Stainless Steel 1.4742-A (Solution annealed)
Temper · default condition
EN 1.4742
Standard delivery condition for plate, bar and forgings used as furnace and exhaust hardware.
Values for the A condition
Other 1.4742 tempers and conditions
1.4742 is listed in 3 conditions; see the grade overview at 1.4742.
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 |
ADefaultThis page 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 |
What is 1.4742-A?
1.4742-A is 1.4742 in the A temper — standard delivery condition for plate, bar and forgings used as furnace and exhaust hardware. 1.4742-A 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). 1.4742-A 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).
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-A properties
Typical room-temperature values for 1.4742-A; 20 are specific to this condition. Other listed values are 1.4742 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4742-A 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-A 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-A 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-A 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-A 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-A'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. Confirm any required mill or lot documentation when quoting.
Working with 1.4742-A
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.
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.
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 | — |
1.4742-A — frequently asked
What is 1.4742-A used for?
1.4742-A 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-A?
1.4742-A 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-A 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-A 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-A?
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-A 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-A?
1.4742-A 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.