Stainless Steel 429 CR-2B
Finish state
AISI/SAE 429 · UNS S42900
Standard thin-gauge sheet condition for stamped trim, catalytic-converter shells and appliance panels.
Values for the CR-2B condition
Other 429 tempers and conditions
429 is listed in 3 conditions; see the grade overview at 429.
- Annealed
- CR-2B
- Cold Drawn
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault 760–830 °C anneal, air or slow cooled | Standard supply condition for sheet, plate, bar and tube; best formability and toughness. | 310 | 490 | 30 | 160 HB | — |
CR-2BThis page 2B | Standard thin-gauge sheet condition for stamped trim, catalytic-converter shells and appliance panels. | 320 | 500 | 30 | 165 HB | 2.9 % IACS |
cold finished bar/wire (annealed then drawn) | Pick for machined fasteners, shafts and screw-machine parts needing closer tolerance and higher strength. | 520 | 620 | 15 | 14 HRC | 2.9 % IACS |
What is 429 CR-2B?
429 CR-2B is 429 supplied in the CR-2B condition — standard thin-gauge sheet condition for stamped trim, catalytic-converter shells and appliance panels. 429 CR-2B has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). 429 CR-2B 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). Annealed is the default condition FabDigit quotes; CR-2B is available on request or by drawing note.
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Easy to machine — 50/100, better than 90% 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 — 45/100, worse than 85% of stainless steel grades
429 CR-2B properties
Typical room-temperature values for 429 CR-2B; 22 are specific to this condition. Other listed values are 429 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
429 CR-2B 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 CR-2B has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
429 CR-2B 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 CR-2B conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 429 CR-2B 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 CR-2B's machinability is fair (50/100, better than 90% of stainless steel grades); weldability good (62/100); formability good (68/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 429 CR-2B
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 CR-2B — frequently asked
What is 429 CR-2B used for?
429 CR-2B 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 CR-2B?
429 CR-2B has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 60% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 429 CR-2B easy to machine?
Reasonably — machinability is rated fair (50/100, better than 90% 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 CR-2B be welded?
Yes — weldability is rated good (62/100). 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 CR-2B?
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 CR-2B 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 CR-2B?
429 CR-2B 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 CR-2B?
Annealed is the default condition — standard supply condition for sheet, plate, bar and tube; best formability and toughness. CR-2B: standard thin-gauge sheet condition for stamped trim, catalytic-converter shells and appliance panels. Yield strength is 310 MPa in Annealed versus 320 MPa in CR-2B.
Can FabDigit make parts in 429 CR-2B?
Yes — 429 CR-2B is available for 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 — 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.