Stainless Steel 1.4837
EN 1.4837 · UNS J93503 · ASTM A297 Grade HH
EN 1.4837 (GX40CrNiSi25-12, ASTM A297 Grade HH, UNS J93503) is a silicon-alloyed 25Cr-12Ni austenitic-ferritic cast heat-resistant stainless steel for oxidizing service up to about 1050 °C.
Reference datasheet — 1.4837 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 F condition
1.4837 tempers and conditions
1.4837 is supplied in 4 conditions, soft to hard. F 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 ~1050–1100 °C, rapid cool | Pick when maximum room-temperature ductility/toughness or improved machinability before final fitting is needed, or to reset a part after long intermediate-temperature exposure. | 245 | 490 | 16 | 175 HB | 1.9 % IACS |
FDefault As fabricated | Standard supply condition for furnace fixtures and grates — the coarse as-cast carbide network is fully adequate because the part will operate at 900–1050 °C anyway. | 265 | 520 | 12 | 190 HB | 1.9 % IACS |
Investment (precision) cast, as-cast | For small, thin-walled furnace fixtures, chain links, trays and baskets where near-net shape and finer grain give slightly better ductility than sand casting. | 270 | 530 | 14 | 190 HB | 1.9 % IACS |
Centrifugally cast | Choose for radiant tubes, rolls and sleeves — the dense, directionally solidified wall gives higher strength and less porosity than static sand castings. | 280 | 550 | 10 | 200 HB | 1.9 % IACS |
What is 1.4837?
EN 1.4837 (GX40CrNiSi25-12, ASTM A297 Grade HH, UNS J93503) is a silicon-alloyed 25Cr-12Ni austenitic-ferritic cast heat-resistant stainless steel for oxidizing service up to about 1050 °C. It is specified for furnace fixtures, kiln furniture and radiant components and is produced as static, centrifugal and investment castings. As-cast values are 265 MPa yield, 520 MPa tensile, 12 % elongation and 190 HB. The high carbon content gives hot strength but low room-temperature ductility, and the alloy embrittles after long exposure; use 25Cr-20Ni 1.4848 (HK) for more severe temperatures. 1.4837 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,370°C (2,498 °F). 1.4837 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 185 GPa (26.8 Msi).
What is 1.4837 used for?
- heat-treatment furnace fixtures
- kiln furniture
- radiant tubes
- grate bars
- burner components
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Hard to polish — 40/100, worse than 99% of stainless steel grades
- Limited ductility — 12%, worse than 95% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Limited formability — 12/100, worse than 93% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
1.4837 properties
Typical room-temperature values for 1.4837-F; bars are the position among stainless steel grades.
Physical3
1.4837 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical15
1.4837 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1.4837 is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4837 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4837 takes about 58 MJ of energy and emits 4.3 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
1.4837's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability fair (40/100); formability not recommended (12/100).
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. 1.4837 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4837
Is 1.4837 easy to machine?
Machine like a hard cast austenitic: rigid setup, sharp carbide or ceramic tooling, low speed with heavy feed, generous coolant, and expect abrasive carbide wear plus work hardening if the tool dwells.
Can 1.4837 be welded?
Weldable by SMAW/GTAW with matching 25/12 (E310) or over-alloyed 25/20 filler; preheat 150–250 °C, keep heat input moderate, slow-cool to avoid carbide/sigma cracking, and re-solution anneal if maximum ductility is required.
Can 1.4837 be formed, bent or molded?
Cast to shape only — no cold forming; use generous fillets, uniform walls, chills and risers to control hot tearing and shrinkage, and allow for ~2 % pattern shrink.
1.4837 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 |
|---|---|---|
| CASTM A297 HH allows 0.20–0.50 % | 0.3 – 0.5 | 0.4 |
| Siraises scaling resistance | 1 – 2.5 | 1.7 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 24 – 27 | 25.5 |
| Ni | 11 – 14 | 12.5 |
| Moresidual only | ≤ 0.5 | — |
| Fe | balance | — |
What surface finishes work on 1.4837?
Shot blast and grind cast surfaces; no anodizing — for extra scale life above 1000 °C consider aluminising or ceramic wash, and passivate only if aqueous service is expected.
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 1.4837 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J93503
- ASTM
- A297 Grade HH
- EN / DIN / Werkstoff-Nr.
- GX40CrNiSi25-12
How much does 1.4837 cost?
1.4837 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
1.4837 — frequently asked
What is 1.4837 used for?
1.4837 is typically used for heat-treatment furnace fixtures, kiln furniture, radiant tubes, grate bars and burner components. In short: cast furnace-fixture grade; 1050 °C oxidation resistance; lower cost than HK/HP.
What is the yield strength of 1.4837?
1.4837 has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 81% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4837 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machine like a hard cast austenitic: rigid setup, sharp carbide or ceramic tooling, low speed with heavy feed, generous coolant, and expect abrasive carbide wear plus work hardening if the tool dwells.
Can 1.4837 be welded?
With care — weldability is rated fair (40/100). Weldable by SMAW/GTAW with matching 25/12 (E310) or over-alloyed 25/20 filler; preheat 150–250 °C, keep heat input moderate, slow-cool to avoid carbide/sigma cracking, and re-solution anneal if maximum ductility is required.
What surface finishes work on 1.4837?
Shot blast and grind cast surfaces; no anodizing — for extra scale life above 1000 °C consider aluminising or ceramic wash, and passivate only if aqueous service is expected.
Can 1.4837 be formed, bent or molded?
Cast to shape only — no cold forming; use generous fillets, uniform walls, chills and risers to control hot tearing and shrinkage, and allow for ~2 % pattern shrink.
What is the maximum service temperature of 1.4837?
1.4837 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.
What is the difference between 1.4837-F and 1.4837-SA?
F is the default condition — standard supply condition for furnace fixtures and grates — the coarse as-cast carbide network is fully adequate because the part will operate at 900–1050 °C anyway. SA: pick when maximum room-temperature ductility/toughness or improved machinability before final fitting is needed, or to reset a part after long intermediate-temperature exposure. Yield strength is 265 MPa in F versus 245 MPa in SA.
How much does 1.4837 cost?
1.4837 is a premium-cost stainless steel ($$$), cheaper than about 51% 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)
- ASTM A297/A297M — Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application — ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (heat-resistant castings) — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America (1995)
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.