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- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
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ASTM A320/A320M Grade L7C Nickel-Chromium-Molybdenum Bolting
High-Strength Low-Temperature Fasteners - AISI 8740 Alloy Steel
ASTM A320/A320M Grade L7C represents a premium nickel-chromium-molybdenum alloy steel specifically designed for critical low temperature bolting service. With tensile strength of 125 ksi and yield strength of 105 ksi, L7C delivers exceptional mechanical performance in diameters up to 2-1/2 inches. The addition of 0.40-0.70% nickel and 0.20-0.30% molybdenum provides enhanced hardenability and impact resistance tested at -150°F.
ASTM A320/A320M Grade L7C Stud Bolts Properties
ASTM A320/A320M Grade L7C Stud Bolts Chemical Requirements
Ferritic Steels
| Grade Symbol | Description | C | Mn | P, max | S, max | Si | Ni | Cr | Mo | |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A320 L7C | 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 L7C 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 L7C 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 L7C Stud Bolts Impact Test h3 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 L7C | - 150 | - 101 | 10 × 7.5 | 16 [22] | 12 [16] |
| 10 × 10 | 40 [54] | 30 [41] | |||
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