Stainless Steel 1.4874
EN 1.4874
Cobalt-bearing austenitic cast heat-resistant steel (20Ni-20Cr-20Co) engineered for extreme high-temperature strength and hot-hardness in severe thermal service such as engine valve seats and furnace grate parts.
Reference datasheet — 1.4874 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
1.4874 tempers and conditions
1.4874 is supplied in 4 conditions, soft to hard. AC is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed ~1100–1150 °C, rapid cooled | Choose when maximum ductility/toughness and a homogenised matrix are needed before machining or for thermally cycled parts. | 270 | 520 | 12 | 14 HRC | 1.8 % IACS |
ACDefault Spheroidize annealed | Standard commercial supply condition for heat-resistant castings; carbide network retained for maximum hot hardness and wear resistance. | 300 | 560 | 6 | 20 HRC | 1.8 % IACS |
Hot isostatic pressed | Specify for critical fatigue- or thermal-fatigue-loaded castings where internal shrinkage porosity must be eliminated. | 310 | 600 | 10 | 19 HRC | 1.8 % IACS |
Solution annealed and aged/stabilised ~750–850 °C | Pick for maximum hot hardness and dimensional stability in valve seats and long-life hot-section parts, at the cost of room-temperature ductility. | 340 | 600 | 4 | 25 HRC | 1.9 % IACS |
What is 1.4874?
Cobalt-bearing austenitic cast heat-resistant steel (20Ni-20Cr-20Co) engineered for extreme high-temperature strength and hot-hardness in severe thermal service such as engine valve seats and furnace grate parts. 1.4874 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). 1.4874 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 180 GPa (26.1 Msi).
What is 1.4874 used for?
- exhaust valve seat inserts
- furnace grate bars
- high-temperature wear components
- boiler and incinerator fittings
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 88% of stainless steel grades
Limitations
- Limited ductility — 6%, worse than 99% of stainless steel grades
- Difficult to machine — 18/100, worse than 99% of stainless steel grades
- Limited formability — 5/100, worse than 99% of stainless steel grades
- High embodied carbon — 8 kg CO₂/kg, worse than 99% of stainless steel grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of stainless steel grades
1.4874 properties
Typical room-temperature values for 1.4874-AC; bars are the position among stainless steel grades.
Physical3
1.4874 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).
Mechanical17
1.4874 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 180 GPa (26.1 Msi).
Thermal6
1.4874 is rated for continuous service to 1,000°C (1,832 °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 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4874 conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4874 takes about 90 MJ of energy and emits 8 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 55%.
Manufacturability8
1.4874's machinability is poor (18/100, worse than 99% of stainless steel grades); weldability poor (20/100); 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. 1.4874 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4874
Is 1.4874 easy to machine?
Machine with rigid setups, negative-rake carbide or CBN at low speed and heavy feed; interrupted cuts and grinding are common for valve-seat faces because of the hard carbide network.
Can 1.4874 be welded?
Only for repair — preheat 250–400 °C, Ni-base or matching high-alloy filler, low heat input and slow cooling; the high carbon makes the alloy crack-sensitive.
Can 1.4874 be formed, bent or molded?
Casting-only alloy: sand, shell, investment or centrifugal casting with generous feeding; no cold or hot forming after solidification.
1.4874 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 |
|---|---|---|
| Chigh C for carbide-strengthened hot hardness | 0.45 – 0.55 | 0.5 |
| Siaids oxidation resistance and fluidity | ≤ 2 | 1 |
| Mn | ≤ 2 | 1 |
| Pimpurity limit | ≤ 0.04 | — |
| Simpurity limit | ≤ 0.03 | — |
| Croxidation resistance | 19 – 22 | 20 |
| Niaustenite stabiliser | 19 – 22 | 20 |
| Cohot strength / hot hardness | 18 – 22 | 20 |
| Fe | balance | — |
What surface finishes work on 1.4874?
Shot-blast and grind gates; aluminising, chromising or thermal-spray coatings extend life in sulphurous or carburising atmospheres — no anodising applies.
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 1.4874 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX50NiCrCo20-20-20
How much does 1.4874 cost?
1.4874 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.
1.4874 — frequently asked
What is 1.4874 used for?
1.4874 is typically used for exhaust valve seat inserts, furnace grate bars, high-temperature wear components and boiler and incinerator fittings. In short: highest hot hardness here; cobalt-strengthened cast grade; lowest machinability, score 18.
What is the yield strength of 1.4874?
1.4874 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4874 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 99% of stainless steel grades). Machine with rigid setups, negative-rake carbide or CBN at low speed and heavy feed; interrupted cuts and grinding are common for valve-seat faces because of the hard carbide network.
Can 1.4874 be welded?
Not readily — weldability is rated poor (20/100). Only for repair — preheat 250–400 °C, Ni-base or matching high-alloy filler, low heat input and slow cooling; the high carbon makes the alloy crack-sensitive.
What surface finishes work on 1.4874?
Shot-blast and grind gates; aluminising, chromising or thermal-spray coatings extend life in sulphurous or carburising atmospheres — no anodising applies.
Can 1.4874 be formed, bent or molded?
Casting-only alloy: sand, shell, investment or centrifugal casting with generous feeding; no cold or hot forming after solidification.
What is the maximum service temperature of 1.4874?
1.4874 is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4874-AC and 1.4874-SA?
AC is the default condition — standard commercial supply condition for heat-resistant castings; carbide network retained for maximum hot hardness and wear resistance. SA: choose when maximum ductility/toughness and a homogenised matrix are needed before machining or for thermally cycled parts. Yield strength is 300 MPa in AC versus 270 MPa in SA.
How much does 1.4874 cost?
1.4874 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)
- Steel Castings Handbook (SFSA), high-alloy chapter — Steel Founders' Society of America (1995)
- European heat-resistant casting foundry alloy sheets (GX-series) — various foundries (2020)
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.