Stainless Steel S43037
UNS S43037
S43037 (Type 439) is a Ti/Nb-stabilized 17 % Cr ferritic stainless, a stabilized development of 430 in which the interstitials are tied up so the heat-affected zone stays ductile and free of sensitization.
Reference datasheet — S43037 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 2B condition
S43037 tempers and conditions
S43037 is supplied in 5 conditions, soft to hard. Annealed 2B is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cold rolled, annealed and pickled, dull matte finish | Choose the dull matte cold rolled, annealed and pickled finish for deep drawing, where lubricant retention limits galling and elongation reaches 32% at 275 MPa yield. | 275 | 470 | 32 | 145 HB | 2.9 % IACS |
Annealed 2BDefault Cold rolled, annealed, pickled and skin-passed | Pick the default cold rolled, annealed, pickled and skin-passed sheet or coil for exhaust parts and appliance liners, giving the best balance of forming (78) and welding (82). | 285 | 480 | 30 | 150 HB | — |
As-welded (no post-weld heat treatment) | Use when Ti/Nb stabilization allows service straight from the weld without sensitization risk; accept weld grain coarsening that limits elongation to 18% and lowers impact toughness. | 290 | 470 | 18 | 155 HB | 2.9 % IACS |
Temper rolled / skin-passed (light cold work, ~1/8 hard) | Choose the lightly cold-rolled, skin-passed state (about 1/8 hard) when higher stiffness and flatness are needed but parts must still bend; yield rises to 420 MPa, elongation falls to 18%. | 420 | 540 | 18 | 185 HB | 2.9 % IACS |
Quarter hard | Choose for spring clips and clamps that need the higher 520 MPa yield but only small-deformation bends; quarter-hard cold rolling cuts elongation to 10% and formability. | 520 | 620 | 10 | 17 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways S43037 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CD Bar | Cold drawn bar / wire | Supply form |
Welded Tube Annealed | Welded tube, bright/post-weld annealed | Supply form |
BA | BA / 2BA | Surface finish |
HRAP No.1 | Hot rolled, annealed and pickled plate/coil | Surface finish |
What is S43037?
S43037 (Type 439) is a Ti/Nb-stabilized 17 % Cr ferritic stainless, a stabilized development of 430 in which the interstitials are tied up so the heat-affected zone stays ductile and free of sensitization. Sheet in 2B, 2D and BA finishes, hot-rolled annealed and pickled plate, temper-rolled and 1/4H strip, cold-drawn bar and welded tube are used where weldability (82) and formability (78) matter, with service to 815 °C. Default properties are 285 MPa yield, 480 MPa tensile, 30 % elongation and 150 HB (80 HRB). It is not hardenable, chloride pitting resistance is below 304/316, and heavy strain combined with long high-temperature exposure coarsens the grain. S43037 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F). S43037 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is S43037 used for?
- exhaust systems
- appliance trim
- heat exchanger housings
Advantages
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
- Forms and bends easily — 78/100, better than 90% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Easy to machine — 45/100, better than 84% of stainless steel grades
- Readily welded — 82/100, better than 84% of stainless steel grades
Limitations
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
S43037 properties
Typical room-temperature values for S43037-Annealed 2B; bars are the position among stainless steel grades.
Physical3
S43037 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
S43037 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S43037 is rated for continuous service to 815°C (1,499 °F). It conducts heat at 24.2 W/m·K (14 BTU/hr·ft·°F), better than 83% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
S43037 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of S43037 takes about 43 MJ of energy and emits 3.4 kg of CO₂ — less than 94% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
S43037's machinability is fair (45/100, better than 84% of stainless steel grades); weldability very good (82/100); formability very good (78/100).
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. S43037 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S43037
Is S43037 easy to machine?
Machinability is slightly better than 304 but the chips still smear onto the tool: use sharp positive-rake tooling, high feed and plenty of emulsion coolant, and control depth of cut to limit the work-hardened layer and burr formation.
Can S43037 be welded?
GTAW, GMAW, laser and high-frequency welding all work, and the Ti/Nb stabilization means no post-weld anneal is needed in the as-welded condition. Use low heat input with 409Nb/439 or 308L/430LNb type filler, pure argon shielding, and avoid nitrogen-bearing gases that cause coarse-grain embrittlement of the weld.
Can S43037 be formed, bent or molded?
Cold bending, roll forming and stretch forming are good (high r-value), but allow for anisotropy and ridging/roping on drawn surfaces. Keep bend radius ≥1t and avoid heavy deformation followed by long high-temperature exposure, which coarsens the grain.
S43037 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, matched to stabilization | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0 |
| Cr17–18% Cr class (439 family) | 17 – 19 | 17.5 |
| Niresidual | ≤ 0.5 | 0.25 |
| Timain stabilizer, usually Ti ≥ 0.20+4(C+N) | 0.15 – 0.5 | 0.25 |
| Nbsome modified types use Ti+Nb dual stabilization for weld toughness | ≤ 0.5 | 0.15 |
| Aldeoxidation residual | ≤ 0.15 | 0.03 |
| N | ≤ 0.03 | 0.02 |
| Fe | balance |
What surface finishes work on S43037?
2B and BA rolled finishes, mechanical polishing, electropolishing and passivation all apply. The grade cannot be anodized; use chemical coloring or PVD for decorative shades, and always passivate after pickling to restore the passive film.
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 S43037 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- 439
How much does S43037 cost?
S43037 is a standard-cost stainless steel ($$), cheaper than about 71% 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.
S43037 — frequently asked
What is S43037 used for?
S43037 is typically used for exhaust systems, appliance trim and heat exchanger housings. In short: most weldable ferritic stainless; stabilized 430 upgrade; 815 °C exhaust grade.
What is the yield strength of S43037?
S43037 has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is S43037 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% of stainless steel grades). Machinability is slightly better than 304 but the chips still smear onto the tool: use sharp positive-rake tooling, high feed and plenty of emulsion coolant, and control depth of cut to limit the work-hardened layer and burr formation.
Can S43037 be welded?
Yes — weldability is rated very good (82/100). GTAW, GMAW, laser and high-frequency welding all work, and the Ti/Nb stabilization means no post-weld anneal is needed in the as-welded condition. Use low heat input with 409Nb/439 or 308L/430LNb type filler, pure argon shielding, and avoid nitrogen-bearing gases that cause coarse-grain embrittlement of the weld.
What surface finishes work on S43037?
2B and BA rolled finishes, mechanical polishing, electropolishing and passivation all apply. The grade cannot be anodized; use chemical coloring or PVD for decorative shades, and always passivate after pickling to restore the passive film.
Can S43037 be formed, bent or molded?
Cold bending, roll forming and stretch forming are good (high r-value), but allow for anisotropy and ridging/roping on drawn surfaces. Keep bend radius ≥1t and avoid heavy deformation followed by long high-temperature exposure, which coarsens the grain.
What is the maximum service temperature of S43037?
S43037 is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does S43037 cost?
S43037 is a standard-cost stainless steel ($$), cheaper than about 71% 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
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic/Martensitic Stainless Steel Tubing — ASTM International (2022)
- ASTM A959 / SAE-AISI UNS designation system for stainless steels — ASTM International (2022)
- GB/T 3280 (022Cr17Ti / 022Cr17NbTi ) (2015)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Type 439 / 439HP ferritic stainless steel product data — AK Steel / Cleveland-Cliffs (2020)
- Ferritic stainless steels for automotive exhaust (441/439/436) — Outokumpu (2021)
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.