50 grades of stainless steel
BSSA

The BSSA has selected 50 Grades of Stainless Steel as its theme for 2014. Each week throughout the year, we will showcase one grade and illustrate the variety of corrosion resistant, mechanical and physical properties which determine its suitability for a wide range of applications.

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Lean Duplex 1.4062/1.4162/1.4362/1.4482/1.4662 S32202/S32101/S32304/S32001/S82441

Footbridge

Footbridge

Courtesy of Outokumpu

Masonry Support

Masonry Support Anchors

Courtesy of Modersohn/Aperam

Lean Duplex is a generic term covering a range of stainless steel grades which are designed to have corrosion resistance in the spectrum of 304 to 316 or slightly beyond but with at least twice the design strength at lower cost.

Approximate Composition – 20-24% Cr, 1.0-4.0% Ni, low Mo 0.1-0.25% plus N (Exact composition ranges vary between EN and ASTM standards).

These grades combine the following characteristics:

  • Pitting and crevice corrosion resistance in range of 304 to just above 316
  • Good stress corrosion cracking resistance
  • Good yield strength (450 MPa minimum up to 550 MPa). 2-2.5 times design strength of 304/316
  • Good impact toughness to minus 50ºC
  • Good weldability. Parameters less critical than standard duplex and superduplex grades
  • Cost effectiveness due to low alloy content especially Ni and Mo
  • Moderate formability. Higher power required due to higher strength. Special formability grades being developed

Lean duplex grades offer a cost effective alternative to standard austenitic grades like 304/304L and 316/316L. With the higher design strength, section thickness can often be reduced leading to significant weight and cost reduction. Each grade in this category should be evaluated on its own merits.

Applications include:

Storage vessels, domestic hot water tanks, structural sections, lintels, reinforcing bar, bridges, building support products.

Find out more about the 50 Grades of Stainless Steel campaign
 

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British Stainless Steel Association (BSSA): registered in England and Wales as a private company limited by guarantee; registration no. 07547349