Majid Fasteners has established itself as a prominent publisher and supplier of high-quality Fasteners in Dubai, UAE. Our products provide high-performance solutions across multiple sectors and industries, focusing on complying with ASNT A193 B7 specifications and providing Alloy Steel Fasteners designed for maximum tensile strength and maximum heat and pressure resistance. Through advanced manufacturing techniques and strict quality control processes, we are committed to meeting the demands of our customers by supplying timely deliveries in the Oil and Gas, Construction, Petrochemical, and Heavy Engineering sectors. We provide quality fasteners that meet international standards and custom requirements on every project.
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What is ASTM A193 B7 Bolts?
Quenched and tempered chromium-molybdenum alloy steel is used to create ASTM A193 B7 bolts; because of the quality, ASTM A193 B7 bolts will have superior strength and thermal resistance in critical applications (e.g., safety or security). The typical chemical composition of these bolts contains carbon (C), manganese (Mn), silicon (Si), chromium (Cr), and molybdenum (Mo), ensuring robustness and durability. In general, the mechanical characteristics of these types of fasteners have a high ultimate tensile strength (UTS), high yield point (YP), and good hardness value, making them an excellent choice for high-temperature environments. Additionally, the enhanced heat treat process makes ASTM A193 B7 bolts more resistant to wear and to reduce deformation when stressed. Under load, ASTM A193 B7 fasteners can provide consistent performance; so, this type of fastener is often used in demanding applications in both industry and construction.
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ASTM A193 B7 Bolts Specifications
Material | Specification | Standards | Size | Length |
ASTM A193 B7 Bolt | IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
ASTM A193 B7 Bolts Chemical Composition
| Element | B7 | B8 | B8M |
| Carbon | 0.37 – 0.49% | 0.08% max | 0.08% max |
| Manganese | 0.65 – 1.10% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 – 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.75 – 1.20% | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel | 8.0 – 11.0% | 10.0 – 14.0% | |
| Molybdenum | 0.15 – 0.25% | 2.00 – 3.00% |
ASTM A193 B7 Bolts Mechanical Properties
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
| 2-5/8 – 4 | 115 | 95 | 16 | 50 | |
| 4-1/8 – 7 | 100 | 75 | 18 | 50 | |
| B8 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 |
| 7/8 – 1 | 115 | 80 | 15 | 35 | |
| 1-1/8 – 1-1/4 | 105 | 65 | 20 | 35 | |
| 1-3/8 – 1-1/2 | 100 | 50 | 28 | 45 |
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Types of ASTM A193 B7 Bolts
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ASTM A193 B7 Bolts Uses
Many industries use ASTM A193 B7 bolts in applications requiring both high strength and durability. These bolts have become very popular in the Oil and Gas industry for use with pipeline flanges, drilling equipment, and refinery equipment. Additionally, these bolts are used in Power Generation Plants to fasten Boilers, Turbines, and Heat Exchangers because A193 B7 bolts have exceptional resistance to thermal stress. Other industries include Chemical, Petrochemical, Construction, Heavy Engineering, Valves, Pumps and Industrial Machinery, all of which utilize A193 B7 bolts to ensure secure fastening under extreme operating conditions as well as to provide long-term stability and safety in difficult applications.
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