Stainless Steel 1.4736
EN 1.4736 · UNS S44735 · also 18SR
1.4736 (X3CrAlTi18-2, UNS S44735, 18SR) is a titanium-stabilized 18% Cr ferritic stainless with an aluminium addition that forms an alumina-type scale, giving oxidation and thermal-fatigue resistance to 1050 °C.
Reference datasheet — 1.4736 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 Annealed condition
1.4736 tempers and conditions
1.4736 is supplied in 2 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault cold rolled sheet/strip, mill annealed (2B) | Standard stocked condition for exhaust and heat-exchanger fabrication; best combination of formability and oxidation resistance. | 320 | 510 | 28 | 170 HB | 2.2 % IACS |
1/4 Hard | Use when extra stiffness and flatness are needed for shallow-formed clamps, shields and spring-like parts; forming reserve is limited. | 480 | 590 | 10 | 15 HRC | 2.2 % IACS |
Supply forms, finishes and certifications
Ways 1.4736 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Tube-AW | As-welded tube | Supply form |
BA | BA | Surface finish |
HRAP | Hot rolled, annealed and pickled plate/sheet | Surface finish |
What is 1.4736?
1.4736 (X3CrAlTi18-2, UNS S44735, 18SR) is a titanium-stabilized 18% Cr ferritic stainless with an aluminium addition that forms an alumina-type scale, giving oxidation and thermal-fatigue resistance to 1050 °C. Engineers use it for the hottest sections of welded exhaust systems and furnace ducting as a nickel-free alternative to austenitic heat-resisting grades, in annealed and hot-rolled pickled sheet, bright-annealed strip, 1/4-hard cold-rolled coil and as-welded tube. Typical values are 320 MPa yield, 510 MPa tensile, 28% elongation and 170 HB (85 HRB). Machinability (48) and formability (62) are below austenitics and HAZ toughness is low; 1.4634 is the lower-cost step down. 1.4736 has a density of 7.45 g/cm³ (0.269 lb/in³), lighter than 100% of stainless steel grades. It melts at 1,450°C (2,642 °F). 1.4736 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4736 used for?
- automotive exhaust
- high-temperature ducting
- industrial furnace parts
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
- Easy to machine — 48/100, better than 88% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
- Conducts heat well — 21 W/m·K (12.1 BTU/hr·ft·°F), better than 76% of stainless steel grades
Limitations
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 95% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.4736 properties
Typical room-temperature values for 1.4736-Annealed; bars are the position among stainless steel grades.
Physical3
1.4736 has a density of 7.45 g/cm³ (0.269 lb/in³), lighter than 100% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
1.4736 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4736 is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 21 W/m·K (12.1 BTU/hr·ft·°F), better than 76% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4736 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4736 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4736's machinability is fair (48/100, better than 88% of stainless steel grades); weldability good (65/100); formability good (62/100).
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. 1.4736 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4736
Is 1.4736 easy to machine?
Machines like a soft ferritic stainless — use sharp positive-rake carbide, rigid setups, generous feed and coolant to avoid the gummy built-up edge caused by Ti carbonitrides.
Can 1.4736 be welded?
Readily GTAW/laser/resistance welded thanks to Ti stabilization; keep heat input low, avoid preheat above ~150 °C, and use 430Ti/439 or 309L filler — expect HAZ grain coarsening and reduced RT toughness.
Can 1.4736 be formed, bent or molded?
Good cold bending, roll-forming and moderate deep drawing in the annealed condition; springback is lower than austenitics but total elongation and stretch-forming limits are noticeably tighter than 304.
1.4736 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 |
|---|---|---|
| Clow carbon for weldability | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.4 |
| P | ≤ 0.04 | |
| S | ≤ 0.02 | |
| Cr | 17 – 18.5 | 18 |
| Alforms protective alumina-rich scale | 1.6 – 2.4 | 2 |
| Tistabilizer for C and N | 0.2 – 0.6 | 0.4 |
| N | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 1.4736?
Pickle and passivate after hot work; the alumina-forming surface is inherently scale-resistant, so no coating is normally required — avoid aluminizing on top and never anodize.
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 1.4736 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S44735
- EN / DIN / Werkstoff-Nr.
- X3CrAlTi18-2
- Trade names
- 18SR
How much does 1.4736 cost?
1.4736 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.
1.4736 — frequently asked
What is 1.4736 used for?
1.4736 is typically used for automotive exhaust, high-temperature ducting and industrial furnace parts. In short: highest-temperature ferritic here; alumina-forming, 1050 °C rated; nickel-free heat-resisting sheet.
What is the yield strength of 1.4736?
1.4736 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 60% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is 1.4736 easy to machine?
Reasonably — machinability is rated fair (48/100, better than 88% of stainless steel grades). Machines like a soft ferritic stainless — use sharp positive-rake carbide, rigid setups, generous feed and coolant to avoid the gummy built-up edge caused by Ti carbonitrides.
Can 1.4736 be welded?
Yes — weldability is rated good (65/100). Readily GTAW/laser/resistance welded thanks to Ti stabilization; keep heat input low, avoid preheat above ~150 °C, and use 430Ti/439 or 309L filler — expect HAZ grain coarsening and reduced RT toughness.
What surface finishes work on 1.4736?
Pickle and passivate after hot work; the alumina-forming surface is inherently scale-resistant, so no coating is normally required — avoid aluminizing on top and never anodize.
Can 1.4736 be formed, bent or molded?
Good cold bending, roll-forming and moderate deep drawing in the annealed condition; springback is lower than austenitics but total elongation and stretch-forming limits are noticeably tighter than 304.
What is the maximum service temperature of 1.4736?
1.4736 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.
How much does 1.4736 cost?
1.4736 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 10088-2 Stainless steels — Technical delivery conditions for sheet/plate and strip for general purposes (X3CrAlTi18-2, 1.4736) — CEN (2014)
- EN 10088-1 Stainless steels — List of stainless steels (physical properties) — CEN (2014)
- 18 SR alloy (18Cr-2Al-Ti heat-resisting ferritic stainless) technical data — Allegheny Ludlum / ATI (2000)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (ferritic stainless steels) — ASM International (1990)
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.