Stainless Steel 1.4417 SA-LT
Certified grade
EN 1.4417 · UNS J93404 · ASTM A890 Grade 5A
SA-LT = solution annealed with low-temperature Charpy qualification
Order this certification level for NORSOK/offshore cryogenic-service valve and pump bodies requiring documented sub-zero toughness.
Values for the SA-LT condition
Other 1.4417 tempers and conditions
1.4417 is listed in 5 conditions; see the grade overview at 1.4417.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Intermediate foundry state only — intermetallic phases and unbalanced ferrite make it brittle and corrosion-prone; must be solution treated before use. | 480 | 620 | 8 | 30 HRC | 2 % IACS |
SADefault Solution annealed 1120–1150 °C + water quench | Standard supply condition for all pressure-retaining super-duplex castings; only condition with the specified corrosion resistance and toughness. | 560 | 760 | 28 | 25 HRC | — |
SA-LTThis page Solution annealed with low-temperature Charpy qualification | Order this certification level for NORSOK/offshore cryogenic-service valve and pump bodies requiring documented sub-zero toughness. | 560 | 760 | 28 | 24 HRC | 2.2 % IACS |
hot isostatically pressed, then solution annealed and quenched | Choose for thick-section subsea/high-integrity valve and pump bodies where microporosity, fatigue life and NDE acceptance are critical. | 575 | 790 | 33 | 26 HRC | 2.2 % IACS |
Centrifugally cast, solution annealed and quenched | For seamless-type rings, sleeves and pipe sections; finer, denser structure gives slightly higher strength than static castings. | 585 | 790 | 26 | 26 HRC | 2.2 % IACS |
What is 1.4417 SA-LT?
1.4417 SA-LT is 1.4417 in a SA-LT certified grade — order this certification level for NORSOK/offshore cryogenic-service valve and pump bodies requiring documented sub-zero toughness. 1.4417 SA-LT has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 195 GPa (28.3 Msi). 1.4417 SA-LT has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; SA-LT is available on request or by drawing note.
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 560 MPa (81.2 ksi), better than 85% of stainless steel grades
Limitations
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited formability — 20/100, worse than 86% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
1.4417 SA-LT properties
Typical room-temperature values for 1.4417 SA-LT; 23 are specific to this condition. Other listed values are 1.4417 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4417 SA-LT has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
1.4417 SA-LT has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4417 SA-LT is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
1.4417 SA-LT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4417 SA-LT takes about 60 MJ of energy and emits 4.6 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
1.4417 SA-LT's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (60/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4417 SA-LT
Is 1.4417 easy to machine?
Machine like super duplex: rigid setup, sharp positive-rake carbide or coated inserts, low speed (~50–80 m/min) with heavy feed and flood coolant to cut under the work-hardened layer; avoid dwelling.
Can 1.4417 be welded?
GTAW/GMAW/SMAW with over-alloyed 25.10.4L (E/ER2594) filler, Ar+2 %N₂ shielding, interpass ≤150 °C, 0.5–2.0 kJ/mm heat input; major repairs should be followed by full re-solution and water quench.
Can 1.4417 be formed, bent or molded?
Sand or investment cast with generous risering (high shrinkage, low fluidity); always solution treat 1120–1150 °C and water quench to dissolve σ/χ and rebalance ferrite to ~40–60 %.
What surface finishes work on 1.4417?
Pickle and passivate (HNO₃-HF) after heat treatment to remove scale; glass-bead or electropolish for hygienic surfaces — no anodizing, and avoid iron-contaminating abrasives.
1.4417 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 |
|---|---|---|
| Clow-carbon cast grade | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | 0.03 |
| SNORSOK orders typically ≤0.010 | ≤ 0.04 | 0.01 |
| CrEN 10283 allows 24.5–26.5 | 24 – 26 | 25 |
| Ni | 6 – 8 | 7 |
| MoEN 1.4417 nominally 3–4 %; ASTM A890/A995 Gr 5A requires 4.0–5.0 % | 3 – 5 | 4.2 |
| N | 0.1 – 0.3 | 0.2 |
| Curesidual | ≤ 1 | 0.3 |
| Fe | balance | — |
1.4417 SA-LT — frequently asked
What is 1.4417 SA-LT used for?
1.4417 SA-LT is typically used for subsea valve bodies, high-chloride pump casings and offshore manifolds. In short: cast super duplex 2507; highest chloride pitting resistance; 560 MPa cast yield.
What is the yield strength of 1.4417 SA-LT?
1.4417 SA-LT has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 85% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4417 SA-LT easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machine like super duplex: rigid setup, sharp positive-rake carbide or coated inserts, low speed (~50–80 m/min) with heavy feed and flood coolant to cut under the work-hardened layer; avoid dwelling.
Can 1.4417 SA-LT be welded?
Yes — weldability is rated good (60/100). GTAW/GMAW/SMAW with over-alloyed 25.10.4L (E/ER2594) filler, Ar+2 %N₂ shielding, interpass ≤150 °C, 0.5–2.0 kJ/mm heat input; major repairs should be followed by full re-solution and water quench.
What surface finishes work on 1.4417 SA-LT?
Pickle and passivate (HNO₃-HF) after heat treatment to remove scale; glass-bead or electropolish for hygienic surfaces — no anodizing, and avoid iron-contaminating abrasives.
Can 1.4417 SA-LT be formed, bent or molded?
Sand or investment cast with generous risering (high shrinkage, low fluidity); always solution treat 1120–1150 °C and water quench to dissolve σ/χ and rebalance ferrite to ~40–60 %.
What is the maximum service temperature of 1.4417 SA-LT?
1.4417 SA-LT is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4417-SA and 1.4417-AC?
SA is the default condition — standard supply condition for all pressure-retaining super-duplex castings; only condition with the specified corrosion resistance and toughness. AC: intermediate foundry state only — intermetallic phases and unbalanced ferrite make it brittle and corrosion-prone; must be solution treated before use. Yield strength is 560 MPa in SA versus 480 MPa in AC.
Sources
- ASTM A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex — ASTM International (2023)
- ASTM A995/A995M — Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts — ASTM International (2020)
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- SAF 2507 / Outokumpu 2507 super duplex datasheet — Sandvik / Outokumpu (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- NORSOK M-650 / M-630 material data sheets for duplex castings — Standards Norway (2020)
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.