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ASTM A320/A320M Grade L73 Impact Tested Alloy Steel Bolting
Specialized Low-Temperature Fasteners - Enhanced Impact Requirements
ASTM A320/A320M Grade L73 is a derivative of the L7C specification featuring enhanced impact testing protocols at -100°F for critical cryogenic installations. Sharing the same nickel-chromium-molybdenum chemistry as L7C (AISI 8740), L73 provides superior energy absorption characteristics with 20 ft-lbf minimum Charpy V-notch requirements. ASTM A320/A320M Grade L73 is essential for LNG applications, Arctic pipelines, and extreme cold climate infrastructure requiring verified low-temperature toughness.
ASTM A320/A320M Grade L73 Stud Bolts Properties
ASTM A320/A320M Grade L73 Stud Bolts Chemical Requirements
Ferritic Steels
| Grade Symbol | Description | C | Mn | P, max | S, max | Si | Ni | Cr | Mo | |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A320 L73 | Ni - Cr - Mo (AISI 8740) | Range,% | 0.38 - 0.43 | 0.75 - 1.00 | 0.035 | 0.04 | 0.15 - 0.35 | 0.40 - 0.70 | 0.40 - 0.60 | 0.20- 0.30 |
| Product Variation, % Over or Under | 0.02 | 0.04 | 0.005 over | 0.005 over | 0.02 | 0.03 | 0.03 | 0.02 | ||
ASTM A320/A320M Grade L73 Stud Bolts Mechanical Requirements
Ferritic Steels
| Class and Grade, Diameter, in. [mm] | Heat Treatment | Minimum Tempering Temperature, °F [°C] | Tensile Strength, min, ksi [MPa] | Yield Strength, min, ksi [MPa] (0.2 % offset) | Elongation in 2 in. or 50 mm, min, % | Reduction of Area, min, % | Hardness, max |
|---|---|---|---|---|---|---|---|
| ASTM A320 L73 21/2 [65] and underA | quenched and tempered | 1100 [593] | 125[860] | 105[725] | 16 | 50 | 321 HBW or 35 HRC |
ASTM A320/A320M Grade L73 Stud Bolts Impact Test Requirements
| Grade | Test Temperature | CVN Specimen Section Size, mm | Min Average Impact Toughness of Three Test Specimens, ft-lbf [J] | Min Impact Value of a Single Specimen of Set of Three, ft-lbf [J] | |
|---|---|---|---|---|---|
| °F | °C | ||||
| ASTM A320 L73 | - 100 | - 73 | 10 × 10 | 20 [27] | 15 [20] |
| 10 × 7.5 | 16 [22] | 12 [16] | |||
| 10 × 10 | 20 [27] | 15 [20] | |||
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