Stainless Steel 1.4857 Aged
Heat-treated state
EN 1.4857 · UNS J95705 · ASTM A297 Grade HP
Aged = thermally aged / service-exposed
Reference condition for integrity and repair-weld assessment of tubes after service — secondary carbide and sigma precipitation strongly embrittle the alloy at room temperature.
Values for the Aged condition
Other 1.4857 tempers and conditions
1.4857 is listed in 3 conditions; see the grade overview at 1.4857.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Occasionally specified to dissolve part of the eutectic carbide network and restore ductility before machining or welding of thick sections. | 240 | 460 | 16 | 175 HB | 1.7 % IACS |
FDefault As fabricated | Standard supply condition for cast fittings, hangers, trays and furnace parts; used directly without heat treatment. | 250 | 450 | 10 | 190 HB | — |
AgedThis page Thermally aged / service-exposed | Reference condition for integrity and repair-weld assessment of tubes after service — secondary carbide and sigma precipitation strongly embrittle the alloy at room temperature. | 290 | 420 | 3 | 19 HRC | 1.8 % IACS |
What is 1.4857 Aged?
1.4857 Aged is 1.4857 heat treated to Aged — reference condition for integrity and repair-weld assessment of tubes after service — secondary carbide and sigma precipitation strongly embrittle the alloy at room temperature. 1.4857 Aged has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 3% and the elastic modulus is 172 GPa (24.9 Msi). 1.4857 Aged has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F). F is the default condition FabDigit quotes; Aged is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Limited ductility — 3%, worse than 100% of stainless steel grades
- Limited formability — 2/100, worse than 100% of stainless steel grades
- Low stiffness — 172 GPa (24.9 Msi), worse than 99% of stainless steel grades
- Difficult to machine — 20/100, worse than 98% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
1.4857 Aged properties
Typical room-temperature values for 1.4857 Aged; 23 are specific to this condition. Other listed values are 1.4857 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4857 Aged has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical13
1.4857 Aged has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 3% and the elastic modulus is 172 GPa (24.9 Msi).
Thermal6
1.4857 Aged is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
1.4857 Aged conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4857 Aged takes about 90 MJ of energy and emits 6.5 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
1.4857 Aged's machinability is poor (20/100, worse than 98% of stainless steel grades); weldability poor (25/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4857 Aged
Is 1.4857 easy to machine?
Difficult: rigid setups, carbide or ceramic tooling, low speed with heavy positive feed to cut under the work-hardened skin; grind or EDM aged material.
Can 1.4857 be welded?
Weld with matching HP or 35/26 filler (SMAW/GTAW/FCAW), preheat 150–250 °C on heavy sections, low heat input and no post-weld quench; service-aged parts need buttering or carbon-removal cleaning first.
Can 1.4857 be formed, bent or molded?
Cast only — static sand casting for fittings and centrifugal casting for tubes; feed heavy sections generously due to the wide freezing range and high shrinkage.
What surface finishes work on 1.4857?
Normally supplied shot-blasted or machined; internal tube bores are bored/honed. No anodising; heat-resisting aluminide or ceramic coatings can be applied for sulphidising service.
1.4857 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 |
|---|---|---|
| CASTM A297 HP allows 0.35–0.75 % | 0.3 – 0.5 | 0.4 |
| Siraises scaling resistance | 1 – 2.5 | 1.7 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.02 |
| Cr | 24 – 27 | 25.5 |
| Ni | 33 – 36 | 34.5 |
| Moresidual, not intentionally added | ≤ 0.5 | 0.2 |
| Fe | balance | — |
1.4857 Aged — frequently asked
What is 1.4857 Aged used for?
1.4857 Aged is typically used for furnace radiant tubes, heat-treatment fixtures and high-temperature process components. In short: standard HP cast grade; 1100 °C service temperature; no niobium stabilization.
What is the yield strength of 1.4857 Aged?
1.4857 Aged has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 72% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4857 Aged easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of stainless steel grades). Difficult: rigid setups, carbide or ceramic tooling, low speed with heavy positive feed to cut under the work-hardened skin; grind or EDM aged material.
Can 1.4857 Aged be welded?
Not readily — weldability is rated poor (25/100). Weld with matching HP or 35/26 filler (SMAW/GTAW/FCAW), preheat 150–250 °C on heavy sections, low heat input and no post-weld quench; service-aged parts need buttering or carbon-removal cleaning first.
What surface finishes work on 1.4857 Aged?
Normally supplied shot-blasted or machined; internal tube bores are bored/honed. No anodising; heat-resisting aluminide or ceramic coatings can be applied for sulphidising service.
Can 1.4857 Aged be formed, bent or molded?
Cast only — static sand casting for fittings and centrifugal casting for tubes; feed heavy sections generously due to the wide freezing range and high shrinkage.
What is the maximum service temperature of 1.4857 Aged?
1.4857 Aged is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4857-F and 1.4857 Aged?
F is the default condition — standard supply condition for cast fittings, hangers, trays and furnace parts; used directly without heat treatment. Aged: reference condition for integrity and repair-weld assessment of tubes after service — secondary carbide and sigma precipitation strongly embrittle the alloy at room temperature. Yield strength is 250 MPa in F versus 290 MPa in Aged.
Sources
- EN 10295 — Heat resistant steel castings — CEN (2002)
- ASTM A297/A297M — Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application (Grade HP) — ASTM International (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Heat-Resistant Castings) — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (High-temperature corrosion of cast heat-resistant alloys) — ASM International (2005)
- Centrifugally cast reformer tube alloy datasheets (HP / HP-Nb family) — Various foundries (2023)
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.