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Alloy A193 B7 A194 2H Washers hardness requirement and preferential heat treatment

Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.

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The ASTM A193 is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. ASTM is a standards organization that tests and sets technical standards for a field of products, materials, systems, and services. ASTM standards have been adopted by many federal, state, and municipal government regulations. To be more specific, B7 alloy steel is a high temperature grade of A-193. B7 steel is also a chrome moly steel with a minimum tensile strength of 125ksi.

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