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Four-Quadrant Hardness Testing for Oilfield Steel Bars — Uniform Quality Control by SHUNFU METAL

By Harris — Technical Staff, SHUNFU METAL Why Uniformity Matters More Than Peak Strength For API 7 drilling tools and API 6A Christmas tree components, material requirements leave no room for compromise. Drill collars machined from Cr-Mo bars—typically AISI 4145H MOD with a specified hardness range of 285–341 HBW—descend thousands of meters downhole, absorbing torsion,

2026-07-21T06:10:26+00:00July 21st, 2026|Company News|
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ShunFu Metal Co., Ltd. is one of the largest high quality oilfields product manufacturers in China, and its products cover various oilfields such as gas pipe, oil casing, tubing, anti-corrosion line pipe, corrosion resistance alloy pipe, etc. …
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