Stainless Steel S41050 QT-High
Heat-treated state
UNS S41050 · EN 1.4030
QT-High = q&T
Best strength/toughness balance for shafts, valve internals and turbine parts; tempered soft martensite.
Values for the QT-High condition
Other S41050 tempers and conditions
S41050 is listed in 4 conditions; see the grade overview at S41050.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault softened (approx. 780–850 °C, air/furnace cool) | Standard stocked condition for plate, sheet and welded/seamless tube; maximum ductility for forming and welding. | 360 | 540 | 28 | 160 HB | — |
Cold drawn | Use when higher strength, tighter tolerance and better surface finish are needed without heat treatment. | 570 | 700 | 15 | 220 HB | — |
QT-HighThis page Q&T | Best strength/toughness balance for shafts, valve internals and turbine parts; tempered soft martensite. | 620 | 760 | 18 | 24 HRC | — |
Q&T | Pick for maximum hardness/wear of this low-carbon grade; hardness is capped by the ≤0.04 % C content. | 760 | 950 | 14 | 31 HRC | — |
What is S41050 QT-High?
S41050 QT-High is S41050 heat treated to QT-High — best strength/toughness balance for shafts, valve internals and turbine parts; tempered soft martensite. S41050 QT-High has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). S41050 QT-High 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; QT-High is available on request or by drawing note.
Advantages
- High electrical conductivity — 3 % IACS, better than 95% of stainless steel grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 95% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Conducts heat well — 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades
Limitations
- Needs corrosion protection — 42/100, worse than 90% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
S41050 QT-High properties
Typical room-temperature values for S41050 QT-High; 13 are specific to this condition. Other listed values are S41050 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S41050 QT-High 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).
Mechanical14
S41050 QT-High has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S41050 QT-High is rated for continuous service to 600°C (1,112 °F). It conducts heat at 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
S41050 QT-High 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 S41050 QT-High takes about 42 MJ of energy and emits 3.2 kg of CO₂ — less than 95% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
S41050 QT-High's machinability is fair (42/100, better than 79% of stainless steel grades); weldability good (55/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S41050 QT-High
Is S41050 easy to machine?
Machines like annealed 410 (~55 % of AISI 1212): use rigid setups, sharp positive-rake carbide, moderate speed and heavy feed to avoid work-hardened glazing; stringy chips in the low-C annealed state.
Can S41050 be welded?
Readily welded by GTAW/GMAW with 410NiMo or austenitic 309L filler; low carbon limits HAZ hardening, but preheat 100–200 °C and post-weld temper 650–700 °C are advised on thick sections.
Can S41050 be formed, bent or molded?
Annealed sheet and tube cold-bend and expand well for tube-to-tubesheet joints; springback is higher than 304 and severe draws should be interstage-annealed.
What surface finishes work on S41050?
Passivate per ASTM A967 (nitric or citric) or electropolish after pickling; takes a good mechanical polish but the 12 % Cr film needs paint or coating for outdoor/chloride exposure.
S41050 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 for toughness/weldability | ≤ 0.04 | 0.02 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.05 | — |
| S | ≤ 0.03 | — |
| Cr | 10.5 – 12.5 | 11.5 |
| Niaustenite stabiliser, toughness | 0.6 – 1.1 | 0.85 |
| Nstrengthening / ferrite control | ≤ 0.1 | 0.04 |
| Fe | balance | — |
S41050 QT-High — frequently asked
What is S41050 QT-High used for?
S41050 QT-High is typically used for fasteners, cutlery-adjacent components and general corrosion-resistant parts. In short: EN 1.4030 cross-reference; cold-workable 410 family; heat-treatable to two strength levels.
What is the yield strength of S41050 QT-High?
S41050 QT-High has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S41050 QT-High easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Machines like annealed 410 (~55 % of AISI 1212): use rigid setups, sharp positive-rake carbide, moderate speed and heavy feed to avoid work-hardened glazing; stringy chips in the low-C annealed state.
Can S41050 QT-High be welded?
Yes — weldability is rated good (55/100). Readily welded by GTAW/GMAW with 410NiMo or austenitic 309L filler; low carbon limits HAZ hardening, but preheat 100–200 °C and post-weld temper 650–700 °C are advised on thick sections.
What surface finishes work on S41050 QT-High?
Passivate per ASTM A967 (nitric or citric) or electropolish after pickling; takes a good mechanical polish but the 12 % Cr film needs paint or coating for outdoor/chloride exposure.
Can S41050 QT-High be formed, bent or molded?
Annealed sheet and tube cold-bend and expand well for tube-to-tubesheet joints; springback is higher than 304 and severe draws should be interstage-annealed.
What is the maximum service temperature of S41050 QT-High?
S41050 QT-High is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S41050 Annealed and S41050 QT-Low?
Annealed is the default condition — standard stocked condition for plate, sheet and welded/seamless tube; maximum ductility for forming and welding. QT-Low: pick for maximum hardness/wear of this low-carbon grade; hardness is capped by the ≤0.04 % C content. Yield strength is 360 MPa in Annealed versus 760 MPa in QT-Low.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A803/A803M — Welded Ferritic Stainless Steel Feedwater Heater Tubes — ASTM International (2021)
- ASTM A268/A268M — Seamless and Welded Ferritic/Martensitic Stainless Steel Tubing — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- UNS S41050 / SAE-ASTM Unified Numbering System listing — SAE/ASTM (2022)
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.