Effectively non-weldable (1 %C): if repair is unavoidable, preheat 300–400 °C, use low-hydrogen or Ni-based filler and re-anneal immediately.
What surface finishes work on 100CrMn6?
Not anodizable — protect with oil, phosphate, black oxide, zinc or hard chrome; the clean fine-carbide microstructure superfinishes to Ra <0.05 µm raceways.
Can 100CrMn6 be formed, bent or molded?
Hot forge 1050–850 °C then slow-cool/normalize and spheroidize; cold ring rolling and cold heading only from the fully annealed state.
What is the maximum service temperature of 100CrMn6?
100CrMn6 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 100CrMn6 +A and 100CrMn6-BH?
+A is the default condition — standard delivery condition for bars, tubes and rings — soft enough to turn/drill before through hardening. BH: pick for large rings and shock/contaminated-lubrication service: compressive surface stresses, higher toughness, less distortion than martensitic hardening. Yield strength is 410 MPa in +A versus 1,820 MPa in BH.
How much does 100CrMn6 cost?
100CrMn6 is a budget-cost steel ($), cheaper than about 90% 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.
Sources
- EN ISO 683-17 Heat-treatable steels — Part 17: Ball and roller bearing steels — ISO/CEN (2014)
- DIN 17230 / Werkstoff-Nr. 1.3520 (100CrMn6) — DIN (1980)
- GB/T 18254 (GCr15SiMn) — SAC (2016)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys (bearing steels) — ASM International (1990)
- Bearing steel grade data (100Cr6 / 100CrMnSi6-4) — Ovako / Sandvik / Böhler (2022)
- GCr15SiMn — Mysteel / 1688 (2025)
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.