ASTM A193 Grade B7 Stud Bolts
ASTM A193 Grade B7 stud bolts are high-strength, high-durability fasteners manufactured in accordance with the American Society for Testing and Materials (ASTM) A193 standard.
ASTM A193 Grade B7 stud bolts are high-strength, high-durability fasteners manufactured in accordance with the American Society for Testing and Materials (ASTM) A193 standard. They are made of alloy steel, quenched and tempered, and have excellent mechanical properties. They are widely used in various industrial equipment and structural connections that need to withstand high pressure and high temperature, such as petrochemical equipment, pressure vessels, pipeline flange connections, etc.
ASTM A193 Grade B7 Stud Bolts Specification
| Standard Specification Of | ASTM A193 Grade B7 Stud Bolts |
| Type Of Head | Hex, Threading, Square, Round |
| Size Type | Inches 3/8 to 3 |
| Surface Finish | Plain / Zinc plated / Hot dip galvanized |
| Standard Dimensions Of | ASME B18.2.1 |
ASTM A193 Grade B7 Stud Bolts Material
ASTM A193 Grade B7 Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr |
| ASTM A193 Grade B7 | MIN | 0.37 | 0.65 | 0.15 | 0.75 | ||
| MAX | 0.49 | 1.10 | 0.035 | 0.040 | 0.35 | 1.20 |
Manganese is usually between 0.65 and 1.10%. Manganese helps to improve the strength, hardness and toughness of steel, and can improve the deoxidation and desulfurization effects of steel, enhancing the overall performance of steel.
ASTM A193 B7 Mechanical Property
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | HBW | HRC |
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | 321 max | 35 max |
| 2-5/8 – 4 | 115 | 95 | 16 | 50 | |||
| 4-1/8 – 7 | 100 | 75 | 18 | 50 |
The minimum elongation of ASTM A193 Grade B7 stud bolts is 16%. A certain elongation indicates that the bolt has a certain plastic deformation capacity, which is very important when subjected to dynamic loads or uneven loads. It can adapt to stress changes through plastic deformation and prevent the bolt from breaking suddenly.
Application Scenarios
Oil and Gas Industry
In refineries, many equipment such as distillation towers, reactors, heat exchangers, etc. need to operate under high temperature, high pressure and possible corrosive media. ASTM A193 Grade B7 stud bolts can withstand these harsh conditions and ensure that the various components of the equipment are tightly connected to prevent leakage.
Power Industry
Thermal power plant: During the thermal power generation process, equipment such as boilers, turbines, and generators need to operate under high temperature and high pressure. Stud bolts are often used in key connection parts of these equipment, such as the connection of boiler drums, superheaters, reheaters and other components, as well as the base fixing of turbines and generators.
Chemical Industry
In chemical production, chemical reactors are one of the core equipment, and chemical reactions are often required under high temperature, high pressure and corrosive media. ASTM A193 Grade B7 stud bolts can be used to connect the reactor’s cylinder, head, pipe and other parts to ensure the normal operation of the reactor under complex working conditions and prevent safety accidents caused by loose connection parts or leakage.
