Stainless Steel 1.4742
EN 1.4742
1.4742 (X10CrAlSi18) is an 18% chromium ferritic heat-resisting steel alloyed with aluminium and silicon so that it builds a protective alumina-rich scale.
Reference datasheet — 1.4742 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 A condition
1.4742 tempers and conditions
1.4742 is supplied in 3 conditions, soft to hard. A 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 |
|---|---|---|---|---|---|---|
Forged + annealed (heavy sections, rings, flanges) | For thick furnace hardware where forged grain flow plus a full anneal restores ductility. | 290 | 590 | 18 | 185 HB | 1.7 % IACS |
ADefault Solution annealed | Standard delivery condition for plate, bar and forgings used as furnace and exhaust hardware. | 300 | 600 | 20 | 180 HB | 1.7 % IACS |
cold drawn bar/wire (as-drawn, not re-annealed) | Choose for close-tolerance bar and fasteners where higher room-temperature strength and better surface are needed. | 540 | 700 | 12 | 225 HB | 1.7 % IACS |
Supply forms, finishes and certifications
Ways 1.4742 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BA-WIRE | Bright annealed wire | Supply form |
1D | Hot rolled, annealed, pickled plate/sheet | Surface finish |
2B | Cold rolled, annealed, pickled, skin-passed sheet/strip | Surface finish |
Peeled | +SH / peeled-ground bar | Coating |
What is 1.4742?
1.4742 (X10CrAlSi18) is an 18% chromium ferritic heat-resisting steel alloyed with aluminium and silicon so that it builds a protective alumina-rich scale. It is chosen for continuous service to about 1000 °C in oxidising furnace atmospheres and is stocked as sheet (1D, 2B), annealed and peeled bar, forged blanks and bright-annealed wire, with 300 MPa yield, 600 MPa tensile, 20% elongation and 180 HB (88 HRB). Limits are low creep strength, grain coarsening and room-temperature embrittlement after hot exposure, restricted weldability, modest machinability (40) and moderate formability (50). Step up to 1.4762 at 25% Cr for 1150 °C duty. 1.4742 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,450°C (2,642 °F). 1.4742 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 220 GPa (31.9 Msi).
What is 1.4742 used for?
- furnace retorts
- burner nozzles
- kiln hardware
- heating elements
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 88% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
1.4742 properties
Typical room-temperature values for 1.4742-A; bars are the position among stainless steel grades.
Physical3
1.4742 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical14
1.4742 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 220 GPa (31.9 Msi).
Thermal6
1.4742 is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 17 W/m·K (9.82 BTU/hr·ft·°F), better than 71% of stainless steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
1.4742 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4742 takes about 52 MJ of energy and emits 3.6 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4742's machinability is fair (40/100, better than 72% of stainless steel grades); weldability fair (40/100); formability fair (50/100).
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. 1.4742 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4742
Is 1.4742 easy to machine?
Machines like 430/446 — gummy and work-hardening; use sharp positive-rake carbide, rigid setup, ~60–90 m/min, heavy feed and flood coolant to avoid rubbing.
Can 1.4742 be welded?
TIG/MIG weldable with austenitic 309/310 or Ni-base filler; preheat 150–250 °C, keep heat input low and post-weld anneal 800 °C where possible — weld metal and HAZ coarsen and lose toughness.
Can 1.4742 be formed, bent or molded?
Cold form with generous bend radii (≥2t) and avoid sharp re-strikes; warm forming 200–300 °C improves ductility; hot work 1100–800 °C then slow-cool/anneal.
1.4742 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 10095 max | ≤ 0.12 | 0.08 |
| Si | 0.7 – 1.4 | 1 |
| Mn | ≤ 1 | 0.5 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0.01 |
| Cr | 17 – 19 | 18 |
| Alforms protective alumina scale | 0.7 – 1.2 | 0.95 |
| Niresidual | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on 1.4742?
Not anodisable; pre-oxidise at service temperature to build the alumina scale, or use silicone/aluminium high-temperature paint; pickle in HNO₃-HF after hot work, abrasive finishes are fine but avoid carbon-steel contamination.
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 1.4742 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X10CrAlSi18
How much does 1.4742 cost?
1.4742 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.
1.4742 — frequently asked
What is 1.4742 used for?
1.4742 is typically used for furnace retorts, burner nozzles, kiln hardware and heating elements. In short: 1000 °C continuous service; alumina-forming ferritic grade; mid-tier Fe-Cr-Al-Si alloy.
What is the yield strength of 1.4742?
1.4742 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4742 easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machines like 430/446 — gummy and work-hardening; use sharp positive-rake carbide, rigid setup, ~60–90 m/min, heavy feed and flood coolant to avoid rubbing.
Can 1.4742 be welded?
With care — weldability is rated fair (40/100). TIG/MIG weldable with austenitic 309/310 or Ni-base filler; preheat 150–250 °C, keep heat input low and post-weld anneal 800 °C where possible — weld metal and HAZ coarsen and lose toughness.
What surface finishes work on 1.4742?
Not anodisable; pre-oxidise at service temperature to build the alumina scale, or use silicone/aluminium high-temperature paint; pickle in HNO₃-HF after hot work, abrasive finishes are fine but avoid carbon-steel contamination.
Can 1.4742 be formed, bent or molded?
Cold form with generous bend radii (≥2t) and avoid sharp re-strikes; warm forming 200–300 °C improves ductility; hot work 1100–800 °C then slow-cool/anneal.
What is the maximum service temperature of 1.4742?
1.4742 is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4742-A and 1.4742-C?
A is the default condition — standard delivery condition for plate, bar and forgings used as furnace and exhaust hardware. C: choose for close-tolerance bar and fasteners where higher room-temperature strength and better surface are needed. Yield strength is 300 MPa in A versus 540 MPa in C.
How much does 1.4742 cost?
1.4742 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
- EN 10095 — Heat resisting steels and nickel alloys — CEN (2018)
- EN 10088-1 — Stainless steels: list of stainless steels — CEN (2014)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Thermax 4742 / X10CrAlSi18 heat-resisting steel datasheet — Deutsche Edelstahlwerke (2020)
- Heat resistant ferritic stainless grades — Outokumpu (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.