wilsonpipeline Stainless inventory includes Alloy 410 HT (UNS S41000) in Stainless Steel Pipes. Other product forms such as Stainless Steel Flanges, Stainless Steel Pipe Fittings.
Overview
General Properties
Type 416HT Stainless Steel is a stainless steel which is martensitic and has been hardened by heat treatment to higher strength and hardness levels. It has much better machining properties than the austenitic grades, but lower corrosion resistance.It has the highest machinability of any stainless steel at about 85% of that of a free-machining carbon steel. Martensitic stainless steels were designed to be hardenable by heat treatment and also corrosion resistant. Although Alloy 416HT and other martensitic stainless steels are not as resistant as austenitic or ferritic stainless, it still demonstrates good corrosion and oxidation resistance plus high strength in the hardened and tempered condition. Alloy 416HT is easily machined, is always magnetic, and has low frictional properties that reduce galling and seizing.
Specifications: UNS S41600
Applications:
Alloy 416HT is generally used for parts that are extensively machined and require the corrosion resistance of a 13% chromium stainless steel. Applications that generally use Alloy 416 include:
- Electrical motors
- Nuts and bolts
- Pumps
- Valves
- Automatic screw machine parts
- Washing machine components
- Studs
- Gears
Standards:
- ASTM/ASME: UNS S41600
- EURONORM: FeMi35Cr20Cu4Mo2
- DIN: 2.4660
Resistance
Corrosion Resistance:
- Demonstrates corrosion resistance to natural food acids, waste products, basic and neutral salts, natural waters, and most atmospheric conditions
- Less resistant that the austenitic grades of stainless steel and also the 17% chromium ferritic alloys
- High sulfur, free-machining grades like Alloy 416HT are unsuitable for marine or other chloride exposure
- Maximum corrosion resistance is achieved in the hardened condition, with a smooth surface finish
Heat Resistance
- Fair resistance to scaling in intermittent service up to 1400oF (760oC) and up to 1247oF (675oC) in continuous service
- Not recommended for use in temperatures above the relevant tempering temperature if maintenance of mechanical properties is important
Processing
Welding Characteristics
- Poor weldability
- If welding is necessary use Alloy 410 low hydrogen electrodes
- Pre-heat to 392 to 572°F (200-300°C)
- Follow immediately with annealing or re-hardening, or a stress relief at 1202 to 1247°F (650 to 675°C)
Machinability
- Has outstanding machinability
- Best machinability is in the sub-critical annealed condition
Properties
Chemical Properties:
| C | Mn | Si | P | S | Cr | |
|---|---|---|---|---|---|---|
| 416HT | 0.15 max | 1.25 max | 1.00 max | 0.06 max | 0.15 max | min: 12.0 max: 14.0 |
Mechanical Properties:
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Brinell (HB) | Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed * | 517 | 276 | 30 | 262 | – |
| Condition T ** | 758 | 586 | 18 | 248-302 | – |
| 204 | 1340 | 1050 | 11 | 388 | 20 |
| 316 | 1350 | 1060 | 12 | 388 | 22 |
| 427 | 1405 | 1110 | 11 | 401 | # |
| 538 | 1000 | 795 | 13 | 321 | # |
| 593 | 840 | 705 | 19 | 248 | 27 |
| 650 | 750 | 575 | 20 | 223 | 38 |
| * Annealed properties are typical for Condition A of ASTM A582. | |||||
| ** Hardened and tempered Condition T of ASTM A582 – Brinell Hardness is specified range, other properties are typical only. | |||||
| # Due to associated low impact resistance this steel should not be tempered in the range 400- | |||||
Physical Properties:
| Density kg/m3 | Thermal Conductivity W/mK | Electrical Resistivity (Microhm/cm) | Modulus of Elasticity | Coefficient of Thermal Expansion µm/m/°C | Specific Heat (J/kg.K) | Specific Gravity |
|---|---|---|---|---|---|---|
| 7750 | 24.9 at 212°F | 43 at 68°F | 200 GPa | 9.9 at 32 – 212°F | 460 at 32°F to 212°F | 7.7 |
| 28.7 at 932 °F | 11.0 at 32 – 599°F | |||||
| 11.6 at 32-1000°F |
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