Stainless Steel 1.4848-F (As fabricated)
Temper · default condition
EN 1.4848 · UNS J94224 · ASTM A297 Grade HK
Standard supply condition for furnace hardware, fixtures, grate bars and shaped castings; no heat treatment applied.
Values for the F condition
Other 1.4848 tempers and conditions
1.4848 is listed in 3 conditions; see the grade overview at 1.4848.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution/diffusion annealed ~1050–1100 °C, rapid cool | Optional treatment to homogenise the carbide network and improve room-temperature ductility/toughness before machining or welding of critical castings. | 260 | 500 | 20 | 175 HB | 1.9 % IACS |
Stress relieved | Use for large or welded/repair-welded castings to relieve residual stress and reduce distortion on first heat-up; strength essentially unchanged. | 275 | 525 | 13 | 190 HB | 1.9 % IACS |
FDefaultThis page As fabricated | Standard supply condition for furnace hardware, fixtures, grate bars and shaped castings; no heat treatment applied. | 280 | 530 | 14 | 190 HB | 1.9 % IACS |
What is 1.4848-F?
1.4848-F is 1.4848 in the F temper — standard supply condition for furnace hardware, fixtures, grate bars and shaped castings; no heat treatment applied. 1.4848-F has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 75% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 185 GPa (26.8 Msi). 1.4848-F has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Limited formability — 8/100, worse than 97% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
- Limited ductility — 14%, worse than 91% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
1.4848-F properties
Typical room-temperature values for 1.4848-F; 21 are specific to this condition. Other listed values are 1.4848 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4848-F has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical14
1.4848-F has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 75% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1.4848-F 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 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4848-F conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4848-F takes about 62 MJ of energy and emits 4.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 75%.
Manufacturability8
1.4848-F's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability fair (45/100); formability not recommended (8/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4848-F
Is 1.4848 easy to machine?
Machine like a sensitised high-carbon austenitic: rigid setup, sharp carbide or ceramic tooling, low speed with heavy positive feed, flood coolant — the primary carbide network is abrasive and the matrix work-hardens badly; grinding is often preferred for finishing.
Can 1.4848 be welded?
Weld with matching HK/ER310 or 25Cr-20Ni filler, low heat input and no preheat needed for new castings; service-aged parts must be locally solution/stress-relief annealed before repair welding to avoid carbide-embrittlement cracking.
Can 1.4848 be formed, bent or molded?
Supplied only as cast (static sand/shell or centrifugal); allow generous risering for the high solidification shrinkage, avoid sharp section changes to limit hot tearing, and machine after cooling — no cold forming.
What surface finishes work on 1.4848?
Normally left as-cast, shot-blasted or pickled; no coating is needed for oxidation service since the Cr-Si oxide scale is protective, and aluminising can be used where sulphidation or carburisation is severe.
1.4848 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 |
|---|---|---|
| CEN 10295 GX40CrNiSi25-20; ASTM A297 HK allows 0.20–0.60, HK40 = 0.35–0.45 | 0.3 – 0.5 | 0.4 |
| SiA297 HK: max 2.00 | 1 – 2.5 | 1.6 |
| Mn | ≤ 2 | 1.2 |
| CrA297 HK: 24.0–28.0 | 24 – 27 | 25.5 |
| NiA297 HK: 18.0–22.0 | 19 – 22 | 20.5 |
| Moresidual only | ≤ 0.5 | — |
| P | ≤ 0.04 | — |
| SA297: max 0.04 | ≤ 0.03 | — |
| Fe | balance | — |
1.4848-F — frequently asked
What is 1.4848-F used for?
1.4848-F is typically used for ethylene cracking furnace tubes, reformer tubes, heat-treat baskets and trays, muffle furnace linings and petrochemical furnace hardware. In short: standard HK cast grade; 1100 °C oxidation service; difficult to machine.
What is the yield strength of 1.4848-F?
1.4848-F has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 75% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4848-F easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine like a sensitised high-carbon austenitic: rigid setup, sharp carbide or ceramic tooling, low speed with heavy positive feed, flood coolant — the primary carbide network is abrasive and the matrix work-hardens badly; grinding is often preferred for finishing.
Can 1.4848-F be welded?
With care — weldability is rated fair (45/100). Weld with matching HK/ER310 or 25Cr-20Ni filler, low heat input and no preheat needed for new castings; service-aged parts must be locally solution/stress-relief annealed before repair welding to avoid carbide-embrittlement cracking.
What surface finishes work on 1.4848-F?
Normally left as-cast, shot-blasted or pickled; no coating is needed for oxidation service since the Cr-Si oxide scale is protective, and aluminising can be used where sulphidation or carburisation is severe.
Can 1.4848-F be formed, bent or molded?
Supplied only as cast (static sand/shell or centrifugal); allow generous risering for the high solidification shrinkage, avoid sharp section changes to limit hot tearing, and machine after cooling — no cold forming.
What is the maximum service temperature of 1.4848-F?
1.4848-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 1.4848-F and 1.4848-SA?
F is the default condition — standard supply condition for furnace hardware, fixtures, grate bars and shaped castings; no heat treatment applied. SA: optional treatment to homogenise the carbide network and improve room-temperature ductility/toughness before machining or welding of critical castings. Yield strength is 280 MPa in F versus 260 MPa in SA.
Sources
- ASTM A297/A297M — Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application (Grade HK) — ASTM International (2019)
- ASTM A608/A608M — Centrifugally Cast Iron-Chromium-Nickel High-Alloy Tubing for Pressure Application at High Temperatures (HK40) — ASTM International (2018)
- EN 10295 — Heat resistant steel castings (GX40CrNiSi25-20, 1.4848) — CEN (2002)
- GB/T 8492 — (ZG40Cr25Ni20) — SAC (2014)
- ASM Handbook Vol. 1 — Heat-Resistant Castings; Vol. 15 Casting — ASM International (1990)
- Heat-resistant cast alloy datasheets for HK40 / 1.4848 (furnace hardware and centrifugal tube producers) — 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.