Stainless Steel ZG1Cr18Ni9Ti
ASTM CF8C
ZG1Cr18Ni9Ti is a titanium-stabilized Chinese cast austenitic stainless steel equivalent to ASTM CF8C, where Ti locks up carbon to prevent intergranular carbide precipitation in welded or hot-service castings.
Reference datasheet — ZG1Cr18Ni9Ti 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 ST condition
ZG1Cr18Ni9Ti tempers and conditions
ZG1Cr18Ni9Ti is supplied in 4 conditions, soft to hard. ST is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost condition for non-critical, low-corrosivity parts where carbide networks and residual casting stress are acceptable. | 240 | 470 | 25 | 165 HB | 2.3 % IACS |
STDefault Solution annealed | Standard supply condition: maximum ductility, toughness and corrosion resistance for valve bodies, pumps and pressure-containing castings. | 245 | 500 | 38 | 150 HB | — |
Hot isostatically pressed then solution treated | Specified for pressure-critical or fatigue-loaded castings where internal microporosity must be closed (RT film/UT class 1). | 250 | 520 | 45 | 150 HB | 2.3 % IACS |
Solution treated then stabilizing anneal ~870–900 °C | Choose when the casting runs long-term in the 450–850 °C sensitization range or sees severe intergranular attack (nitric acid); the stabilizing anneal at 870–900 °C after solution treatment ties up carbon. | 255 | 510 | 34 | 155 HB | 2.3 % IACS |
What is ZG1Cr18Ni9Ti?
ZG1Cr18Ni9Ti is a titanium-stabilized Chinese cast austenitic stainless steel equivalent to ASTM CF8C, where Ti locks up carbon to prevent intergranular carbide precipitation in welded or hot-service castings. It carries the highest service temperature in this group at 800 °C, with 245 MPa yield, 500 MPa tensile, 38 % elongation and 150 HB. Supplied as sand and investment castings for exhaust and valve work. Machinability is low (score 35) and, without molybdenum, aqueous chloride resistance is the weakest here (score 62) — choose ZG1Cr18Ni12Mo2Ti / CF8M for chloride media. ZG1Cr18Ni9Ti 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). ZG1Cr18Ni9Ti has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi).
What is ZG1Cr18Ni9Ti used for?
- exhaust and manifold castings
- high-temperature valve bodies
- welded pressure castings
Limitations
- Low strength — 245 MPa (35.5 ksi), worse than 94% 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
ZG1Cr18Ni9Ti properties
Typical room-temperature values for ZG1Cr18Ni9Ti-ST; bars are the position among stainless steel grades.
Physical3
ZG1Cr18Ni9Ti 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).
Mechanical16
ZG1Cr18Ni9Ti has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
ZG1Cr18Ni9Ti is rated for continuous service to 800°C (1,472 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
ZG1Cr18Ni9Ti conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of ZG1Cr18Ni9Ti takes about 53 MJ of energy and emits 4.5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
ZG1Cr18Ni9Ti's machinability is fair (35/100, better than 51% of stainless steel grades); weldability very good (75/100); 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. ZG1Cr18Ni9Ti is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ZG1Cr18Ni9Ti
Is ZG1Cr18Ni9Ti easy to machine?
Gummy and work-hardening like 304 — use rigid setups, sharp positive-rake carbide, 60–110 m/min, heavy feed and flood coolant; skin sand/scale must be removed before finishing cuts.
Can ZG1Cr18Ni9Ti be welded?
Readily welded by GTAW/SMAW, but titanium burns out across the arc — use ER347/E347 (Nb-stabilized) or 308L filler; no post-weld anneal required thanks to stabilization.
Can ZG1Cr18Ni9Ti be formed, bent or molded?
Sand or investment cast at 1520–1560 °C with generous risering (≈2.3 % solidification shrinkage) and controlled 5–15 % delta ferrite to avoid hot tearing.
ZG1Cr18Ni9Ti 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 |
|---|---|---|
| C≤0.12 % per GB 2100 legacy ZG1Cr18Ni9Ti; ≤0.08 % in CF8C | ≤ 0.12 | 0.08 |
| Si | ≤ 1.5 | 1 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.03 |
| Cr | 17 – 20 | 18.5 |
| Ni | 8 – 11 | 9.5 |
| Ti≥5×C (stabilizer); CF8C uses Nb ≥8×C, ≤1.0 % instead | ≤ 0.8 | 0.5 |
| Moresidual only unless otherwise agreed | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on ZG1Cr18Ni9Ti?
Grit-blast, pickle in HNO₃/HF then passivate per ASTM A967; electropolish or mechanical polish for hygienic surfaces — no anodizing.
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 ZG1Cr18Ni9Ti in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- CF8C
How much does ZG1Cr18Ni9Ti cost?
ZG1Cr18Ni9Ti 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.
ZG1Cr18Ni9Ti — frequently asked
What is ZG1Cr18Ni9Ti used for?
ZG1Cr18Ni9Ti is typically used for exhaust and manifold castings, high-temperature valve bodies and welded pressure castings. In short: highest service temperature here; stabilized CF8C equivalent; no post-weld anneal needed.
What is the yield strength of ZG1Cr18Ni9Ti?
ZG1Cr18Ni9Ti has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 94% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is ZG1Cr18Ni9Ti easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Gummy and work-hardening like 304 — use rigid setups, sharp positive-rake carbide, 60–110 m/min, heavy feed and flood coolant; skin sand/scale must be removed before finishing cuts.
Can ZG1Cr18Ni9Ti be welded?
Yes — weldability is rated very good (75/100). Readily welded by GTAW/SMAW, but titanium burns out across the arc — use ER347/E347 (Nb-stabilized) or 308L filler; no post-weld anneal required thanks to stabilization.
What surface finishes work on ZG1Cr18Ni9Ti?
Grit-blast, pickle in HNO₃/HF then passivate per ASTM A967; electropolish or mechanical polish for hygienic surfaces — no anodizing.
Can ZG1Cr18Ni9Ti be formed, bent or molded?
Sand or investment cast at 1520–1560 °C with generous risering (≈2.3 % solidification shrinkage) and controlled 5–15 % delta ferrite to avoid hot tearing.
What is the maximum service temperature of ZG1Cr18Ni9Ti?
ZG1Cr18Ni9Ti is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZG1Cr18Ni9Ti-ST and ZG1Cr18Ni9Ti-F?
ST is the default condition — standard supply condition: maximum ductility, toughness and corrosion resistance for valve bodies, pumps and pressure-containing castings. F: lowest-cost condition for non-critical, low-corrosivity parts where carbide networks and residual casting stress are acceptable. Yield strength is 245 MPa in ST versus 240 MPa in F.
How much does ZG1Cr18Ni9Ti cost?
ZG1Cr18Ni9Ti 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
- GB/T 2100 (incl. legacy GB 2100 ZG1Cr18Ni9Ti) (2017)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts (CF8C) — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Cast Stainless Steels) — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America (1995)
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.