Steel G9Ni14
EN 1.5638
G9Ni14 (EN 1.5638) is a higher-nickel low-temperature cast steel, roughly 13–14 % Ni, supplied quenched and tempered or normalized and tempered for cryogenic pressure service.
Reference datasheet — G9Ni14 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
G9Ni14 tempers and conditions
G9Ni14 is supplied in 3 conditions, soft to hard. QT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
QT heavy section | Same heat treatment on heavy-wall castings; reduced cooling rate lowers guaranteed yield strength and mid-wall toughness. | 370 | 530 | 24 | 165 HB | 6.2 % IACS |
Double) normalized and tempered | Alternative EN 10213 route for large or complex castings where quenching risks distortion/cracking; slightly lower strength, similar low-temperature toughness. | 385 | 540 | 26 | 168 HB | 6.2 % IACS |
QTDefault Quenched and tempered | Standard delivery condition for EN 10213 low-temperature valve and pump castings needing −100 °C toughness with Rp0.2 ≥ 360 MPa. | 400 | 560 | 25 | 175 HB | 5.8 % IACS |
What is G9Ni14?
G9Ni14 (EN 1.5638) is a higher-nickel low-temperature cast steel, roughly 13–14 % Ni, supplied quenched and tempered or normalized and tempered for cryogenic pressure service. It carries more strength than G9Ni10 — 400 MPa yield, 560 MPa tensile and 25 % elongation at about 175 HB — with improved toughness at very low service temperatures, in sand or investment castings. Machinability is moderate (score 55) and maximum service temperature is about 300 °C. The steel has no inherent corrosion resistance and costs more than plain carbon-manganese cast steel, so it is used only where low-temperature toughness governs. G9Ni14 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). G9Ni14 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of steel grades. Elongation at break is 25% and the elastic modulus is 204 GPa (29.6 Msi).
What is G9Ni14 used for?
- cryogenic vessel castings
- LNG equipment components
- low-temperature valve and pump housings
Advantages
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Poor heat conductor — 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades
- Low electrical conductivity — 5.8 % IACS, worse than 79% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
G9Ni14 properties
Typical room-temperature values for G9Ni14-QT; bars are the position among steel grades.
Physical3
G9Ni14 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
G9Ni14 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of steel grades. Elongation at break is 25% and the elastic modulus is 204 GPa (29.6 Msi).
Thermal6
G9Ni14 is rated for continuous service to 300°C (572 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
G9Ni14 conducts electricity at 5.8 % IACS, worse than 79% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of G9Ni14 takes about 31 MJ of energy and emits 2.4 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 75%.
Manufacturability8
G9Ni14's machinability is good (55/100, better than 62% of steel grades); weldability good (65/100); formability poor (25/100).
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. G9Ni14 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G9Ni14
Is G9Ni14 easy to machine?
Machines like a Q&T low-alloy steel at ~170 HB — sharp carbide inserts, moderate speed, rigid setup; watch for skin scale and casting hard spots.
Can G9Ni14 be welded?
Weldable with low-hydrogen SMAW/GTAW using matching 3.5Ni or Ni-base consumables, preheat 100–150 °C, interpass control and PWHT ~580–620 °C; avoid high heat input to protect −100 °C toughness.
Can G9Ni14 be formed, bent or molded?
Supplied as sand or investment castings; needs generous risering (high solidification shrinkage) and full quench-and-temper of the finished shape — cold forming is not a normal route.
G9Ni14 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 |
|---|---|---|
| Clow carbon for toughness and weldability | ≤ 0.1 | 0.08 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| NiEN designation Ni14 = 14/4 ≈ 3.5 % Ni | 3 – 4 | 3.5 |
| Crresidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.2 | 0.05 |
| Curesidual | ≤ 0.3 | 0.1 |
| Vresidual | ≤ 0.05 | 0.01 |
| Fe | balance |
What surface finishes work on G9Ni14?
Not anodizable; protect with shot blast plus epoxy/zinc-rich paint, or electroless nickel/plating for wet or outdoor service; machined sealing faces polish well.
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 G9Ni14 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.5638
How much does G9Ni14 cost?
G9Ni14 is a premium-cost steel ($$$), cheaper than about 51% 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.
G9Ni14 — frequently asked
What is G9Ni14 used for?
G9Ni14 is typically used for cryogenic vessel castings, LNG equipment components and low-temperature valve and pump housings. In short: higher nickel than G9Ni10; 400 MPa cryogenic yield; cryogenic vessel casting grade.
What is the yield strength of G9Ni14?
G9Ni14 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G9Ni14 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like a Q&T low-alloy steel at ~170 HB — sharp carbide inserts, moderate speed, rigid setup; watch for skin scale and casting hard spots.
Can G9Ni14 be welded?
Yes — weldability is rated good (65/100). Weldable with low-hydrogen SMAW/GTAW using matching 3.5Ni or Ni-base consumables, preheat 100–150 °C, interpass control and PWHT ~580–620 °C; avoid high heat input to protect −100 °C toughness.
What surface finishes work on G9Ni14?
Not anodizable; protect with shot blast plus epoxy/zinc-rich paint, or electroless nickel/plating for wet or outdoor service; machined sealing faces polish well.
Can G9Ni14 be formed, bent or molded?
Supplied as sand or investment castings; needs generous risering (high solidification shrinkage) and full quench-and-temper of the finished shape — cold forming is not a normal route.
What is the maximum service temperature of G9Ni14?
G9Ni14 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 G9Ni14-QT and G9Ni14 QT-HS?
QT is the default condition — standard delivery condition for EN 10213 low-temperature valve and pump castings needing −100 °C toughness with Rp0.2 ≥ 360 MPa. QT-HS: same heat treatment on heavy-wall castings; reduced cooling rate lowers guaranteed yield strength and mid-wall toughness. Yield strength is 400 MPa in QT versus 370 MPa in QT-HS.
How much does G9Ni14 cost?
G9Ni14 is a premium-cost steel ($$$), cheaper than about 51% 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 (low-temperature grades, 1.5638) — CEN (2016)
- EN 10027-1 / EN 10213-3 designation and mechanical property tables — CEN (1995)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (cast low-alloy and Ni steels) — ASM International (1990)
- EN 13445-3 — Unfired pressure vessels, design (physical property data for ferritic steels) — CEN (2021)
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.