Manufactures & Suppliers of Pipes, Tubes, Flanges, Pipe Fitting & Fasteners
Manufactures & Suppliers of Pipes, Tubes, Flanges, Pipe Fitting & Fasteners
Grade B7M is widely used in applications such as petroleum, sewage, water treatment, and chemical construction. The ASTM standard encompasses both alloy steel and stainless steel bolting materials designed for high-temperature or high-pressure service. This specification covers fasteners intended for use in pressure vessels, valves, flanges, and fittings. While this material is typically available in national coarse (UNC) thread pitches, traditional applications specify threads at 8 threads per inch (tpi) for diameters exceeding one inch.
ASTM A193 B7M bolts are part of a specification that addresses bolts with high tensile strength and hardness. The minimum yield strength required is 75 ksi, while the minimum tensile strength is set at 100 ksi, with a hardness of 99 HRB. Natron is a leading manufacturer and supplier of various types of ASTM A193 Grade B7M bolts, available in different dimensions and standards.
ASTM A193 Grade B7 bolts are made from chromium-molybdenum steel, offering exceptional mechanical properties, including high tensile strength and abrasion resistance, as well as resistance to various heat-related applications. Typically, these fasteners undergo quenching and tempering to enhance their performance characteristics, allowing them to be used in high-temperature environments up to 450°C (840°F).
Element | Alloy Steel |
---|---|
Chromium Molybdenum SteelA | |
CompositionB, % | |
Carbon | 0.37 - 0.49C |
Manganese | 0.65 - 1.10 |
Phosphorus | 0.035 max |
Sulfur | 0.040 max |
Silicon | 0.15 - 0.35 |
Chromium | 0.75 - 1.20 |
Molybdenum | 0.15 - 0.25 |
Diameter, inch. | Tensile Strength, min, ksi |
Yield Strength, min, 0.2% offset, ksi |
Elongation in 4D, min, % |
Reduction of Area, min, % |
Hardness, max |
---|---|---|---|---|---|
4 and under | 100 | 80 | 18 | 50 | 235 HBW or 99 HRB |
over 4 to 7, inclusive | 100 | 75 | 18 | 50 | 235 HBW or 99 HRB |