Stainless Steel 1.4308 ST-CENT
Finish state
EN 1.4308 · UNS J92600 · ASTM CF8
ST-CENT = centrifugally cast tube, solution annealed
Centrifugally cast pipe/sleeves (ASTM A451/A452 class) — dense, defect-free wall with the highest as-cast strength for this grade.
Values for the ST-CENT condition
Other 1.4308 tempers and conditions
1.4308 is listed in 4 conditions; see the grade overview at 1.4308.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
pressure-containing certified casting (min. spec values) | Order this when ASME B16.34 / A351 certification with guaranteed minima and hydro/RT testing is required. | 205 | 485 | 35 | 160 HB | 2.4 % IACS |
STDefault Solution annealed | Standard delivery condition for all pressure and corrosion-service castings; carbides dissolved for maximum corrosion resistance and ductility. | 250 | 520 | 50 | 140 HB | 2.4 % IACS |
Spheroidize annealed | Only for non-critical, non-corrosive structural or decorative castings — carbide networks reduce corrosion resistance and toughness. | 260 | 500 | 32 | 160 HB | 2.4 % IACS |
ST-CENTThis page Centrifugally cast tube, solution annealed | Centrifugally cast pipe/sleeves (ASTM A451/A452 class) — dense, defect-free wall with the highest as-cast strength for this grade. | 275 | 550 | 45 | 150 HB | 2.4 % IACS |
What is 1.4308 ST-CENT?
1.4308 ST-CENT is 1.4308 supplied in the ST-CENT condition — centrifugally cast pipe/sleeves (ASTM A451/A452 class) — dense, defect-free wall with the highest as-cast strength for this grade. 1.4308 ST-CENT has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). 1.4308 ST-CENT 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). ST is the default condition FabDigit quotes; ST-CENT is available on request or by drawing note.
Advantages
- Readily welded — 88/100, better than 91% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low strength — 275 MPa (39.9 ksi), worse than 77% of stainless steel grades
1.4308 ST-CENT properties
Typical room-temperature values for 1.4308 ST-CENT; 22 are specific to this condition. Other listed values are 1.4308 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4308 ST-CENT 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
1.4308 ST-CENT has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4308 ST-CENT is rated for continuous service to 760°C (1,400 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
1.4308 ST-CENT conducts electricity at 2.4 % IACS, better than 67% 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 1.4308 ST-CENT takes about 60 MJ of energy and emits 5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4308 ST-CENT's machinability is fair (38/100, better than 63% of stainless steel grades); weldability excellent (88/100); formability poor (28/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4308 ST-CENT
Is 1.4308 easy to machine?
Gummy and work-hardening: use sharp positive-rake carbide, rigid setup, 60–120 m/min, heavy positive feed to cut beneath the hardened layer, plenty of coolant.
Can 1.4308 be welded?
Readily welded by GTAW/SMAW with 308/308L filler; keep interpass low, no preheat, and solution anneal after major repair welds to restore corrosion resistance.
Can 1.4308 be formed, bent or molded?
Sand, investment and centrifugal casting all work well; allow ~2% solidification shrinkage, use generous risers on heavy sections and control δ-ferrite to 5–15 FN for hot-crack resistance.
What surface finishes work on 1.4308?
Pickle/passivate (ASTM A967) or electropolish after machining; shot blasting improves appearance but leaves surface iron that must be removed to avoid rust bloom.
1.4308 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 |
|---|---|---|
| CEN 1.4308 limits C ≤ 0.07 | ≤ 0.08 | 0.06 |
| SiEN: Si ≤ 1.5 | ≤ 2 | 1.2 |
| Mn | ≤ 1.5 | 1 |
| P | ≤ 0.04 | 0.03 |
| SEN: S ≤ 0.030 | ≤ 0.04 | 0.02 |
| CrEN 1.4308: 18.0–20.0 | 18 – 21 | 19.5 |
| Ni | 8 – 11 | 9.5 |
| Moresidual only | ≤ 0.5 | 0.2 |
| Fe | balance | — |
1.4308 ST-CENT — frequently asked
What is 1.4308 ST-CENT used for?
1.4308 ST-CENT is typically used for pump bodies, valve castings and food and chemical processing fittings. In short: cast 304 workhorse; lowest-cost cast austenitic; very high as-cast ductility.
What is the yield strength of 1.4308 ST-CENT?
1.4308 ST-CENT has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4308 ST-CENT easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Gummy and work-hardening: use sharp positive-rake carbide, rigid setup, 60–120 m/min, heavy positive feed to cut beneath the hardened layer, plenty of coolant.
Can 1.4308 ST-CENT be welded?
Yes — weldability is rated excellent (88/100). Readily welded by GTAW/SMAW with 308/308L filler; keep interpass low, no preheat, and solution anneal after major repair welds to restore corrosion resistance.
What surface finishes work on 1.4308 ST-CENT?
Pickle/passivate (ASTM A967) or electropolish after machining; shot blasting improves appearance but leaves surface iron that must be removed to avoid rust bloom.
Can 1.4308 ST-CENT be formed, bent or molded?
Sand, investment and centrifugal casting all work well; allow ~2% solidification shrinkage, use generous risers on heavy sections and control δ-ferrite to 5–15 FN for hot-crack resistance.
What is the maximum service temperature of 1.4308 ST-CENT?
1.4308 ST-CENT is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4308-ST and 1.4308 ST-CENT?
ST is the default condition — standard delivery condition for all pressure and corrosion-service castings; carbides dissolved for maximum corrosion resistance and ductility. ST-CENT: centrifugally cast pipe/sleeves (ASTM A451/A452 class) — dense, defect-free wall with the highest as-cast strength for this grade. Yield strength is 250 MPa in ST versus 275 MPa in ST-CENT.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts — ASTM (2020)
- ASTM A743/A743M — Castings, Iron-Chromium-Nickel, Corrosion Resistant — ASTM (2021)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
- Steel Castings Handbook — Steel Founders' Society of America (1995)
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.