ASTM A320 Grade L7 Specifications
ASTM A320 Grade L7M Specifications
ASTM A320 GR.L7
ASTM A320 GR.L7M
Full thread Studs, Bolts.
Grade L7M is a heat-treated chromium- molybdenum alloy steel with minimum tensile requirement of asper Table below.
ASTM A320 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatmen., Recommended ASTM A194Gr. 7 & 7M nuts.
Chemical Requirements @AISI 4110
|
Elements |
Range |
Product Variation, Over or Under |
Carbon |
0.37 – 0.49 |
0.02 |
Manganese |
0.65 – 1.10 |
0.04 |
Phosphorus, max |
0.035 |
0.005over |
Sulphur, max |
0.040 |
0.005over |
Silicon |
0.15-0.35 |
0.02 |
Chromium |
0.75-1.20 |
0.05 |
Molybdenum |
0.15-0.25 |
0.02 |
Mechanical Requirements- @Inch Sizes [Metric Sizes]
Grade |
Diameter, Inch/Metric |
Heat Treatment |
Tensile Strength, Min, ksi [MPa] |
Yield Strength, Min, 0.2%offset, ksi [MPa] |
Elongation In 4D,Min, % |
Reduction of Area, Min, % |
L7 |
2.5″ / M65 and under |
Quenched & Tempered |
125 [860] |
105[725] |
16 |
50 |
L7M |
2.5″ / M65 and Under |
Quenched & Tempered @ 1150 [620] min. |
100 [690] |
80 [550] |
18 |
50 |
ASTM A320 L7MHardness – Max. |
||
2.5″/M65 and under |
200-235 HB |
93-99 HRB |