We are a professional manufacturer of A320 Grade L43 stud bolt in china
A320 Grade L43 stud bolt is material specification for nickel-chromium-molybdenum alloy steel AISI 4340 bolts, stud bolts and studs with charpy impact testing .
ASTM A320 L43 Stud bolt is normally applied for the stud bolt size over than 2 1/2″,which is used for low temperature applications.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.
A320 Grades
| L7 Alloy steel | AISI 4140/4142 Quenched and tempered |
|---|---|
| L43 Alloy steel | AISI 4340 Quenched and tempered |
A320 L7 & L43 Stud bolt Mechanical Properties
| Grade | Size | Tensile, ksi, min | Yield, ksi, min | Charpy Impact 20-ft-lbf @ temp | Elong, %, min | RA, %, min |
|---|---|---|---|---|---|---|
| L7 | Up to 21⁄2 | 125 | 105 | -150° F | 16 | 50 |
| L43 | Up to 4 | 125 | 105 | -150° F | 16 | 50 |
A320 L7 & L43 Stud bolt Chemical Properties
| Element | L7 (AISI 4140) | L43 (AISI 4340) |
|---|---|---|
| Carbon | 0.37 – 0.49% | 0.38 – 0.43% |
| Manganese | 0.65 – 1.10% | 0.75 – 1.00% |
| Phosphorus, max | 0.035% | 0.035% |
| Sulfur, max | 0.040% | 0.040% |
| Silicon | 0.15 – 0.35% | 0.15 – 0.35% |
| Chromium | 0.75 – 1.20% | 0.70 – 0.90% |
| Nickel | 1.65 – 2.00% | |
| Molybdenum | 0.15 – 0.25% | 0.20 – 0.30% |
A320 A320 L7 & L43 Stud bolt ,Nuts and Washer recommendation
| Grade | Nuts | Washers |
|---|---|---|
| L7 | A194 Grade 4 or 7 | F436 |
| L43 | A194 Grade 4 or 7 | F436 |
ASTM Standards
A194/A194M Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service,
F436/F436M Specification for Hardened Steel Washers Inch and Metric Dimensions
F606/F606MTest Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets