Steel 100CrMo7-3
EN 100CrMo7-3
100CrMo7-3 (1.3536) is a chromium-molybdenum through-hardening bearing steel in the EN alloy-steel family, with molybdenum added to raise hardenability in large sections.
Reference datasheet — 100CrMo7-3 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
100CrMo7-3 tempers and conditions
100CrMo7-3 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 | Pick the soft (spheroidize) annealed condition, ≤240 HB, the usual delivery state, for turning and cold forming before final quenching and tempering. | 430 | 700 | 18 | 207 HB | 44 W/m·K |
Hot rolled | Order as-rolled bar or tube as blank stock at 290 HB when you will do your own annealing, forging or post-forge heat treatment in house. | 550 | 950 | 10 | 30 HRC | 3.9 % IACS |
Normalized | Use normalizing as an intermediate step after forging to remove carbide networks and refine the structure; spheroidize annealing is still required before machining. | 600 | 1,000 | 9 | 31 HRC | 3.9 % IACS |
Cold drawn | Choose cold drawn bar from spheroidize-annealed stock for precision small-diameter roller and pin blanks; tolerances tighten and hardness rises to 245 HB, formability drops to 20. | 620 | 820 | 10 | 23 HRC | 3.9 % IACS |
Hardened + dimensional-stabilizing temper (S1, ~240 °C), 57–60 HRC | Use the hardened plus S1 stabilizing temper near 240 °C, 57–60 HRC, for bearings working up to 200 °C, trading a little hardness for dimensional stability. | 1,700 | 2,000 | 1.5 | 58 HRC | 3.3 % IACS |
Bainite hardened (austempered), 58–62 HRC | Choose bainite hardening (austempering) at 58–62 HRC for large wind-turbine and rolling-mill bearings: residual compressive stress, toughness and contamination tolerance beat martensitic quenching. | 1,750 | 2,100 | 2 | 60 HRC | — |
Through hardened + tempered ~200 °C, 58–62 HRC | Pick the higher temper near 200 °C for 58–62 HRC when large rings or shock loading need more toughness and dimensional stability than the peak-hardness temper gives. | 1,800 | 2,150 | 1 | 60 HRC | — |
Through hardened + tempered 160–180 °C, 60–64 HRC | Specify oil quenching from 830–860 °C plus tempering at 160–180 °C to 60–64 HRC for finished bearings: peak hardness and contact fatigue life, limited to 150 °C service. | 1,900 | 2,350 | 0.5 | 62 HRC | 34 W/m·K |
What is 100CrMo7-3?
100CrMo7-3 (1.3536) is a chromium-molybdenum through-hardening bearing steel in the EN alloy-steel family, with molybdenum added to raise hardenability in large sections. It is bought as annealed or normalized bar, tube and forged rings and then hardened to 58-62 or 60-64 HRC; the as-supplied condition shows about 430 MPa yield, 700 MPa tensile, 18% elongation, 207 HB and 44 W/m·K thermal conductivity. It is effectively non-weldable (weldability score 12), has no corrosion resistance and needs grinding after hardening. 100Cr6 covers smaller sections at lower cost. 100CrMo7-3 has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,400°C (2,552 °F). 100CrMo7-3 has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 51% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
What is 100CrMo7-3 used for?
- Large bearing rings
- Rolling mill bearings
- Wind turbine main bearing rings
- Large tapered and cylindrical rollers
- Spherical roller bearing raceways
- Heavy-section thrust washers
- Cam follower rollers
Advantages
- Polishes to a fine finish — 85/100, better than 99% 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 — 3.9 % IACS, worse than 83% of steel grades
100CrMo7-3 properties
Typical room-temperature values for 100CrMo7-3-+A; bars are the position among steel grades.
Physical3
100CrMo7-3 has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical14
100CrMo7-3 has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 51% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
100CrMo7-3 is rated for continuous service to 200°C (392 °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
100CrMo7-3 conducts electricity at 3.9 % IACS, worse than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 100CrMo7-3 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability6
100CrMo7-3's machinability is fair (45/100, worse than 65% of steel grades); weldability not recommended (12/100); formability fair (35/100).
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. 100CrMo7-3 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 100CrMo7-3
Is 100CrMo7-3 easy to machine?
Turn only in the spheroidize-annealed condition (<= 240 HB) using coated carbide at low speed and high feed. Once hardened, finish by grinding or CBN hard turning.
Can 100CrMo7-3 be welded?
The high carbon equivalent and crack sensitivity make it non-weldable for practical purposes. Where unavoidable, limit to localized induction or laser welding followed immediately by tempering.
Can 100CrMo7-3 be formed, bent or molded?
Annealed material can be warm forged or cold headed into ring and roller blanks. Re-spheroidize anneal after forming, before hardening.
100CrMo7-3 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 | 0.98 |
| Si | 0.2 – 0.4 | 0.28 |
| Mn | 0.6 – 0.8 | 0.7 |
| Cr | 1.65 – 1.95 | 1.8 |
| MoMo raises hardenability for large sections | 0.2 – 0.35 | 0.3 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Niresidual, max | ≤ 0.3 | |
| Curesidual, max | ≤ 0.3 | |
| Ototal oxygen, max (bearing cleanliness) | ≤ 0 | |
| Fe | balance |
What surface finishes work on 100CrMo7-3?
The standard route is grinding plus superfinishing, with raceways at Ra 0.05-0.2 µm. Corrosion protection relies on oiling, phosphating or blackening, as the steel has no inherent corrosion resistance.
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 100CrMo7-3 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.3536
How much does 100CrMo7-3 cost?
100CrMo7-3 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.
100CrMo7-3 — frequently asked
What is 100CrMo7-3 used for?
100CrMo7-3 is typically used for large bearing rings, rolling mill bearings, wind turbine main bearing rings, large tapered and cylindrical rollers, spherical roller bearing raceways and heavy-section thrust washers. In short: large-section 100Cr6 upgrade; deep-hardening bearing steel; through-hardened raceways.
What is the yield strength of 100CrMo7-3?
100CrMo7-3 has a typical yield strength of 430 MPa (62.4 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 51% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 100CrMo7-3 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Turn only in the spheroidize-annealed condition (<= 240 HB) using coated carbide at low speed and high feed. Once hardened, finish by grinding or CBN hard turning.
Can 100CrMo7-3 be welded?
Not readily — weldability is rated not recommended (12/100). The high carbon equivalent and crack sensitivity make it non-weldable for practical purposes. Where unavoidable, limit to localized induction or laser welding followed immediately by tempering.
What surface finishes work on 100CrMo7-3?
The standard route is grinding plus superfinishing, with raceways at Ra 0.05-0.2 µm. Corrosion protection relies on oiling, phosphating or blackening, as the steel has no inherent corrosion resistance.
Can 100CrMo7-3 be formed, bent or molded?
Annealed material can be warm forged or cold headed into ring and roller blanks. Re-spheroidize anneal after forming, before hardening.
What is the maximum service temperature of 100CrMo7-3?
100CrMo7-3 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 100CrMo7-3 +A and 100CrMo7-3-BH?
+A is the default condition — pick the soft (spheroidize) annealed condition, ≤240 HB, the usual delivery state, for turning and cold forming before final quenching and tempering. BH: choose bainite hardening (austempering) at 58–62 HRC for large wind-turbine and rolling-mill bearings: residual compressive stress, toughness and contamination tolerance beat martensitic quenching. Yield strength is 430 MPa in +A versus 1,750 MPa in BH.
How much does 100CrMo7-3 cost?
100CrMo7-3 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.
Sources
- ISO 683-17 Heat-treatable steels — Part 17: Ball and roller bearing steels — ISO (2014)
- DIN EN ISO 683-17 / Werkstoff 1.3536 — DIN (2015)
- GB/T 18254 (GCr18Mo ) — SAC (2016)
- ASM Handbook Vol. 1 — Bearing Steels — ASM International (1990)
- Bearing steel 100CrMo7-3 bar and tube data — Ovako / Sandvik / Chinese bearing-steel mills (2023)
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.