Description of Material
ASTM A193 B8M 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 1 solution annealed condition for general use, this material is also available in a class 2 strain hardened condition to increase its strength and general mechanical properties.
LoneStar Fasteners Europe offer ASTM A193 B8M 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 B8M: Forms
| LoneStar Manufacture | ||
| Stud Bolts | ✓ | |
| Studding | ✓ | |
| Hexagon Headed Bolting | ✓ | |
| Socket Headed Bolting | ✓ | |
| Double Ended and Waisted Studs | ✓ | |
| Associated OEM Parts | ✓ |
ASTM A193 B8M: 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 B8M: 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 B8M: Mechanical Properties
| Class 1 | ||
| Tensile Strength Min, Ksi | 75 | |
| Yield Strength min, 0.2% offset Ksi | 30 | |
| Elongation in min% | 30 | |
| Reduction of Area min% | 50 | |
| Hardness Max | 96 HRB |
| Class 2 | ¾” and Under | ¾” to 1” Inc. |
| Tensile Strength Min, Ksi | 110 | 100 |
| Yield Strength min, 0.2% offset Ksi | 95 | 80 |
| Elongation in min% | 15 | 20 |
| Reduction of Area min% | 45 | 45 |
| Hardness Max | 35 HRC | 35 HRC |
| Class 2 | Over 1” to 1.1/4” Inc. | Over 1.1/4” to 1.1/2” Inc. |
| Tensile Strength Min, Ksi | 95 | 90 |
| Yield Strength min, 0.2% offset Ksi | 65 | 50 |
| Elongation in min% | 25 | 30 |
| Reduction of Area min% | 45 | 45 |
| Hardness Max | 35 HRC | 35 HRC |
Similar or Equivalent Standards
| Class 1 | Class 2 | |
| AISI 316 | AISI 316 | |
| AFNOR Z6CNT 17.11 | AFNOR Z6CND 17.11 | |
| DIN X 5 Cr NiMo 18.1 | DIN X5 Cr Ni Mo 18.10 | |
| B.S 1506.845 | B.S 1506.845 |
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