Overview
CK20, also known as S31000 in its wrought form, is a versatile "300 series" stainless steel alloy that offers a balanced combination of strength, toughness, and corrosion resistance. This alloy, containing up to 27% chromium and 22% nickel, exhibits good resistance to a wide range of corrosive environments. In addition to its corrosion resistance, CK20 provides good strength, wear resistance, and galling resistance, making it suitable for applications involving moderate mechanical stress and friction. Its inherent toughness allows it to absorb significant impact energy without fracturing, making it a reliable choice for applications where resistance to shock and vibration is important. This combination of properties makes CK20 a valuable choice for diverse applications requiring a balance of performance and durability.
Typical Uses
Chemical processing equipment, food & beverage, pump and valve parts, and nuclear applications.
MetalTek Designation
MTEK 310
Poured At:
Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division
Similar Specifications
Cast UNS: J94202
Wrought UNS: S31000
Wrought Grade: 310
Cast Grade: CK20
Cast ASTM: A351, A743
Military/AMS: AMS 5365
* AMS specifying sand casting.
Typical Chemical Composition (% by wt.)
Aluminum: n/a
Carbon: 0.2
Chromium: 23-27
Manganese: 1.5
Iron: n/a
Copper: n/a
Nickel: 19-22
Lead: n/a
Tin: n/a
Silicon: 1.75
Zinc: n/a
Minimum Mechanical Properties
Heat Treatment: Solution Anneal
Frequently Asked Questions
Austenitic steel is a non-magnetic stainless steel alloy with high chromium and nickel content. It provides excellent corrosion resistance, formability, and weldability, making it ideal for industrial and food-grade applications.
Common applications include food processing equipment, pump and valve components, chemical processing equipment, and heat exchangers due to its excellent corrosion resistance.
Super austenitic steels contain higher levels of molybdenum, nickel, and nitrogen than standard austenitic steels, enhancing their resistance to pitting, crevice corrosion, and stress corrosion cracking in harsh environments.
Benefits include superior corrosion resistance, high ductility, excellent weldability, and good performance at both cryogenic and elevated temperatures.
Austenitic stainless steel is corrosion-resistant and non-magnetic, while martensitic stainless steel is magnetic, harder, and better suited for wear-resistant and high-strength applications.
In its annealed state, austenitic stainless steel is non-magnetic. However, it may exhibit slight magnetism after cold working due to partial transformation into martensite.
Common austenitic grades include 304, 309, 310 and 316 stainless steels. These are widely used across industries for their excellent corrosion resistance and mechanical properties.
Austenitic steel offers better corrosion resistance and ductility than ferritic steel, which is magnetic, has lower chromium content, and is more cost-effective but less weldable.
