STAINLESS STEEL TUBING    
 


STAINLESS STEEL TUBING
 

STAINLESS STEEL TUBING FROM Service Steel

Service Steel stocks stainless steel tube in outside diameters from 1/8-inch to 10-inches. This includes grades: 304 and 316 in cold-drawn seamless, hot finished, and welded constructions and low carbon 304-L and 316-L welded. 304L and 316L are specified for applications where welding will be required. This alloy’s lower carbon content helps minimize/eliminate carbide precipitation during the welding process.

What Is Stainless Steel?

Stainless steel is an alloy of iron with a minimum of 10.5% chromium. Chromium produces a thin layer of oxide on the surface of the steel that prevents any further corrosion (i.e., rust) of the surface. The chromium binds oxygen to the surface of the product to protect the iron from oxidation (rust). Nickel also enhances the corrosion resistance of stainless steel. Stainless steel also contains varying amounts of carbon, silicon and manganese. Other elements such as nickel and molybdenum may be added to impart other useful properties such as enhanced formability and increased corrosion resistance. In addition to its corrosion resistance, stainless steel is clean and sanitary in nature and resistant to chipping, scraping and scratching.

stainless steel tube in use
stainless steel tube
stainless steel tube in use
stainless steel tube

Stainless Steel Types

There are five main types of stainless steel:

Austenitic Stainless Steel

These are the Type 200 Series and Type 300 Series alloys.

  • Non-magnetic
  • Cannot be heat hardened
  • High resistance to corrosion
  • Steel type of choice in the dairy and food-processing industries

The most common grades  are Types 304 and 316.

Ferritic Stainless Steel

Along with martensitic, comprise the Type 400 Series alloys.

  • Corrosion resistant
  • Cannot be heat hardened

Seen more often in the auto industry (e.g., exhaust systems, axles, shafts, and fasteners

Martensitic Stainless Steel

Along with ferritic, comprise the Type 400 Series alloys.

  • Magnetic
  • Can be heat hardened with heat
  • Fairly good at resisting corrosion, but do not as good as austenitic or ferritic

Used in cutlery, knives, surgical tools, certain workshop tools like wrenches

Duplex Stainless Steel

So-called  because they have a two-phase microstructure of ferritic and austenitic stainless steel.

  • Twice as strong as regular austenitic or ferritic
  • Significantly better toughness and ductility than ferritic
  • The best type for resisting corrosion

Often used in situations where chemicals need to be stored or transported, as well as heat exchangers, pressure vessels, and desalination plants

Precipitation-Hardening Stainless Steel

Type 600 Series Alloys. Contain chromium and nickel that provide a combination of the properties of martensitic and austenitic grades.

  • Gain high strength through heat treatment
  • Have the corrosion resistance of austenitic
  • High tensile strength

Used in aerospace, nuclear, chemical, and certain construction-type settings.

The Most Common Stainless Steel Grades

TYPE 304

The most common grade; the classic 18/8 stainless steel. Contains high nickel content that is typically between 8 and 10.5 percent by weight and a high amount of chromium at approximately 18 to 20 percent by weight resulting in the 18/8 moniker often used. The high amounts of chromium and nickel give 304 stainless steel excellent corrosion resistance. Common applications of 304 stainless steel include:

  • Appliances such as refrigerators and dishwashers
  • Commercial food processing equipment
  • Food handling and utensils
  • Surgical devices and equipment
  • Piping
  • Heat exchangers

TYPE 316

The second most common grade. Increased corrosion resistance due to the addition of a significant amount molybdenum. considered one of the most suitable choices when selecting an austenitic stainless steel for marine applications due to its increased resistance to chloride corrosion compared to type 304. Often used for building nuclear reprocessing plants. Other common applications include:

  • Chemical processing and storage equipment.
  • Refinery equipment
  • Medical devices
  • Marine environments, especially those with chlorides present

Have questions or need more information? Drop us a note.

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