Stainless Steel CE30-ST (Solution annealed)
Heat-treated state
ASTM CE30 · UNS J93423
Pick when maximum ductility/toughness and freedom from carbide or sigma networks is required (e.g. A744 corrosion-service castings or parts to be welded).
Values for the ST condition
Other CE30 tempers and conditions
CE30 is listed in 3 conditions; see the grade overview at CE30.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
STThis page Solution annealed | Pick when maximum ductility/toughness and freedom from carbide or sigma networks is required (e.g. A744 corrosion-service castings or parts to be welded). | 360 | 640 | 22 | 175 HB | 2.2 % IACS |
Homogenized / stress relieved | Used to relieve casting and weld-repair stresses on large or complex CE30 castings where full solution quenching would risk distortion. | 400 | 655 | 16 | 11 HRC | 2.2 % IACS |
FDefault As fabricated | Standard supply condition for CE30 — the ferrite network keeps intergranular corrosion resistance acceptable without solution annealing, and strength is highest. | 434 | 669 | 18 | 12 HRC | 2.2 % IACS |
What is CE30-ST?
CE30-ST is CE30 heat treated to ST — pick when maximum ductility/toughness and freedom from carbide or sigma networks is required (e.g. A744 corrosion-service castings or parts to be welded). CE30-ST has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 193 GPa (28 Msi). CE30-ST has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,400°C (2,552 °F). F is the default condition FabDigit quotes; ST is available on request or by drawing note.
Advantages
- Good corrosion resistance — 75/100, better than 79% of stainless steel grades
Limitations
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Limited formability — 20/100, worse than 86% of stainless steel grades
- Low fracture toughness — 75 MPa·√m (68.3 ksi·√in), worse than 81% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
CE30-ST properties
Typical room-temperature values for CE30-ST; 22 are specific to this condition. Other listed values are CE30 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CE30-ST has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
CE30-ST has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
CE30-ST is rated for continuous service to 650°C (1,202 °F). It conducts heat at 16.5 W/m·K (9.53 BTU/hr·ft·°F), better than 70% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
CE30-ST conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), better than 79% of stainless steel grades.
Sustainability4
Producing a kilogram of CE30-ST takes about 53 MJ of energy and emits 5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 75%.
Manufacturability8
CE30-ST's machinability is fair (36/100, better than 57% of stainless steel grades); weldability good (55/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CE30-ST
Is CE30 easy to machine?
Machine like a work-hardening duplex stainless: rigid setups, sharp carbide inserts, slow-to-moderate speeds, heavy positive feeds and copious coolant; hard carbides make tool wear high, so plan grinding for finish surfaces.
Can CE30 be welded?
Weldable with ER309/E309 or matching high-Cr filler; keep heat input low, interpass below ~150 °C and avoid 550–850 °C soaking to limit sigma and carbide embrittlement — solution treat and quench after major weld repair.
Can CE30 be formed, bent or molded?
Cast only (sand or investment); the ferrite content improves hot-tear resistance but heavy sections need generous risers and controlled solidification to avoid shrinkage porosity.
What surface finishes work on CE30?
Sand-blast/pickle then passivate in nitric acid; electropolishing gives the best surface, and the alloy holds a hard, oxidation-resistant scale rather than requiring paint or plating.
CE30 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 |
|---|---|---|
| Chigh carbon; carbides tolerated because of ferrite network | ≤ 0.3 | 0.25 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 2 | 1.3 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Cr | 26 – 30 | 28 |
| Ni | 8 – 11 | 9.5 |
| Moresidual only unless CE-30 modified | ≤ 0.5 | — |
| Fe | balance | — |
CE30-ST — frequently asked
What is CE30-ST used for?
CE30-ST is typically used for high-temperature furnace fixtures, heat treatment equipment and kiln components. In short: strongest grade in family; 26Cr austenitic-ferritic structure; service limited to 650 °C.
What is the yield strength of CE30-ST?
CE30-ST has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 51% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CE30-ST easy to machine?
Not especially — machinability is rated fair (36/100, better than 57% of stainless steel grades). Machine like a work-hardening duplex stainless: rigid setups, sharp carbide inserts, slow-to-moderate speeds, heavy positive feeds and copious coolant; hard carbides make tool wear high, so plan grinding for finish surfaces.
Can CE30-ST be welded?
Yes — weldability is rated good (55/100). Weldable with ER309/E309 or matching high-Cr filler; keep heat input low, interpass below ~150 °C and avoid 550–850 °C soaking to limit sigma and carbide embrittlement — solution treat and quench after major weld repair.
What surface finishes work on CE30-ST?
Sand-blast/pickle then passivate in nitric acid; electropolishing gives the best surface, and the alloy holds a hard, oxidation-resistant scale rather than requiring paint or plating.
Can CE30-ST be formed, bent or molded?
Cast only (sand or investment); the ferrite content improves hot-tear resistance but heavy sections need generous risers and controlled solidification to avoid shrinkage porosity.
What is the maximum service temperature of CE30-ST?
CE30-ST 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 CE30-F and CE30-ST?
F is the default condition — standard supply condition for CE30 — the ferrite network keeps intergranular corrosion resistance acceptable without solution annealing, and strength is highest. ST: pick when maximum ductility/toughness and freedom from carbide or sigma networks is required (e.g. A744 corrosion-service castings or parts to be welded). Yield strength is 434 MPa in F versus 360 MPa in ST.
Sources
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2019)
- ASTM A744/A744M — Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service — ASTM International (2021)
- ASM Specialty Handbook: Stainless Steels (cast corrosion-resistant alloys, ACI designations) — ASM International (1994)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Founders' Society of America — Steel Castings Handbook, Supplement 8 (High Alloy Data Sheets) — SFSA (2004)
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.