What Is Chrome-Moly Steel
/ 5 min read
Not stainless, not chrome plated. What the chromium and molybdenum actually do, and why these grades still rust.
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Grade selection, service limits and the heat treatment discipline chrome-moly demands.
Chrome-moly is unforgiving in ways carbon steel is not, and most of the trouble shows up years after fabrication rather than at hydrotest. These articles cover the parts that matter.
F11 vs F22: Choosing a Chrome-Moly Grade
/ 5 min read
Temperature, hydrogen partial pressure and cost, compared directly, including the restrictions F22 brings that F11 does not.
Grade 91 Flanges and Why Heat Treatment Decides Everything
/ 6 min read
The highest creep strength in the chrome-moly family, the narrowest processing window, and the overheating mistake that cannot be undone.
Temper Embrittlement, J-Factor and Step Cooling
/ 5 min read
Why hydroprocessing specifications restrict silicon, manganese, phosphorus and tin, and why ordinary F22 does not satisfy them.
Preheat, Interpass and PWHT for Chrome-Moly Flanges
/ 6 min read
Air hardening, martensite in the heat affected zone, and why a skipped post weld heat treatment passes hydrotest and fails later.
Sulfidation and High Temperature Corrosion
/ 5 min read
Why refinery service buys chromium, where 5Cr and 9Cr earn their premium, and the two related mechanisms that change the answer.
More technical reference material is published on Texas Flange.
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