Steel Cronidur 30
UNS S42086 · EN X30CrMoN15-1
Cronidur 30 (X30CrMoN15-1, S42086) is a nitrogen-alloyed 15% chromium martensitic stainless bearing steel in which nitrogen replaces part of the carbon to refine the carbonitride structure.
Reference datasheet — Cronidur 30 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 H+DF+T180 condition
Cronidur 30 tempers and conditions
Cronidur 30 is supplied in 4 conditions, soft to hard. H+DF+T180 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Delivery condition for machining of rings and shafts before hardening. | 600 | 900 | 14 | 26 HRC | — |
Hardened, deep-frozen and high-temperature tempered ~480–525 °C | Secondary-hardening temper for elevated-temperature dimensional stability (service to ~400 °C) at slightly reduced hardness and corrosion resistance. | 1,700 | 1,950 | 6 | 57 HRC | 2.4 % IACS |
Hardened, deep-frozen and tempered 250 °C | Slightly softer, more dimensionally stable condition for bearings running near 200 °C. | 1,780 | 2,000 | 5 | 58 HRC | 2.3 % IACS |
H+DF+T180Default Hardened, deep-frozen and tempered 180 °C | Standard bearing condition: max hardness and rolling contact fatigue life for service up to ~250 °C. | 1,850 | 2,100 | 4 | 59 HRC | — |
What is Cronidur 30?
Cronidur 30 (X30CrMoN15-1, S42086) is a nitrogen-alloyed 15% chromium martensitic stainless bearing steel in which nitrogen replaces part of the carbon to refine the carbonitride structure. Hardened, deep-frozen and tempered it reaches about 59 HRC with 1850 MPa yield and 2100 MPa tensile strength, giving rolling contact fatigue life and corrosion resistance (score 58) above 440C; it is supplied as bar and forged rings for aerospace and marine bearings. Elongation is only 4%, service temperature is limited to about 250 °C, machinability is low (score 12) and cost and availability are restrictive. 440C or M50NiL are the usual alternatives. Cronidur 30 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,400°C (2,552 °F). Cronidur 30 has a yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,100 MPa (305 ksi) — stronger than 99% of steel grades. Elongation at break is 4% and the elastic modulus is 200 GPa (29 Msi).
What is Cronidur 30 used for?
- Aerospace bearings
- Marine bearings
- High-performance corrosion-resistant bearings
Advantages
- Polishes to a fine finish — 90/100, better than 100% of steel grades
- High strength — 1,850 MPa (268 ksi), better than 99% of steel grades
- Good corrosion resistance — 58/100, better than 99% of steel grades
Limitations
- Low fracture toughness — 20 MPa·√m (18.2 ksi·√in), worse than 99% of steel grades
- Difficult to machine — 12/100, worse than 99% of steel grades
- Limited formability — 5/100, worse than 99% of steel grades
- Limited ductility — 4%, worse than 98% of steel grades
- Poor heat conductor — 16 W/m·K (9.24 BTU/hr·ft·°F), worse than 98% of steel grades
Cronidur 30 properties
Typical room-temperature values for Cronidur 30-H+DF+T180; bars are the position among steel grades.
Physical3
Cronidur 30 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
Cronidur 30 has a yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,100 MPa (305 ksi) — stronger than 99% of steel grades. Elongation at break is 4% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Cronidur 30 is rated for continuous service to 250°C (482 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), worse than 98% of steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
Cronidur 30 conducts electricity at 2.3 % IACS, worse than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 99% of steel grades.
Sustainability4
Producing a kilogram of Cronidur 30 takes about 85 MJ of energy and emits 5.5 kg of CO₂ — more than 98% of steel grades. Typical recycled content is 25%.
Manufacturability7
Cronidur 30's machinability is not recommended (12/100, worse than 99% of steel grades); weldability poor (15/100); formability not recommended (5/100).
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. Cronidur 30 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Cronidur 30
Is Cronidur 30 easy to machine?
Machine rings and shafts in the annealed state with rigid setups and coated carbide at low speed; after hardening only grinding, honing and CBN hard turning are practical.
Can Cronidur 30 be welded?
Not recommended — high C+N martensite is highly crack sensitive; if unavoidable use electron-beam/laser with preheat and immediate re-heat-treatment.
Can Cronidur 30 be formed, bent or molded?
Hot forge 1100–850 °C with slow controlled cooling and immediate soft anneal; no cold forming in hardened condition.
Cronidur 30 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 | 0.25 – 0.35 | 0.31 |
| Ndissolved by pressurized ESR (PESR) | 0.3 – 0.5 | 0.38 |
| Cr | 14 – 16 | 15.2 |
| Mo | 0.85 – 1.1 | 1 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.4 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Fe | balance |
What surface finishes work on Cronidur 30?
Passivate per ASTM A967 after grinding; superfinish/lap raceways for maximum RCF life; PVD (TiN/DLC) or black oxide can be applied below the tempering temperature.
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 Cronidur 30 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S42086
- EN / DIN / Werkstoff-Nr.
- X30CrMoN15-1
How much does Cronidur 30 cost?
Cronidur 30 is a high-cost steel ($$$$), pricier than about 78% 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.
Cronidur 30 — frequently asked
What is Cronidur 30 used for?
Cronidur 30 is typically used for aerospace bearings, marine bearings and high-performance corrosion-resistant bearings. In short: best corrosion resistance among bearing steels; higher RCF life than 440C; low elongation, 250 °C limit.
What is the yield strength of Cronidur 30?
Cronidur 30 has a typical yield strength of 1,850 MPa (268 ksi) and a tensile strength of 2,100 MPa (305 ksi) — stronger than 99% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is Cronidur 30 easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 99% of steel grades). Machine rings and shafts in the annealed state with rigid setups and coated carbide at low speed; after hardening only grinding, honing and CBN hard turning are practical.
Can Cronidur 30 be welded?
Not readily — weldability is rated poor (15/100). Not recommended — high C+N martensite is highly crack sensitive; if unavoidable use electron-beam/laser with preheat and immediate re-heat-treatment.
What surface finishes work on Cronidur 30?
Passivate per ASTM A967 after grinding; superfinish/lap raceways for maximum RCF life; PVD (TiN/DLC) or black oxide can be applied below the tempering temperature.
Can Cronidur 30 be formed, bent or molded?
Hot forge 1100–850 °C with slow controlled cooling and immediate soft anneal; no cold forming in hardened condition.
What is the maximum service temperature of Cronidur 30?
Cronidur 30 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Cronidur 30 H+DF+T180 and Cronidur 30-ANN?
H+DF+T180 is the default condition — standard bearing condition: max hardness and rolling contact fatigue life for service up to ~250 °C. ANN: delivery condition for machining of rings and shafts before hardening. Yield strength is 1,850 MPa in H+DF+T180 versus 600 MPa in ANN.
How much does Cronidur 30 cost?
Cronidur 30 is a high-cost steel ($$$$), pricier than about 78% 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
- Cronidur 30 (X30CrMoN15-1) high-nitrogen stainless steel data sheet — Energietechnik Essen GmbH (2020)
- DIN EN 10088 / Werkstoff X30CrMoN15-1 (1.4108) — DIN/CEN (2014)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Bearing steel rolling contact fatigue and corrosion comparison studies (440C vs high-nitrogen steels) — tribology/bearing literature (2015)
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.