套管油管
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中国使用的另一种钢管道是合金钢。这种钢比碳钢更昂贵，但也更耐腐蚀和耐热。合金钢有多种牌号可供选择，包括 A335、A387 和 A691。
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Casing Tubing Oil Casing
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Another type of Steel piping used in china is alloy steel. This type of steel is more expensive than Carbon steel, but it is also more resistant to corrosion and heat. Alloy steel is available in a variety of grades, including A335, A387, and A691.
