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Cold Drawn Steel Tube And Pipe

  • Introduction:Hebei Haihao Group is a leader manufacturer in China,we can manufacture cold drawn seamless steel pipe,casing pipe,LSAW steel pipe

Cold Drawn Steel Tube And Pipe

Product details

Cold-drawn steel pipe generally takes several times pulling in between each drawing a corresponding stress relieving, to ensure the smooth progress of the next cold drawn.

From the appearance of cold-rolled seamless steel tubes tend to be small in diameter, hot-rolled seamless steel tubes are often large diameter. 

Cold drawn steel pipe manufacturing process:

cold drawn steel pipe manufacturing process

Heat treatment of cold drawn seamless steel pipe: cold drawn steel annealing: refers to the metal material is heated to the appropriate temperature, to maintain a certain time, and then slowly cooled heat treatment process. Common annealing process are: recrystallization annealing, stress relieving, ball annealing, fully annealed and so on. The purpose of annealing: mainly to reduce the hardness of the metal material, to improve the plasticity, or cutting processing to Liqie pressure processing, reduce the residual stress and improve the uniformity of microstructure and composition, heat treatment, after possible or tissue preparation. Cold Drawn Seamless tubing (also known as CDS).

 Production Stainless Steel Seamless Pipe/Tube
 Technique Seamless (Cold Drawn/Cold Rolling)
 Standard  GB/T 14975-2002,GB/T 14976-2002,GB 13296-2007,GB 9948-2006,GB 5310-95
 ASTM A312, ASTM A213, ASTM A269 and ASTM A511, ASTM A789 and ASTM A790
 JIS 3463 and JIS 3459
 DIN 2462, DIN 17458 and DIN 17456
 GOST 9941
 Out Diameter 1/8"~32"  (6mm~830mm)
 Wall Thickness SCH10S,SCH40S,SCH80S,SCH160S  (1mm~60mm)
 Material TP304,TP304L,TP304H,TP316,TP316L,TP316Ti,TP309,TP310S,TP314,
TP317L,TP321,TP347H,904L,S31803,S32205,S32750 etc.
 Length 1-12m or as customers required
 Surface treatment polishing,annealing,bright annealing and acid pickling

The principal reasons behind cold drawing are: Precision cold drawn seamless steel tube Achievement of closer wall thickness and diameter tolerance Improvement in surface finish To enhance serviceability No premature failure Suitable for critical forming Such as 180 deg Bends Enhancement of mechanical properties of the tube Expansion of product mix towards the lower end of the OD and wall thickness scales.

cold drawn stainelss steel seamless pipe chemical composition

THERE ARE THREE BASIC PROCESSES EMPLOYED FOR THE COLD DRAWING OF TUBE: Hollow drawing Stationery drawing or floating plug drawing and Drawing over a mandrel (also known as drawing on-the-bar) 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.


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