Stainless Steel S41045 1/4H
Supply condition
UNS S41045
1/4H = quarter hard
Light temper roll for extra stiffness/flatness in flat panels and roll-formed sections with modest bending.
Values for the 1/4H condition
Other S41045 tempers and conditions
S41045 is listed in 7 conditions; see the grade overview at S41045.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed, descaled (ferritic condition) | Default stocked condition: softest, most weldable and formable state for plate, sheet, bar and tube. | 310 | 480 | 28 | 170 HB | — |
As-welded deposit | Reference condition for fabrications left as welded; low carbon plus stabilization keeps HAZ hardness and sensitization low. | 320 | 490 | 20 | 14 HRC | 3 % IACS |
Normalized and tempered | For heavier sections/tube where any transformed martensite from air cooling is tempered back for toughness and uniform hardness. | 360 | 550 | 22 | 11 HRC | 3 % IACS |
1/4HThis page Quarter hard | Light temper roll for extra stiffness/flatness in flat panels and roll-formed sections with modest bending. | 450 | 550 | 12 | 13 HRC | 3 % IACS |
Cold drawn | Bar and wire condition giving closer tolerance, better surface and higher yield for machined shafts and fasteners. | 500 | 600 | 15 | 16 HRC | 3 % IACS |
Half hard | Use where spring-back stiffness or higher yield is required and forming is limited to gentle bends. | 550 | 620 | 8 | 20 HRC | 3 % IACS |
Full hard | Strip condition for flat springs, clamps and wear strips where no forming beyond slight bending is needed. | 650 | 720 | 4 | 25 HRC | 3 % IACS |
What is S41045 1/4H?
S41045 1/4H is S41045 supplied in the 1/4H condition — light temper roll for extra stiffness/flatness in flat panels and roll-formed sections with modest bending. S41045 1/4H has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 200 GPa (29 Msi). S41045 1/4H 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). Annealed is the default condition FabDigit quotes; 1/4H is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.9 kg CO₂/kg, better than 98% of stainless steel grades
- High electrical conductivity — 3 % IACS, better than 95% of stainless steel grades
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Easy to machine — 48/100, better than 88% of stainless steel grades
Limitations
- Limited ductility — 12%, worse than 95% of stainless steel grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 91% 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
S41045 1/4H properties
Typical room-temperature values for S41045 1/4H; 23 are specific to this condition. Other listed values are S41045 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S41045 1/4H 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).
Mechanical16
S41045 1/4H has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S41045 1/4H is rated for continuous service to 500°C (932 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
S41045 1/4H conducts electricity at 3 % IACS, better than 95% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of S41045 1/4H takes about 33 MJ of energy and emits 2.9 kg of CO₂ — less than 100% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
S41045 1/4H's machinability is fair (48/100, better than 88% of stainless steel grades); weldability good (65/100); formability fair (42/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S41045 1/4H
Is S41045 easy to machine?
Machines like annealed 410 (~55 % of 1212): rigid setups, sharp positive-rake carbide, moderate speed and heavy feed to avoid work-hardened glazing; stabilized carbides/nitrides are mildly abrasive.
Can S41045 be welded?
Readily welded by GMAW/GTAW/SMAW/SAW without preheat in thin gauges; use austenitic 309L/308L filler for ductile welds, keep heat input low to limit HAZ grain coarsening, no PWHT normally required.
Can S41045 be formed, bent or molded?
Cold forms and roll-forms adequately in annealed sheet but with less stretch than austenitics — use generous bend radii (≥1.5t), allow for springback, and hot work at 800–1100 °C for heavy sections.
What surface finishes work on S41045?
Pickle/passivate after welding to restore the 12Cr film; commonly used bare in utility service or painted for cosmetic uniformity, since surface will rust-stain in humid or coastal exposure.
S41045 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 |
|---|---|---|
| Ckept low to suppress martensite hardening | ≤ 0.04 | 0.02 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 1 | 0.45 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr12%Cr class, PREN ≈ 11 | 10.5 – 12.5 | 11.5 |
| Nismall Ni for toughness | 0.6 – 1.1 | 0.8 |
| Tistabilizer, typically ≥ 6×(C+N); Nb may substitute in some mill practices | 0.05 – 0.75 | 0.2 |
| N | ≤ 0.03 | 0.02 |
| Fe | balance | — |
S41045 1/4H — frequently asked
What is S41045 1/4H used for?
S41045 1/4H is typically used for fasteners, brackets and mild corrosion service parts. In short: non-hardenable 410 variant; low-cost 12 % Cr utility grade; weldable without PWHT.
What is the yield strength of S41045 1/4H?
S41045 1/4H has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 70% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is S41045 1/4H easy to machine?
Reasonably — machinability is rated fair (48/100, better than 88% of stainless steel grades). Machines like annealed 410 (~55 % of 1212): rigid setups, sharp positive-rake carbide, moderate speed and heavy feed to avoid work-hardened glazing; stabilized carbides/nitrides are mildly abrasive.
Can S41045 1/4H be welded?
Yes — weldability is rated good (65/100). Readily welded by GMAW/GTAW/SMAW/SAW without preheat in thin gauges; use austenitic 309L/308L filler for ductile welds, keep heat input low to limit HAZ grain coarsening, no PWHT normally required.
What surface finishes work on S41045 1/4H?
Pickle/passivate after welding to restore the 12Cr film; commonly used bare in utility service or painted for cosmetic uniformity, since surface will rust-stain in humid or coastal exposure.
Can S41045 1/4H be formed, bent or molded?
Cold forms and roll-forms adequately in annealed sheet but with less stretch than austenitics — use generous bend radii (≥1.5t), allow for springback, and hot work at 800–1100 °C for heavy sections.
What is the maximum service temperature of S41045 1/4H?
S41045 1/4H is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S41045 Annealed and S41045-FH?
Annealed is the default condition — default stocked condition: softest, most weldable and formable state for plate, sheet, bar and tube. FH: strip condition for flat springs, clamps and wear strips where no forming beyond slight bending is needed. Yield strength is 310 MPa in Annealed versus 650 MPa in FH.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A480/A480M — General Requirements for Flat-Rolled Stainless Steel — ASTM International (2023)
- SAE J1086 / ASTM DS-56 — Metals & Alloys in the Unified Numbering System (UNS) — SAE/ASTM (2017)
- 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)
- Utility 11–12 %Cr ferritic stainless plate datasheets (3CR12 / 410-modified class) — Columbus Stainless / Outokumpu / ATI (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.