Majid Fasteners, a well-respected manufacturer and supplier based in Dubai, UAE, specializes in top-notch ASTM A193 B8 Bolts designed for high-temperature and corrosive industrial settings. Crafted from stainless steel Grade 304, these bolts offer outstanding resistance to oxidation, chemicals, and atmospheric corrosion. Majid Fasteners is committed to fully complying with ASTM specifications, ensuring dependable performance in refineries, petrochemical facilities, power plants, and marine applications. Their ASTM A193 B8 Bolts are a go-to choice for securing flanges, valves, fittings, and pressure-containing equipment. With a focus on precision manufacturing and consistent quality, Majid Fasteners delivers robust bolting solutions for critical and long-term operations.
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What is ASTM A193 B8 bolts?
ASTM A193 B8 Bolts are crafted from stainless steel Grade 304, which includes chromium (18–20%), nickel (8–11%), along with carbon, manganese, silicon, and small amounts of other alloying elements. This type of austenitic stainless steel is known for its impressive corrosion resistance, solid tensile and yield strength, and ability to withstand high temperatures. B8 bolts maintain their mechanical integrity even under significant pressure and thermal stress, showcasing remarkable ductility, toughness, and resistance to stress corrosion cracking. Their unique chemical makeup makes them perfect for both oxidizing environments and applications that demand long-lasting durability.
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ASTM A193 B8 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 |
ASTM A193 B8 bolts Specifications
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%
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ASTM A193 B8 boltsTypes
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ASTM A193 B8 bolts Uses
ASTM A193 B8 Bolts are widely utilized in industries that need fastening solutions that can resist corrosion and handle heat. You’ll often find them in refineries, petrochemical plants, and oil and gas facilities, where they’re used for flanges, valves, heat exchangers, boilers, and pressure vessels. Power plants depend on these bolts for turbine casings, steam piping, and equipment that operates at high temperatures. Thanks to their stainless steel design, they’re also well-suited for marine settings, water treatment plants, food processing facilities, and pharmaceutical machinery. B8 bolts are a go-to choice in chemical processing systems, structural assemblies, and industrial machinery that require dependable and durable fastening solutions.
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