Stainless Steel E430Nb
UNS W43011
E430Nb is the niobium-stabilized version of E430 (W43011, E430Nb-16 to GB/T 983), a straight-chromium ferritic electrode in which niobium ties up carbon to improve intergranular corrosion resistance and weld ductility on stabilized ferritic base metals.
Reference datasheet — E430Nb 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 AW condition
E430Nb tempers and conditions
E430Nb is supplied in 5 conditions, soft to hard. AW 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 |
|---|---|---|---|---|---|---|
Post-weld heat treated | Choose when maximum weld ductility, toughness and machinability are required, or when the fabrication code mandates stress relief of ferritic stainless joints. | 340 | 490 | 28 | 170 HB | 2.9 % IACS |
E430Nb-17 | Higher-silica variant of the -16 coating giving a more fluid slag, flatter bead and better wash-in for flat/horizontal fillet welding. | 415 | 535 | 22 | 197 HB | 2.9 % IACS |
AWDefault As-welded deposit | Default condition for AWS A5.4 classification testing and for most field repairs where PWHT is impractical; preheat 150–250 °C and control interpass to limit grain coarsening. | 420 | 540 | 22 | 14 HRC | 2.9 % IACS |
E430Nb-16 | Most widely stocked type (GB/T 983 E430Nb-16); smooth arc, easy slag release and good bead appearance for general fabrication of stabilized ferritic stainless. | 420 | 540 | 22 | 200 HB | 2.9 % IACS |
E430Nb-15 | Pick for lowest weld-metal hydrogen and best toughness on thick or restrained ferritic sections; DC electrode-positive, all-position, slightly rougher bead. | 430 | 550 | 23 | 200 HB | 2.9 % IACS |
What is E430Nb?
E430Nb is the niobium-stabilized version of E430 (W43011, E430Nb-16 to GB/T 983), a straight-chromium ferritic electrode in which niobium ties up carbon to improve intergranular corrosion resistance and weld ductility on stabilized ferritic base metals. It is supplied in -15, -16 and -17 coatings with as-welded and PWHT deposit data, typically 420 MPa yield, 540 MPa tensile and 22 % elongation, service to 800 °C and a corrosion resistance score of 50. The deposit remains ferritic and notch-sensitive at room temperature and usually needs preheat plus a 760–800 °C anneal; unstabilized E430 is the lower-cost option where weld decay is not a risk. E430Nb 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). E430Nb has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
What is E430Nb used for?
- Stabilized ferritic sheet fabrication
- Automotive exhaust flanges
- Appliance panel welding
- Mild chemical exposure equipment
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% 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
Limitations
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Needs corrosion protection — 50/100, worse than 78% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
E430Nb properties
Typical room-temperature values for E430Nb-AW; bars are the position among stainless steel grades.
Physical3
E430Nb 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).
Mechanical17
E430Nb has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
E430Nb is rated for continuous service to 800°C (1,472 °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
E430Nb conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of E430Nb takes about 55 MJ of energy and emits 4.2 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
E430Nb's machinability is fair (45/100, better than 84% of stainless steel grades); weldability good (60/100); formability poor (30/100).
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. E430Nb is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E430Nb
Is E430Nb easy to machine?
Machine the deposit after 760–800 °C anneal; use sharp carbide tooling, rigid setup and positive rake as the as-welded ferrite work-hardens and smears.
Can E430Nb be welded?
Preheat 150–250 °C, keep interpass below ~300 °C, use stringer beads and low heat input, redry electrodes 250–300 °C/1 h, then anneal 760–800 °C and air cool where the code allows.
Can E430Nb be formed, bent or molded?
Not a formable product; the weld bead is deposited to shape — avoid heavy peening or cold straightening of as-welded ferritic joints.
E430Nb 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 |
|---|---|---|
| CAWS A5.4 undiluted weld metal | ≤ 0.1 | 0.05 |
| Cr | 15 – 18 | 16.5 |
| Ni | ≤ 0.6 | 0.3 |
| Mo | ≤ 0.75 | 0.2 |
| Mn | ≤ 1 | 0.6 |
| Siupper end for -17 coating | ≤ 0.9 | 0.5 |
| NbNb(+Ta) stabilizer; some producers specify 10×C min | 0.5 – 1.5 | 0.9 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cu | ≤ 0.75 | 0.1 |
| Fe | balance |
What surface finishes work on E430Nb?
Grind or brush with stainless-only abrasives to remove slag and heat tint, then pickle/passivate to restore the passive Cr oxide; the deposit polishes to a finish close to 430 base metal.
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 E430Nb in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W43011
- Also called
- AWS A5.4 E430Nb-XX
How much does E430Nb cost?
E430Nb is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
E430Nb — frequently asked
What is E430Nb used for?
E430Nb is typically used for stabilized ferritic sheet fabrication, automotive exhaust flanges, appliance panel welding and mild chemical exposure equipment. In short: stabilized ferritic electrode; better weld-decay resistance than E430; anneal for best ductility.
What is the yield strength of E430Nb?
E430Nb has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E430Nb easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% of stainless steel grades). Machine the deposit after 760–800 °C anneal; use sharp carbide tooling, rigid setup and positive rake as the as-welded ferrite work-hardens and smears.
Can E430Nb be welded?
Yes — weldability is rated good (60/100). Preheat 150–250 °C, keep interpass below ~300 °C, use stringer beads and low heat input, redry electrodes 250–300 °C/1 h, then anneal 760–800 °C and air cool where the code allows.
What surface finishes work on E430Nb?
Grind or brush with stainless-only abrasives to remove slag and heat tint, then pickle/passivate to restore the passive Cr oxide; the deposit polishes to a finish close to 430 base metal.
Can E430Nb be formed, bent or molded?
Not a formable product; the weld bead is deposited to shape — avoid heavy peening or cold straightening of as-welded ferritic joints.
What is the maximum service temperature of E430Nb?
E430Nb is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E430Nb-AW and E430Nb PWHT?
AW is the default condition — default condition for AWS A5.4 classification testing and for most field repairs where PWHT is impractical; preheat 150–250 °C and control interpass to limit grain coarsening. PWHT: choose when maximum weld ductility, toughness and machinability are required, or when the fabrication code mandates stress relief of ferritic stainless joints. Yield strength is 420 MPa in AW versus 340 MPa in PWHT.
How much does E430Nb cost?
E430Nb is a premium-cost stainless steel ($$$), cheaper than about 51% 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
- AWS A5.4/A5.4M — Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (ferritic stainless welding) — ASM International (1993)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Stainless covered electrode datasheets (430/430Nb type) — Böhler Welding / ESAB / (2023)
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.