Stainless Steel 1.4508 CENT-ST
Finish state
EN 1.4508 · UNS J92999 · ASTM CG3M
CENT-ST = centrifugally cast, solution annealed
Pick for tubes, sleeves and rings: the dense, directionally solidified wall gives slightly higher strength and better soundness than static sand casting.
Values for the CENT-ST condition
Other 1.4508 tempers and conditions
1.4508 is listed in 4 conditions; see the grade overview at 1.4508.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Condition of a low-carbon N-alloyed casting after production weld repair; usable without re-annealing because C ≤0.03 % prevents sensitisation, but ferrite/sigma control and NDT are required. | 285 | 520 | 32 | 180 HB | 2.2 % IACS |
STDefault Solution annealed | The only standard supply condition for this grade; maximises corrosion resistance and toughness by dissolving carbides and sigma-forming phases. | 290 | 540 | 40 | 165 HB | 2.2 % IACS |
Hot isostatically pressed then solution annealed | Choose for pressure-retaining or fatigue-critical castings where shrinkage microporosity must be closed; gives higher ductility, toughness and fatigue life. | 300 | 560 | 48 | 165 HB | 2.2 % IACS |
CENT-STThis page Centrifugally cast, solution annealed | Pick for tubes, sleeves and rings: the dense, directionally solidified wall gives slightly higher strength and better soundness than static sand casting. | 310 | 570 | 38 | 170 HB | 2.2 % IACS |
What is 1.4508 CENT-ST?
1.4508 CENT-ST is 1.4508 supplied in the CENT-ST condition — pick for tubes, sleeves and rings: the dense, directionally solidified wall gives slightly higher strength and better soundness than static sand casting. 1.4508 CENT-ST has a yield strength of 310 MPa (45 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 197 GPa (28.6 Msi). 1.4508 CENT-ST has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,400°C (2,552 °F). ST is the default condition FabDigit quotes; CENT-ST is available on request or by drawing note.
Advantages
- Readily welded — 80/100, better than 80% of stainless steel grades
- Tough — resists crack growth — 190 MPa·√m (172.9 ksi·√in), better than 77% of stainless steel grades
Limitations
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.4508 CENT-ST properties
Typical room-temperature values for 1.4508 CENT-ST; 22 are specific to this condition. Other listed values are 1.4508 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4508 CENT-ST has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4508 CENT-ST has a yield strength of 310 MPa (45 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
1.4508 CENT-ST is rated for continuous service to 550°C (1,022 °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 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4508 CENT-ST conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4508 CENT-ST takes about 55 MJ of energy and emits 4.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 75%.
Manufacturability8
1.4508 CENT-ST's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (80/100); formability poor (28/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4508 CENT-ST
Is 1.4508 easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy feed to stay under the hardened skin, and flood coolant; expect ~40 % of AISI 1212.
Can 1.4508 be welded?
Readily welded by GTAW/SMAW/FCAW with 316L or 316LN filler (E316LN/ER316LNi); no post-weld anneal needed thanks to ≤0.03 % C, keep interpass <150 °C and heat input low to limit sigma phase.
Can 1.4508 be formed, bent or molded?
Supplied as sand, investment or centrifugal castings; wide freezing range demands good risering and chills, and nitrogen levels must be held to avoid gas porosity.
What surface finishes work on 1.4508?
Pickle and passivate (ASTM A967) or electropolish after machining; shot blasting alone leaves an iron-contaminated surface that rusts.
1.4508 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 |
|---|---|---|
| Cextra-low carbon, avoids sensitisation | ≤ 0.03 | 0.02 |
| Sicasting fluidity | ≤ 1.5 | 1 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 18 – 20 | 19 |
| Ni | 9 – 12 | 11 |
| Mochloride pitting resistance | 2 – 2.5 | 2.3 |
| Nsolid-solution strengthening, austenite stabiliser | 0.1 – 0.2 | 0.15 |
| Fe | balance | — |
1.4508 CENT-ST — frequently asked
What is 1.4508 CENT-ST used for?
1.4508 CENT-ST is typically used for pump casings, valve bodies, chemical processing equipment and marine hardware. In short: nitrogen-strengthened cast 316L; 40% elongation as cast; weld-repairable without anneal.
What is the yield strength of 1.4508 CENT-ST?
1.4508 CENT-ST has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 63% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4508 CENT-ST easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy feed to stay under the hardened skin, and flood coolant; expect ~40 % of AISI 1212.
Can 1.4508 CENT-ST be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/SMAW/FCAW with 316L or 316LN filler (E316LN/ER316LNi); no post-weld anneal needed thanks to ≤0.03 % C, keep interpass <150 °C and heat input low to limit sigma phase.
What surface finishes work on 1.4508 CENT-ST?
Pickle and passivate (ASTM A967) or electropolish after machining; shot blasting alone leaves an iron-contaminated surface that rusts.
Can 1.4508 CENT-ST be formed, bent or molded?
Supplied as sand, investment or centrifugal castings; wide freezing range demands good risering and chills, and nitrogen levels must be held to avoid gas porosity.
What is the maximum service temperature of 1.4508 CENT-ST?
1.4508 CENT-ST is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4508-ST and 1.4508 CENT-ST?
ST is the default condition — the only standard supply condition for this grade; maximises corrosion resistance and toughness by dissolving carbides and sigma-forming phases. CENT-ST: pick for tubes, sleeves and rings: the dense, directionally solidified wall gives slightly higher strength and better soundness than static sand casting. Yield strength is 290 MPa in ST versus 310 MPa in CENT-ST.
Sources
- EN 10213-4 / EN 10213 — Steel castings for pressure purposes, austenitic and austenitic-ferritic grades — CEN (2016)
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASTM A351/A351M — Castings, austenitic, for pressure-containing parts (CG3M, J92999) — ASTM International (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (cast corrosion-resistant steels) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Stainless steel casting alloy datasheets (CF3M/CG3M/1.4408-1.4508 family) — European steel foundries (2022)
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.