Fastener grades play an integral part in ensuring the safety and reliability of construction and engineering projects, so engineers and project managers must take great care in selecting bolts to fit various conditions such as operating temperatures, pressures and exposure to corrosive elements.
ASTM A193 Grade B7 covers alloy steel bolts designed for high temperature/pressure applications, such as valves and flanges. Boltport uses AISI 4140 bar stock and forging to produce both headed and non-headed B7 bolts for high temperature/pressure environments.
High Tensile Strength
[URL="https://www.dalloyedfasteners.com/astm-a193-grade-b7-bolts.html"] ASTM A193 Grade B7 bolts [/URL] are widely utilized for high-temperature and high-pressure applications, often in industries like oil & gas, power generation, manufacturing and construction. Their superior strength and durability make them an attractive option that engineers and procurement specialists should understand as part of ensuring they are selected and maintained appropriately.
B7 bolts are made of chromium-molybdenum alloy steel and go through heat treatment to produce their high tensile strength. Their tensile strength surpasses other grades of steel and is strong enough to withstand high temperatures and pressures without bending or breaking, making them suitable for demanding applications such as pipe flange connections.
ASTM A193 B7 bolts come in two grades: A193B7 and A193B7M. A193B7 is quenched and tempered medium carbon alloy steel with minimum tensile strengths up to 100ksi for sizes up to 4". In comparison, A193B7M features lower hardness requirements than B7 but requires 100% of manufactured bolts from each lot to be hardness tested before being shipped out for sale; additionally it resists chloride-sulfide-hydrogen stress corrosion cracking (SCC). A193B7M can often be found used in sour gas service as it resists chloride-sulfide-hydrogen stress corrosion cracking (SCC).
B7 bolts typically come with a plain bare metal finish; however, for increased corrosion resistance they can also be galvanized, zinc-plated, Xylan coated or PTFE coated to Xylan or PTFE coating standards such as A194 Grade 2H for optimal use.
Corrosion Resistance
ASTM A193 Grade B7 bolts are constructed from corrosion-resistant chromium-molybdenum alloy steel. As their name implies, these bolts offer exceptional corrosion protection in harsh environments and are an ideal choice for valves, flanges and pressure vessels.
These fasteners can withstand both high temperatures and mechanical stresses, making them ideal for power generation applications such as securing boilers and steam turbines, as well as construction projects to affix load-bearing structures.
Both B7 and B7M bolts offer resistance against hydrogen embrittlement, making them suitable for use in sour gas environments. Furthermore, these bolts have excellent chloride stress corrosion cracking (SCC) resistance. Although not typically recommended in freshwater applications, these can still be utilized successfully when exposed to marine environments with proper care.
A193 B7 bolts typically pair well with A194 nuts; however, these fasteners may also be combined with different nuts to meet specific application needs. Any additional standards or specifications that may be necessary should be communicated directly to the supplier in order to ensure compliance.
Lightning Bolt provides ASTM A193 compliant bolts, threaded rod and studs of any size to meet all your fastening needs, from B7 heavy hex bolts and threaded rod to stainless steel grades for corrosion-resistant fasteners to our wide variety of finishes and coatings that offer increased corrosion resistance in harsh environments.
Our high strength fasteners come in sizes and styles tailored specifically for ASTM standards with features like stainless steel grades as well as finishes and coatings which offer increased corrosion resistance in harsh environments.
Versatility
Industrial fasteners come in all shapes and sizes. Each features unique properties tailored to its environment that ensure safety, durability, and performance - with ASTM A193 specification serving as an exemplary example of engineering precision and excellence in this wide field.
Bolting grade N is designed to withstand high temperatures and pressures, making it an essential component in many oil and gas projects.
Constructed with chromium-molybdenum alloy steel composition for strength as well as resistance against volatile environments.
The A193 B7 bolt stands out with its robust mechanical properties and versatility; it can be used to install components such as valves, flanges and pressure vessels. Its great versatility stems from its wide array of applications as well as high tensile strength and corrosion resistance properties.
Boltport provides <a href="https://www.dalloyedfasteners.com/astm-a193-grade-b7-bolts.html">ASTM A193 Grade B7 bolts</a> bolting specifications in various dimensions to meet ASTM A193's bolting specification requirements, with bolt sizes from 1/4 inch up to 8 inches available in both metric and imperial measurements. Manufactured from quenched and tempered chromium-molybdenum steel, these bolts boast minimum tensile strengths of 125ksi for extra corrosion protection in harsh environments such as hot-dip galvanizing or black oxide finishes for further corrosion protection against corrosion.
Safety
Handling and installing high-performance fasteners properly to avoid accidents. Bolts must meet rigorous specifications that include tensile strength, yield strength, elongation rate reduction of area and hardness in order to withstand demanding industrial environments characterized by extreme temperatures and pressure conditions. These standards ensure the bolts can withstand such environments.
When choosing bolts for any project, it's essential to understand all of the available grades. While they may appear similar in terms of tensile and yield strengths, there are distinct variations among grades.
For example, Grade 5 and B7 threaded rods share similar tensile and yield strengths but differ significantly in materials used and heat-treating processes; Grade 5 bolts are composed of medium carbon steel that goes through quenching and tempering processes while B7 rods use chromium-molybdenum alloy steel that ensures superior strength in volatile environments.
Grade B7 bolts and studs are commonly utilized in applications involving high temperatures, intense mechanical stress, such as petrochemical equipment, pressure vessels, pipeline flange connections and other structures that encounter extreme conditions.
Common applications of Grade B7 fasteners include petrochemical equipment, pressure vessels, pipeline flange connections and other structural applications that involve corrosion protection coatings like PTFE for improved corrosion resistance; they can also be galvanized or coated with chrome molybdenum vanadium to further increase durability.
It is crucial that when using Grade B7 fasteners that the appropriate nut must match its grade; ASTM A194 Grade 2H nuts are usually preferred as they offer higher tolerance and lower manufacturing cost than their counterparts.
Posted by: steel456 @ July 2, 2025, 10:35 a.m.