Stainless Steel 1.4857-F (As fabricated)
Temper · default condition
EN 1.4857 · UNS J95705 · ASTM A297 Grade HP
Standard supply condition for cast fittings, hangers, trays and furnace parts; used directly without heat treatment.
Values for the F 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 |
FDefaultThis page As fabricated | Standard supply condition for cast fittings, hangers, trays and furnace parts; used directly without heat treatment. | 250 | 450 | 10 | 190 HB | — |
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-F?
1.4857-F is 1.4857 in the F temper — standard supply condition for cast fittings, hangers, trays and furnace parts; used directly without heat treatment. 1.4857-F has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 175 GPa (25.4 Msi). 1.4857-F 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).
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Low stiffness — 175 GPa (25.4 Msi), worse than 99% of stainless steel grades
- Limited formability — 5/100, worse than 99% of stainless steel grades
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
1.4857-F properties
Typical room-temperature values for 1.4857-F; 10 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-F 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-F has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 175 GPa (25.4 Msi).
Thermal6
1.4857-F is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
1.4857-F conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4857-F 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-F's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability fair (45/100); formability not recommended (5/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4857-F
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-F — frequently asked
What is 1.4857-F used for?
1.4857-F 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-F?
1.4857-F has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4857-F easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% 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-F be welded?
With care — weldability is rated fair (45/100). 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-F?
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-F 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-F?
1.4857-F 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.