There are brands on the A193 model. Each class has specific chemical requirements, strength requirements, test requirements, and applications. This system summarizes the similarities and differences between several degrees. For more information, see ASTM Basic Statement A193, which can be purchased directly from ASTM International.
Grade B7
astm a193 grade b7 bolts and threaded rods are made of Chromoly steel and are temperature and humidity controlled to achieve desired mechanical properties (strengths). Grade B7 is the standard number of A193 bolts used in construction. B7 threaded studs and short studs are available in the market. B7 bolts are often used in a flanged pipe.
These astm a320 l7 bolts are usually made and sold as lightweight and thin metal, but they are often galvanized, zinc plated, PTFE coated, or coated to prevent debris from entering. Remember that bowls with lids will not withstand the high temperatures found in bowls with a B7 top.
Grade B8
Type 304 is the standard grade of steel used in the fastener industry. Fasteners made from this austenitic stainless steel require carbide mortar after threading beams into beams or fixed head bolts. Carbide treatment, also known as solution annealing, is a process in which solvents or solvents are heated and then removed with water to ensure contamination stability. A193 Grade B8 Grade 2 Bolts are hardened after carbide treatment for high strength and low galvanizing properties. Grade 8.8 bolts are marked with the grade "B8SH".
Grade B8M
ASTM a193 grade b8 fasteners are similar to B8 grade fasteners but made of AISI 316 stainless steel and AISI 304 stainless steel. 316 stainless steel offers better corrosion protection than 304 stainless steel due to the addition of molybdenum. Grade 1B 8M binders must be treated with a carbide solution, while Grade 2 binders require additional pressure bonding to increase strength and reduce galvanic stress. Class 2 registrants are marked with class B8MSh.
Grade B7M
ASTM A193 Grade B7M bolts and studs are also chemical-grade B7 (cut and heated carbon steel) but have the lowest strength and 100% hardness requirements of any fastener produced in batches. Titanium Bolts are not resistant to chlorides, sulfides and SCC and are often used in gas lubrication systems.
Grade B16
astm a193 grade b6 are manufactured from Chrome Molybdenum Vanadium Steel. While B16 grade A193 bolts and studs have the exact strength requirements as B7 grades, the higher vanadium and temperature help the fasteners maintain their molecular structure and strength below ambient temperatures above B7 degrees. Unlike steel plate in A193 specifications, B16 plate is not corrosion resistant unless coated.
Grade B5
ASTM A193 Grade B5 Bolts and Threaded Rods are manufactured from AISI 501 stainless steel, hot and tempered for increased strength. These bolts and studs are often used in high-temperature flange connections in filthy areas.
Grade B6
ASTM A193 Grade B6 Bolts and Wire Rods are made from AISI 410 Stainless Steel, which is hot and tempered for increased strength. Since these bolts are made of stainless steel, they are used in highly polluted areas with high ambient temperatures.