Steel 30CrMo · hardness band
Steel 30CrMo Q&T 28-32 HRC
Properties of the Q&T 28-32 HRC condition, compared with the other 30CrMo tempers.
Ordered when drawings call out a hardness band for machinability plus fatigue strength (typical for pinions, couplings, hydraulic bodies).
What is 30CrMo Q&T 28-32 HRC?
30CrMo Q&T 28-32 HRC is 30CrMo heat treated to Q&T 28-32 HRC — ordered when drawings call out a hardness band for machinability plus fatigue strength (typical for pinions, couplings, hydraulic bodies). 30CrMo Q&T 28-32 HRC has a yield strength of 810 MPa (117 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 87% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi). 30CrMo Q&T 28-32 HRC 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). HR is the default condition FabDigit quotes; Q&T 28-32 HRC is available on request or by drawing note.
Advantages
- High strength — 810 MPa (117 ksi), better than 87% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
30CrMo Q&T 28-32 HRC properties
Typical room-temperature values for 30CrMo Q&T 28-32 HRC — 9 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 Q&T 28-32 HRC 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 Q&T 28-32 HRC has a yield strength of 810 MPa (117 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 87% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
30CrMo Q&T 28-32 HRC 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 Q&T 28-32 HRC 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 Q&T 28-32 HRC 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 Q&T 28-32 HRC's machinability is fair (54/100, better than 54% of steel grades); weldability good (60/100); formability fair (45/100).
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 Q&T 28-32 HRC
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 Q&T 28-32 HRC — frequently asked
What is 30CrMo Q&T 28-32 HRC used for?
30CrMo Q&T 28-32 HRC is typically used for shafts, industrial bolts and hydraulic cylinders. In short: workhorse Cr-Mo bar.
What is the yield strength of 30CrMo Q&T 28-32 HRC?
30CrMo Q&T 28-32 HRC has a typical yield strength of 810 MPa (117 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 87% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 30CrMo Q&T 28-32 HRC 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 Q&T 28-32 HRC 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 Q&T 28-32 HRC?
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 Q&T 28-32 HRC 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 Q&T 28-32 HRC?
30CrMo Q&T 28-32 HRC 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 Q&T 28-32 HRC?
Yes — 30CrMo Q&T 28-32 HRC 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.