Stainless Steel 1.4849-SA
Heat-treated state
EN 1.4849
SA = 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.
Values for the SA condition
Other 1.4849 tempers and conditions
1.4849 is listed in 3 conditions; see the grade overview at 1.4849.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page 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 |
What is 1.4849-SA?
1.4849-SA is 1.4849 heat treated to SA — occasionally specified to dissolve part of the primary carbide network and restore ductility before heavy machining or weld repair of thick sections. 1.4849-SA has a yield strength of 235 MPa (34.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 98% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 170 GPa (24.7 Msi). 1.4849-SA 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).
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
- Low strength — 235 MPa (34.1 ksi), worse than 98% of stainless steel grades
- Limited formability — 8/100, worse than 97% 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
1.4849-SA properties
Typical room-temperature values for 1.4849-SA; 21 are specific to this condition. Other listed values are 1.4849 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4849-SA 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-SA has a yield strength of 235 MPa (34.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 98% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 170 GPa (24.7 Msi).
Thermal6
1.4849-SA is rated for continuous service to 1,050°C (1,922 °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 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4849-SA conducts electricity at 1.7 % IACS, worse than 93% 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 1.4849-SA 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-SA's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (60/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4849-SA
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.
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.
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 | — |
1.4849-SA — frequently asked
What is 1.4849-SA used for?
1.4849-SA 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-SA?
1.4849-SA has a typical yield strength of 235 MPa (34.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 98% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4849-SA easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% 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-SA be welded?
Yes — weldability is rated good (60/100). 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-SA?
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-SA 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-SA?
1.4849-SA 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.