Stainless Steel 410HT N&T (Normalized and tempered)
Heat-treated state
AISI/SAE 410HT
Pick for large sections and forgings needing uniform moderate strength with good toughness and dimensional stability for hot service.
Values for the N&T condition
Other 410HT tempers and conditions
410HT is listed in 6 conditions; see the grade overview at 410HT.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault full/subcritical anneal, softest supply condition | Pick for machining, forming or as stock to be hardened later; lowest strength, best ductility. | 300 | 490 | 25 | 155 HB | — |
N&TThis page Normalized and tempered | Pick for large sections and forgings needing uniform moderate strength with good toughness and dimensional stability for hot service. | 415 | 620 | 22 | 185 HB | — |
Cold drawn | Pick for close-tolerance shafting and screw-machine bar where extra strength and better surface finish are wanted without heat treatment. | 550 | 690 | 15 | 200 HB | — |
Oil/air quenched, tempered ~650–700 °C | The classic 410HT elevated-temperature condition: pick for steam valve stems, turbine blading and hot bolting where creep/oxidation service to ~650 °C and good toughness matter more than hardness. | 585 | 760 | 20 | 24 HRC | — |
Quenched and tempered ~590–650 °C | Pick for pump/valve shafting, fasteners and general machinery parts needing higher strength with still-acceptable toughness at moderate temperature. | 760 | 930 | 16 | 29 HRC | — |
Hardened and low-temperature tempered | Pick for wear surfaces, valve seats, cutlery-type and high-strength trim parts; toughness and hot strength are sacrificed, so keep service below ~400 °C. | 1,035 | 1,310 | 12 | 40 HRC | — |
What is 410HT N&T?
410HT N&T is 410HT heat treated to N&T — pick for large sections and forgings needing uniform moderate strength with good toughness and dimensional stability for hot service. 410HT N&T has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 62% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). 410HT N&T 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; N&T is available on request or by drawing note.
Advantages
- High electrical conductivity — 3 % IACS, better than 95% of stainless steel grades
- Easy to machine — 50/100, better than 90% 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 — 40/100, worse than 93% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Low fracture toughness — 85 MPa·√m (77.4 ksi·√in), worse than 77% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
410HT N&T properties
Typical room-temperature values for 410HT N&T; 10 are specific to this condition. Other listed values are 410HT reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
410HT N&T 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
410HT N&T has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 62% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
410HT N&T is rated for continuous service to 650°C (1,202 °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 9.9 µm/m·K (5.5 µin/in·°F).
Electrical3
410HT N&T conducts electricity at 3 % IACS, better than 95% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), worse than 93% of stainless steel grades.
Sustainability4
Producing a kilogram of 410HT N&T takes about 53 MJ of energy and emits 4.5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
410HT N&T's machinability is fair (50/100, better than 90% of stainless steel grades); weldability fair (40/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 410HT N&T
Is 410HT easy to machine?
Machine in the annealed or high-tempered condition with rigid setups, positive rake carbide, ~60–90 m/min and heavy flood coolant; it work-hardens and gums less than austenitics but leaves stringy chips — avoid dwelling to prevent glazing.
Can 410HT be welded?
Weldable with matched 410/410NiMo or austenitic 309/E309L filler; preheat 200–300 °C, keep interpass warm and temper at 650–730 °C after welding to restore ductility, otherwise the martensitic HAZ cracks.
Can 410HT be formed, bent or molded?
Cold form only in the annealed condition with generous radii (limited ductility, high springback); hot work at 1150–1200 °C, stop above 900 °C and always cool slowly or anneal to avoid quench cracks.
What surface finishes work on 410HT?
Takes a fine mechanical polish and hard-chrome or nitride coatings well; passivate in nitric acid after machining, and avoid electroplating hardened low-tempered parts without a post-plate bake (hydrogen embrittlement).
410HT 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 |
|---|---|---|
| C410HT is normally melted/selected to the upper part of the Type 410 carbon range for elevated-temperature strength; some mill practices run 0.15–0.20 % | 0.08 – 0.15 | 0.13 |
| Cr | 11.5 – 13.5 | 12.5 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 1 | 0.4 |
| Niresidual/intentional small addition to aid hardenability and toughness | ≤ 0.75 | 0.4 |
| Mooptional in some high-temperature mill practices | ≤ 0.5 | 0.15 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Fe | balance |
410HT N&T — frequently asked
What is 410HT N&T used for?
410HT N&T is typically used for steam turbine blades, pump shafts, valve stems and valve trim, compressor blading, high-temperature bolting and burner and furnace components. In short: heat-treatable martensitic plate.
What is the yield strength of 410HT N&T?
410HT N&T has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 62% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 410HT N&T easy to machine?
Reasonably — machinability is rated fair (50/100, better than 90% of stainless steel grades). Machine in the annealed or high-tempered condition with rigid setups, positive rake carbide, ~60–90 m/min and heavy flood coolant; it work-hardens and gums less than austenitics but leaves stringy chips — avoid dwelling to prevent glazing.
Can 410HT N&T be welded?
With care — weldability is rated fair (40/100). Weldable with matched 410/410NiMo or austenitic 309/E309L filler; preheat 200–300 °C, keep interpass warm and temper at 650–730 °C after welding to restore ductility, otherwise the martensitic HAZ cracks.
What surface finishes work on 410HT N&T?
Takes a fine mechanical polish and hard-chrome or nitride coatings well; passivate in nitric acid after machining, and avoid electroplating hardened low-tempered parts without a post-plate bake (hydrogen embrittlement).
Can 410HT N&T be formed, bent or molded?
Cold form only in the annealed condition with generous radii (limited ductility, high springback); hot work at 1150–1200 °C, stop above 900 °C and always cool slowly or anneal to avoid quench cracks.
What is the maximum service temperature of 410HT N&T?
410HT N&T is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 410HT Annealed and 410HT-CD?
Annealed is the default condition — pick for machining, forming or as stock to be hardened later; lowest strength, best ductility. CD: pick for close-tolerance shafting and screw-machine bar where extra strength and better surface finish are wanted without heat treatment. Yield strength is 300 MPa in Annealed versus 550 MPa in CD.
Can FabDigit make parts in 410HT N&T?
Yes — 410HT N&T is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A276/A276M — Stainless Steel Bars and Shapes — ASTM International (2023)
- ASTM A479/A479M — Stainless Steel Bars for Boilers and Pressure Vessels — ASTM International (2021)
- ASTM A565/A565M — Martensitic Stainless Steel Bars for High-Temperature Service — ASTM International (2019)
- GB/T 1220 — SAC (2007)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook — Stainless Steels — ASM International (1994)
- Type 410 stainless steel product data (physical and heat-treatment data) — AK Steel / Outokumpu (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.