Stainless Steel 1.4857
EN 1.4857 · UNS J95705 · ASTM A297 Grade HP
Standard HP-type (35Ni-26Cr) cast heat-resistant austenitic steel without niobium stabilization, used for high-temperature furnace tubes and fittings where extreme carburization resistance of HP-Nb is not required.
Reference datasheet — 1.4857 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the F condition
1.4857 tempers and conditions
1.4857 is supplied in 3 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
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 | — |
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 |
Supply forms, finishes and certifications
Ways 1.4857 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CC | Centrifugally cast tube | Surface finish |
What is 1.4857?
Standard HP-type (35Ni-26Cr) cast heat-resistant austenitic steel without niobium stabilization, used for high-temperature furnace tubes and fittings where extreme carburization resistance of HP-Nb is not required. 1.4857 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). 1.4857 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).
What is 1.4857 used for?
- furnace radiant tubes
- heat-treatment fixtures
- high-temperature process components
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 properties
Typical room-temperature values for 1.4857-F; bars are the position among stainless steel grades.
Physical3
1.4857 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 1.4857 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4857
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.
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 | — |
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.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 1.4857 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J95705
- ASTM
- A297 Grade HP
- EN / DIN / Werkstoff-Nr.
- GX40NiCrSi35-26
How much does 1.4857 cost?
1.4857 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4857 — frequently asked
What is 1.4857 used for?
1.4857 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?
1.4857 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 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 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?
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 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?
1.4857 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.
How much does 1.4857 cost?
1.4857 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.