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ASTM A193 B7 / B7M and ASTM A320 L7 / L7M are standard chromium-molybdenum alloys steels used globally in the Oil & Gas and Petro-chemical industries. With near-identical chemical properties, B7 and L7 differ in their testing requirements - ASTM A320 L7 bolting is specified for low-temperature service, and as such has additional impact-testing requirements. The "M" suffix designates a lower maximum hardness and tensile strength. This may be beneficial when bolting is specified for sour gas service to mitigate the risk of embrittlement.
At Bolt King, we are adept at manufacturing B7 / B7M / L7 / L7M bolting on-site, manufacturing bolts, studbolts, Socket Head Cap Screws, and any other special requirement. Our current range for hot-forging these products is M6 - M48.
If you have any questions or queries with regard to ASTM specification petro-chemical bolting, please contact us.
Chemical Properties - A193 B7/B7M
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu | W | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Min |
0.37 | 0.65 | - | - | 0.15 | 0.75 | - | 0.15 | - | - | - | - |
| Max | 0.49 | 1.10 | 0.035 | 0.040 | 0.35 | 1.20 | - | 0.25 | - | - | - | Bal |
Mechanical Properties - A193 B7
| Ultimate Tensile Strength (Min) | Yield Strength (Min) | Elongation (Min) | RoA (Min) | Hardness |
|---|---|---|---|---|
| 860 MPa | 720 MPa | 16 | 50 | 35 HRC Max |
Mechanical Properties - A193 B7M
| Ultimate Tensile Strength (Min) | Yield Strength (Min) | Elongation (Min) | RoA (Min) | Hardness |
|---|---|---|---|---|
| 690 MPa | 550 MPa | 18 | 50 | 22 HRC Max |
The information provided above is for reference only. Please contact us for further information.
Special Fasteners In Exotic Alloys, Including
Inconel & Super Duplex
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