Seamless furnace pipe with steel number<br>(1) High-quality carbon structure steel number has 20G, 20MnG, 25MnG.<br>(2) Alloy structure steel number 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.<br>(3) Rust-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni1Nb boiler tube in addition to ensuring chemical composition and mechanical properties, to do water pressure test, to expand the mouth, flattening test. The steel pipe is delivered in a heat treatment state.
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