Steel 30CrMo · supply condition · default condition
Steel 30CrMo-HR
Properties of the HR condition, compared with the other 30CrMo tempers.
Most stocked mill condition for bar and plate; buy when you will machine and then heat treat the part yourself.
What is 30CrMo-HR?
30CrMo-HR is 30CrMo supplied in the HR condition — most stocked mill condition for bar and plate; buy when you will machine and then heat treat the part yourself. 30CrMo-HR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 63% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi). 30CrMo-HR 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).
Advantages
- Polishes to a fine finish — 65/100, better than 78% of steel grades
30CrMo-HR properties
Typical room-temperature values for 30CrMo-HR — 11 properties are specific to this condition; the rest are grade-level values shared by every 30CrMo temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
30CrMo-HR 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).
Mechanical13
30CrMo-HR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 63% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
30CrMo-HR 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
30CrMo-HR conducts electricity at 7.8 % IACS, worse than 58% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 30CrMo-HR takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 55% of steel grades. Typical recycled content is 30%.
Manufacturability7
30CrMo-HR's machinability is fair (54/100, better than 54% of steel grades); weldability good (60/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 30CrMo tempers and conditions
30CrMo is also supplied in 7 other conditions. The full side-by-side table is on the 30CrMo overview.
- HRDefaultMost stocked mill condition for bar and plate; buy when you will machine and then heat treat the part yourself.500 MPa yield · 215 HB
- Q&TStandard high-strength delivery condition for shafts, bolts and pressure parts; ~930 MPa minimum UTS with high toughness.850 MPa yield · 31 HRC
- Q&T 28-32 HRCOrdered when drawings call out a hardness band for machinability plus fatigue strength (typical for pinions, couplings, hydraulic bodies).810 MPa yield · 30 HRC
- CDChoose for close-tolerance, good-surface bar used as-is in shafts and studs without further heat treatment.660 MPa yield · 235 HB
- CRThin-gauge strip and sheet for stamped or roll-formed parts that will be quenched and tempered after forming.570 MPa yield · 225 HB
- NormalizedUniform fine-grain structure with mid-range strength; used for weld fabrications and as a pre-treatment before Q&T.570 MPa yield · 22 HRC
- N&TPick for large sections or welded assemblies where full quench hardening is impractical but stress-free mid strength is wanted.520 MPa yield · 220 HB
- AnnealedSoftest and most machinable/formable state; choose for deep machining, cold forming or before final quench and temper.390 MPa yield · 185 HB
Working with 30CrMo-HR
Is 30CrMo easy to machine?
Machine in the annealed or 28–32 HRC condition with carbide inserts, ~60 % of 1212 rates; above 34 HRC expect rapid tool wear and prefer grinding.
Can 30CrMo be welded?
Weldable by TIG/MIG/SMAW with ER80S-D2/E8018-B2 filler; preheat 150–250 °C and temper/stress relieve at 600–650 °C to avoid hydrogen and quench cracks.
Can 30CrMo be formed, bent or molded?
Hot forge 1150–850 °C then normalize; cold bending only in the annealed state with generous radii.
What surface finishes work on 30CrMo?
No natural corrosion protection — use phosphate + oil, black oxide, zinc or hard-chrome plating, or paint; polishes and nitrides well after Q&T.
30CrMo 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 |
|---|---|---|
| CGB/T 3077-2015 | 0.26 – 0.34 | 0.3 |
| Si | 0.17 – 0.37 | 0.27 |
| Mn | 0.4 – 0.7 | 0.55 |
| Cr | 0.8 – 1.1 | 0.95 |
| Mo | 0.15 – 0.25 | 0.2 |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.25 | — |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
30CrMo-HR — frequently asked
What is 30CrMo-HR used for?
30CrMo-HR is typically used for shafts, industrial bolts and hydraulic cylinders. In short: workhorse Cr-Mo bar.
What is the yield strength of 30CrMo-HR?
30CrMo-HR has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 63% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 30CrMo-HR easy to machine?
Reasonably — machinability is rated fair (54/100, better than 54% of steel grades). Machine in the annealed or 28–32 HRC condition with carbide inserts, ~60 % of 1212 rates; above 34 HRC expect rapid tool wear and prefer grinding.
Can 30CrMo-HR be welded?
Yes — weldability is rated good (60/100). Weldable by TIG/MIG/SMAW with ER80S-D2/E8018-B2 filler; preheat 150–250 °C and temper/stress relieve at 600–650 °C to avoid hydrogen and quench cracks.
What surface finishes work on 30CrMo-HR?
No natural corrosion protection — use phosphate + oil, black oxide, zinc or hard-chrome plating, or paint; polishes and nitrides well after Q&T.
Can 30CrMo-HR be formed, bent or molded?
Hot forge 1150–850 °C then normalize; cold bending only in the annealed state with generous radii.
What is the maximum service temperature of 30CrMo-HR?
30CrMo-HR 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 30CrMo-HR and 30CrMo-CD?
HR is the default condition — most stocked mill condition for bar and plate; buy when you will machine and then heat treat the part yourself. CD: choose for close-tolerance, good-surface bar used as-is in shafts and studs without further heat treatment. Yield strength is 500 MPa in HR versus 660 MPa in CD.
Can FabDigit make parts in 30CrMo-HR?
Yes — 30CrMo-HR is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10083-3 Steels for quenching and tempering (25CrMo4 / 1.7218) — CEN (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Machinery's Handbook, 31st ed. (machinability and heat-treat data) — Industrial Press (2020)
- 1.7218 / 25CrMo4 alloy steel datasheet — Böhler / Lucefin group data (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.