ASTM A320 Specification Suppliers, Manufacturers
ASTM A320 Specifications covers premium Alloy Steel bolting Solutons for use in Flanges,valves,Fittings & pressure vessels.TorqBolt Manufactures, Stocks & Supply these Bolt Fasteners in various sizes & Coatings.
For quick Quote/Information on A320 Bolts/Studs, please contact our Sales team.
Related Keywords for ASTM A320 : ASTM A320 Specification,A320 Bolts,A320 Grade L7 Bolts,A320 Grade L43 Bolts,A320 Grade B8 Bolts etc.
Grades
L7 | AISI 4140/4142 Quenched and tempered |
---|---|
L43 | AISI 4340 Quenched and tempered |
B8 Class 1 | AISI 304, carbide solution treated |
B8 Class 2 | AISI 304, carbide solution treated, strain hardened |
B8M Class 1 | AISI 316, carbide solution treated |
B8M Class 2 | AISI 316, carbide solution treated, strain hardened |
Mechanical Properties
Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | Charpy Impact 20-ft-lbf @ temp |
---|---|---|---|---|---|---|
L7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | -150° F |
L43 | Up to 4 | 125 | 105 | 16 | 50 | -150° F |
B8 Class 1 | All | 75 | 30 | 30 | 50 | N/A |
B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | N/A |
7/8 - 1 | 115 | 80 | 15 | 35 | N/A | |
1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | N/A | |
1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | N/A | |
B8M Class 1 | All | 75 | 30 | 30 | 50 | N/A |
B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 | N/A |
7/8 - 1 | 100 | 80 | 20 | 45 | N/A | |
1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | N/A | |
1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 | N/A |
Material Chemical Composition
Element | L7 (AISI 4140) | L43 (AISI 4340) | B8 (AISI 304) | B8M (AISI 316) |
---|---|---|---|---|
Carbon | 0.37 - 0.49% | 0.38 - 0.43% | 0.08% max | 0.08% max |
Manganese | 0.65 - 1.10% | 0.75 - 1.00% | 2.00% max | 2.00% max |
Phosphorus, max | 0.035% | 0.035% | 0.045% | 0.045% |
Sulfur, max | 0.040% | 0.040% | 0.030% | 0.030% |
Silicon | 0.15 - 0.35% | 0.15 - 0.35% | 1.00% max | 1.00% max |
Chromium | 0.75 - 1.20% | 0.70 - 0.90% | 18.0 - 20.0% | 16.0 - 18.0% |
Nickel | 1.65 - 2.00% | 8.0 - 11.0% | 10.0 - 14.0% | |
Molybdenum | 0.15 - 0.25% | 0.02 - 0.30% | 2.00 - 3.00% |
Recommended Nuts & Washer
Bolt Grade | Nuts | Washers |
---|---|---|
L7 | A194 Grade 4 or 7 | F436 |
L43 | A194 Grade 4 or 7 | F436 |
B8 Class 1 | A194 Grade 8 | SS304 |
B8 Class 2 | A194 Grade 8 | SS304 |
B8M Class 1 | A194 Grade 8M | SS316 |
B8M Class 2 | A194 Grade 8M | SS316 |