Stainless Steel 434
AISI/SAE 434 · UNS S43400 · EN 1.4113, X6CrMo17-1 · JIS SUS434 · GB 10Cr17Mo
434 is a molybdenum-bearing 17% Cr ferritic stainless (S43400, 1.4113, X6CrMo17-1) in which the Mo addition raises pitting resistance above 430 while keeping the low-nickel ferritic cost base.
Values for the Annealed condition
434 tempers and conditions
434 is supplied in 4 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed / cold rolled and annealed sheet, plate, bar | Default stocked condition: softest, maximum ductility for deep drawing, bending and roll forming. | 365 | 530 | 25 | 160 HB | — |
Quarter hard | Light temper rolling for extra stiffness and flatness in panels that need only modest bending. | 500 | 620 | 14 | 13 HRC | — |
cold drawn / cold finished bar and wire | Bar and wire condition giving tighter tolerances, better surface and higher strength for machined fasteners and shafts. | 510 | 620 | 15 | 15 HRC | — |
Half hard | Higher-strength spring-like strip for clips and stiff brackets where only simple forming is required. | 620 | 725 | 8 | 22 HRC | — |
Supply forms, finishes and certifications
Ways 434 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
2B | Cold rolled, annealed, pickled and lightly skin-passed sheet | Surface finish |
BA | Bright annealed (2BA) cold rolled sheet | Surface finish |
HRAP | Hot rolled, annealed and pickled plate/coil | Surface finish |
What is 434?
434 is a molybdenum-bearing 17% Cr ferritic stainless (S43400, 1.4113, X6CrMo17-1) in which the Mo addition raises pitting resistance above 430 while keeping the low-nickel ferritic cost base. It is used mainly as sheet and strip in 2B, BA, HRAP, annealed, cold-drawn and 1/4- to 1/2-hard tempers, with 365 MPa yield, 530 MPa tensile, 25% elongation and 160 HB in the default condition, and it tolerates service to 760 °C. Weld-zone toughness is the main limit because 434 is unstabilized and the HAZ coarsens; formability (score 70) is below austenitic 304. Choose niobium-stabilized 436 or titanium-stabilized 439 where welded parts must stay ductile. 434 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). 434 has a yield strength of 365 MPa (52.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
What is 434 used for?
- Automotive exterior trim and bright mouldings
- Solar water heater panels and tanks
- Appliance panels and fascias
- Kitchen and catering equipment panels
- Roofing and cladding sheet in mild chloride exposure
- Automotive wheel covers and mirror housings
- Hot-water and heating component shells
Advantages
- Easy to machine — 55/100, better than 94% of stainless steel grades
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- High electrical conductivity — 2.6 % IACS, better than 77% of stainless steel grades
Limitations
- Needs corrosion protection — 52/100, worse than 76% of stainless steel grades
434 properties
Typical room-temperature values for 434-Annealed; bars are the position among stainless steel grades.
Physical3
434 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).
Mechanical14
434 has a yield strength of 365 MPa (52.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 51% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
434 is rated for continuous service to 760°C (1,400 °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
434 conducts electricity at 2.6 % IACS, better than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 76% of stainless steel grades.
Sustainability4
Producing a kilogram of 434 takes about 50 MJ of energy and emits 4 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
434's machinability is good (55/100, better than 94% of stainless steel grades); weldability good (55/100); formability very good (70/100).
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. 434 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 434
Is 434 easy to machine?
Machines like 430 (≈55% of AISI 1212): use rigid setups, sharp positive-rake carbide, moderate speed with heavy positive feed and flood coolant to avoid work hardening and built-up edge.
Can 434 be welded?
Readily GTAW/GMAW/resistance welded, but keep heat input low and avoid preheat/interpass above ~200 °C; HAZ grain coarsening lowers toughness — use 316L or 430Nb-type filler and post-weld anneal (760–815 °C) where ductility matters.
Can 434 be formed, bent or molded?
Good cold formability in the annealed condition for deep drawing and roll forming; springback is lower than austenitics, but plan for possible ridging/roping on drawn faces and avoid tight bends on transverse-oriented cold-worked strip.
Manufacturability
The process limits FabDigit applies to 434. Every 434 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Better70 / 100 |
|---|---|
| Weldability | Fair55 / 100 |
| Bendable | Yes |
434 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 |
|---|---|---|
| C | ≤ 0.12 | 0.05 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 1 | 0.5 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.01 |
| Cr | 16 – 18 | 17 |
| Mo | 0.75 – 1.25 | 1 |
| Fe | balance |
What surface finishes work on 434?
Takes a bright mechanical or electropolished finish and is commonly supplied BA for trim; passivate after machining/welding, and use PVD or clear coat rather than anodizing.
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).
Plating
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 434 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S43400
- EN / DIN / Werkstoff-Nr.
- 1.4113X6CrMo17-1
- GB (China)
- 10Cr17Mo
- JIS
- SUS434
How much does 434 cost?
434 is a premium-cost stainless steel ($$$), cheaper than about 58% 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.
434 — frequently asked
What is 434 used for?
434 is typically used for automotive exterior trim and bright mouldings, solar water heater panels and tanks, appliance panels and fascias, kitchen and catering equipment panels, roofing and cladding sheet in mild chloride exposure and automotive wheel covers and mirror housings. In short: molybdenum-bearing ferritic stainless.
What is the yield strength of 434?
434 has a typical yield strength of 365 MPa (52.9 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 51% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 434 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like 430 (≈55% of AISI 1212): use rigid setups, sharp positive-rake carbide, moderate speed with heavy positive feed and flood coolant to avoid work hardening and built-up edge.
Can 434 be welded?
Yes — weldability is rated good (55/100). Readily GTAW/GMAW/resistance welded, but keep heat input low and avoid preheat/interpass above ~200 °C; HAZ grain coarsening lowers toughness — use 316L or 430Nb-type filler and post-weld anneal (760–815 °C) where ductility matters.
What surface finishes work on 434?
Takes a bright mechanical or electropolished finish and is commonly supplied BA for trim; passivate after machining/welding, and use PVD or clear coat rather than anodizing.
Can 434 be formed, bent or molded?
Good cold formability in the annealed condition for deep drawing and roll forming; springback is lower than austenitics, but plan for possible ridging/roping on drawn faces and avoid tight bends on transverse-oriented cold-worked strip.
What is the maximum service temperature of 434?
434 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.
How much does 434 cost?
434 is a premium-cost stainless steel ($$$), cheaper than about 58% 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.
Can FabDigit make parts in 434?
Yes — 434 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 A176 — Stainless and Heat-Resisting Chromium Steel Plate, Sheet, and Strip — ASTM International (2022)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Ferritic stainless steel grade datasheets (17Cr-1Mo / 434) — Outokumpu / AK Steel (Cleveland-Cliffs) (2021)
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.