Stainless Steel 1.4855
EN 1.4855
Balanced 24Cr-24Ni niobium-stabilized austenitic cast steel developed as an intermediate-alloy alternative to HK/HP grades for radiant furnace tubing with good weldability and thermal fatigue resistance.
Reference datasheet — 1.4855 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 AC condition
1.4855 tempers and conditions
1.4855 is supplied in 3 conditions, soft to hard. AC 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 |
|---|---|---|---|---|---|---|
As-cast plus stress relief / homogenizing anneal | Specified for weld-fabricated or heavily machined assemblies where casting/welding residual stress could cause distortion or thermal-fatigue cracking in service. | 240 | 455 | 13 | 180 HB | 1.9 % IACS |
ACDefault Spheroidize annealed | Standard supply condition for tube supports, hangers, hearth parts and general heat-resistant castings; no heat treatment, EN 10295 mechanical minima apply. | 250 | 470 | 10 | 190 HB | 1.9 % IACS |
As-welded deposit | Reference condition for weld-metal and repair-welded zones; Nb stabilization makes this grade more crack-tolerant to repair welding than HK40. | 260 | 450 | 8 | 195 HB | 1.9 % IACS |
Supply forms, finishes and certifications
Ways 1.4855 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 1.4855?
Balanced 24Cr-24Ni niobium-stabilized austenitic cast steel developed as an intermediate-alloy alternative to HK/HP grades for radiant furnace tubing with good weldability and thermal fatigue resistance. 1.4855 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,340°C (2,444 °F). 1.4855 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 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 1.4855 used for?
- petrochemical radiant tubes
- furnace roller and fixture castings
- high-temperature fittings
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 ductility — 10%, worse than 98% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Low strength — 250 MPa (36.3 ksi), worse than 91% of stainless steel grades
1.4855 properties
Typical room-temperature values for 1.4855-AC; bars are the position among stainless steel grades.
Physical3
1.4855 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,340°C (2,444 °F).
Mechanical16
1.4855 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 175 GPa (25.4 Msi).
Thermal6
1.4855 is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4855 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4855 takes about 55 MJ of energy and emits 4.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4855's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (55/100); formability not recommended (10/100).
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. 1.4855 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4855
Is 1.4855 easy to machine?
Machine with rigid setups, positive-rake carbide (or ceramic for skin cuts), low speed/heavy feed and flood coolant; hard NbC/Cr carbides abrade edges and the austenite work-hardens if the tool dwells.
Can 1.4855 be welded?
GTAW/SMAW with matching 24-24Nb or Ni-base (ERNiCr-3 / 25-35Nb) filler, preheat 150–250 °C, low heat input and no post-weld quench; service-aged parts should be re-solution annealed or buttered before repair welding.
Can 1.4855 be formed, bent or molded?
Cast to shape only (static sand/investment or centrifugal); allow generous fillets, 3–5 % solidification shrinkage risers and gradual wall transitions to avoid hot tears.
1.4855 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, gives creep strength | 0.3 – 0.5 | 0.4 |
| Sioxidation resistance and casting fluidity | 1 – 2.5 | 1.7 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 23 – 25 | 24 |
| Ni | 23 – 25 | 24 |
| Nbstabilizing carbide former (MC/NbC) | 1.2 – 1.8 | 1.5 |
| Fe | balance | — |
What surface finishes work on 1.4855?
Sand/shot blast plus pickle-passivate for scale removal; no anodizing — a self-forming Cr/Si oxide scale is the working surface, and aluminizing or diffusion coatings can be added for carburizing 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 1.4855 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX40CrNiSiNb24-24
How much does 1.4855 cost?
1.4855 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.
1.4855 — frequently asked
What is 1.4855 used for?
1.4855 is typically used for petrochemical radiant tubes, furnace roller and fixture castings and high-temperature fittings. In short: intermediate HK/HP alternative; nb-stabilized 24Cr-24Ni; good thermal fatigue life.
What is the yield strength of 1.4855?
1.4855 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4855 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 for skin cuts), low speed/heavy feed and flood coolant; hard NbC/Cr carbides abrade edges and the austenite work-hardens if the tool dwells.
Can 1.4855 be welded?
Yes — weldability is rated good (55/100). GTAW/SMAW with matching 24-24Nb or Ni-base (ERNiCr-3 / 25-35Nb) filler, preheat 150–250 °C, low heat input and no post-weld quench; service-aged parts should be re-solution annealed or buttered before repair welding.
What surface finishes work on 1.4855?
Sand/shot blast plus pickle-passivate for scale removal; no anodizing — a self-forming Cr/Si oxide scale is the working surface, and aluminizing or diffusion coatings can be added for carburizing service.
Can 1.4855 be formed, bent or molded?
Cast to shape only (static sand/investment or centrifugal); allow generous fillets, 3–5 % solidification shrinkage risers and gradual wall transitions to avoid hot tears.
What is the maximum service temperature of 1.4855?
1.4855 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 1.4855-AC and 1.4855-AW?
AC is the default condition — standard supply condition for tube supports, hangers, hearth parts and general heat-resistant castings; no heat treatment, EN 10295 mechanical minima apply. AW: reference condition for weld-metal and repair-welded zones; Nb stabilization makes this grade more crack-tolerant to repair welding than HK40. Yield strength is 250 MPa in AC versus 260 MPa in AW.
How much does 1.4855 cost?
1.4855 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)
- 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 Fe-Cr-Ni castings) — ASM International (2005)
- Heat-resistant cast alloy datasheets for reformer and radiant tube grades (HK/HP/24-24Nb class) — Foundry producers (e.g. Schmidt+Clemens, Paralloy-type data) (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.