What is A320 material?
The ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings.
Is ASTM A320 L7 stainless steel?
Grade 660 fasteners are used in bolting boilers, pressure vessels, pipeline flanges and valves, intended for high temperature service. . ASTM A320 Grade L7 material is chemically equivalent to ASTM B638 grade 660 stainless steel alloy, also known by alloy A286 and UNS S66286, heat treated to achieve properties defined …
What is ASTM A582?
ASTM A582, 1992 Edition, October 15, 1992 – STANDARD SPECIFICATION FOR FREE-MACHINING STAINLESS AND HEAT- RESISTING STEEL BARS, HOT-ROLLED OR COLD- FINISHED. This specification covers hot-finished or cold-finished bars, except bars for forging (Note 1).
What’s the difference between B7 and L7 studs?
It is a heat treated Chromium Molybdenum steel and is considered for applications up to 450⁰ Centigrade (840⁰ Fahrenheit). L7 has the same chemical and physical properties as B7, with additional Charpy V Notch tests taken at -101⁰ Centigrade (-150⁰ Fahrenheit) for low temperature applications.
What does L7 mean on a bolt?
ASTM A320 Grade L7 is a material specification chromium- molybdenum steel, used for manufacturing of bolts, studs, stud bolts and other fasteners for bolting pressure vessels, valves, flanges and fittings for various process industries across major industrial sectors in low temperature applications services.
Can 303 Stainless be hardened?
Grade 303 stainless steel cannot be hardened by heat treatment. Solution treatment or annealing can be done by rapid cooling after heating to 1010-1120°C.
What is ASTM a580?
This specification covers stainless steel wire, except the free-machining types. It includes round, square, octagon, hexagon, and shape wire in coils only for the more commonly used types of stainless steels for general corrosion resistance and high-temperature service.
What is the difference between A320 grade B8M and Class 2 fasteners?
Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation. A320 Grade B8M bolts also do not require an impact test. ASTM A320 Grade L43 bolts and threaded studs are manufactured from AISI 4340 material and are also quenched and tempered.
What is ASTM A320 grade B8M stud bolt?
Very commonly used in the assembly of industrial pipe & valves, ASTM A320 Grade B8M Stud Bolts are considered nearly identical in chemical composition to grade 18-8 or 304 stainless steel. Email us your inquiries at [email protected]
What is ASTM A320 used for?
ASTM A320 was specially engineered for LOW temperature performance. These fasteners are commonly used for valves, flanges, fittings, and pressure vessels. ASTM A320 specifications recommend a minimum Charpy impact value all grades except for a few exclusions (listed below).
Which ASTM A320 bolts require a Charpy impact test?
A320 Grade L7 bolts larger than 1/2″ diameter require a Charpy impact test. ASTM A320 Grade B8 Class 1 bolts and threaded studs are manufactured from AISI 304 stainless steel. These bolts are heated and then water-quenched through carbide solution treatment, or solution annealing, which ensures the bolts are corrosion resistant.