alloy steel ASTM A194 2H hex head nut ASME B18.2.2

ASTM specifications recommend a minimum Charpy impact value for ASTM A320 L7 Stud Bolts to be 20-ft-lbf @ -150F. The Charpy impact test determines the total amount of energy that is absorbed by a material during fracture, thereby indicating the material¡¯s notch toughness.

ASTM A193 B7 is a chromium molybdenum alloy steel. B7 achieves its strength through a heat treatment process that is quenched and tempered at 1150 degrees Fahrenheit.

The ASTM A320 Grade L7 specification covers stainless steel bolting materials for low temperature service. This standard cover rolled, forged, or strains hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings.

Bolts and bolts are used in many applications in almost all industrial applications.

They have a minimum yield strength of 105ksi. There are different types of bolts and bolts for different types of applications such as ASTM A193 gr b7 hex bolts.

The grade mark consists of the grade symbol “2H” and the manufacturer’s identification mark.

ASTM A320 L7 Stud Bolts are designed for low temperature performance. These fasteners are commonly used in valves, flanges, fittings and pressure vessels. The ASTM specification recommends a minimum impact value of 20-ft-lbf -150F for ASTM A320 L7 studs.

Grade 2H nuts are recommended for use with bolts in high-pressure and high-temperature applications. They are made from steel with the following chemical composition: Carbon: 0.4% min; Manganese: 1.0% max; Phosphorus: 0.04% max; Sulfur: 0.05% max; Silicon: 0.40% max. Grade 2H Nuts are heat-treated and have a Core Hardness of Rockwell C24-C38.

ASTM A194 Grade 2H Nut is a carbon based steel heavy duty nut. It is a commonly used high strength nut.

The ASTM A194 specification covers carbon, alloy and stainless steel bolts for high pressure and/or high temperature service.

The high lead content in STM A320 grade L7M AS bolts results in relatively low ductility and plasticity.

The ASTM A320 specification, originally approved in 1948, covers alloy steel and stainless steel bolting materials for low temperature service.

ASTM A193 Grade B7 is the standard material specification for chromium-molybdenum alloy steel fasteners for high-strength, high-temperature, and special-purpose applications. Grade B7 is a heat treated chromium molybdenum alloy steel with a minimum tensile requirement of 100 ksi, a yield strength of 75 ksi and a maximum hardness of 35 HRC. The ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat treatment, and recommended nut washers for Class B7 fasteners. ASTM A193 Grade B7 is the broadest specification for fasteners, commonly found in bolts or pipes, pressure vessels, valves, flanges and fittings.

A320 Gr L7 studs are subject to certain mandatory mechanical tests, namely: tensile test, impact test and hardness test.

This is useful for selecting bolts with different strength levels for different high pressure and high temperature applications. ASTM A193 grade b7 hex bolts and other types have a minimum tensile strength of up to 125ksi.

ASTM A194 Grade 2H bolts are high strength bolts made from carbon steel.

Fasteners made from this austenitic stainless steel require carbide solution treatment of the bar to be threaded, or carbide solution treatment after the head operation of bolts with forged heads.

La especificacion ASTM A193 Grado B7 cubre los requisitos para materiales de empernado de acero aleado de alta resistencia para servicio de alta temperatura o alta presion y otras aplicaciones de proposito especial. Es una especificacion estandar que define la composicion quimica tipica, las propiedades mecanicas, los requisitos de dureza, el tratamiento termico preferencial, el marcado del producto, la certificacion y otros requisitos para las conexiones atornilladas utilizadas en el servicio de recipientes a presion, valvulas, bridas y accesorios. ASTM A193 define unidades SI (metricas) y pulgadas-libras.

ASTM A193 Grade B7 specification covers the requirements for high strength alloy steel bolting materials for high temperature or high pressure service and other special purpose applications. It is a standard specification that defines typical chemical composition, mechanical properties, hardness requirements, preferential heat treatment, product marking, certification, and other requirements for bolted connections used in pressure vessel service, valves, flanges, and fittings. ASTM A193 defines SI (metric) and inch-pound units.

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.

B7 and B7M shall be heat treated by quenching in a liquid medium and tempering. For B7M fasteners, the final heat treatment, which may be the tempering operation if conducted at 1150 ¡ãF [620 ¡ãC] minimum, shall be done after all machining and forming operations, including thread rolling and any type of cutting.

ASTM A194 2H Heavy Duty Hex Bolts are the core product and are in stock. HT PIPE is a leading supplier of ASTM A194 2H Heavy Duty Hex Nuts. These are heavy duty hex nut type bolts as directed by ASTM A-193 specification.

Grades 7, 7M, 8 and 8M have 8-10% nickel added. Grade 8 material lacks molybdenum, but Grade 8M ASTM A194 2h material contains all the elements mentioned in the composition, making it the strongest and most expensive class of materials in this grade.

Producing Standard
ASME B18.2.2
DIN 934 

ASTM A193 Grade B7 bolts are considered for applications up to 450¡ãC due to heat treated chrome molybdenum steel. B7 stud bolts are bolts with male threads and a hex head designed to be actuated by a wrench. It can be fully threaded or partially threaded and is supplied with a hex cap.

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC.

ASTM A320 bolts are suitable for low temperature service down to -150¡ãF and have a minimum Charpy impact value of 20-ft-lbf at this temperature. ASTM A320 Hex Bolts must obtain the durability and service of high temperature or high pressure and corrosion resistant steel. ASTM A320 Stud Bolts are available in different sizes and patterns, our premium ASTM A320 Grade L7 AS Bolts are in high demand in the market due to their speculative properties and specifications.

A194 2H Heavy Duty Hex bolts are designed for high strength, high temperature or high pressure applications and are usually available in a plain finish.

The material is made up of carbon, manganese, phosphorus, sulfur, silicon, chromium and molybdenum in the composition.

B8M Grade 1 fasteners require carbide solution treatment, while Grade 2 fasteners require additional strain hardening operations to increase strength and reduce susceptibility to wear.

ASTM A193 Grade B7 specification covers the requirements for high strength alloy steel bolting materials for high temperature or high pressure service and other special purpose applications. It is a standard specification that defines typical chemical composition, mechanical properties, hardness requirements, preferential heat treatment, product marking, certification, and other requirements for bolted connections used in pressure vessel service, valves, flanges, and fittings. ASTM A193 defines SI (metric) and inch-pound units.