Steel 100CrMnSi6-4
EN 100CrMnSi6-4 · GB GCr15SiMn
100CrMnSi6-4 (1.3520) is a chromium-manganese-silicon through-hardening bearing steel, widely equated with GCr15SiMn, with deeper hardenability than 100Cr6.
Reference datasheet — 100CrMnSi6-4 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 +AC condition
100CrMnSi6-4 tempers and conditions
100CrMnSi6-4 is supplied in 6 conditions, soft to hard. +AC 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 |
|---|---|---|---|---|---|---|
+ACDefault Spheroidize annealed | Standard stocked bar/tube condition: soft, machinable, ready for turning and subsequent hardening. | 430 | 700 | 18 | 195 HB | 43 W/m·K |
Hot rolled | Cheapest mill condition for forging or re-rolling stock; must be spheroidized before machining. | 520 | 950 | 12 | 29 HRC | 7 % IACS |
Spheroidize annealed and cold drawn | Choose for close-tolerance bright bar and wire for cold-formed or automatic-lathe bearing parts. | 660 | 830 | 9 | 240 HB | — |
Hardened and higher-temperature tempered | Pick when the part sees 150–200 °C service and dimensional stability matters more than peak hardness. | 1,750 | 2,000 | 2 | 60 HRC | — |
Bainite hardened | Used for large or shock-loaded rings and railway bearings: residual compressive stress, better toughness and crack resistance than martensitic hardening. | 1,750 | 2,050 | 3 | 60 HRC | — |
Hardened and tempered | Final service condition for rings, balls and rollers: maximum hardness, wear and rolling-contact fatigue life. | 1,900 | 2,200 | 1 | 62 HRC | 35 W/m·K |
What is 100CrMnSi6-4?
100CrMnSi6-4 (1.3520) is a chromium-manganese-silicon through-hardening bearing steel, widely equated with GCr15SiMn, with deeper hardenability than 100Cr6. It is supplied spheroidize annealed (+AC), as-rolled or cold drawn and heat treated to 60–64 HRC, 58–62 HRC stabilized, or bainite hardened (BG) for higher toughness. Annealed bar gives about 430 MPa yield, 700 MPa tensile, 18 % elongation, 195 HB and 43 W/m·K, with service to about 200 °C. It is essentially not weldable (score 10) and has no corrosion resistance; use 100Cr6 for small sections and 100CrMnSi6-6 where hardening depth must be greater. 100CrMnSi6-4 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). 100CrMnSi6-4 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 100CrMnSi6-4 used for?
- Large bearing rings
- Heavy-duty rollers
- Rolling mill bearings
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
100CrMnSi6-4 properties
Typical room-temperature values for 100CrMnSi6-4-+AC; bars are the position among steel grades.
Physical3
100CrMnSi6-4 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).
Mechanical15
100CrMnSi6-4 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
100CrMnSi6-4 is rated for continuous service to 200°C (392 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), better than 51% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
100CrMnSi6-4 conducts electricity at 7 % IACS, worse than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 100CrMnSi6-4 takes about 34 MJ of energy and emits 2.3 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
100CrMnSi6-4's machinability is fair (45/100, worse than 65% of steel grades); weldability not recommended (10/100); 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. 100CrMnSi6-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 100CrMnSi6-4
Is 100CrMnSi6-4 easy to machine?
Machine only in the spheroidized state with sharp carbide tooling and rigid setups; hardened 60+ HRC parts require CBN hard turning or grinding, and finishing is normally by grinding/honing/superfinishing.
Can 100CrMnSi6-4 be welded?
Essentially not weldable — the ~1 %C composition cracks readily; if repair welding is unavoidable, preheat 300–400 °C, use low-hydrogen filler and immediately re-anneal.
Can 100CrMnSi6-4 be formed, bent or molded?
Hot forge 1050–1150 °C with slow cooling and mandatory spheroidize anneal (780–810 °C, slow cool) afterwards; cold heading/rolling only from fully spheroidized bar.
100CrMnSi6-4 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 / GB/T 18254 | 0.93 – 1.05 | 0.99 |
| Si | 0.45 – 0.75 | 0.6 |
| Mn | 0.95 – 1.25 | 1.1 |
| Cr | 1.4 – 1.65 | 1.5 |
| Moresidual | ≤ 0.1 | |
| Niresidual | ≤ 0.25 | |
| Curesidual | ≤ 0.25 | |
| P | ≤ 0.03 | |
| S≤0.015 for premium bearing quality | ≤ 0.03 | |
| Ototal oxygen, bearing cleanliness requirement | ≤ 0 | |
| Fe | balance |
What surface finishes work on 100CrMnSi6-4?
No anodizing; protect with oil, phosphate, black oxide, zinc or thin dense chrome — surfaces polish and superfinish extremely well to Ra < 0.05 µm.
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 100CrMnSi6-4 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 100CrMnSi6-4 cost?
100CrMnSi6-4 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
100CrMnSi6-4 — frequently asked
What is 100CrMnSi6-4 used for?
100CrMnSi6-4 is typically used for large bearing rings, heavy-duty rollers and rolling mill bearings. In short: GCr15SiMn equivalent; deep-hardening bearing steel; superfinishes below Ra 0.05 µm.
What is the yield strength of 100CrMnSi6-4?
100CrMnSi6-4 has a typical yield strength of 430 MPa (62.4 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 51% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 100CrMnSi6-4 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the spheroidized state with sharp carbide tooling and rigid setups; hardened 60+ HRC parts require CBN hard turning or grinding, and finishing is normally by grinding/honing/superfinishing.
Can 100CrMnSi6-4 be welded?
Not readily — weldability is rated not recommended (10/100). Essentially not weldable — the ~1 %C composition cracks readily; if repair welding is unavoidable, preheat 300–400 °C, use low-hydrogen filler and immediately re-anneal.
What surface finishes work on 100CrMnSi6-4?
No anodizing; protect with oil, phosphate, black oxide, zinc or thin dense chrome — surfaces polish and superfinish extremely well to Ra < 0.05 µm.
Can 100CrMnSi6-4 be formed, bent or molded?
Hot forge 1050–1150 °C with slow cooling and mandatory spheroidize anneal (780–810 °C, slow cool) afterwards; cold heading/rolling only from fully spheroidized bar.
What is the maximum service temperature of 100CrMnSi6-4?
100CrMnSi6-4 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 100CrMnSi6-4 cost?
100CrMnSi6-4 is a budget-cost steel ($), 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
- ISO 683-17 Heat-treatable steels — Ball and roller bearing steels — ISO (2014)
- DIN EN ISO 683-17 / Werkstoff 1.3520 designation — DIN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (bearing steels) — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (high-carbon bearing steels) — ASM International (1991)
- Bearing steel bar 100Cr6 / 100CrMnSi6-4 data sheets — Ovako / Sandvik / (2023)
- GCr15SiMn — Mysteel / 1688 (2026)
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.