Stainless Steel 12Kh18N9TL
ASTM CF8C
12Kh18N9TL is a titanium-stabilized cast austenitic stainless steel (18Cr-9Ni-Ti) from the GOST family and the direct counterpart to ASTM CF8C.
Reference datasheet — 12Kh18N9TL 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 SA condition
12Kh18N9TL tempers and conditions
12Kh18N9TL is supplied in 5 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
Homogenizing anneal 1100–1150 °C, air cooled | For heavy-section castings where water quenching would crack; evens out dendritic segregation with slightly lower ductility than water-quenched material. | 230 | 480 | 32 | 148 HB | 2.4 % IACS |
SADefault Solution treated | Standard supply condition for corrosion service — carbides dissolved, maximum ductility and intergranular corrosion resistance. | 240 | 490 | 35 | 150 HB | — |
Stress relieved | Low-temperature stress relief used after weld repair of finished castings when full re-solution treatment is impossible; Ti stabilization protects the HAZ. | 245 | 485 | 30 | 155 HB | 2.4 % IACS |
As fabricated | Use only for non-critical, non-corrosive structural castings; grain-boundary carbides and casting stresses remain. | 250 | 470 | 25 | 165 HB | 2.3 % IACS |
Solution treated plus stabilizing anneal 850–900 °C | Pick for long-term service at 450–750 °C or in strongly oxidizing acids, where all carbon must be fixed as TiC before service. | 255 | 500 | 30 | 155 HB | 2.4 % IACS |
What is 12Kh18N9TL?
12Kh18N9TL is a titanium-stabilized cast austenitic stainless steel (18Cr-9Ni-Ti) from the GOST family and the direct counterpart to ASTM CF8C. The titanium ties up carbon, so castings resist intergranular corrosion after welding or long high-temperature exposure; typical properties are 240 MPa yield, 490 MPa tensile, 35 % elongation and 150 HB, with service to 650 °C. It exists only as sand or investment castings, not as wrought bar or plate, and machining is slow and gummy. With no molybdenum, chloride pitting resistance is moderate (score 66); step up to 12Kh18N12M3TL / CF8M for chloride service. 12Kh18N9TL has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F). 12Kh18N9TL has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 193 GPa (28 Msi).
What is 12Kh18N9TL used for?
- high-temperature valve castings
- exhaust system castings
- welded pressure castings
Advantages
- Readily welded — 80/100, better than 80% of stainless steel grades
- Low embodied carbon — 3.8 kg CO₂/kg, better than 77% of stainless steel grades
Limitations
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
12Kh18N9TL properties
Typical room-temperature values for 12Kh18N9TL-SA; bars are the position among stainless steel grades.
Physical3
12Kh18N9TL has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
12Kh18N9TL has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
12Kh18N9TL is rated for continuous service to 650°C (1,202 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
12Kh18N9TL conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of 12Kh18N9TL takes about 57 MJ of energy and emits 3.8 kg of CO₂ — more than 62% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
12Kh18N9TL's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (80/100); 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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 12Kh18N9TL is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 12Kh18N9TL
Is 12Kh18N9TL easy to machine?
Gummy and work-hardening: use sharp positive-rake carbide, rigid setups, 60–110 m/min, heavy feed and flood coolant; avoid dwelling and expect abrasive TiC inclusions.
Can 12Kh18N9TL be welded?
Readily welded by GTAW/SMAW with matching Ti- or Nb-stabilized filler (e.g. 08Kh19N10T / ER321 / ER347); low heat input, no preheat, post-weld solution or stabilizing anneal optional thanks to Ti.
Can 12Kh18N9TL be formed, bent or molded?
Sand or investment cast with generous risering (≈2.3 % solidification shrinkage), controlled 2–8 FN ferrite for hot-tear resistance, and slow, well-fed thick sections.
12Kh18N9TL 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 |
|---|---|---|
| CGOST 977-88 | ≤ 0.12 | 0.09 |
| Si | 0.2 – 1 | 0.6 |
| Mn | 1 – 2 | 1.5 |
| Cr | 17 – 20 | 18.5 |
| Ni | 8 – 11 | 9.5 |
| Tistabilizer, ≈5×C minimum in practice | 0.4 – 0.8 | 0.6 |
| S | ≤ 0.03 | |
| P | ≤ 0.04 | |
| Curesidual | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on 12Kh18N9TL?
Grit blast, pickle in HNO₃/HF then passivate in nitric acid; electropolishing improves hygiene surfaces — no anodizing, plating rarely needed.
Surface treatments FabDigit runs on stainless 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 12Kh18N9TL in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- CF8C
How much does 12Kh18N9TL cost?
12Kh18N9TL is a premium-cost stainless 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.
12Kh18N9TL — frequently asked
What is 12Kh18N9TL used for?
12Kh18N9TL is typically used for high-temperature valve castings, exhaust system castings and welded pressure castings. In short: stabilized cast austenitic; CF8C equivalent; 650 °C service castings.
What is the yield strength of 12Kh18N9TL?
12Kh18N9TL has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 12Kh18N9TL easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and work-hardening: use sharp positive-rake carbide, rigid setups, 60–110 m/min, heavy feed and flood coolant; avoid dwelling and expect abrasive TiC inclusions.
Can 12Kh18N9TL be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/SMAW with matching Ti- or Nb-stabilized filler (e.g. 08Kh19N10T / ER321 / ER347); low heat input, no preheat, post-weld solution or stabilizing anneal optional thanks to Ti.
What surface finishes work on 12Kh18N9TL?
Grit blast, pickle in HNO₃/HF then passivate in nitric acid; electropolishing improves hygiene surfaces — no anodizing, plating rarely needed.
Can 12Kh18N9TL be formed, bent or molded?
Sand or investment cast with generous risering (≈2.3 % solidification shrinkage), controlled 2–8 FN ferrite for hot-tear resistance, and slow, well-fed thick sections.
What is the maximum service temperature of 12Kh18N9TL?
12Kh18N9TL is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 12Kh18N9TL-SA and 12Kh18N9TL-F?
SA is the default condition — standard supply condition for corrosion service — carbides dissolved, maximum ductility and intergranular corrosion resistance. F: use only for non-critical, non-corrosive structural castings; grain-boundary carbides and casting stresses remain. Yield strength is 240 MPa in SA versus 250 MPa in F.
How much does 12Kh18N9TL cost?
12Kh18N9TL is a premium-cost stainless 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
- GOST 977-88 — Steel castings, general specifications — Gosstandart (1988)
- ASTM A351/A351M — Castings, austenitic, for pressure-containing parts (CF8C) — ASTM International (2023)
- ASM Handbook Vol.1 — Properties of Cast Stainless Steels — ASM International (1990)
- Steel Castings Handbook, 6th ed. — SFSA / ASM International (1995)
- Corrosion Handbook (stainless grade behaviour, 321/347 analogues) — Outokumpu (2015)
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.