Stainless Steel 439 TR-1/4H
Supply condition
AISI/SAE 439 · UNS S43035 · EN 1.4510, X3CrTi17 · JIS SUS430LX, SUS439 · GB 022Cr17Ti, 022Cr18Ti
TR-1/4H = tR 1/4 Hard
Choose when extra stiffness, flatness and springback control are wanted for roll-formed or lightly bent parts.
Values for the TR-1/4H condition
Other 439 tempers and conditions
439 is listed in 2 conditions; see the grade overview at 439.
- Annealed
- TR-1/4H
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault cold rolled, annealed and pickled (2B/2D sheet, standard supply) | Standard stocked condition for forming, welding and general fabrication of sheet, strip and tube. | 310 | 485 | 30 | 150 HB | 2.9 % IACS |
TR-1/4HThis page TR 1/4 Hard | Choose when extra stiffness, flatness and springback control are wanted for roll-formed or lightly bent parts. | 480 | 580 | 15 | 10 HRC | 2.9 % IACS |
What is 439 TR-1/4H?
439 TR-1/4H is 439 supplied in the TR-1/4H condition — choose when extra stiffness, flatness and springback control are wanted for roll-formed or lightly bent parts. 439 TR-1/4H has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi). 439 TR-1/4H 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). Annealed is the default condition FabDigit quotes; TR-1/4H is available on request or by drawing note.
Advantages
- Easy to machine — 52/100, better than 91% of stainless steel grades
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Conducts heat well — 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- Limited ductility — 15%, worse than 89% of stainless steel grades
- Needs corrosion protection — 47/100, worse than 81% of stainless steel grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
439 TR-1/4H properties
Typical room-temperature values for 439 TR-1/4H; 22 are specific to this condition. Other listed values are 439 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
439 TR-1/4H 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
439 TR-1/4H has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
439 TR-1/4H is rated for continuous service to 815°C (1,499 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
439 TR-1/4H conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (47/100), worse than 81% of stainless steel grades.
Sustainability4
Producing a kilogram of 439 TR-1/4H takes about 50 MJ of energy and emits 3.4 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
439 TR-1/4H's machinability is fair (52/100, better than 91% of stainless steel grades); weldability very good (78/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 439 TR-1/4H
Is 439 easy to machine?
Machines like 430 — soft and slightly gummy; use sharp positive-rake carbide, rigid setups, moderate speed with heavy coolant to avoid built-up edge and work-hardened skin.
Can 439 be welded?
Very good with GTAW/GMAW/laser/resistance methods; Ti stabilization prevents sensitization so no post-weld anneal is normally needed, but keep heat input and interpass temperature low to limit grain coarsening and use 409/439 or 316L filler.
Can 439 be formed, bent or molded?
Good deep-drawing and roll-forming behaviour with low ridging/roping thanks to Ti stabilization; allow for lower elongation and higher springback than 304 and avoid sharp bends across the rolling direction in heavy gauge.
What surface finishes work on 439?
Pickle and passivate after hot work; takes bright-annealed, No.4 brushed and electropolished finishes well, and accepts painting or PVD coatings — do not anodize.
439 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 |
|---|---|---|
| Cextra-low carbon for weld ductility | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0 |
| Cr | 17 – 19 | 17.8 |
| Niresidual | ≤ 0.5 | 0.25 |
| Timin = 0.20 + 4(C+N) stabilization | 0.2 – 1.1 | 0.35 |
| N | ≤ 0.03 | 0.02 |
| Al | ≤ 0.15 | 0.05 |
| Fe | balance | — |
439 TR-1/4H — frequently asked
What is 439 TR-1/4H used for?
439 TR-1/4H is typically used for automotive exhaust manifolds and tubing, solar absorber panels, appliance and water-heater tubing, heat exchanger tubes and shells, catering and kitchen equipment panels and roofing, gutters and cladding. In short: stabilized weldable ferritic stainless.
What is the yield strength of 439 TR-1/4H?
439 TR-1/4H has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 75% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is 439 TR-1/4H easy to machine?
Reasonably — machinability is rated fair (52/100, better than 91% of stainless steel grades). Machines like 430 — soft and slightly gummy; use sharp positive-rake carbide, rigid setups, moderate speed with heavy coolant to avoid built-up edge and work-hardened skin.
Can 439 TR-1/4H be welded?
Yes — weldability is rated very good (78/100). Very good with GTAW/GMAW/laser/resistance methods; Ti stabilization prevents sensitization so no post-weld anneal is normally needed, but keep heat input and interpass temperature low to limit grain coarsening and use 409/439 or 316L filler.
What surface finishes work on 439 TR-1/4H?
Pickle and passivate after hot work; takes bright-annealed, No.4 brushed and electropolished finishes well, and accepts painting or PVD coatings — do not anodize.
Can 439 TR-1/4H be formed, bent or molded?
Good deep-drawing and roll-forming behaviour with low ridging/roping thanks to Ti stabilization; allow for lower elongation and higher springback than 304 and avoid sharp bends across the rolling direction in heavy gauge.
What is the maximum service temperature of 439 TR-1/4H?
439 TR-1/4H 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.
Can FabDigit make parts in 439 TR-1/4H?
Yes — 439 TR-1/4H is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip (UNS S43035) — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic Stainless Steel Tubing (TP439) — ASTM International (2022)
- EN 10088-2 — Stainless steels: technical delivery conditions for sheet/plate (1.4510 X3CrTi17) — CEN (2014)
- GB/T 3280 (022Cr18Ti) — SAC (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- 439 / 1.4510 ferritic stainless steel product data — Outokumpu / Cleveland-Cliffs (AK Steel) (2021)
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.