Steel 100CrMnSi4-4
EN 100CrMnSi4-4
100CrMnSi4-4 (1.3518) is a Cr-Mn-Si alloyed through-hardening bearing steel with better hardenability than plain 100Cr6, supplied annealed (+A), hot-rolled or cold-drawn and hardened to 60–64 HRC, or 57–59 HRC when stabilized at 250 °C.
Reference datasheet — 100CrMnSi4-4 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
100CrMnSi4-4 tempers and conditions
100CrMnSi4-4 is supplied in 6 conditions, soft to hard. +A is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ADefault Annealed | Standard stock condition for bars and tubes: machine or cold-form the part, then harden. | 400 | 640 | 20 | 195 HB | 42 W/m·K |
Hot rolled / as-rolled, untreated | Cheapest bar condition for forging or re-rolling stock; must be annealed before machining. | 550 | 950 | 10 | 280 HB | 40 W/m·K |
Cold drawn | Choose for close-tolerance, bright bar and wire feeding automatic lathes or cold-heading of ball/roller blanks. | 600 | 760 | 8 | 20 HRC | 5.7 % IACS |
Hardened + dimensional-stabilising temper (230–260 °C), 57–59 HRC | Pick for bearings running at 150–200 °C where dimensional stability matters more than peak hardness. | 1,750 | 2,050 | 1 | 58 HRC | 34 W/m·K |
Bainite hardened (isothermal transformation ~230 °C), 58–62 HRC | Use for shock-loaded or contaminated-lubrication bearings needing higher toughness and compressive residual stress with almost no retained austenite. | 1,800 | 2,100 | 2 | 60 HRC | — |
Hardened + low temper (160–180 °C), 60–64 HRC | Standard finished-bearing condition: oil quench from ~835–860 °C, temper 160–180 °C for maximum rolling-contact fatigue life. | 1,900 | 2,300 | 0.5 | 62 HRC | 33 W/m·K |
What is 100CrMnSi4-4?
100CrMnSi4-4 (1.3518) is a Cr-Mn-Si alloyed through-hardening bearing steel with better hardenability than plain 100Cr6, supplied annealed (+A), hot-rolled or cold-drawn and hardened to 60–64 HRC, or 57–59 HRC when stabilized at 250 °C. It suits medium-section bearing rings and rollers that must harden through the wall. Annealed bar gives about 400 MPa yield, 640 MPa tensile, 20 % elongation, 195 HB and 42 W/m·K thermal conductivity, with service to about 200 °C. At ~1 % C it is effectively unweldable and has no corrosion resistance; 100Cr6 covers thinner sections and 100CrMnSi6-4 deeper hardening. 100CrMnSi4-4 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,370°C (2,498 °F). 100CrMnSi4-4 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 60% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
What is 100CrMnSi4-4 used for?
- Medium-section bearing rings
- Cylindrical and tapered rollers
- Ball bearing inner and outer races
- Cam follower tracks
- Linear guide rails and blocks
- Needle roller pins
- Precision spindle bearing races
Advantages
- Polishes to a fine finish — 85/100, better than 99% of steel grades
Limitations
- Difficult to weld — 10/100, worse than 99% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low electrical conductivity — 5.7 % IACS, worse than 80% of steel grades
100CrMnSi4-4 properties
Typical room-temperature values for 100CrMnSi4-4-+A; bars are the position among steel grades.
Physical3
100CrMnSi4-4 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,370°C (2,498 °F).
Mechanical14
100CrMnSi4-4 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 60% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
100CrMnSi4-4 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
100CrMnSi4-4 conducts electricity at 5.7 % IACS, worse than 80% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 100CrMnSi4-4 takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
100CrMnSi4-4's machinability is fair (45/100, worse than 65% of steel grades); weldability not recommended (10/100); 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. 100CrMnSi4-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 100CrMnSi4-4
Is 100CrMnSi4-4 easy to machine?
Machine only in the spheroidise-annealed state (≤207 HB) with rigid setups and coated carbide; hardened 60+ HRC parts require CBN hard turning or grinding.
Can 100CrMnSi4-4 be welded?
Effectively unweldable at ~1 % C — high crack risk; use mechanical joining or shrink fits, and if welding is unavoidable preheat >300 °C and post-anneal immediately.
Can 100CrMnSi4-4 be formed, bent or molded?
Cold heading and cold rolling of ball/roller blanks are practical only after spheroidising; hot forge 1050–1100 °C, finish above 900 °C, then slow-cool and spheroidise anneal.
100CrMnSi4-4 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 |
|---|---|---|
| CISO 683-17 through-hardening bearing steel | 0.91 – 1.05 | 0.98 |
| Si | 0.45 – 0.75 | 0.6 |
| Mn | 0.95 – 1.25 | 1.1 |
| Cr | 0.9 – 1.2 | 1.05 |
| Moresidual | ≤ 0.1 | 0.03 |
| Niresidual | ≤ 0.25 | 0.1 |
| Curesidual | ≤ 0.3 | 0.12 |
| P | ≤ 0.03 | 0.01 |
| Slow S for rolling-contact cleanliness | ≤ 0.02 | 0.01 |
| Aldeoxidation residual | ≤ 0.05 | 0.02 |
| Fe | balance |
What surface finishes work on 100CrMnSi4-4?
Grind and superfinish/lap raceways for mirror finish; protect with oil, phosphating, black oxide or thin chrome — no anodising, and avoid electroplating without baking to prevent hydrogen embrittlement.
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 100CrMnSi4-4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.3518
How much does 100CrMnSi4-4 cost?
100CrMnSi4-4 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.
100CrMnSi4-4 — frequently asked
What is 100CrMnSi4-4 used for?
100CrMnSi4-4 is typically used for medium-section bearing rings, cylindrical and tapered rollers, ball bearing inner and outer races, cam follower tracks, linear guide rails and blocks and needle roller pins. In short: deeper hardening than 100Cr6; medium-section bearing grade; not weldable.
What is the yield strength of 100CrMnSi4-4?
100CrMnSi4-4 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 100CrMnSi4-4 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the spheroidise-annealed state (≤207 HB) with rigid setups and coated carbide; hardened 60+ HRC parts require CBN hard turning or grinding.
Can 100CrMnSi4-4 be welded?
Not readily — weldability is rated not recommended (10/100). Effectively unweldable at ~1 % C — high crack risk; use mechanical joining or shrink fits, and if welding is unavoidable preheat >300 °C and post-anneal immediately.
What surface finishes work on 100CrMnSi4-4?
Grind and superfinish/lap raceways for mirror finish; protect with oil, phosphating, black oxide or thin chrome — no anodising, and avoid electroplating without baking to prevent hydrogen embrittlement.
Can 100CrMnSi4-4 be formed, bent or molded?
Cold heading and cold rolling of ball/roller blanks are practical only after spheroidising; hot forge 1050–1100 °C, finish above 900 °C, then slow-cool and spheroidise anneal.
What is the maximum service temperature of 100CrMnSi4-4?
100CrMnSi4-4 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.
How much does 100CrMnSi4-4 cost?
100CrMnSi4-4 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, alloy steels and free-cutting steels, Part 17: Ball and roller bearing steels — ISO (2014)
- DIN 17230 — Ball and roller bearing steels (superseded, chemistry origin of 1.3518) — DIN (1980)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (bearing steels) — ASM International (1990)
- ASM Handbook Vol. 16 — Machining — ASM International (1989)
- Bearing steel bar programme (100Cr6 / 100CrMnSi6-4 / 100CrMnSi4-4) physical and heat-treatment data — Ovako / Sandvik / Böhler (2022)
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.