Steel 30CrMo4
EN 30CrMo4
30CrMo4 (1.7216, AISI 4130) is a general-purpose chromium-molybdenum through-hardening steel; in +QT it provides about 660 MPa yield, 900 MPa tensile, 15 % elongation and 270 HB (28 HRC).
Reference datasheet — 30CrMo4 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
30CrMo4 tempers and conditions
30CrMo4 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 | Spheroidized carbides for maximum cold formability — chosen for cold-headed fasteners and deep cold extrusion. | 370 | 580 | 27 | 10 HRC | 8.2 % IACS |
Treated for shearability | Hardness held low enough for clean cold shearing of bar into blanks before forging or heading. | 380 | 600 | 25 | 11 HRC | 8.2 % IACS |
Annealed | Softest supply condition (≤229 HB) for heavy machining, cold forming or before final quench and temper. | 400 | 620 | 24 | 190 HB | — |
Hot rolled | Cheapest mill condition for parts that will be heat treated by the customer after rough machining. | 440 | 700 | 19 | 18 HRC | 8 % IACS |
Normalized | Uniform fine ferrite-pearlite structure for forgings and weldments where full Q&T strength is not required. | 460 | 720 | 20 | 215 HB | — |
+QT | Large-diameter bar and forgings where limited hardenability reduces core properties to ~700–850 MPa. | 500 | 780 | 17 | 22 HRC | — |
Cold drawn | Bright, close-tolerance bar for automatic machining; higher yield but reduced ductility and residual stress. | 620 | 750 | 12 | 230 HB | — |
+QTDefault Quenched and tempered | Standard stocked condition: best balance of ~900 MPa strength, toughness and machinability for shafts and machine parts. | 660 | 900 | 15 | 28 HRC | — |
+QT | Thin sections that through-harden fully, giving 900–1100 MPa tensile with ≥700 MPa yield. | 780 | 1,000 | 13 | 31 HRC | — |
+QT to 28–32 HRC | Specified for oilfield/pressure and sour-service style parts where a hardness ceiling is contractually required. | 780 | 950 | 16 | 30 HRC | — |
What is 30CrMo4?
30CrMo4 (1.7216, AISI 4130) is a general-purpose chromium-molybdenum through-hardening steel; in +QT it provides about 660 MPa yield, 900 MPa tensile, 15 % elongation and 270 HB (28 HRC). Lower carbon than 42CrMo4 gives usable weldability (score 60) together with fair machinability (score 50), which is why it is common in welded tubular structures, pressure parts and medium-strength shafts; forms include seamless tube, bar, plate and forgings. Service is limited to about 350 °C, cold formability is moderate (score 35) and the bare surface has no corrosion resistance. For higher strength in thick sections use 34CrMo4 or 42CrMo4. 30CrMo4 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 30CrMo4 has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 80% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
What is 30CrMo4 used for?
- Shafts
- Bolts
- Gears
- Structural components
Advantages
- High strength — 660 MPa (95.7 ksi), better than 80% of steel grades
30CrMo4 properties
Typical room-temperature values for 30CrMo4-+QT; bars are the position among steel grades.
Physical3
30CrMo4 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
30CrMo4 has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 80% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
30CrMo4 is rated for continuous service to 350°C (662 °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
30CrMo4 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 30CrMo4 takes about 29 MJ of energy and emits 2.3 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 25%.
Manufacturability8
30CrMo4's machinability is fair (50/100, worse than 53% of steel grades); weldability good (60/100); 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. 30CrMo4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 30CrMo4
Is 30CrMo4 easy to machine?
Machines predictably in +A or +QT up to ~30 HRC with carbide tooling and rigid setups; expect ~55 % of 1212 rates and use positive rake plus good coolant to avoid work-hardened surfaces.
Can 30CrMo4 be welded?
Weldable by TIG/MIG with ER80S-D2 or matching Cr-Mo filler; preheat 150–250 °C for thick sections, keep interpass control and stress-relieve or re-heat-treat afterwards to avoid HAZ martensite cracking.
Can 30CrMo4 be formed, bent or molded?
Cold form only in +A/+AC condition with generous bend radii; hot forge 1100–850 °C and always normalize or re-quench and temper after hot work.
30CrMo4 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 | 0.26 – 0.34 | 0.3 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.4 – 0.7 | 0.6 |
| P | ≤ 0.03 | 0.02 |
| Smax; ≤0.035 for standard, lower for +S grades | ≤ 0.04 | 0.02 |
| Cr | 0.9 – 1.2 | 1.05 |
| Mo | 0.15 – 0.3 | 0.22 |
| Fe | balance |
What surface finishes work on 30CrMo4?
No corrosion resistance bare — use zinc or cadmium plating, black oxide, manganese phosphate, nitriding or paint; nitriding gives a hard wear surface without losing core Q&T properties.
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 30CrMo4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does 30CrMo4 cost?
30CrMo4 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
30CrMo4 — frequently asked
What is 30CrMo4 used for?
30CrMo4 is typically used for shafts, bolts, gears and structural components. In short: weldable Cr-Mo steel; 4130 tube frame grade; balanced strength and weldability.
What is the yield strength of 30CrMo4?
30CrMo4 has a typical yield strength of 660 MPa (95.7 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 80% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 30CrMo4 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machines predictably in +A or +QT up to ~30 HRC with carbide tooling and rigid setups; expect ~55 % of 1212 rates and use positive rake plus good coolant to avoid work-hardened surfaces.
Can 30CrMo4 be welded?
Yes — weldability is rated good (60/100). Weldable by TIG/MIG with ER80S-D2 or matching Cr-Mo filler; preheat 150–250 °C for thick sections, keep interpass control and stress-relieve or re-heat-treat afterwards to avoid HAZ martensite cracking.
What surface finishes work on 30CrMo4?
No corrosion resistance bare — use zinc or cadmium plating, black oxide, manganese phosphate, nitriding or paint; nitriding gives a hard wear surface without losing core Q&T properties.
Can 30CrMo4 be formed, bent or molded?
Cold form only in +A/+AC condition with generous bend radii; hot forge 1100–850 °C and always normalize or re-quench and temper after hot work.
What is the maximum service temperature of 30CrMo4?
30CrMo4 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 30CrMo4 cost?
30CrMo4 is a budget-cost steel ($), 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 10277 / EN 10278 Bright steel products (cold drawn +C) — CEN (2018)
- GB/T 3077 (30CrMo) — SAC (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 19 — Fatigue and Fracture — ASM International (1996)
- MMPDS-17 (AISI 4130 mechanical property tables) — Battelle/FAA (2022)
- 1.7216 / 30CrMo4 alloy steel datasheet — European long-products mills (e.g. Lucchini/Ovako-type) (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.