Galvanized Carbon Precision Seamless Steel Pipe Factory

Production Introduction:

Shape: Round

Standard: EN10305-4 (DIN2445/2), EN10305-1 (DIN2391/C), GB/T3639, ASTM A179

Material: ST37.4,ST35,ST45,ST52,E235,E355

Salty spray test: ≥ 120hours

Size: Outside Diameter (OD): 4.0mm~80.0mm, Wall Thickness (WT): 0.5mm~8.0mm

Outside Diameter (OD) Standard Size: 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm,45mm, 50mm, 55mm, 60mm, 70mm, 80mm, 100mm

Length: Standard DIN EN Phosphated seamless steel tube length is 6 meters or 5.8 meters. Other hydraulic tubes length dimensions also range from 2 to 12 meters. Also can Customizable length according to customer requirements.

Surface Treatment: Galvanizing, phosphating, pickling or other processes.

Seamless Galvanized Steel Tubes: Standard zinc coating thickness is 8 to 12μm

Phosphating steel tubes: External Phosphating Coating

Sample: We can provide carbon seamless steel tubes samples for trial.

Chemical Composition of Seamless Precision Steel Pipes:

Steel Grade	Chemical Composition%
Steel Grade	C	Si	Mn	P	S
ST37.4/E235	0.07~0.13	0.17~0.37	0.35~0.65	≤0.035	≤0.035
ST35	0.07~0.13	0.17~0.37	0.35~0.65	≤0.035	≤0.035
ST45	0.17~0.23	0.17~0.37	0.35~0.65	≤0.035	≤0.035
ST52/E355	0.13~0.19	0.20~0.60	1.20~1.60	≤0.030	≤0.030

Tolerance of Seamless Galvanized Steel Pipes:

OD/mm	Tolerance/mm	ID/mm Tolerance/mm	Straightness/mm
4~30	±0.08	±0.08~±0.15	0.1/1000
30~38	±0.15	±0.15~±0.20
38~50	±0.20	±0.20~±0.25
50~80	±0.25~±0.35	±0.25~±0.35

Mechanical Property of Galvanized Seamless Steel Tubes:

Steel Grade	Yield strength	Tensile Strength	Elongation
	ReH	Rm	A
	min.	min.	min.
	MPa	MPa	%
ST37.4/E235	≥235	340 to 480	≥25
ST35	≥235	340 to 480	≥25
ST45	≥255	410 to 520	≥25
ST52/E355	≥355	490 to 630	≥22

Advantages of Precision Seamless Carbon Steel Pipes:

Galvanized steel pipe: Improves corrosion protection and extends the service life of seamless steel pipes. The galvanized layer will not be affected when the pipe is bent.
Phosphated steel pipe: Phosphated steel pipe can improve coating adhesion and facilitate painting. At the same time, it can prevent the pipe surface from rusting due to oxidation or contact with corrosive media.

Why Seamless Steel Pipes is Cold Drawn or Cold Rolled?

The main purpose of cold drawing or cold rolling is to further improve the precision, strength and surface quality of seamless precision carbon steel hydraulic tubes through plastic deformation process.

Therefore, seamless galvanized steel tubes have higher dimensional accuracy, surface quality and mechanical properties.

Solid seamless precision steel tubes can be better used in hydraulic and pneumatic systems. As well as precision machinery and engineering machinery and other fields.

Application of Seamless Hydraulic Steel Pipes

With advanced technology, seamless precision carbon steel tubes are designed to meet the stringent requirements of a wide range of industries. Superior strength, precision and durability make them a choice you can trust:

Hydraulic or pneumatic systems: Mainly used in pipelines and booms of construction machinery, agricultural machinery, and industrial equipment.
Automotive industry: As a key component in suspension systems, fuel lines and other precision engineering parts.
Industrial machinery: Provide powerful and precise solutions for fluid delivery and structural support.
Aerospace and defense: Meet stringent performance and safety standards in high-risk environments.

Machinery Boom

Hydraulic System Lines

Hydraulic or Pneumatic System

Package & Shipping of Seamless Steel Tubes

All EN1305-1, EN1305-4, DIN2391 cold drawn seamless precision steel pipes are carefully packed to provide maximum anti-collision protection to ensure their intact transportation.

The packaged seamless carbon steel precision hydraulic tubes are packed in wooden boxes or containers. It depends on the quantity of goods.

Packaging for Seamless Hydraulic Tubes

Wooden Box Package

Container Shipping

Factory of Carbon Seamless Steel Tubes

Our factory has more than fifteen years of export experience, has advanced production equipment, and has cooperated with customers in more than forty countries.