Steel 17Mn4 · supply condition · default condition
Steel 17Mn4-HR
Properties of the HR condition, compared with the other 17Mn4 tempers.
Cheapest form for non-code structural or machining stock where certified toughness in the normalized condition is not required.
What is 17Mn4-HR?
17Mn4-HR is 17Mn4 supplied in the HR condition — cheapest form for non-code structural or machining stock where certified toughness in the normalized condition is not required. 17Mn4-HR has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi). 17Mn4-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Advantages
- Easy to machine — 60/100, better than 83% of steel grades
- Readily welded — 85/100, better than 83% of steel grades
- Forms and bends easily — 65/100, better than 81% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 80% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
17Mn4-HR properties
Typical room-temperature values for 17Mn4-HR — 7 properties are specific to this condition; the rest are grade-level values shared by every 17Mn4 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
17Mn4-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical15
17Mn4-HR has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
17Mn4-HR is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
17Mn4-HR conducts electricity at 9 % IACS, better than 70% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 17Mn4-HR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
17Mn4-HR's machinability is good (60/100, better than 83% of steel grades); weldability excellent (85/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 17Mn4 tempers and conditions
17Mn4 is also supplied in 5 other conditions. The full side-by-side table is on the 17Mn4 overview.
- HRDefaultCheapest form for non-code structural or machining stock where certified toughness in the normalized condition is not required.330 MPa yield · 155 HB
- Q&TOnly for small forgings/thin parts where extra yield strength is wanted; low hardenability of 0.17 C–1.2 Mn limits response in thick sections and it is rarely a code delivery condition.450 MPa yield · 15 HRC
- NormalizedPick for boiler drums, steam headers and code-stamped pressure parts — best combination of guaranteed ReH, RT/low-temperature toughness and weldability.325 MPa yield · 150 HB
Working with 17Mn4-HR
Is 17Mn4 easy to machine?
Machines like normalized 1020–1025 steel at ~65 % of AISI 1212; use sharp positive-rake carbide, generous feed and coolant to avoid gummy chips and built-up edge.
Can 17Mn4 be welded?
Readily weldable by SMAW/GMAW/SAW with matching C-Mn consumables; CEV ≈ 0.40 so preheat 100–150 °C above ~30 mm and PWHT 550–620 °C where the pressure code requires it.
Can 17Mn4 be formed, bent or molded?
Good cold bendability in the normalized condition (min bend radius ≈ 2 t); hot form 900–1050 °C and re-normalize afterwards to restore certified properties.
What surface finishes work on 17Mn4?
No anodizing; shot blast then paint, phosphate, hot-dip galvanize or zinc-plate — bare surfaces rust quickly, and boiler internals rely on water chemistry plus corrosion allowance.
17Mn4 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 |
|---|---|---|
| Cladle analysis, EN 10028-2 P295GH | 0.08 – 0.2 | 0.17 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.9 – 1.5 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| S0.010 max for some deliveries | ≤ 0.02 | 0.01 |
| Altotal Al, fully killed / fine grain | ≥ 0.02 | 0.03 |
| Crresidual | ≤ 0.3 | 0.08 |
| Curesidual | ≤ 0.3 | 0.1 |
| Niresidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.08 | 0.02 |
| Nb | ≤ 0.02 | — |
| Ti | ≤ 0.03 | — |
| V | ≤ 0.02 | — |
| N | ≤ 0.01 | — |
| Fe | balance | — |
17Mn4-HR — frequently asked
What is 17Mn4-HR used for?
17Mn4-HR is typically used for welded boiler drums and shells, pressure vessel shells and heads, steam piping and headers, heat exchanger shells, air receivers and tube plates and vessel flanges. In short: workhorse mild-steel plate.
What is the yield strength of 17Mn4-HR?
17Mn4-HR has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 17Mn4-HR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like normalized 1020–1025 steel at ~65 % of AISI 1212; use sharp positive-rake carbide, generous feed and coolant to avoid gummy chips and built-up edge.
Can 17Mn4-HR be welded?
Yes — weldability is rated excellent (85/100). Readily weldable by SMAW/GMAW/SAW with matching C-Mn consumables; CEV ≈ 0.40 so preheat 100–150 °C above ~30 mm and PWHT 550–620 °C where the pressure code requires it.
What surface finishes work on 17Mn4-HR?
No anodizing; shot blast then paint, phosphate, hot-dip galvanize or zinc-plate — bare surfaces rust quickly, and boiler internals rely on water chemistry plus corrosion allowance.
Can 17Mn4-HR be formed, bent or molded?
Good cold bendability in the normalized condition (min bend radius ≈ 2 t); hot form 900–1050 °C and re-normalize afterwards to restore certified properties.
What is the maximum service temperature of 17Mn4-HR?
17Mn4-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 17Mn4-HR and 17Mn4-CD?
HR is the default condition — cheapest form for non-code structural or machining stock where certified toughness in the normalized condition is not required. CD: bar stock for machined fittings and flange blanks — higher yield, better surface and straightness than hot-rolled bar. Yield strength is 330 MPa in HR versus 480 MPa in CD.
Can FabDigit make parts in 17Mn4-HR?
Yes — 17Mn4-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
- DIN 17155 — Plates and strips of steels for pressure purposes (17Mn4) — DIN (1983)
- EN 10028-2 — Flat products of steels for pressure purposes: non-alloy and alloy steels with elevated temperature properties (P295GH, 1.0481) — CEN (2017)
- EN 10027-2 — Designation systems for steels: steel numbers — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- AD 2000-Merkblatt W1 — Flat products of ferritic steels for pressure vessels — Verband der TÜV (2018)
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.