Boiler tubes are open at both ends and have a hollow section. Boiler tubes are a type of seamless tubes. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements on the steel type used in the manufacture of the steel pipe. According to the use temperature, it is divided into two types: general boiler tube and high pressure boiler tube.

Steel Grade
(1) The steel grades of high-quality carbon structural steel are 20G, 20MnG, and 25MnG.
(2) Alloy structural steel Steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.
(3) 1Cr18Ni9 and 1Cr18Ni11Nb boiler tubes commonly used in rusty and heat-resistant steels must be subjected to hydrostatic tests one by one, flaring and flattening tests in addition to ensuring chemical composition and mechanical properties. Steel pipes are delivered in a heat-treated state.
In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.

Product name	Material	Standard	Size(mm)	Application
Low temperature tube	16MnDG 10MnDG 09DG 09Mn2VDG 06Ni3MoDG ASTM A333	GB/T18984- 2003 ASTM A333	OD:8-1240* WT:1-200	Apply to – 45 ℃ ~ 195 ℃ low temperature pressure vessel and low temperature heat exchanger pipe
High-pressure boiler tube	20G ASTMA106B ASTMA210A ST45.8-III	GB5310-1995 ASTM SA106 ASTM SA210 DIN17175-79	OD:8-1240* WT:1-200	Suitable for manufacturing high pressure boiler tube, header, steam pipe, etc
Petroleum cracking tube	10 20	GB9948-2006	OD: 8-630* WT:1-60	Used in oil refinery furnace tube, heat exchanger tube
Low medium pressure boiler tube	10# 20# 16Mn,Q345	GB3087-2008	OD:8-1240* WT:1-200	Suitable for manufacturing various structure of low and medium pressure boiler and locomotive boiler
General structure of the tube	10#,20#,45#,27SiMn ASTM A53A,B 16Mn,Q345	GB/T8162- 2008 GB/T17396- 1998 ASTM A53	OD:8-1240* WT:1-200	Apply to the general structure, engineering support, mechanical processing, etc
Oil casing	J55,K55,N80,L80 C90,C95,P110	API SPEC 5CT ISO11960	OD:60-508* WT:4.24-16.13	Used for extraction of oil or gas in oil Wells casing, used in oil and gas well sidewall