Stainless Steel 1.4849
EN 1.4849
High-nickel (38Ni-19Cr) niobium-stabilized centrifugally cast heat-resistant alloy used in ethylene furnace and reformer radiant tubes for improved carburization and creep resistance versus standard HK/HP grades.
Reference datasheet — 1.4849 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.
1.4849 tempers and conditions
1.4849 is supplied in 3 conditions, soft to hard.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed ~1150 °C, rapid cooled | Occasionally specified to dissolve part of the primary carbide network and restore ductility before heavy machining or weld repair of thick sections. | 235 | 470 | 15 | 165 HB | 1.7 % IACS |
Statically (sand) cast, as-cast | Choose for fittings, return bends, headers, tube supports and shaped parts that cannot be centrifugally cast; coarser grain and slightly lower ductility. | 240 | 460 | 8 | 175 HB | 1.7 % IACS |
Thermally aged / service exposed | Reference condition for integrity assessment of tubes after service: secondary carbide and G-phase precipitation embrittles the alloy at room temperature. | 290 | 500 | 3 | 17 HRC | 1.8 % IACS |
Supply forms, finishes and certifications
Ways 1.4849 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CCDefault | Centrifugally cast, as-cast | Surface finish |
What is 1.4849?
High-nickel (38Ni-19Cr) niobium-stabilized centrifugally cast heat-resistant alloy used in ethylene furnace and reformer radiant tubes for improved carburization and creep resistance versus standard HK/HP grades. 1.4849 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,320°C (2,408 °F). 1.4849 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 170 GPa (24.7 Msi).
What is 1.4849 used for?
- ethylene cracking coil tubes
- steam reformer tubes
- petrochemical radiant furnace fittings
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Low stiffness — 170 GPa (24.7 Msi), worse than 100% 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
- Difficult to machine — 20/100, worse than 98% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
1.4849 properties
Typical room-temperature values; bars are the position among stainless steel grades.
Physical3
1.4849 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical12
1.4849 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 170 GPa (24.7 Msi).
Thermal6
1.4849 is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4849 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 63% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4849 takes about 80 MJ of energy and emits 6.2 kg of CO₂ — more than 89% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4849's machinability is poor (20/100, worse than 98% of stainless steel grades); weldability good (55/100); 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. 1.4849 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4849
Is 1.4849 easy to machine?
Machine with rigid setups, positive-rake carbide or ceramic inserts, low speed and heavy constant feed; the Nb/Cr carbide network is abrasive and the austenite work-hardens, so avoid dwelling and interrupted light cuts.
Can 1.4849 be welded?
Weld as-cast with matching 38-19Nb filler (GTAW root, SMAW/FCAW fill), low heat input, no preheat needed for new material; aged/service-exposed tubes need degreasing, decarburising burn-out or buttering plus a temper-bead/dilution-control procedure.
Can 1.4849 be formed, bent or molded?
Not cold formable — shape is fixed by centrifugal or static casting; keep uniform wall, generous fillets and a machining allowance on the bore for the columnar-grain layer.
1.4849 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 |
|---|---|---|
| Cprimary carbide former with Nb/Cr | 0.3 – 0.5 | 0.4 |
| Siimproves carburisation resistance | 1 – 2.5 | 1.7 |
| Mn | ≤ 1.5 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 18 – 21 | 19 |
| Ni | 36 – 39 | 38 |
| Nbstabilises carbides, raises creep strength | 1.2 – 1.8 | 1.5 |
| Fe | balance | — |
What surface finishes work on 1.4849?
Normally supplied shot-blasted or machined bore/OD; no plating or anodising is used, and a protective Cr2O3/SiO2 scale is grown in service, so avoid chloride-bearing marking inks and grinding contamination from carbon steel.
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 1.4849 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX40NiCrSiNb38-19
How much does 1.4849 cost?
1.4849 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.
1.4849 — frequently asked
What is 1.4849 used for?
1.4849 is typically used for ethylene cracking coil tubes, steam reformer tubes and petrochemical radiant furnace fittings. In short: high-Ni carburization resistance; centrifugal tube alloy; machinability score 20.
What is the yield strength of 1.4849?
1.4849 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4849 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of stainless steel grades). Machine with rigid setups, positive-rake carbide or ceramic inserts, low speed and heavy constant feed; the Nb/Cr carbide network is abrasive and the austenite work-hardens, so avoid dwelling and interrupted light cuts.
Can 1.4849 be welded?
Yes — weldability is rated good (55/100). Weld as-cast with matching 38-19Nb filler (GTAW root, SMAW/FCAW fill), low heat input, no preheat needed for new material; aged/service-exposed tubes need degreasing, decarburising burn-out or buttering plus a temper-bead/dilution-control procedure.
What surface finishes work on 1.4849?
Normally supplied shot-blasted or machined bore/OD; no plating or anodising is used, and a protective Cr2O3/SiO2 scale is grown in service, so avoid chloride-bearing marking inks and grinding contamination from carbon steel.
Can 1.4849 be formed, bent or molded?
Not cold formable — shape is fixed by centrifugal or static casting; keep uniform wall, generous fillets and a machining allowance on the bore for the columnar-grain layer.
What is the maximum service temperature of 1.4849?
1.4849 is rated for continuous use to about 1,050°C (1,922 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4849 cost?
1.4849 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)
- DIN 17465 — Heat resistant steel castings (superseded) — DIN (1989)
- ASM Handbook Vol.1 — Cast Heat-Resistant Steels (HK/HP/HT types) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion in Reforming and Pyrolysis Furnaces — ASM International (2005)
- Centrifugally cast reformer/ethylene tube alloy datasheets (1.4849 / HT-Nb class) — Heat-resistant casting producers (2022)
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.