Stainless Steel 1.4002
EN 1.4002 · UNS S40500 · AISI/SAE 405
1.4002 (X6CrAl13, UNS S40500, AISI 405) is an aluminium-stabilized 13Cr ferritic stainless steel in which the Al addition suppresses air-hardening martensite in the heat-affected zone, making it the weld-friendly member of the 13Cr family.
Reference datasheet — 1.4002 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 Annealed condition
1.4002 tempers and conditions
1.4002 is supplied in 3 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Applied to heavy welded fabrications to relieve residual stress and restore HAZ ductility. | 225 | 455 | 25 | 150 HB | 2.9 % IACS |
AnnealedDefault Annealed (softened, ~780–830 °C, air/furnace cooled) | Standard stocked condition for plate, sheet, bar and tube; maximum ductility and best weld/form behaviour. | 230 | 460 | 26 | 150 HB | — |
Cold drawn | Bar/wire condition with tighter tolerances and higher strength; ductility and formability drop. | 420 | 560 | 15 | 11 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways 1.4002 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
1D | Hot rolled, annealed, pickled plate/sheet | Surface finish |
2B | Cold rolled, annealed, pickled, skin-passed sheet | Surface finish |
2R | 2R / BA | Surface finish |
What is 1.4002?
1.4002 (X6CrAl13, UNS S40500, AISI 405) is an aluminium-stabilized 13Cr ferritic stainless steel in which the Al addition suppresses air-hardening martensite in the heat-affected zone, making it the weld-friendly member of the 13Cr family. It is chosen for welded pressure equipment and furnace hardware and is supplied as annealed plate (1D), cold-rolled sheet (2B, 2R), cold-drawn (CD) and stress-relieved (SR) bar, with typical properties of 230 MPa yield, 460 MPa tensile, 26 % elongation, 150 HB and service to 700 °C. Corrosion resistance is limited to mild environments and formability (score 60) is modest, so use 1.4016/430 for appearance-critical or more corrosive work and 1.4003 for structural plate. 1.4002 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,480°C (2,696 °F). 1.4002 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 99% of stainless steel grades. Elongation at break is 26% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4002 used for?
- welded pressure vessels
- heat exchangers
- furnace components
Advantages
- Conducts heat well — 27 W/m·K (15.6 BTU/hr·ft·°F), better than 97% of stainless steel grades
- Easy to machine — 55/100, better than 94% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Low strength — 230 MPa (33.4 ksi), worse than 99% of stainless steel grades
- Needs corrosion protection — 42/100, worse than 90% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
1.4002 properties
Typical room-temperature values for 1.4002-Annealed; bars are the position among stainless steel grades.
Physical3
1.4002 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,480°C (2,696 °F).
Mechanical14
1.4002 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 99% of stainless steel grades. Elongation at break is 26% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4002 is rated for continuous service to 700°C (1,292 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), better than 97% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
1.4002 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4002 takes about 50 MJ of energy and emits 3.6 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4002's machinability is good (55/100, better than 94% of stainless steel grades); weldability very good (78/100); formability good (60/100).
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. 1.4002 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4002
Is 1.4002 easy to machine?
Machines like annealed 410 but gummier — use sharp positive-rake carbide, rigid setups, 60–100 m/min, generous coolant, and avoid dwelling to prevent work-hardened skin.
Can 1.4002 be welded?
Best-in-class among 13Cr grades: Al stabilization prevents HAZ martensite so preheat is often unnecessary; use 405/430 or austenitic 309L/308L filler, low heat input, and PWHT at 730–790 °C on heavy sections to limit grain-coarsening embrittlement.
Can 1.4002 be formed, bent or molded?
Cold form in the annealed condition with generous bend radii (≥1.5t) and allowance for ~15–20 % springback; hot work at 800–1050 °C then anneal, and avoid holding at 400–550 °C (475 °C embrittlement).
1.4002 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 |
|---|---|---|
| CEN 10088-2 max 0.08 | ≤ 0.08 | 0.05 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.5 |
| P | ≤ 0.04 | 0.03 |
| SASTM A240 grade 405 allows S ≤ 0.030 | ≤ 0.02 | 0.01 |
| CrASTM 405: 11.5–14.5 | 12 – 14 | 13 |
| Alferrite stabilizer, suppresses HAZ hardening | 0.1 – 0.3 | 0.2 |
| NiASTM A240 limit; not specified in EN 10088-2 | ≤ 0.6 | 0.3 |
| Fe | balance |
What surface finishes work on 1.4002?
Passivate per ASTM A967 or pickle after welding to restore the chromium oxide film; takes brushed and mirror finishes less brightly than 430, and is commonly painted or aluminized for furnace service.
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 1.4002 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S40500
- AISI / SAE
- 405
- EN / DIN / Werkstoff-Nr.
- X6CrAl13
How much does 1.4002 cost?
1.4002 is a standard-cost stainless steel ($$), cheaper than about 71% 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.
1.4002 — frequently asked
What is 1.4002 used for?
1.4002 is typically used for welded pressure vessels, heat exchangers and furnace components. In short: most weldable 13Cr grade; al-stabilized, no HAZ martensite; pressure-vessel ferritic stainless.
What is the yield strength of 1.4002?
1.4002 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 99% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4002 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like annealed 410 but gummier — use sharp positive-rake carbide, rigid setups, 60–100 m/min, generous coolant, and avoid dwelling to prevent work-hardened skin.
Can 1.4002 be welded?
Yes — weldability is rated very good (78/100). Best-in-class among 13Cr grades: Al stabilization prevents HAZ martensite so preheat is often unnecessary; use 405/430 or austenitic 309L/308L filler, low heat input, and PWHT at 730–790 °C on heavy sections to limit grain-coarsening embrittlement.
What surface finishes work on 1.4002?
Passivate per ASTM A967 or pickle after welding to restore the chromium oxide film; takes brushed and mirror finishes less brightly than 430, and is commonly painted or aluminized for furnace service.
Can 1.4002 be formed, bent or molded?
Cold form in the annealed condition with generous bend radii (≥1.5t) and allowance for ~15–20 % springback; hot work at 800–1050 °C then anneal, and avoid holding at 400–550 °C (475 °C embrittlement).
What is the maximum service temperature of 1.4002?
1.4002 is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4002 Annealed and 1.4002-CD?
Annealed is the default condition — standard stocked condition for plate, sheet, bar and tube; maximum ductility and best weld/form behaviour. CD: bar/wire condition with tighter tolerances and higher strength; ductility and formability drop. Yield strength is 230 MPa in Annealed versus 420 MPa in CD.
How much does 1.4002 cost?
1.4002 is a standard-cost stainless steel ($$), cheaper than about 71% 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
- EN 10088-1/-2 Stainless steels — list of grades and technical delivery conditions for sheet/plate/strip — CEN (2014)
- 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 Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- GB/T 1220 / GB/T 4237 (0Cr13Al ) (2016)
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.