Stainless Steel S44725
UNS S44725
S44725 is a titanium/niobium-stabilized 29Cr-4Mo super-ferritic stainless steel related to the 29-4C family, offered as annealed and bright-annealed sheet, cold-rolled temper strip, welded-annealed tube and as-welded product.
Reference datasheet — S44725 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
S44725 tempers and conditions
S44725 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 |
|---|---|---|---|---|---|---|
As-welded deposit | Use these values to assess field-welded GTAW joints without PWHT: Ti/Nb stabilization keeps intergranular attack low, but HAZ grain coarsening cuts toughness to 18 % elongation. | 450 | 600 | 18 | 190 HB | 2.4 % IACS |
AnnealedDefault mill annealed ( / / , ) | Pick this most-stocked state — annealed at 1010–1065 °C, rapidly cooled and pickled — for heat-exchanger tubing and sheet work balancing corrosion resistance with forming. | 480 | 620 | 27 | 180 HB | 2.4 % IACS |
light cold work | Use light cold rolling after annealing to lift yield to 620 MPa and improve flatness on stiff or springy thin-gauge parts; toughness and formability fall to 14 % elongation. | 620 | 720 | 14 | 21 HRC | 2.4 % IACS |
Supply forms, finishes and certifications
Ways S44725 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Welded-Annealed-Tube | Welded & Annealed Tube | Supply form |
BA | Bright annealed strip/tube | Surface finish |
What is S44725?
S44725 is a titanium/niobium-stabilized 29Cr-4Mo super-ferritic stainless steel related to the 29-4C family, offered as annealed and bright-annealed sheet, cold-rolled temper strip, welded-annealed tube and as-welded product. Stabilization keeps weld and HAZ toughness usable while retaining high chloride pitting and crevice corrosion resistance, with 480 MPa yield, 620 MPa tensile, 27 % elongation and service to 400 °C. Thick sections remain toughness-limited, welding needs strict inert shielding, and mill availability is narrow. S44700 is the unstabilized equivalent. S44725 has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,420°C (2,588 °F). S44725 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
What is S44725 used for?
- seawater equipment
- chemical process piping
- heat exchangers
Advantages
- Good corrosion resistance — 82/100, better than 90% of stainless steel grades
- High strength — 480 MPa (69.6 ksi), better than 75% of stainless steel grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
S44725 properties
Typical room-temperature values for S44725-Annealed; bars are the position among stainless steel grades.
Physical3
S44725 has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
S44725 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44725 is rated for continuous service to 400°C (752 °F). It conducts heat at 16.5 W/m·K (9.53 BTU/hr·ft·°F), better than 70% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
S44725 conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of S44725 takes about 62 MJ of energy and emits 5.5 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
S44725's machinability is fair (40/100, better than 72% of stainless steel grades); weldability good (55/100); formability good (55/100).
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. S44725 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S44725
Is S44725 easy to machine?
Run lower speeds with heavy feeds in rigid fixtures; the high Mo content promotes tool adhesion and flank wear. Use coated carbide with ample emulsion coolant at roughly 70 % of the cutting speed used for 304.
Can S44725 be welded?
Autogenous GTAW or a Ni-base filler such as ERNiCrMo-3 is recommended, with strict inert gas shielding including argon backing, low heat input and interpass temperature at or below 150 °C. Avoid heavy sections to prevent coarse-grain HAZ embrittlement.
Can S44725 be formed, bent or molded?
Cold bending, roll forming and light stretch forming are practical; use bend radii of 2t or more and bend along the rolling direction. Deep drawing capability is limited and springback exceeds austenitic steels, so avoid excessive cold work.
S44725 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, with Ti/Nb stabilization | ≤ 0.03 | 0.02 |
| Cr | 28 – 30 | 29 |
| Mo | 3.6 – 4.2 | 3.9 |
| Ni | ≤ 1 | 0.3 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.4 |
| N | ≤ 0.05 | 0.02 |
| Ti+Nbtotal stabilizers, usually required ≥6×(C+N) | 0.2 – 1 | 0.5 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Curesidual element, limited by some specifications | ≤ 0.5 | |
| Febalance; per 29Cr-4Mo stabilized group (S44735/29-4C); verify heat | balance |
What surface finishes work on S44725?
Nitric-acid pickling and passivation or electropolishing restores the passive film. It can be mechanically polished to a mirror finish; avoid chloride-bearing cleaners and carbon steel tooling to prevent iron 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
How much does S44725 cost?
S44725 is a high-cost stainless steel ($$$$), pricier than about 78% 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.
S44725 — frequently asked
What is S44725 used for?
S44725 is typically used for seawater equipment, chemical process piping and heat exchangers. In short: stabilized 29Cr-4Mo ferritic; better weld toughness than S44700; 400 °C service ceiling.
What is the yield strength of S44725?
S44725 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 75% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44725 easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Run lower speeds with heavy feeds in rigid fixtures; the high Mo content promotes tool adhesion and flank wear. Use coated carbide with ample emulsion coolant at roughly 70 % of the cutting speed used for 304.
Can S44725 be welded?
Yes — weldability is rated good (55/100). Autogenous GTAW or a Ni-base filler such as ERNiCrMo-3 is recommended, with strict inert gas shielding including argon backing, low heat input and interpass temperature at or below 150 °C. Avoid heavy sections to prevent coarse-grain HAZ embrittlement.
What surface finishes work on S44725?
Nitric-acid pickling and passivation or electropolishing restores the passive film. It can be mechanically polished to a mirror finish; avoid chloride-bearing cleaners and carbon steel tooling to prevent iron contamination.
Can S44725 be formed, bent or molded?
Cold bending, roll forming and light stretch forming are practical; use bend radii of 2t or more and bend along the rolling direction. Deep drawing capability is limited and springback exceeds austenitic steels, so avoid excessive cold work.
What is the maximum service temperature of S44725?
S44725 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S44725 Annealed and S44725-AW?
Annealed is the default condition — pick this most-stocked state — annealed at 1010–1065 °C, rapidly cooled and pickled — for heat-exchanger tubing and sheet work balancing corrosion resistance with forming. AW: use these values to assess field-welded GTAW joints without PWHT: Ti/Nb stabilization keeps intergranular attack low, but HAZ grain coarsening cuts toughness to 18 % elongation. Yield strength is 480 MPa in Annealed versus 450 MPa in AW.
How much does S44725 cost?
S44725 is a high-cost stainless steel ($$$$), pricier than about 78% 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
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic Stainless Steel Tubing — ASTM International (2022)
- ASTM A803/A803M — Welded Ferritic Stainless Steel Feedwater Heater Tubes — ASTM International (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.