What is ASTM A320?
ASTM A320 is a standard material specification covering alloy and stainless steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services. Supplementary requirements includes Impact properties and hardness testing of class 2 bolting materials for ASME applications.
What is L43?
ASTM A320 Grade L43 is a standard material specification for alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services. ASTM A320 Grade L43 is heat treated chromium molybdenum alloy steel (AISI 4140/AISI 4140H) with notch toughness properties.
Is ASTM A320 stainless steel?
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.
What is ASTM A193 Grade B7?
ASTM A193 Grade B7 bolts are made of chromium-molybdenum steel. The bolts are quenched and tempered (a.k.a heat treated) to develop the desired tensile strength (mechanical properties).
What is a Grade 4 nut?
ASTM A194 Grade 4 is a standard material specification for high tensile nuts and other internally threaded fasteners, made from carbon molybdenum steel. Grade 4 nuts can be produced by means of hot forging, cold forging or machining from bar stock followed by heat treatment.
What is a grade 7L nut?
The ASTM A194 Grade 7L specification covers carbon, alloy, and stainless-steel nuts intended for use in high-pressure and/or high-temperature service. Nuts up to and including 1-inch nominal size shall be UNC Series Class 2B fit.
What is the difference between L7 and B7 bolts?
ASTM A193 B7 is a Bolting specification for medium-high temperature applications. 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 is a Grade A nut?
Grade A Nuts. Strength exceeds Grade 2. ASTM A325. Bolts meet ASTM A325 Type 1 standards for structural steel joints.
What is the difference between 2H and 2HM nuts?
Both 2H and 2HM nuts have the same chemical composition. Grade 2H nuts have a higher proof load requirement. While not showing all of the sizes, this is a representative sample. Nominal Size, in.
Is B7 stronger than Grade 8?
It is also quenched and tempered at 800 F leading to its strength. Grade 8 has 0.28-0.55% carbon, 0.030% max phosphorus, and 0.050% max sulfur….Grade 8.
| GRADE | ASTM A193 B7 (Chromium Molybdenum) | GRADE 8 (Heat Treated After Threading) |
|---|---|---|
| YIELD STRENGTH | 105,000 PSI minimum minimum | 130,000 PSI minimum |
| ROCKWELL HARDNESS | C26-C32 | C33-C39 |
How big are ASTM A320 grade L43 bolts?
ASTM A320 Grade L43 bolts and threaded studs are manufactured from AISI 4340 material and are also quenched and tempered. L43 bolts can be as large as 4” in diameter, whereas Grade L7 does not exceed 2-1/2” diameter.
Which is better ASTM A320 or L7M?
L43 strength and chemical properties are virtually identical to L7 but may perform more favorably with regard to Charpy impact testing. ASTM A320 Grade L7M bolts and threaded studs are also manufactured from quenched and tempered alloy steel. The mechanical properties and requirements are lower compared to L7 bolts.
What kind of steel studs are ASTM A320?
ASME SA 320 Grade L43 Alloy Steel Stud Bolt are well-known by the clients for their durability, anti-abrasive nature and resistance against corrosion. ASTM A320 Grade L43 SS Studs is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated.
How big is the ASTM A320 manufacturing space?
With 120,000 square feet of manufacturing space we have the ability to supply large scale heavy construction projects as well as small same day specials. The ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service.