Steel G17Mn5
EN 1.1131
G17Mn5 (1.1131) is a low-carbon manganese cast steel selected for weldability and notch toughness at low temperature, available as F, +N, +NT, +SR and +QT.
Reference datasheet — G17Mn5 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
G17Mn5 tempers and conditions
G17Mn5 is supplied in 5 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Only for non-pressure structural parts; coarse as-cast structure gives low and scattered toughness and is not EN 10213 compliant. | 240 | 470 | 20 | 150 HB | 8.5 % IACS |
Normalized | Simple grain-refining treatment used for non-critical or general engineering castings of this grade. | 255 | 490 | 26 | 145 HB | 8.6 % IACS |
Normalized and tempered | Economical alternative to +QT for thinner walls where -40 °C toughness margin is less critical. | 265 | 500 | 27 | 148 HB | 8.6 % IACS |
Stress relieved | Applied after major weld repair or heavy machining to relieve residual stress; mechanicals close to the prior +QT/+NT state with slightly lower yield. | 270 | 505 | 28 | 150 HB | 8.6 % IACS |
+QTDefault Quenched and tempered | Standard pressure-casting condition: best combination of 240 MPa yield and -40 °C notch toughness. | 280 | 520 | 28 | 155 HB | — |
What is G17Mn5?
G17Mn5 (1.1131) is a low-carbon manganese cast steel selected for weldability and notch toughness at low temperature, available as F, +N, +NT, +SR and +QT. Default-condition properties are 280 MPa yield, 520 MPa tensile, 28% elongation and about 155 HB, with service to 400 °C and a weldability score of 82 (CE ≈ 0.40); typical forms are sand and investment castings for pressure and piping duty. The trade-off is comparatively low strength and a tendency to machine gummy below ~150 HB, plus no inherent corrosion resistance. G24Mn6 is the nearest alternative where higher strength is needed and lower ductility is acceptable. G17Mn5 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F). G17Mn5 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 90% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
What is G17Mn5 used for?
- Pressure vessel castings
- Valve bodies for low-temperature service
- Piping components
Advantages
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Readily welded — 82/100, better than 81% of steel grades
Limitations
- Low strength — 280 MPa (40.6 ksi), worse than 90% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
G17Mn5 properties
Typical room-temperature values for G17Mn5-+QT; bars are the position among steel grades.
Physical3
G17Mn5 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F).
Mechanical15
G17Mn5 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 90% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G17Mn5 is rated for continuous service to 400°C (752 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), better than 75% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical2
G17Mn5 has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of G17Mn5 takes about 24 MJ of energy and emits 2 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 85%.
Manufacturability8
G17Mn5's machinability is good (58/100, better than 75% of steel grades); weldability very good (82/100); formability poor (20/100).
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. G17Mn5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G17Mn5
Is G17Mn5 easy to machine?
Machines like soft C-Mn steel but can be gummy below ~150 HB — use positive-rake carbide, moderate speed and heavy feed to break the chip; watch for hard skin and residual sand on unmachined faces.
Can G17Mn5 be welded?
Excellent weldability (CE ≈ 0.40): SMAW/GTAW/SAW with low-hydrogen consumables, 100–150 °C preheat for heavy sections, PWHT at 550–620 °C for pressure parts and major repairs.
Can G17Mn5 be formed, bent or molded?
Green-sand or no-bake sand casting; needs generous risering and chills due to steel's high shrinkage (~2 %), high pour temperature (~1580–1620 °C) and long solidification range — avoid sharp internal fillets.
G17Mn5 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 |
|---|---|---|
| C0.17 % nominal gives the grade its name | 0.15 – 0.2 | 0.17 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 1 – 1.6 | 1.3 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Crresidual element | ≤ 0.3 | 0.1 |
| Niresidual element | ≤ 0.8 | 0.2 |
| Moresidual element | ≤ 0.12 | 0.03 |
| Curesidual element | ≤ 0.3 | 0.1 |
| Vresidual element | ≤ 0.05 | 0.01 |
| Fe | balance |
What surface finishes work on G17Mn5?
No anodizing; shot blast then epoxy/zinc-rich primer, phosphate, or Ni/Cr plating for corrosion protection; can be nitrided only for light wear duty.
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 G17Mn5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.1131
How much does G17Mn5 cost?
G17Mn5 is a standard-cost steel ($$), cheaper than about 71% 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.
G17Mn5 — frequently asked
What is G17Mn5 used for?
G17Mn5 is typically used for pressure vessel castings, valve bodies for low-temperature service and piping components. In short: best low-temperature toughness; highly weldable cast steel; high ductility, moderate strength.
What is the yield strength of G17Mn5?
G17Mn5 has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 90% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G17Mn5 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like soft C-Mn steel but can be gummy below ~150 HB — use positive-rake carbide, moderate speed and heavy feed to break the chip; watch for hard skin and residual sand on unmachined faces.
Can G17Mn5 be welded?
Yes — weldability is rated very good (82/100). Excellent weldability (CE ≈ 0.40): SMAW/GTAW/SAW with low-hydrogen consumables, 100–150 °C preheat for heavy sections, PWHT at 550–620 °C for pressure parts and major repairs.
What surface finishes work on G17Mn5?
No anodizing; shot blast then epoxy/zinc-rich primer, phosphate, or Ni/Cr plating for corrosion protection; can be nitrided only for light wear duty.
Can G17Mn5 be formed, bent or molded?
Green-sand or no-bake sand casting; needs generous risering and chills due to steel's high shrinkage (~2 %), high pour temperature (~1580–1620 °C) and long solidification range — avoid sharp internal fillets.
What is the maximum service temperature of G17Mn5?
G17Mn5 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 G17Mn5 +QT and G17Mn5-F?
+QT is the default condition — standard pressure-casting condition: best combination of 240 MPa yield and -40 °C notch toughness. F: only for non-pressure structural parts; coarse as-cast structure gives low and scattered toughness and is not EN 10213 compliant. Yield strength is 280 MPa in +QT versus 240 MPa in F.
How much does G17Mn5 cost?
G17Mn5 is a standard-cost steel ($$), cheaper than about 71% 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 10213 — Steel castings for pressure purposes — CEN (2016)
- GB/T 16253 — (pressure-purpose steel castings, ZG20Mn) — SAC (2019)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASTM A352/A216 (equivalent low-temperature / general carbon steel castings) — ASTM (2018)
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.