Stainless Steel ZG1Cr18Ni12Mo2Ti-ST (Solution annealed)
Heat-treated state · default condition
ASTM CF8M
Standard supply condition for all pressure and corrosion service — maximum corrosion resistance and ductility.
Values for the ST condition
Other ZG1Cr18Ni12Mo2Ti tempers and conditions
ZG1Cr18Ni12Mo2Ti is listed in 4 conditions; see the grade overview at ZG1Cr18Ni12Mo2Ti.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
STDefaultThis page Solution annealed | Standard supply condition for all pressure and corrosion service — maximum corrosion resistance and ductility. | 245 | 520 | 38 | 160 HB | — |
As fabricated | Only for non-critical, non-corrosive, low-stress parts; carbide networks and residual stresses remain. | 250 | 480 | 22 | 175 HB | 2.3 % IACS |
Solution treated plus stabilizing anneal | Choose for long-term 450–750 °C exposure or highly aggressive acid service where maximum immunity to intergranular attack is required. | 250 | 515 | 33 | 165 HB | 2.3 % IACS |
Centrifugally cast, solution treated | Tubes/sleeves/rings: denser, finer structure gives slightly higher strength and toughness than static castings. | 260 | 550 | 40 | 165 HB | 2.3 % IACS |
What is ZG1Cr18Ni12Mo2Ti-ST?
ZG1Cr18Ni12Mo2Ti-ST is ZG1Cr18Ni12Mo2Ti heat treated to ST — standard supply condition for all pressure and corrosion service — maximum corrosion resistance and ductility. ZG1Cr18Ni12Mo2Ti-ST has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi). ZG1Cr18Ni12Mo2Ti-ST has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,385°C (2,525 °F).
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
ZG1Cr18Ni12Mo2Ti-ST properties
Typical room-temperature values for ZG1Cr18Ni12Mo2Ti-ST; 12 are specific to this condition. Other listed values are ZG1Cr18Ni12Mo2Ti reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ZG1Cr18Ni12Mo2Ti-ST has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
ZG1Cr18Ni12Mo2Ti-ST has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
ZG1Cr18Ni12Mo2Ti-ST is rated for continuous service to 700°C (1,292 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
ZG1Cr18Ni12Mo2Ti-ST conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of ZG1Cr18Ni12Mo2Ti-ST takes about 53 MJ of energy and emits 4.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
ZG1Cr18Ni12Mo2Ti-ST's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (78/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZG1Cr18Ni12Mo2Ti-ST
Is ZG1Cr18Ni12Mo2Ti easy to machine?
Gummy and work-hardening like 316 — rigid setups, positive-rake sharp carbide, heavy constant feed, generous flood coolant, avoid dwelling; expect ~40 % of 1212 rates.
Can ZG1Cr18Ni12Mo2Ti be welded?
Readily welded by GTAW/SMAW with 316L/318 (Nb or Ti-bearing) filler; keep interpass low, no preheat and no PWHT needed thanks to Ti stabilization.
Can ZG1Cr18Ni12Mo2Ti be formed, bent or molded?
Sand or investment cast with generous risers and chills (wide freezing range, ~2.2 % shrinkage); always solution treat and water quench after casting.
What surface finishes work on ZG1Cr18Ni12Mo2Ti?
Pickle and passivate (HNO₃ or citric) after grinding/welding; electropolish for hygienic surfaces — no anodizing; plating rarely used.
ZG1Cr18Ni12Mo2Ti 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 grade ('1Cr' = ≤0.10 % C) | ≤ 0.1 | 0.07 |
| Si | ≤ 1.5 | 1 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.02 |
| Cr | 17 – 20 | 18.5 |
| Ni | 11 – 14 | 12.5 |
| Mo | 2 – 3 | 2.4 |
| Titypically ≥5×C for stabilization | 0.35 – 0.8 | 0.5 |
| Fe | balance | — |
ZG1Cr18Ni12Mo2Ti-ST — frequently asked
What is ZG1Cr18Ni12Mo2Ti-ST used for?
ZG1Cr18Ni12Mo2Ti-ST is typically used for marine valve castings, chemical pump housings and high-temperature corrosive service castings. In short: mo plus Ti cast austenitic; CF8M equivalent; chloride and heat resistant.
What is the yield strength of ZG1Cr18Ni12Mo2Ti-ST?
ZG1Cr18Ni12Mo2Ti-ST has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is ZG1Cr18Ni12Mo2Ti-ST easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and work-hardening like 316 — rigid setups, positive-rake sharp carbide, heavy constant feed, generous flood coolant, avoid dwelling; expect ~40 % of 1212 rates.
Can ZG1Cr18Ni12Mo2Ti-ST be welded?
Yes — weldability is rated very good (78/100). Readily welded by GTAW/SMAW with 316L/318 (Nb or Ti-bearing) filler; keep interpass low, no preheat and no PWHT needed thanks to Ti stabilization.
What surface finishes work on ZG1Cr18Ni12Mo2Ti-ST?
Pickle and passivate (HNO₃ or citric) after grinding/welding; electropolish for hygienic surfaces — no anodizing; plating rarely used.
Can ZG1Cr18Ni12Mo2Ti-ST be formed, bent or molded?
Sand or investment cast with generous risers and chills (wide freezing range, ~2.2 % shrinkage); always solution treat and water quench after casting.
What is the maximum service temperature of ZG1Cr18Ni12Mo2Ti-ST?
ZG1Cr18Ni12Mo2Ti-ST is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZG1Cr18Ni12Mo2Ti-ST and ZG1Cr18Ni12Mo2Ti CENT-ST?
ST is the default condition — standard supply condition for all pressure and corrosion service — maximum corrosion resistance and ductility. CENT-ST: tubes/sleeves/rings: denser, finer structure gives slightly higher strength and toughness than static castings. Yield strength is 245 MPa in ST versus 260 MPa in CENT-ST.
Sources
- GB/T 2100 (general purpose corrosion-resistant steel castings) — SAC / (2017)
- ASTM A351/A351M Castings, Austenitic, for Pressure-Containing Parts (CF8M) — ASTM International (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (cast stainless steels) — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Machinery's Handbook (machinability ratings) — Industrial Press (2020)
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.