Reading list: ASTM A193 B7M
When a project needs bolts that can handle both high pressure and high heat, choosing the right grade of ASTM B7 or B7M is crucial. This quick guide breaks down the two grades by chemistry, strength, the tests they go through, and the jobs each one does best.

ASTM A193 B7M is a chromium-molybdenum steel that gets tossed into the mix whenever engineers are building oil rigs, refineries, ships, or even heavy-duty car parts.