Stainless Steel 409Cb-TR (Temper Rolled / skin-passed)
Supply condition
UNS S40940
Choose for clip, bracket and clamp strip where slightly higher yield and flatness beat maximum ductility.
Values for the TR condition
Other 409Cb tempers and conditions
409Cb is listed in 3 conditions; see the grade overview at 409Cb.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Standard stocked condition for exhaust sheet, strip and welded tube — maximum ductility and formability. | 255 | 430 | 32 | 150 HB | 2.9 % IACS |
TRThis page Temper Rolled / skin-passed | Choose for clip, bracket and clamp strip where slightly higher yield and flatness beat maximum ductility. | 380 | 480 | 16 | 175 HB | 2.9 % IACS |
Cold Worked 1/4 Hard | Higher-strength strip or cold-drawn tube for stiffness-driven parts; forming must be limited. | 450 | 550 | 9 | 16 HRC | 2.9 % IACS |
What is 409Cb-TR?
409Cb-TR is 409Cb supplied in the TR condition — choose for clip, bracket and clamp strip where slightly higher yield and flatness beat maximum ductility. 409Cb-TR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi). 409Cb-TR has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F). ANN is the default condition FabDigit quotes; TR is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.7 kg CO₂/kg, better than 99% of stainless steel grades
- Easy to machine — 58/100, better than 97% of stainless steel grades
- Conducts heat well — 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Readily welded — 84/100, better than 85% of stainless steel grades
Limitations
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Limited ductility — 16%, worse than 88% of stainless steel grades
- Needs corrosion protection — 44/100, worse than 88% of stainless steel grades
409Cb-TR properties
Typical room-temperature values for 409Cb-TR; 22 are specific to this condition. Other listed values are 409Cb reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
409Cb-TR has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical15
409Cb-TR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
409Cb-TR is rated for continuous service to 760°C (1,400 °F). It conducts heat at 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
409Cb-TR conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (44/100), worse than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of 409Cb-TR takes about 40 MJ of energy and emits 2.7 kg of CO₂ — less than 97% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
409Cb-TR's machinability is good (58/100, better than 97% of stainless steel grades); weldability very good (84/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 409Cb-TR
Is 409Cb easy to machine?
Machines like a soft low-carbon stainless — use sharp, positive-rake tools, rigid setups and generous coolant to avoid built-up edge and work-hardened skin; roughly 65 % of B1112 speed.
Can 409Cb be welded?
Excellent weldability by GTAW/GMAW/laser/HF resistance welding; Nb stabilization prevents weld-decay and keeps HAZ ductility, but keep heat input low to limit grain coarsening and use 409Cb/430Nb or 309L filler.
Can 409Cb be formed, bent or molded?
Good cold formability for stamping, roll forming and tube bending; watch for ridging/roping on deep draws and allow more springback than austenitic grades.
What surface finishes work on 409Cb?
Not anodizable; normally supplied as mill 2B/No.1 finish, and can be aluminized, painted with high-temperature coatings or lightly polished for non-decorative service.
409Cb 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 |
|---|---|---|
| CC+N ≤ 0.045 typical mill practice | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 1 | 0.45 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0 |
| Cr | 10.5 – 11.7 | 11.2 |
| Ni | ≤ 0.5 | 0.25 |
| N | ≤ 0.03 | 0.02 |
| NbNb ≥ 10×C (Cb stabilization); some mills use Nb ≥ 0.30 | 0.17 – 0.75 | 0.35 |
| Tiresidual only in the pure Nb-stabilized version | ≤ 0.15 | 0.02 |
| Fe | balance | — |
409Cb-TR — frequently asked
What is 409Cb-TR used for?
409Cb-TR is typically used for exhaust manifolds, catalytic converter housings and underbody automotive parts. In short: nb-stabilized exhaust ferritic; weldable to 760 °C; nickel-free, low cost.
What is the yield strength of 409Cb-TR?
409Cb-TR has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 409Cb-TR easy to machine?
Reasonably — machinability is rated good (58/100, better than 97% of stainless steel grades). Machines like a soft low-carbon stainless — use sharp, positive-rake tools, rigid setups and generous coolant to avoid built-up edge and work-hardened skin; roughly 65 % of B1112 speed.
Can 409Cb-TR be welded?
Yes — weldability is rated very good (84/100). Excellent weldability by GTAW/GMAW/laser/HF resistance welding; Nb stabilization prevents weld-decay and keeps HAZ ductility, but keep heat input low to limit grain coarsening and use 409Cb/430Nb or 309L filler.
What surface finishes work on 409Cb-TR?
Not anodizable; normally supplied as mill 2B/No.1 finish, and can be aluminized, painted with high-temperature coatings or lightly polished for non-decorative service.
Can 409Cb-TR be formed, bent or molded?
Good cold formability for stamping, roll forming and tube bending; watch for ridging/roping on deep draws and allow more springback than austenitic grades.
What is the maximum service temperature of 409Cb-TR?
409Cb-TR is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 409Cb-ANN and 409Cb-CW14?
ANN is the default condition — standard stocked condition for exhaust sheet, strip and welded tube — maximum ductility and formability. CW14: higher-strength strip or cold-drawn tube for stiffness-driven parts; forming must be limited. Yield strength is 255 MPa in ANN versus 450 MPa in CW14.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip (S40940) — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing — ASTM International (2022)
- SAE J405 / ASTM A959 — Stainless steel designations (UNS S40940) — SAE / ASTM (2020)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- 409Cb / 11 Cr Nb-stabilized ferritic stainless product data — AK Steel / Cleveland-Cliffs, Outokumpu (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.