SANKIN pipes

Precision carbon steel tubes for hydraulic line service

Precision carbon steel tubes for hydraulic piping are used in a variety of industrial fields, including machine tools, construction machinery, printing machinery, refrigeration machinery, transportation machinery, agricultural machinery, automation equipment such as ships, and piping for drive equipment.
Sankin manufactures ``OST-1'' and ``OST-2'' according to the Japan Fluid Power Industry Association standards using outstanding technology and equipment. Heat treated in an atmospheric annealing furnace to keep the inside and outside of the tube clean.Furthermore, to help our customers manage their inventory and products, we sell caps in different colors based on thickness.

Standard

Chemical composition

kinds	symbol	chemical composition						Manufacturing method
kinds	symbol	C	Si	Mn	P	S	Cu	Manufacturing method
1 type	OST-1	≦0.20	≦0.35	0.25～0.60	≦0.40	≦0.40	―	E-C or S-C
2 type	OST-2	0.08～0.18	0.10～0.35	0.30～0.60	≦0.35	≦0.35	≦0.20	S-C

Mechanical properties

kinds	symbol	tensile strength (N/mm²)	Yield point or yield strength (N/mm²)	Elongation No.11 test piece(%) (%)	bending test		Push expansion test
kinds	symbol	tensile strength (N/mm²)	Yield point or yield strength (N/mm²)	Elongation No.11 test piece(%) (%)	bending angle	inner radius	Push expansion test
1 type	OST-1	≦440	≧175	≧35	180°	Outer diameter ×4	"Outer diameter ×1.2
2 type	OST-2	≦440	≧195	≧35	180°	Outer diameter ×4	"Outer diameter ×1.2

Dimensional tolerance

Outer diameter(mm)			thickness(mm)			length(mm)
≦25	25＜～≦38	38＜～≦50	1.0≦～＜1.5	1.5≦～＜2.0	≦2.0	≦6,000	＞6,000
±0.10	±0.15	±0.20	±15％	±0.20	±10％	+10，-0	+15，-0

Heat exchanger tubes with integral fins/Corrugated

Sankin's fin tube uses high-frequency resistance to spirally weld the fins to the tube.
It is used in waste heat recovery boilers and small once-through boilers for thermal power generation, and has received high praise.