Steel G28Mn6 +QT2
Heat-treated state
EN 1.1165
+QT2 = quenched and tempered, higher strength class
Highest-strength delivery condition for wear-loaded, impact-loaded castings (sprockets, links, crusher parts) where ductility can be traded for strength.
Values for the +QT2 condition
Other G28Mn6 tempers and conditions
G28Mn6 is listed in 3 conditions; see the grade overview at G28Mn6.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+NDefault Normalized | Standard, lowest-cost delivery condition for heavy structural and railway castings where 300 MPa yield and good weldability are sufficient. | 340 | 620 | 20 | 180 HB | — |
Quenched and tempered, lower strength class | Pick when higher yield strength and low-temperature toughness are needed but the casting still has to be welded and machined. | 490 | 720 | 17 | 19 HRC | — |
+QT2This page Quenched and tempered, higher strength class | Highest-strength delivery condition for wear-loaded, impact-loaded castings (sprockets, links, crusher parts) where ductility can be traded for strength. | 600 | 820 | 13 | 25 HRC | — |
What is G28Mn6 +QT2?
G28Mn6 +QT2 is G28Mn6 heat treated to +QT2 — highest-strength delivery condition for wear-loaded, impact-loaded castings (sprockets, links, crusher parts) where ductility can be traded for strength. G28Mn6 +QT2 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Elongation at break is 13% and the elastic modulus is 210 GPa (30.5 Msi). G28Mn6 +QT2 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,425°C (2,597 °F). +N is the default condition FabDigit quotes; +QT2 is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- High strength — 600 MPa (87 ksi), better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Limited ductility — 13%, worse than 78% of steel grades
G28Mn6 +QT2 properties
Typical room-temperature values for G28Mn6 +QT2; 17 are specific to this condition. Other listed values are G28Mn6 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G28Mn6 +QT2 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
G28Mn6 +QT2 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Elongation at break is 13% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G28Mn6 +QT2 is rated for continuous service to 380°C (716 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G28Mn6 +QT2 conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of G28Mn6 +QT2 takes about 24 MJ of energy and emits 1.9 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 85%.
Manufacturability8
G28Mn6 +QT2's machinability is fair (42/100, worse than 73% of steel grades); weldability fair (42/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G28Mn6 +QT2
Is G28Mn6 easy to machine?
Machines like a 1330/30Mn wrought steel — carbide tools, 100–150 m/min in +N, reduce ~30 % in +QT2; remove the cast skin with a heavy first cut to avoid sand/oxide tool wear.
Can G28Mn6 be welded?
Weldable with low-hydrogen SMAW/FCAW or MAG using E7018-type consumables, but CE ≈ 0.55 demands 150–250 °C preheat/interpass and PWHT at 580–620 °C for thick sections.
Can G28Mn6 be formed, bent or molded?
Supplied as sand or investment castings; feed heavy sections with risers and chills, normalize at 880–920 °C or quench from 870–900 °C and temper 550–680 °C to the required QT class.
What surface finishes work on G28Mn6?
Shot-blast, then phosphate + primer, zinc-rich or hot-dip galvanizing for outdoor use; flame or induction hardening is possible on wear faces up to ~50 HRC.
G28Mn6 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 10293 ladle analysis | 0.25 – 0.32 | 0.28 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 1.2 – 1.6 | 1.4 |
| P | ≤ 0.02 | 0.01 |
| Ssome standards allow 0.020 | ≤ 0.02 | 0.01 |
| Crresidual | ≤ 0.3 | 0.15 |
| Moresidual | ≤ 0.12 | 0.05 |
| Niresidual | ≤ 0.4 | 0.2 |
| Curesidual | ≤ 0.3 | 0.15 |
| Vresidual | ≤ 0.05 | 0.02 |
| Fe | balance | — |
G28Mn6 +QT2 — frequently asked
What is G28Mn6 +QT2 used for?
G28Mn6 +QT2 is typically used for railway wheels and couplers, heavy structural castings and impact-resistant machine parts. In short: wear-resistant Mn cast steel; impact-duty railway grade; lower weldability than G24Mn6.
What is the yield strength of G28Mn6 +QT2?
G28Mn6 +QT2 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G28Mn6 +QT2 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% of steel grades). Machines like a 1330/30Mn wrought steel — carbide tools, 100–150 m/min in +N, reduce ~30 % in +QT2; remove the cast skin with a heavy first cut to avoid sand/oxide tool wear.
Can G28Mn6 +QT2 be welded?
With care — weldability is rated fair (42/100). Weldable with low-hydrogen SMAW/FCAW or MAG using E7018-type consumables, but CE ≈ 0.55 demands 150–250 °C preheat/interpass and PWHT at 580–620 °C for thick sections.
What surface finishes work on G28Mn6 +QT2?
Shot-blast, then phosphate + primer, zinc-rich or hot-dip galvanizing for outdoor use; flame or induction hardening is possible on wear faces up to ~50 HRC.
Can G28Mn6 +QT2 be formed, bent or molded?
Supplied as sand or investment castings; feed heavy sections with risers and chills, normalize at 880–920 °C or quench from 870–900 °C and temper 550–680 °C to the required QT class.
What is the maximum service temperature of G28Mn6 +QT2?
G28Mn6 +QT2 is rated for continuous use to about 380°C (716 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10027-2 — Material number 1.1165 — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- EN 1011-2 — Welding recommendations for ferritic steels — CEN (2001)
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.