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 | ✓ | |
| Studding | ✓ | |
| 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 | ✓ | |
| ACME | ✓ | |
| 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 | % |
| Copper | – | – |
| Niobium | – | – |
| Titanium | – | – |
| Vanadium | – | – |
| Aluminium | – | – |
| Nitrogen | – | – |
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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