Stainless Steel 429 · temper · default condition
Stainless Steel 429 Annealed
Properties of the Annealed condition, compared with the other 429 tempers.
Standard supply condition for sheet, plate, bar and tube; best formability and toughness.
What is 429 Annealed?
429 Annealed is 429 in the Annealed temper — standard supply condition for sheet, plate, bar and tube; best formability and toughness. 429 Annealed has a yield strength of 310 MPa (45 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). 429 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,427°C (2,601 °F).
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Easy to machine — 52/100, better than 92% of stainless steel grades
- Low embodied carbon — 3.5 kg CO₂/kg, better than 88% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
Limitations
- Needs corrosion protection — 43/100, worse than 88% of stainless steel grades
429 Annealed properties
Typical room-temperature values for 429 Annealed — 11 properties are specific to this condition; the rest are grade-level values shared by every 429 temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.
Physical3
429 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,427°C (2,601 °F).
Mechanical13
429 Annealed has a yield strength of 310 MPa (45 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
429 Annealed is rated for continuous service to 815°C (1,499 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
429 Annealed conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (43/100), worse than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of 429 Annealed takes about 47 MJ of energy and emits 3.5 kg of CO₂ — less than 87% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
429 Annealed's machinability is fair (52/100, better than 92% of stainless steel grades); weldability good (60/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 429 tempers and conditions
429 is also supplied in 3 other conditions. The full side-by-side table is on the 429 overview.
- AnnealedDefaultStandard supply condition for sheet, plate, bar and tube; best formability and toughness.310 MPa yield · 160 HB
- Cold DrawnPick for machined fasteners, shafts and screw-machine parts needing closer tolerance and higher strength.520 MPa yield · 200 HB
Working with 429 Annealed
Is 429 easy to machine?
Machines like 430 at ~55 % of AISI 1212 — use rigid setups, sharp positive-rake carbide, heavy feeds and flood coolant to avoid work-hardened glazing and stringy chips.
Can 429 be welded?
Readily welded by GTAW/GMAW/resistance methods with 430 or 309L filler; keep heat input low and consider 750–800 °C post-weld anneal to restore weld-HAZ ductility.
Can 429 be formed, bent or molded?
Good deep-drawing and roll-forming in the annealed condition, though springback is higher and stretch-formability lower than austenitic 304; avoid tight bends transverse to rolling on heavy gauge.
What surface finishes work on 429?
Passivate in nitric or citric acid (ASTM A967) after machining; takes a bright polish or brushed finish, and can be electropolished — no anodizing.
429 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 A240 / A276 | ≤ 0.12 | 0.06 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Crlower Cr than 430 improves weld ductility | 14 – 16 | 15 |
| Niresidual limit | ≤ 0.75 | 0.3 |
| Fe | balance | — |
429 Annealed — frequently asked
What is 429 Annealed used for?
429 Annealed is typically used for hot water heater tanks and liners, automotive trim, welded tube and pipe, furnace and heat-resistant fixtures, appliance panels and housings and heat exchanger components in mild environments. In short: furnace-grade ferritic stainless.
What is the yield strength of 429 Annealed?
429 Annealed has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 63% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 429 Annealed easy to machine?
Reasonably — machinability is rated fair (52/100, better than 92% of stainless steel grades). Machines like 430 at ~55 % of AISI 1212 — use rigid setups, sharp positive-rake carbide, heavy feeds and flood coolant to avoid work-hardened glazing and stringy chips.
Can 429 Annealed be welded?
Yes — weldability is rated good (60/100). Readily welded by GTAW/GMAW/resistance methods with 430 or 309L filler; keep heat input low and consider 750–800 °C post-weld anneal to restore weld-HAZ ductility.
What surface finishes work on 429 Annealed?
Passivate in nitric or citric acid (ASTM A967) after machining; takes a bright polish or brushed finish, and can be electropolished — no anodizing.
Can 429 Annealed be formed, bent or molded?
Good deep-drawing and roll-forming in the annealed condition, though springback is higher and stretch-formability lower than austenitic 304; avoid tight bends transverse to rolling on heavy gauge.
What is the maximum service temperature of 429 Annealed?
429 Annealed 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.
What is the difference between 429 Annealed and 429 HRAP?
Annealed is the default condition — standard supply condition for sheet, plate, bar and tube; best formability and toughness. HRAP: choose for heavier plate and welded vessel parts where surface finish is not critical. Yield strength is 310 MPa in Annealed versus 300 MPa in HRAP.
Can FabDigit make parts in 429 Annealed?
Yes — 429 Annealed is available for sheet metal with instant online pricing. 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 — ASTM International (2023)
- ASTM A276/A276M — Stainless Steel Bars and Shapes — ASTM International (2023)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- SAE J405 / UNS S42900 chemical composition — SAE International (2013)
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.