Type 416HT (UNSS41600/2.4660)

Description

Overview:

Type 416HT stainless steel is martensitic chromium steel, hardened by heat treatment. It is extremely machinable, rendering machinability of 85%.

It shows high strength in hardened and tempered condition and good resistance to corrosion and oxidation, even though it is not as resistant as austenitic or ferritic stainless steels. Type 416HT is always magnetic, easily machined, and provides little friction, reducing galling and seizing.

It is generally used for parts requiring high machining and corrosion resistance of a 13% chromium stainless steel.

Common Names:

Stainless steel type 416HT is commonly known as Chromium steel.

Executive Standards/Grades:

• JIS: SUS 416HT
• ASTM: A484
• DIN: 2.4660
• UNS: S41600
• SUS: SUS416HT
• Euronorm: FeMi35Cr20Cu4Mo2

Chemical Properties:

Type 416HT stainless steel has the following chemical composition:

• Carbon – 0.15%
• Manganese – 1.25%
• Chromium – 12-14%
• Sulphur – 0.15%
• Phosphorus – 0.06%
• Silicon – 1.00%

Mechanical Properties:

• Hardness (HRB) – 262
• Elongation (%) – 30
• Yield Strength (Mpa) – 276
• Tensile Strength (Mpa) – 517

Physical Properties:

• Density (x1000 kg/cm³) – 7.75
• Elastic Modulus (GPa) – 200
• Thermal Conductivity (W/m.K) – 24.9 at 212^oF
• Specific Heat (J/kg.K) – 460 at 32-212°F
• Electrical Resistivity – 43 at 68^oF
• Specific gravity – 7.7

Key Features:

• Martensitic stainless steel, hardened by heat treatment to obtain higher strength and hardness
• Designed to be hardenable by heat treatment and corrosion resistant
• Excellent machining characteristics lack in corrosion resistance
• Easily machined, always magnetic
• Offers the highest machinability of any stainless steel, at 85%
• Low frictional properties, reducing galling and seizing
• Fair resistance to scaling

Forms Available:

Stainless steel type 416HT is available in different forms such as:

• Sheet
• Plate
• Bar
• Coil
• Tube

Applications:

Because of its properties, stainless steel type 416HT has a wide range of applications including:

• Electrical motors
• Nuts and bolts
• Pumps
• Valves
• Washing machine components
• Automatic screw machine parts
• Studs
• Gears

Possible Alternatives Grades:

Type 416HT stainless steel has some possible alternatives that can be used. Such as:

• 410 – Better corrosion resistance and formability.
• 316 – Better resistance to corrosion and pitting.
• 420 – Higher hardened strength or hardness.
• 440C – Better corrosion resistance.

FAQs:

• How corrosion resistant is stainless steel type 416HT?

Although less resistant than the austenitic grades of stainless steel, type 416HT provides corrosion resistance to most atmospheric conditions, food acids, basic and neutral salts, waste products, and natural waters.

• Is type 416HT weldable?

Type 416HT stainless steel provides poor weldability. For welding, pre-heat at 392-572^oF, then re-harden, anneal, or relieve stress at temperatures of 1202-1247^oF. It is recommended to use Alloy 410 low hydrogen electrodes.

• How heat resistant is type 416HT stainless steel?

Type 416HT stainless steel is not recommended for use in temperatures higher than the relevant tempering temperature to maintain mechanical properties. It provides fair resistance to scaling, up to 1400^oF in intermittent use, and up to 1247^oF in continuous use.

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