Size In Ready Stock
- L7 Stud Bolts = M3 To M80
ASTM A320 Grade L7 material made from chromiummolybdenum steel. ASTM A320 Grade L7 stud bolts have classes A, B, C and D. A320 l7 bolts are specially designed for low temperature applications. A320 L7 full threaded stud bolts is manufactured from AISI 4140 and AISI 4140H base material and is supplied in a quenched and tempered condition.
Table of Content
Most important Documents to Import ASTM A320 Grade L7 Stud Bolts in Mexico
Shipping Location
Celanese
Hanwha Chemical
ASTM A320 Grade L7 Specification
Size In Ready Stock
Grade L7 Stud Bolts Threads
Manufacturing Technique
Characteristics
Testing Requirements
Use For
Available Packaging
Raw Material Origin
A320 Grade L7 stud bolts is used in pharmaceutical, petrochemical, food production, marine engineering, oil and gas and in low temperature applications where extreme hardness are needed. Having more than 11 years of experience as L7 stud bolts manufacturer, our wide range of A320 Gr.l7 double end stud bolts comes in custom size.
Tensile Class of ASTM A320 Grade L7 Stud Bolts
ASTM A320 Grade L7 Class A
ASTM A320 Grade L7 Class B
ASTM A320 Grade L7 Class C
ASTM A320 Grade L7 Class D
A320 L7 Bolts Stress Rupture Requirements
| Tensile Class | ASTM A320 L7 A, B and C | ASTM A320 L7 D |
|---|---|---|
| Test Temperature | 1200°F | 1200°F |
| Stress (minimum) | 56 ksi | 40 ksi |
| Time to Rupture (minimum) | 100 h | 100 h |
Hardness for A320 Grade L7 Material
| Tensile Class | A320 Gr L7 A, B and C | A320 Gr L7 D |
|---|---|---|
| Brinell Hardness | 248 to 341 | 248 to 321 |
| Rockwell Hardness B & C | 24 to 27 HRC | 24 to 35 HRC |
ASTM A320 Grade L7 Yield Strength
| A, B and C | D |
|---|---|
| 85 ksi | 105 ksi |
| 585 MPa | 725 MPa |
A320 Gr.L7 Equivalent
DIN (Germany)
American (UNS)
USA (Werkstoff No)
Italy (UNI)
Spain (UNE)
France (AFNOR)
ASTM A320 Grade L7 Torque Chart
| A4 70 Bolt Size | Torque (N-m) | |
|---|---|---|
| Lubricated | Dry | |
| M3 | 0.9 | 1.0 |
| M4 | 2.3 | 2.6 |
| M6 | 7.8 | 8.7 |
| M8 | 19.1 | 21.2 |
| M10 | 38 | 42 |
| M12 | 66 | 73 |
| M14 | 106 | 118 |
| M16 | 162 | 180 |
| M18 | 232 | 258 |
| M20 | 333 | 370 |
| M22 | 437 | 485 |
| M24 | 543 | 603 |
Chemical Comparison of L7 Stud Bolts
| Element | ASTM A320 Grade L7 | ASTM A193 Grade B7 |
|---|---|---|
| Manganese | 0.65 - 1.10% | 0.65 - 1.10% |
| Silicon | 0.15 - 0.35% | 0.15 - 0.35% |
| Chromium | 0.75 - 1.20% | 0.75 - 1.20% |
| Molybdenum | 0.15 - 0.25% | 0.15 - 0.25% |
| Carbon | 0.37 - 0.49% | 0.37 - 0.49% |
| Phosphorus, max | 0.035% | 0.035% |
| Sulfur, max | 0.040% | 0.040% |
Temperature Range of A320 Grade L7 Material
Temperature range of ASTM A320 Grade L7 stud bolts is -101°C to 204°C
A320 Grade L7 Mechanical Properties
| Class | Minimum | Reduction of Area, (minimum) | Elongation in 4D (minimum) | |
|---|---|---|---|---|
| Tensile | Strength | |||
| ASTM A320 L7 A, B and C | 130 ksi | 895 MPa | 18% | 15 % |
| ASTM A320 L7 D | 130 ksi | 895 MPa | 18% | 15 % |
Recommended Nuts and Washers for Grade L7 Bolt
Nuts
Washer
Types Of ASTM A320 L7 Stud Bolts
ASTM A320 Grade L7 Full Threaded Stud Bolts
A320 Grade L7 Tap End Stud Bolts
Grade L7 Double End Stud Bolts
L7 Reduced Shank Stud Bolts
SA 320 Grade L7 Weld Studs Bolts
ASME SA320 Gr L7 Threaded Studs