Type 420J2 (UNS S42010/1.4028)

Description

Type 420J2 stainless steel is martensitic steel, which is inexpensive and very resistant to corrosion. It offers corrosion resistance both in industrial and domestic environments, as well as in the mild atmosphere.

It provides resistance to many chemicals, acids, petroleum products, steam, and household cleaners. Type 420J2 is the preferred stainless-steel choice for knife manufacturers.

In comparison with 440 grades, stainless-steel type 420J2 provides better strength and good resistance to impact when it is in tempered and hardened conditions.

Common Names:

Stainless steel type 420J2 is commonly known as Chromium steel.

Executive Standards/Grades:

• EN: X20Cr13
• UNS: S42000
• JIS: SUS420J2
• BS: 420S37
• DIN: 1.4028
• SIS: 2304
• AISI: 420M
• AFNOR: Z20C13

Chemical Properties:

Type 420J2 stainless steel has the following chemical composition:

• Carbon – 0.15-0.36%
• Manganese – 1.00%
• Chromium – 14%
• Sulfur – 0.03%
• Phosphorus – 0.04%
• Silicon – 1.00%
• Nickel (optional) – 1.00%
• Iron – Balance

Mechanical Properties:

• Hardness (HBW) – 244
• Elongation (%) – 8 to 25
• Yield Strength (Mpa) – 350-550
• Young Moduls (Mpa) – 200000
• Tensile Strength (Mpa) – 650-880
• Fatigue (Mpa) – 275

Physical Properties:

• Density (x1000 kg/cm3) – 7.7
• Thermal Conductivity (W/m.K) – 25
• Specific Heat (J/kg.K) – 460
• Electrical Resistivity (ohm.mm²/m) – 0.55
• Thermal expansion (e-6/K) – 10
• Melting Temperature – 2642-2750 ⁰F

Key Features:

• Stainless steel with excellent corrosion resistance.
• Low cost
• Provides resistance to carbonic acid, ammonia, dilute nitric acid, detergent solutions, crude oil, food acids, vinegar, steam, and some petroleum products.
• Good strength and good resistance to impact when hardened and tempered
• Good machining properties
• Easily welded

Forms Available:

Stainless steel type 420J2 is available in different forms such as:

• Sheet
• Plate
• Bar
• Tube
• Coil
• Strip

Applications:

Because of its properties, stainless steel type 420J2 has a wide range of applications including:

• Surgical instruments
• Daggers and swords
• Budget knives and diving knives
• Haircutting scissors and domestic scissors

Possible Alternatives Grades:

Type 420J2 stainless steel has some possible alternatives that can be used. Such as:

• 420 – Less machinable.
• 420J1 – Lower hardness.
• 304 – The most commonly stainless steel, containing both chromium and nickel

FAQs:

• How does type 420J2 stainless steel behave to welding?

Type 420J2 stainless steel can be easily welded. It is recommended to be welded either in annealed condition or in hardened and tempered condition.

• Can type 420J2 be easily machined?

Type 420J2 stainless steel is machinable steel that can also undergo machining in hardened and tempered condition like drilling, bending, and turning. Yet, it is recommended to avoid machining in the hardened condition.

• How does type 420J2 respond to heat treatment?

Type 420J2 stainless steel should be evenly heated at a temperature of 1346-1454 ^oF. It should be held until the entire section is brought at the same temperature.

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