https://www.made-in-china.com/products-search/hot-china-products/Oil_Line_Steel_Pipe.html
China Oil Line Steel Pipe, Oil Line Steel Pipe Wholesale, Manufacturers, Price | Made-in-China.com
China Oil Line Steel Pipe wholesale - Select 2026 high quality Oil Line Steel Pipe products in best price from certified Chinese Steel Tube manufacturers,...
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https://www.usitc.gov/investigations/701731/2023/seamless_carbon_and_alloy_steel_standard_line_and/adequacy.htm
Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from Germany | United States...
The United States International Trade Commission is an independent, nonpartisan, quasi-judicial federal agency that fulfills a range of trade-related mandates....
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https://www.astm.org/membership-participation/technical-committees/workitems/workitem-wk95214
WK95214 - Withdrawal of A1024/A1024M-18 Standard Specification for Steel Line Pipe, Black,...
ASTM International - Standards Worldwide