Chemical compositions of stainless steels to BS 3146-2

Introduction

BS 3146-2 is the material standard for stainless steel and some nickel based alloy castings, to be made by the investment (or lost wax) process. Martensitic, precipitation hardening, austenitic austenitic-ferritic (duplex) grades are included. The chemical composition of the stainless steel and some nickel based alloys in the standard are listed.

Despite the advent of the European standards system, this BS is still current. See BSI Website. There is no EN standard which replaces it.

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The data given is not intended to replace that shown in individual standards to which reference should always be made.

BS 3146-2 chemical composition table

 

Grade
Chemical composition (% by mass - max unless stated)
  C Si Mn P S Cr Mo Ni Others
Martensitic Grades
ANC1- A 0.15 0.2/1.2 0.2/1.0 0.035 0.035 11.5/13.5 - 1.0 -
ANC1- B 0.12/0.2 0.2/1.2 0.2/1.0 0.035 0.035 11.5/13.5 - 1.0 -
ANC1- C 0.2/0.3 0.2/1.2 0.2/1.0 0.035 0.035 11.5/13.5 - 1.0 -
ANC2 0.12/0.25 0.2/1.0 0.2/1.0 0.035 0.035 15.5/20.0 - 1.5/3.0 -
Austenitic Grades
ANC3 - A 0.12 0.2/2.0 0.2/2.0 0.035 0.035 17.0/20.0 - 8.0/12.0 -
ANC3 - B 0.12 0.2/2.0 0.2/2.0 0.035 0.035 17.0/20.0 - 8.5/12.0 Nb 8xC/1.10
ANC4 - A 0.08 0.2/1.5 0.2/2.0 0.035 0.035 18.0/20.0 3.0/4.0 11.0/14.0 -
ANC4 - B 0.08 0.2/1.5 0.2/2.0 0.035 0.035 17.0/20.0 2.0/3.0 10.0 min -
ANC4 - C 0.12 0.2/1.5 0.2/2.0 0.035 0.035 17.0/20.0 2.0/3.0 10.0 min Nb 8xC/1.10
ANC5 - A 0.5 0.2/3.0 0.20/2.0 - - 22.0/27.0 - 17.0/22.0 -
ANC5 - B 0.5 0.2/3.0 - - 15.0/25.0 - 36.0/46.0 - -
ANC5- C 0.75 0.2/3.0 0.2/2.0 - - 10.0/20.0 - 55.0/65.0 -
ANC6 - A 0.15/0.3 0.75/2.0 0.2/1.0 0.035 0.035 20.0/25.0 - 10.0/15.0 -
ANC6 - B 0.15/0.3 0.75/2.0 0.2/1.0 0.035 0.035 20.0/25.0 - 10.0/15.0 W 2.5/3.5
ANC6 - C 0.05/0.15 0.75/2.0 0.2/1.0 0.035 0.035 20.0/25.0 - 10.0/18.0 W 2.5/3.5
Precipitation Hardening Grades
ANC20 A 0.07 0.2/2.0 0.2/1.0 0.025 0.025 12.5/15.5 0.5/2.5 3.0/6.0 Cu 1.0/3.5 Nb 0.5
ANC20 B 0.07 0.2/2.0 0.2/1.0 0.025 0.025 12.5/15.5 0.5/2.5 3.0/6.0 Cu 1.0/3.5 Nb 0.5
Duplex Grades
ANC21 0.05 0.75 0.75 0.050 0.050 25.0/27.0 1.75/2.25 4.75/6.00 Cu 2.75/3.25 N 0.10

Note
For grades ANC1, ANC3 and ANC4, where specified, the sulphur (S) level may be as high as 0.3% where free machining properties are required.

 

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