Steel G9Ni10-QT (Quenched and tempered)
Heat-treated state
EN 1.5636
Choose when higher yield strength and finer bainitic structure are needed in thicker sections while keeping low-temperature toughness.
Values for the QT condition
Other G9Ni10 tempers and conditions
G9Ni10 is listed in 5 conditions; see the grade overview at G9Ni10.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Reference condition only — coarse dendritic structure with poor low-temperature toughness; EN 10213 requires heat treatment before delivery. | 290 | 520 | 15 | 155 HB | 8 % IACS |
N+T heavy section | Thick-walled valve bodies and pump casings; slower cooling gives coarser structure and somewhat lower strength/toughness than thin sections. | 300 | 505 | 24 | 150 HB | 8 % IACS |
normalized, tempered and post-weld stress relieved | Condition after production/repair welding and PWHT (typically 580–620 °C); marginally lower yield but restored toughness and low residual stress. | 315 | 525 | 28 | 155 HB | 8 % IACS |
N+TDefault Normalized and tempered | Standard delivery condition of EN 10213 low-temperature castings; best balance of strength, ductility and -70 °C notch toughness. | 330 | 540 | 28 | 160 HB | — |
QTThis page Quenched and tempered | Choose when higher yield strength and finer bainitic structure are needed in thicker sections while keeping low-temperature toughness. | 400 | 590 | 24 | 180 HB | — |
What is G9Ni10-QT?
G9Ni10-QT is G9Ni10 heat treated to QT — choose when higher yield strength and finer bainitic structure are needed in thicker sections while keeping low-temperature toughness. G9Ni10-QT has a yield strength of 400 MPa (58 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 60% of steel grades. Elongation at break is 24% and the elastic modulus is 205 GPa (29.7 Msi). G9Ni10-QT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,440°C (2,624 °F). N+T is the default condition FabDigit quotes; QT is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 135 MPa·√m (122.9 ksi·√in), better than 93% of steel grades
Limitations
- Limited formability — 15/100, worse than 87% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
G9Ni10-QT properties
Typical room-temperature values for G9Ni10-QT; 10 are specific to this condition. Other listed values are G9Ni10 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G9Ni10-QT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,440°C (2,624 °F).
Mechanical16
G9Ni10-QT has a yield strength of 400 MPa (58 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 60% of steel grades. Elongation at break is 24% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
G9Ni10-QT is rated for continuous service to 300°C (572 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
G9Ni10-QT conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of G9Ni10-QT takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 75%.
Manufacturability8
G9Ni10-QT's machinability is fair (50/100, worse than 53% of steel grades); weldability very good (70/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G9Ni10-QT
Is G9Ni10 easy to machine?
Machines like a 2.5 % Ni low-alloy steel at ~60 % of AISI 1212; use rigid setups and carbide tooling, expect abrasive cast skin and occasional sand inclusions on the first cut.
Can G9Ni10 be welded?
Good weldability with low-hydrogen SMAW/GTAW consumables of matching 2–3 % Ni type; preheat ~100–150 °C, interpass control, and PWHT at 580–620 °C for pressure parts.
Can G9Ni10 be formed, bent or molded?
Supplied as sand or investment castings; provide generous fillets and directional solidification with risers, then always normalize+temper (or QT) before use.
What surface finishes work on G9Ni10?
No anodizing; shot blast then epoxy/zinc-rich primer, or zinc/nickel plating — the alloy rusts as readily as carbon steel in humid or marine service.
G9Ni10 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 10213 max | ≤ 0.1 | 0.09 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| NiEN designation factor for Ni is 4 → '10' = 2.5 % Ni | 2 – 3 | 2.5 |
| Crresidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.12 | 0.05 |
| Curesidual | ≤ 0.3 | 0.1 |
| Vresidual | ≤ 0.03 | 0.01 |
| Fe | balance | — |
G9Ni10-QT — frequently asked
What is G9Ni10-QT used for?
G9Ni10-QT is typically used for LNG storage tank fittings, cryogenic valve bodies and low-temperature pressure vessel castings. In short: toughness to −195 °C; cryogenic A352 LC9 casting; weldable nickel cast steel.
What is the yield strength of G9Ni10-QT?
G9Ni10-QT has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 590 MPa (85.6 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G9Ni10-QT easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machines like a 2.5 % Ni low-alloy steel at ~60 % of AISI 1212; use rigid setups and carbide tooling, expect abrasive cast skin and occasional sand inclusions on the first cut.
Can G9Ni10-QT be welded?
Yes — weldability is rated very good (70/100). Good weldability with low-hydrogen SMAW/GTAW consumables of matching 2–3 % Ni type; preheat ~100–150 °C, interpass control, and PWHT at 580–620 °C for pressure parts.
What surface finishes work on G9Ni10-QT?
No anodizing; shot blast then epoxy/zinc-rich primer, or zinc/nickel plating — the alloy rusts as readily as carbon steel in humid or marine service.
Can G9Ni10-QT be formed, bent or molded?
Supplied as sand or investment castings; provide generous fillets and directional solidification with risers, then always normalize+temper (or QT) before use.
What is the maximum service temperature of G9Ni10-QT?
G9Ni10-QT is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between G9Ni10 N+T and G9Ni10-QT?
N+T is the default condition — standard delivery condition of EN 10213 low-temperature castings; best balance of strength, ductility and -70 °C notch toughness. QT: choose when higher yield strength and finer bainitic structure are needed in thicker sections while keeping low-temperature toughness. Yield strength is 330 MPa in N+T versus 400 MPa in QT.
Sources
- EN 10213 — Steel castings for pressure purposes (grade G9Ni10, 1.5636) — CEN (2016)
- ASTM A352/A352M — Steel castings, ferritic and martensitic, for pressure-containing parts for low-temperature service (LC2/LC3/LC9) — ASTM (2018)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
- Stahlschlüssel / Key to Steel — material No. 1.5636 — Verlag Stahlschlüssel Wegst (2019)
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.