A193 B8M SS316 STUD BOLTS
ASTM A193 B8M SS316 Stud Bolts are high performance stainless steel bolting components manufactured from 316 stainless steel according to ASTM A193 Grade B8M requirements. Compared with B8 SS304 stud bolts, B8M stud bolts contain molybdenum elements that provide improved resistance to pitting and corrosion, making them suitable for more demanding environments.
Designed for applications requiring enhanced corrosion protection and long service life, ASTM A193 B8M stud bolts are commonly used in chemical processing equipment, marine environments, offshore facilities, oil and gas systems and other industrial applications exposed to moisture, chlorides or corrosive media. These stud bolts are typically used with ASTM A194 Grade 8M stainless steel nuts for reliable flange connections.
Specification of A193 B8M stud bolts:
A193 B8M stud bolts, made from stainless steel grade 316, find applications in various industries due to their corrosion resistance and mechanical properties. Here are some common applications:
| Product name | ASTM A193 B8M Stud Bolts |
|---|---|
| Diameter | 1/4″ – 4″ |
| Dimension Standard | ASME B18.31.2 |
| Thread | UNC/UNF/8UN |
| Material | Stainless steel, AISI 316 |
| Compatible nuts/washers | A194 GR.8M heavy hex nuts |
| Manufacturing Process | wire drawing, thread rolling, heat treatment, surface treatment |
| Surface treatment | Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating |
| Application Industry | Piping Systems/Pressure Vessels/Pressure Vessels/Oil and Gas Industry/Power Generation/Chemical Processing |
A193 B8M stud bolts are specifically chosen for their corrosion resistance and mechanical properties in challenging conditions. Always ensure that the selected fasteners meet the requirements of your specific application to ensure safety and reliability.
Chemical Composition:
| Elements | Range | Allowed Variation, % |
|---|---|---|
| Carbon, max | 0.08 % | + 0.01 |
| Manganese, max | 2.00 % | + 0.04 |
| Phosphorus, max | 0.045 % | + 0.010 |
| Sulfur, max | 0.030 % | + 0.005 |
| Silicon, max | 1.00 % | + 0.05 |
| Chromium | 16.00 – 18.00 % | +/- 0.20 |
| Nickel | 10.00 – 14.00 % | +/- 0.15 |
| Molybdenum | 2.00 – 3.00 % | +/- 0.10 |
Mechanical and physical properties:
| Mechanical Requirements, Inch Products | |||||||
|---|---|---|---|---|---|---|---|
| Class | Diameter | Tensile Strength, min, ksi | Yield Strength, min, ksi | Elongation in 4D min, % | Reduction of Area, min, % | Hardness, max | |
| 1 | All Diameters | 75 | 30 | 30 | 50 | 223 HBW | 96 HRB |
| 2 | 3/4 and under | 110 | 95 | 15 | 45 | 321 HBW | 35 HRC |
| Over ¾ to 1, incl. | 100 | 80 | 20 | 45 | |||
| Over 1 to 1-1/4, incl. | 95 | 65 | 25 | 45 | |||
| Over 1-1/4 to 1-1/2, incl. | 90 | 50 | 30 | 45 | |||
Quality control of A193 B8M Stud bolts:
| Control Method | Detail |
|---|---|
| Material Inspection: | Verify the material's composition, heat treatment, and quality upon receipt. Conduct metallurgical analysis to ensure the material properties meet the standards. |
| Process Control: | Implement strict process control measures for heat treatment, machining, threading, and any other manufacturing steps. Maintain consistent process parameters to ensure uniform quality. |
| Inspection Points: | Introduce inspection points at various stages of manufacturing to check for defects, dimensions, and quality. Inspect threading, dimensions, surface finish, and other critical parameters. |
| Sampling and Testing: | Regularly sample products for testing, such as tensile testing, hardness testing, and metallurgical analysis, to ensure they meet the required specifications. |
| Thread Inspection: | Thoroughly inspect threading using proper thread gauges to ensure accurate dimensions and fit with mating components. |
| Traceability: | Implement a traceability system to track each fasteners journey from raw material to final product. This aids in accountability and recalls if necessary. |