ASTM A193 B8MA is an austenitic stainless steel used throughout the Oil and Gas industry for general connections including valves, flanges, and fittings where corrosion protection is required. Provided as standard in a class 1A solution annealed condition for general use. B8MA differs from standard ASTM A193 B8M material in that the finished form undergoes a further final carbide solution treatment to soften the material for use in specific application.

LoneStar Fasteners Europe offer ASTM A193 Grade B8MA in commercial grades, covering the basic requirements of ASTM A193, but can also offer with supplementary testing meeting additional requirements of the standard or to meet the demands of OEM or international accredited certification bodies.

ASTM A193 B8MA: Forms

  LoneStar Manufacture 
Stud Bolts
Hexagon Headed Bolting
Socket Headed Bolting
Double Ended and Waisted Studs
Associated OEM Parts

ASTM A193 B8MA: Sizes and Threads 

  LoneStar Manufacture 
Metric Coarse
Metric Fine
Imperial UNC
Imperial 8UN
Imperial UNF
Metric sizes available Up to M100
Imperial sizes available Up to 6.00″

ASTM A193 B8MA: Chemical Composition

Carbon 0.08 % Max
Manganese 2.00 % Max
Phosphorus 0.045 % Max
Sulphur 0.030 % Max
Silicon 1.00 % Max
Chromium 16.0 – 18.0 %
Nickel 10.0 – 14.0 %
Molybdenum 2.00 – 3.00 %

ASTM A193 B8MA: Mechanical Properties

2.1/2″ and under
Tensile Strength Min, Ksi 75
Yield Strength  min, 0.2% offset Ksi 30
Elongation in 4D min% 30
Reduction of Area min% 50
Hardness Max 192 HBW or 90 HRB


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