Stainless Steel 1.4837-INV
Print state
EN 1.4837 · UNS J93503 · ASTM A297 Grade HH
INV = 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.
Values for the INV condition
Other 1.4837 tempers and conditions
1.4837 is listed in 4 conditions; see the grade overview at 1.4837.
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 |
INVThis page 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-INV?
1.4837-INV is 1.4837 in the INV condition — 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. 1.4837-INV has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 185 GPa (26.8 Msi). 1.4837-INV 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). F is the default condition FabDigit quotes; INV is available on request or by drawing note.
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Difficult to machine — 23/100, worse than 93% of stainless steel grades
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Limited ductility — 14%, worse than 91% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
1.4837-INV properties
Typical room-temperature values for 1.4837-INV; 23 are specific to this condition. Other listed values are 1.4837 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4837-INV 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-INV has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1.4837-INV 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-INV 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-INV 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-INV's machinability is poor (23/100, worse than 93% of stainless steel grades); weldability fair (40/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4837-INV
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.
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.
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 | — |
1.4837-INV — frequently asked
What is 1.4837-INV used for?
1.4837-INV 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-INV?
1.4837-INV has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 79% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4837-INV easy to machine?
Not especially — machinability is rated poor (23/100, worse than 93% 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-INV 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-INV?
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-INV 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-INV?
1.4837-INV 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.