Steel 28Mn6
EN 28Mn6
28Mn6 (1.1170, 30Mn2) is a non-alloy special steel of about 0.28 % C with raised manganese for deeper hardenability, supplied within the EN 10083 quenched-and-tempered family.
Reference datasheet — 28Mn6 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
28Mn6 tempers and conditions
28Mn6 is supplied in 8 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest supply condition for heavy machining, cold forming or before final heat treatment. | 330 | 580 | 22 | 190 HB | 46 W/m·K |
Normalized and tempered | Normalize plus a stress-relieving temper for dimensionally stable, tough large sections where full quenching is impractical. | 365 | 660 | 19 | 195 HB | — |
Normalized | Uniform fine-grained ferrite/pearlite for weldments and moderate-duty parts that will not be quenched. | 370 | 680 | 18 | 200 HB | — |
+QT | Heavy-forging class; the Mn addition keeps core properties acceptable where plain C45 would fall short. | 380 | 625 | 18 | 185 HB | — |
+QT | Property class for medium-heavy forgings; mass effect lowers strength but toughness stays high. | 430 | 675 | 17 | 15 HRC | — |
+QTDefault Quenched and tempered | Standard commercial condition: best strength/toughness balance for shafts, flanges and forgings of medium section. | 540 | 780 | 16 | 21 HRC | — |
Cold drawn | Cold-drawn bright bar for close-tolerance shafts and automatic-lathe work without further heat treatment. | 560 | 720 | 9 | 215 HB | — |
+QT | Highest strength class of the grade; use for thin bars and small forgings where 800–950 MPa is required. | 620 | 870 | 14 | 26 HRC | — |
What is 28Mn6?
28Mn6 (1.1170, 30Mn2) is a non-alloy special steel of about 0.28 % C with raised manganese for deeper hardenability, supplied within the EN 10083 quenched-and-tempered family. It is chosen for larger forgings and bar parts that must through-harden beyond plain C35E; the default +QT condition gives 540 MPa yield, 780 MPa tensile, 16 % elongation and 235 HB (21 HRC). Section-graded +QT classes (≤16 mm, 40–100 mm, 100–160 mm) plus +A, +N, +NT and +C are on file. Welding needs preheat at CEV ≈ 0.55–0.65 and service is capped near 400 °C; for heavier sections move to 34CrMo4. 28Mn6 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). 28Mn6 has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 70% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 28Mn6 used for?
- crankshafts
- large forgings
- gear blanks
- flanges
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
28Mn6 properties
Typical room-temperature values for 28Mn6-+QT; bars are the position among steel grades.
Physical3
28Mn6 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
28Mn6 has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 70% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
28Mn6 is rated for continuous service to 400°C (752 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), better than 51% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
28Mn6 conducts electricity at 8.5 % IACS, better than 63% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 28Mn6 takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability8
28Mn6's machinability is good (55/100, better than 62% of steel grades); weldability fair (45/100); formability fair (40/100).
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. 28Mn6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 28Mn6
Is 28Mn6 easy to machine?
Machine in +A or +N (≤220 HB) for best tool life; in +QT (~235 HB) use coated carbide, 120–180 m/min, rigid setups and generous coolant.
Can 28Mn6 be welded?
CEV ≈ 0.55–0.65: preheat 150–250 °C, use low-hydrogen consumables and stress-relieve/temper at 550–650 °C after welding.
Can 28Mn6 be formed, bent or molded?
Hot forge 1100–850 °C then normalize; cold bending only in +A/+N condition with generous radii — +QT bar is essentially non-formable.
28Mn6 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 |
|---|---|---|
| CEN 10083-2 heat analysis | 0.25 – 0.32 | 0.28 |
| Si | ≤ 0.4 | 0.25 |
| Mnhardenability booster | 1.3 – 1.65 | 1.45 |
| P | ≤ 0.04 | 0.02 |
| Slower S grades (+S variants) available for cleanliness | ≤ 0.04 | 0.02 |
| Crresidual | ≤ 0.4 | 0.15 |
| Moresidual | ≤ 0.1 | 0.03 |
| Niresidual; Cr+Mo+Ni ≤ 0.63 | ≤ 0.4 | 0.15 |
| Fe | balance |
What surface finishes work on 28Mn6?
No anodizing; protect by painting, phosphating, black oxide, zinc or hard-chrome plating; nitriding or induction hardening can raise surface wear resistance.
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 28Mn6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.1170
- Similar grades
- 30Mn2
How much does 28Mn6 cost?
28Mn6 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
28Mn6 — frequently asked
What is 28Mn6 used for?
28Mn6 is typically used for crankshafts, large forgings, gear blanks and flanges. In short: deeper hardenability than C35E; large-section Q&T forgings; no Cr-Mo alloy content.
What is the yield strength of 28Mn6?
28Mn6 has a typical yield strength of 540 MPa (78.3 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 70% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 28Mn6 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine in +A or +N (≤220 HB) for best tool life; in +QT (~235 HB) use coated carbide, 120–180 m/min, rigid setups and generous coolant.
Can 28Mn6 be welded?
With care — weldability is rated fair (45/100). CEV ≈ 0.55–0.65: preheat 150–250 °C, use low-hydrogen consumables and stress-relieve/temper at 550–650 °C after welding.
What surface finishes work on 28Mn6?
No anodizing; protect by painting, phosphating, black oxide, zinc or hard-chrome plating; nitriding or induction hardening can raise surface wear resistance.
Can 28Mn6 be formed, bent or molded?
Hot forge 1100–850 °C then normalize; cold bending only in +A/+N condition with generous radii — +QT bar is essentially non-formable.
What is the maximum service temperature of 28Mn6?
28Mn6 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 28Mn6 cost?
28Mn6 is a budget-cost steel ($), 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 10083-2 — Steels for quenching and tempering, Part 2: Non-alloy steels — CEN (2006)
- EN 10083-1 — General technical delivery conditions — CEN (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
- GB/T 699 / GB/T 3077 (30Mn2 comparison) — SAC (2015)
- Mysteel / SMM — Mysteel (2025)
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.