Steel 100CrMo7
EN 100CrMo7 · GB GCr18Mo
100CrMo7 (1.3537, GCr18Mo) is a through-hardening chromium-molybdenum rolling-bearing steel with about 1 %C and higher Cr than 100Cr6, which gives deeper hardenability in large cross-sections.
Reference datasheet — 100CrMo7 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 +AC condition
100CrMo7 tempers and conditions
100CrMo7 is supplied in 8 conditions, soft to hard. +AC 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 |
|---|---|---|---|---|---|---|
Annealed | Use when only maximum softness for heavy hot/warm forming is needed and carbide morphology is not yet critical. | 400 | 680 | 22 | 14 HRC | 3.8 % IACS |
+ACDefault Spheroidize annealed | Standard stock condition for bar/tube that will be machined into bearing rings and then hardened. | 420 | 700 | 20 | 210 HB | 42 W/m·K |
Spheroidized, peeled/turned and ground bright bar | Use where decarburised skin must be removed and tight straightness/diameter are needed for roller or pin blanks. | 420 | 700 | 20 | 15 HRC | 3.8 % IACS |
Hot rolled | Mill-supplied uncooled condition for forging shops that will spheroidize in-house; too hard and variable for direct machining. | 600 | 1,000 | 10 | 31 HRC | 3.7 % IACS |
Spheroidize annealed and cold drawn bar | Choose for close-tolerance, bright-surface bar going straight to automatic-lathe machining of small rings, rollers and pins. | 620 | 820 | 10 | 245 HB | — |
Q&T tempered 230–250 °C | Pick for bearings running up to ~200 °C where dimensional stability outranks peak hardness. | 1,750 | 2,050 | 2 | 59 HRC | 35 W/m·K |
Bainite hardened | Choose for large railway, rolling-mill and wind-turbine bearings needing residual compressive stress, higher toughness and tolerance of contaminated lubrication. | 1,750 | 2,100 | 2 | 59 HRC | 35 W/m·K |
Q&T 60–64 HRC | Standard finished-bearing condition: maximum hardness, wear and rolling-contact fatigue life for service below ~150 °C. | 1,900 | 2,250 | 1 | 62 HRC | 34 W/m·K |
What is 100CrMo7?
100CrMo7 (1.3537, GCr18Mo) is a through-hardening chromium-molybdenum rolling-bearing steel with about 1 %C and higher Cr than 100Cr6, which gives deeper hardenability in large cross-sections. Engineers choose it for bearing rings and rollers that must reach 60+ HRC through-section; it is supplied as bar, tube and forged rings, normally spheroidize-annealed near 210 HB (700 MPa tensile, 420 MPa yield, 20 % elongation, 42 W/m·K). Limits are effectively zero weldability, no corrosion resistance without a coating, and service to about 200 °C. Use 100Cr6 for thinner sections or 100CrMo7-4 for heavier walls. 100CrMo7 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F). 100CrMo7 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
What is 100CrMo7 used for?
- Large ball and roller bearings
- Bearing rings and rollers for heavy machinery
- Wind turbine and industrial gearbox bearings
Advantages
- Polishes to a fine finish — 80/100, better than 97% of steel grades
Limitations
- Difficult to weld — 12/100, worse than 96% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
100CrMo7 properties
Typical room-temperature values for 100CrMo7-+AC; bars are the position among steel grades.
Physical3
100CrMo7 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
100CrMo7 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
100CrMo7 is rated for continuous service to 200°C (392 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
100CrMo7 conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 100CrMo7 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability8
100CrMo7's machinability is fair (45/100, worse than 65% of steel grades); weldability not recommended (12/100); 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. 100CrMo7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 100CrMo7
Is 100CrMo7 easy to machine?
Machine only in the spheroidized condition (~210 HB) with sharp coated carbide and rigid setups; after hardening to 60+ HRC use CBN turning or grinding.
Can 100CrMo7 be welded?
Effectively non-weldable at ~1 %C — cracks readily; if unavoidable, preheat 300–400 °C, use low-hydrogen filler and immediately re-anneal.
Can 100CrMo7 be formed, bent or molded?
Cold ring-rolling and cold forging are possible only after full spheroidizing; hot forge 1050–1150 °C and cool slowly to avoid flake/quench cracks.
100CrMo7 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 | 0.93 – 1.05 | 0.99 |
| Si | 0.2 – 0.4 | 0.3 |
| Mn | 0.25 – 0.4 | 0.33 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Cr | 1.65 – 1.95 | 1.8 |
| Mo | 0.15 – 0.3 | 0.22 |
| Niresidual, max | ≤ 0.3 | |
| Curesidual, max | ≤ 0.3 | |
| Alresidual, max | ≤ 0.05 | |
| O≤15 ppm typical for bearing quality | ≤ 0 | |
| Fe | balance |
What surface finishes work on 100CrMo7?
Bearing surfaces are hard-turned, ground and honed/lapped; corrosion protection by oil, phosphating, black oxide or thin dense chrome — no anodising.
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 100CrMo7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.3537
- GB (China)
- GCr18Mo
How much does 100CrMo7 cost?
100CrMo7 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.
100CrMo7 — frequently asked
What is 100CrMo7 used for?
100CrMo7 is typically used for large ball and roller bearings, bearing rings and rollers for heavy machinery and wind turbine and industrial gearbox bearings. In short: deeper-hardening 100Cr6 upgrade; large-section bearing steel; hardens above 60 HRC.
What is the yield strength of 100CrMo7?
100CrMo7 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 53% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 100CrMo7 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the spheroidized condition (~210 HB) with sharp coated carbide and rigid setups; after hardening to 60+ HRC use CBN turning or grinding.
Can 100CrMo7 be welded?
Not readily — weldability is rated not recommended (12/100). Effectively non-weldable at ~1 %C — cracks readily; if unavoidable, preheat 300–400 °C, use low-hydrogen filler and immediately re-anneal.
What surface finishes work on 100CrMo7?
Bearing surfaces are hard-turned, ground and honed/lapped; corrosion protection by oil, phosphating, black oxide or thin dense chrome — no anodising.
Can 100CrMo7 be formed, bent or molded?
Cold ring-rolling and cold forging are possible only after full spheroidizing; hot forge 1050–1150 °C and cool slowly to avoid flake/quench cracks.
What is the maximum service temperature of 100CrMo7?
100CrMo7 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 100CrMo7 +AC and 100CrMo7 QT-250C?
+AC is the default condition — standard stock condition for bar/tube that will be machined into bearing rings and then hardened. QT-250C: pick for bearings running up to ~200 °C where dimensional stability outranks peak hardness. Yield strength is 420 MPa in +AC versus 1,750 MPa in QT-250C.
How much does 100CrMo7 cost?
100CrMo7 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 — Ball and roller bearing steels — ISO/CEN (2014)
- GB/T 18254 (GCr18Mo) — SAC (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Bearing steel grade datasheets (100Cr6 / 100CrMo7 / 100CrMo7-3) — Ovako / Sandvik / Böhler (2022)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
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.