B16 Alloy Steel Bar - B5F5B - ASTM A 193

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B16 alloy steel bar is a chromium, molybdenum, vanadium alloy steel widely used for high strength industrial applications. It is commonly used in power generation turbines in high strength fastener applications such as bolt material.

B-16 Alloy Steel Inventory Size Ranges


1.000" - 7.000"

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Standard Inventory Specifications

  • ASTM A 193 Gr B16 
    (w/ supplement of S2 charpy impact test)
  • S6 stress relieving by AOD-ESR melt
  • GE-B5F5
  • EN 10204
  • Hot worked, solution treated (annealed), then descaled

Common Trade Names

  • B16 alloy 
  • B16
  • B16 bolt material

Common Applications of B-16 Alloy Steel

  • Power generation 
  • Bolting
Chemical Composition of B16 Alloy Steel
Element Percent by Weight
C Carbon 0.42 - 0.50%
Cr Chromium 0.80 - 1.15%
Mn Manganese 0.45 - 0.70%
Mo Molybdenum 0.45 - 0.65%
P Phosphorous 0.025% max (bars)
V Vanadium 0.25 - 0.35%
S Sulfur 0.025% max (bars)
Al Aluminum 0.015% max
Si Silicon 0.20 - 0.35%

Physical Properties of B16 Alloy Steel

B16 alloy is typically hardened by oil quenching and tempering after the part has reached room temperature
In diameters over 7" water quenching may be used to meet Charpy impact properties
Density = 0.283 (lb/cu. In.) 


Mechanical Properties of B16 Alloy Steel

Hardness Generally, B16 alloy steel bar is supplied in the quenched and tempered condition where the hardness is normally Rc 35-43. In the annealed condition, hardness is typically 187 BHN.
Machinability Generally supplied in the quenched and tempered condition, machinability is similar to standard AISI alloys such as 4340.


*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.