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DIN2391 ST35 Seamless Steel Pipe

Cold drawn seamless steel pipe is made from a seamless steel hollow. It is further processed by cold drawing over a mandrel, to control the ID, and through dies to control the OD. CDS is superior in surface quality, dimensional tolerances and strength when compared to hot finished seamless tubing.Due to the characteristics of high-precision, in precision machinery manufacturing, auto parts, hydraulic cylinders, construction (steel sleeve) industry has a very wide range of applications. Size: 16mm-89mm. W.T.: 0.8mm-18 mm. Shape: Round. Production type: Cold drawn or cold rolled. Length: Single random length/ Double random length or as customer’s actual request max length is 10m

Chemical Composition(%)

Standard	Grade	Chemical Components (%)
		C (Max)	Si(Max)	Mn	P	S	Mo	Cr	V
DIN2391	ST35	0.17	0.35	≥0.40	≤0.025	≤0.025	0.25-0.35	/	/

Mechanical Properties

Standard

Grade

Mechanical Properties（NBK)

Tensile Strength (Mpa)

Yield Strength (Mpa)

Elonga-tion (%)

DIN2391

ST35

340-470

≥235

≥25

Annealing After the goods are cold drawn to sizes, the tubes are put on annealing furnace for heat treatment and normalising. Straightening Post annealing, the goods are passed through a seven roller straightening machine to achieve proper straightening of the tubes. Eddy current Post straightening, each tube is passed through eddy current machine to detect for surface cracks and other defects . Only the tubes that pass eddy current are fit for delivery to customers. Finishing Each tube is either oiled with corrosion resistant oil or varnished for surface protection and corrosion resistant as per customers requirement, each tube end is covered by plastic end caps to avoid damage in transit, the marking and specs are put and the goods are ready for dispatch.

Cold Drawn Seamless Steel Pipe Delivery Condition

Designation	Symbol	Description
Cold drawn/hard	+C	No heat treatment after the final cold drawing process
Cold drawn/soft	+LC	After the final heat treatment there is a suitable drawing pass
Cold drawn and stress relieved	+SR	After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere
Annealed	+A	After the final cold drawing process the tubes are annealed in a controlled atmosphere
Normalized	+N	After the final cold drawing operation the tubes are normalized in a controlled atmosphere

Application

Cold Drawn Carbon steel seamless pipes are extensively applied in the nuclear device, gas conveyance, petrochemical, shipbuilding and boiler industries, with characteristics of high corrosion resistance combined with suitable mechanical properties. - Nuclear device - Gas conveyance

DIN2391 ST35 Seamless Steel Pipe

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