Steel 37Mo2
EN 37Mo2
37Mo2 (1.5418) is a medium-carbon molybdenum alloy steel from the EN 10083 quenched-and-tempered family, offered +AR, +A, +AC, +FP, +N, +QT, +QT900, +H, +C and +QT+IH.
Reference datasheet — 37Mo2 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 condition
37Mo2 tempers and conditions
37Mo2 is supplied in 10 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Pick when the part is cold formed, cold extruded or heavily turned/threaded before hardening — softest and most ductile condition. | 300 | 520 | 26 | 155 HB | — |
Annealed | Choose for lowest hardness before heavy machining or as delivery condition for later hardening. | 320 | 560 | 22 | 165 HB | — |
Treated to ferrite–pearlite structure / hardness range | Use when a uniform, predictable machining structure and hardness band is specified for automated turning lines. | 350 | 600 | 20 | 10 HRC | 8.3 % IACS |
Normalized | Refines grain and homogenizes forged or hot-rolled stock; good baseline for medium-duty shafts not requiring full Q&T. | 375 | 630 | 20 | 185 HB | — |
Hot rolled | Cheapest stock form for parts that will be fully heat treated after rough machining. | 380 | 650 | 18 | 12 HRC | 8 % IACS |
+QTDefault Quenched and tempered | Standard stocked condition for finished shafts, gear blanks and pins — balanced strength and toughness. | 550 | 800 | 15 | 22 HRC | — |
+QT + induction hardened surface | Select for shaft journals, splines and gear teeth needing a hard wear surface on a tough Q&T core. | 550 | 800 | 13 | 54 HRC | — |
Cold drawn | Use for close-tolerance bright bar where the part is finished without further heat treatment. | 590 | 700 | 10 | 17 HRC | 7.9 % IACS |
+QT | Low-temperature temper for small-diameter, highly loaded shafts and pins where toughness demands are moderate. | 720 | 970 | 12 | 31 HRC | — |
Hardened | Order +H when a Jominy hardenability band is contractually required, or for the as-quenched martensitic state prior to tempering. | 1,300 | 1,700 | 3 | 52 HRC | — |
What is 37Mo2?
37Mo2 (1.5418) is a medium-carbon molybdenum alloy steel from the EN 10083 quenched-and-tempered family, offered +AR, +A, +AC, +FP, +N, +QT, +QT900, +H, +C and +QT+IH. In the +QT default condition it reaches 550 MPa yield, 800 MPa tensile, 15% elongation and 235 HB (22 HRC) with service to 400 °C, which suits shafts, axles and gear blanks in bar and forged form. Machinability is moderate (52/100) and weldability is limited (42/100) because 0.37 %C plus Mo demands preheat and post-weld tempering; there is no corrosion resistance. 42CrMo4 is the usual alternative when deeper hardenability is needed. 37Mo2 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). 37Mo2 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 71% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
What is 37Mo2 used for?
- shafts
- axles
- gears
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Low fracture toughness — 65 MPa·√m (59.2 ksi·√in), worse than 75% of steel grades
37Mo2 properties
Typical room-temperature values for 37Mo2-+QT; bars are the position among steel grades.
Physical3
37Mo2 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
37Mo2 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 71% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
37Mo2 is rated for continuous service to 400°C (752 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
37Mo2 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 37Mo2 takes about 27 MJ of energy and emits 1.9 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 30%.
Manufacturability7
37Mo2's machinability is fair (52/100, better than 52% of steel grades); weldability fair (42/100); formability fair (38/100).
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. 37Mo2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 37Mo2
Is 37Mo2 easy to machine?
Machine in +A/+AC or +FP (150–185 HB) with carbide tooling; at 235 HB (+QT) reduce speed ~25 % and use rigid setups; grind after hardening.
Can 37Mo2 be welded?
Weldable with low-hydrogen consumables but Mo + 0.37 C means preheat 200–300 °C, control interpass and stress-relieve/temper 550–650 °C after welding.
Can 37Mo2 be formed, bent or molded?
Cold form only in the spheroidize-annealed (+AC) condition; otherwise hot forge 1100–850 °C followed by normalizing or Q&T.
37Mo2 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 |
|---|---|---|
| Cdesignation 37 = ~0.37 % C | 0.32 – 0.42 | 0.37 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.04 | |
| Smax; lower for +QT quality grades | ≤ 0.04 | |
| MoMo2 = ~0.25 % Mo | 0.2 – 0.3 | 0.25 |
| Crresidual | ≤ 0.3 | |
| Niresidual | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on 37Mo2?
No natural corrosion resistance — apply phosphate + oil, zinc or hard chrome plating, black oxide or paint; nitriding gives a wear surface without distortion.
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 37Mo2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.5418
How much does 37Mo2 cost?
37Mo2 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
37Mo2 — frequently asked
What is 37Mo2 used for?
37Mo2 is typically used for shafts, axles and gears. In short: moderate-strength Mo shaft steel; limited weldability, preheat required; suits induction hardening.
What is the yield strength of 37Mo2?
37Mo2 has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 71% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 37Mo2 easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Machine in +A/+AC or +FP (150–185 HB) with carbide tooling; at 235 HB (+QT) reduce speed ~25 % and use rigid setups; grind after hardening.
Can 37Mo2 be welded?
With care — weldability is rated fair (42/100). Weldable with low-hydrogen consumables but Mo + 0.37 C means preheat 200–300 °C, control interpass and stress-relieve/temper 550–650 °C after welding.
What surface finishes work on 37Mo2?
No natural corrosion resistance — apply phosphate + oil, zinc or hard chrome plating, black oxide or paint; nitriding gives a wear surface without distortion.
Can 37Mo2 be formed, bent or molded?
Cold form only in the spheroidize-annealed (+AC) condition; otherwise hot forge 1100–850 °C followed by normalizing or Q&T.
What is the maximum service temperature of 37Mo2?
37Mo2 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 37Mo2 cost?
37Mo2 is a budget-cost steel ($), 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
- EN 10083-3 Steels for quenching and tempering — alloy steels — CEN (2006)
- EN 10084 Case hardening steels — technical delivery conditions (delivery states +A, +AC, +FP, +TH) — CEN (2008)
- EN 10027-2 Designation systems for steels — steel numbers (1.5418) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating — ASM International (1991)
- Stahlschlüssel (Key to Steel) — Mo alloy structural steels — Verlag Stahlschlüssel Wegst (2019)
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.