Variety	Specifications		Steel grade/steel grade	Executive standards	Typical use
Variety	Outer diameter (mm)	Wall thickness (mm)	Steel grade/steel grade	Executive standards	Typical use
Structural pipe	48.00~765.00	3.50~120.00	10, 20, 35, 45, Q345, Q390, Q420, Q460, Q500, Q550, Q690, 20Cr, 40Cr, 27SiMn, 15CrMo, 20CrMo, 30CrMo, 35CrMo, 42CrMo, 20CrNiMo, 20CrMnMo, 40CrMnMo, 40CrNiMo, 30CrMnSiA, 35CrMnSiA, 20CrMnTi, etc	GB/T8162	Machined parts, structural parts, pipe fittings, etc.
Structural pipe	48.00~765.00	3.50~120.00	1020, 1026, 1035, 1045, 4130, E355, E470, etc	ASTMA519EN10297	Machined parts, structural parts, pipe fittings, etc.
Fluid pipe	48.00~765.00	3.50~120.00	10, 20, Q345, Q390, Q420, Q460, etc	GB/T8163	Transport of general gas liquid
Non-alloy, fine grain structural tube	48.00~765.00	3.50~120.00	S275JOH, S355K2H, S460NH, S275J2H, S355JOH, S355J2H, S355NH, S355NLH, etc.	EN10210	For public facilities such as bridges, stadiums, airports, offshore wind power and mechanical engineering
Hydraulic Strut Tube	48.00~765.00	3.50~120.00	20, 35, 45, 27SiMn, 30CrMnSiA, 35CrMnSiA, S890, etc	GB/T17396 Technical Agreement	Hydraulic Strut
Geological drilling pipe	48.00~765.00	3.50~120.00	DZ40, DZ50, DZ55, DZ60, STM-R780G, S, etc	YB/T5052Q/OHAD006-2023 Technical Agreement	Geological drilling
Automobile axle tube	48.00~765.00	3.50~120.00	45, 18Mn2, 20Mn2, 25Mn, 27Mn2, 45Mn2, 40MnB, 40Cr, SAE1527, E460, E620, CZ450S, CZ530S, etc	YB/T5035Q/OHAD041-2019 Technical Agreement	Pipe materials for automobile axles and auto parts
Crane boom tube	48.00~765.00	3.50~120.00	HSM450, HSM770, HSM890, HSM960, HSM1020, S355, Q390, Q460, Q690, etc.	GB/T30584-2014Q/OHAD015-2008 Technical Agreement	Load-bearing trusses for crawler cranes, truck cranes, and port machinery equipment cranes
Hollow mandrel tube	318.00~720.00	50.00~120.00	42CrMo, 30Cr3MoV, etc	Q/OHAD002-2010	Manufacture of hollow mandrel
Pipe for pipe mould	Dn200	Dn600	21CrMo10, etc.	Technical Agreement	Manufacture of centrifugal casting pipe mould
High-end construction pipe	200.00 x200.00	10.00~45.00	Q345, Q390, Q420, etc.	Technical agreement	Building components
Pumping pipe	48.00~368.00	3.50~42.00	20, Q345B, 45Mn2, NM50, NM55, HS-1, H65, etc	Technical agreement	Manufacture of pump truck conveying pipeline
Pipe for oil cylinder	48.00~765.00	3.50~120.00	20, 45, 25Mn, Q345B, Q345D, 27SiMn, 20MnTiB, 26MnNbTi, E355, E355S, 20MnV6, 20MnTiB, S550, S690, S720, S790, XG850, S890, 30CrMnSiA, etc.	Q/OHAD032-2019 Technical agreement	Manufacturing hydraulic cylinder
Rotary drilling pipe	48.00~765.00	3.50~120.00	Q345B, 27SiMn, 30CrMo, 35CrMo, HG550, HG650, HG850, etc	GB/T34109-2017Q/OHAD037-2019 Technical Agreement	Manufacture of rotary drilling pipe
Petroleum machining pipe	48.00~765.00	3.50~120.00	4130, 4140, K55, L80-1, T95-1, P110, C110, 13Cr, Q125-1, R95, 35CrMo, 42CrMo, SCM440TK, etc.	API5CT, ASTMA519, technical agreement	Manufacture of oil clothing parts

Seamless Steel Tube for Machining