Steel 35NiCrMo16
EN 35NiCrMo16
35NiCrMo16 is a high-strength Ni-Cr-Mo through-hardening alloy steel (1.6773, also designated 36NiCrMo16) with deep hardenability in heavy sections.
Reference datasheet — 35NiCrMo16 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 +QT-1250 condition
35NiCrMo16 tempers and conditions
35NiCrMo16 is supplied in 7 conditions, soft to hard. +QT-1250 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for rough machining, deep hole drilling or cold straightening before final Q&T. | 620 | 900 | 16 | 26 HRC | — |
Normalized | Intermediate stock condition for forgings before final quench and temper; not a service condition. | 800 | 1,150 | 13 | 36 HRC | 5.9 % IACS |
+QT 1100–1300 MPa | Standard EN 10083-3 condition for large-diameter bars and forgings where toughness is prioritised over peak strength. | 950 | 1,200 | 13 | 38 HRC | — |
Q&T + gas/plasma nitrided | Choose when a wear-resistant, fatigue-strengthened surface is needed on an already tough Q&T core (gears, spindles, pins). | 1,100 | 1,300 | 10 | 60 HRC | — |
+QT-1250Default +QT 1250–1450 MPa | Default stocked condition: best balance of ~1350 MPa strength with 40+ J Charpy for shafts, gears and highly loaded fasteners. | 1,150 | 1,350 | 11 | 43 HRC | — |
Q&T 1600–1800 MPa | Use for landing-gear and highly stressed aerospace parts where 1700 MPa is required; demands strict hydrogen and notch control. | 1,500 | 1,700 | 9 | 50 HRC | — |
Q&T 1800–2000 MPa | Only for compression-dominated or strength-critical parts; toughness and hydrogen-embrittlement resistance are at their lowest. | 1,650 | 1,900 | 7 | 54 HRC | — |
What is 35NiCrMo16?
35NiCrMo16 is a high-strength Ni-Cr-Mo through-hardening alloy steel (1.6773, also designated 36NiCrMo16) with deep hardenability in heavy sections. It is specified for heavily loaded aerospace and gear parts and supplied as bar and forging stock in conditions from +A and +N up to QT-1850 and +QT+Nitrided; the default quenched-and-tempered state gives 1150 MPa yield, 1350 MPa tensile, 11 % elongation and 400 HB (43 HRC). Limits are poor weldability, no inherent corrosion resistance, low machinability (rated 28) and a 400 °C maximum service temperature. AISI 4340 is the nearest, more widely stocked alternative. 35NiCrMo16 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). 35NiCrMo16 has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Elongation at break is 11% and the elastic modulus is 205 GPa (29.7 Msi).
What is 35NiCrMo16 used for?
- landing gear
- high-strength bolts
- large gears
- shafts
Advantages
- High strength — 1,150 MPa (167 ksi), better than 94% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- Limited formability — 12/100, worse than 92% of steel grades
- Difficult to machine — 28/100, worse than 91% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Limited ductility — 11%, worse than 89% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
35NiCrMo16 properties
Typical room-temperature values for 35NiCrMo16-+QT-1250; bars are the position among steel grades.
Physical3
35NiCrMo16 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
35NiCrMo16 has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Elongation at break is 11% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
35NiCrMo16 is rated for continuous service to 400°C (752 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical2
35NiCrMo16 has an electrical resistivity of 3×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 35NiCrMo16 takes about 34 MJ of energy and emits 2.4 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
35NiCrMo16's machinability is poor (28/100, worse than 91% of steel grades); weldability poor (15/100); formability not recommended (12/100).
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. 35NiCrMo16 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 35NiCrMo16
Is 35NiCrMo16 easy to machine?
Rough-machine in the +A condition (≈265 HB); in the Q&T state above 40 HRC use rigid setups, coated carbide or CBN at low feeds, and finish-grind close-tolerance features.
Can 35NiCrMo16 be welded?
Poor weldability due to high carbon equivalent — if unavoidable, preheat 250–350 °C, use low-hydrogen filler, maintain interpass temperature and re-temper below the last tempering temperature immediately after welding.
Can 35NiCrMo16 be formed, bent or molded?
Hot forge 1100–850 °C with slow post-forge cooling to avoid quench cracks; cold forming limited to mild straightening in the annealed state.
35NiCrMo16 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 |
|---|---|---|
| CAFNOR NF A35-565 / EN 10083-3 | 0.32 – 0.39 | 0.35 |
| Si | ≤ 0.35 | 0.25 |
| Mn | 0.3 – 0.6 | 0.45 |
| Paerospace melts typically ≤0.015 | ≤ 0.03 | 0.01 |
| S≤0.010 for aerospace | ≤ 0.02 | 0.01 |
| Cr | 1.6 – 2 | 1.8 |
| Mo | 0.25 – 0.45 | 0.35 |
| Nigives very deep hardenability and low-temperature toughness | 3.6 – 4.1 | 3.85 |
| Fe | balance |
What surface finishes work on 35NiCrMo16?
No anodizing; protect with Zn-Ni or cadmium plating, hard chrome, phosphate+oil or primer/paint, and bake at 190–200 °C after plating to relieve hydrogen; nitriding or shot peening boosts fatigue life.
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 35NiCrMo16 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.677336NiCrMo16
How much does 35NiCrMo16 cost?
35NiCrMo16 is a premium-cost steel ($$$), cheaper than about 51% 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.
35NiCrMo16 — frequently asked
What is 35NiCrMo16 used for?
35NiCrMo16 is typically used for landing gear, high-strength bolts, large gears and shafts. In short: deep-hardening Ni-Cr-Mo steel; tempers to 1850 MPa; poor weldability, low machinability.
What is the yield strength of 35NiCrMo16?
35NiCrMo16 has a typical yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 94% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 35NiCrMo16 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% of steel grades). Rough-machine in the +A condition (≈265 HB); in the Q&T state above 40 HRC use rigid setups, coated carbide or CBN at low feeds, and finish-grind close-tolerance features.
Can 35NiCrMo16 be welded?
Not readily — weldability is rated poor (15/100). Poor weldability due to high carbon equivalent — if unavoidable, preheat 250–350 °C, use low-hydrogen filler, maintain interpass temperature and re-temper below the last tempering temperature immediately after welding.
What surface finishes work on 35NiCrMo16?
No anodizing; protect with Zn-Ni or cadmium plating, hard chrome, phosphate+oil or primer/paint, and bake at 190–200 °C after plating to relieve hydrogen; nitriding or shot peening boosts fatigue life.
Can 35NiCrMo16 be formed, bent or molded?
Hot forge 1100–850 °C with slow post-forge cooling to avoid quench cracks; cold forming limited to mild straightening in the annealed state.
What is the maximum service temperature of 35NiCrMo16?
35NiCrMo16 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 35NiCrMo16 +QT-1250 and 35NiCrMo16 QT-1850?
+QT-1250 is the default condition — default stocked condition: best balance of ~1350 MPa strength with 40+ J Charpy for shafts, gears and highly loaded fasteners. QT-1850: only for compression-dominated or strength-critical parts; toughness and hydrogen-embrittlement resistance are at their lowest. Yield strength is 1,150 MPa in +QT-1250 versus 1,650 MPa in QT-1850.
How much does 35NiCrMo16 cost?
35NiCrMo16 is a premium-cost steel ($$$), cheaper than about 51% 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 10083-3 Steels for quenching and tempering — Part 3: Alloy steels (36NiCrMo16 / 1.6773) — CEN (2006)
- NF A35-565 Aciers alliés de traitement thermique (35NiCrMo16) — AFNOR (1985)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- Stahlschlüssel (Key to Steel), entry 1.6773 — Verlag Stahlschlüssel Wegst (2019)
- High-strength Ni-Cr-Mo aerospace bar (36NiCrMo16) datasheet — Aubert & Duval / Lucchini / Böhler (2022)
- MMPDS-17 (comparative 4340/300M-class strength-toughness data) — Battelle/FAA (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.