20 Years of Experience in Seamless Steel Tube Production

Cold Drawn Seamless Steel Tube - Suppliers Cold Drawn Seamless Steel Tube - Suppliers

Quality carbon steel, cold drawing, bright heat treatment without oxidization (NBK status), nondestructive testing, in the wall honing and inside smooth.

  • Gray with white
  • Carbon steel
  • Alloy steel
  • OD:4-89 MM
  • WT:0.5-7 MM
  • Length:6000mm or customized
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  • Model: Round tube
  • Brand: SDY
  • Code: 01
  • Product Description
  • Production Process Advantages


Cold Drawn Seamless Steel Tube ( Polished )

Selection Standard: DIN2391( Germany Standard ) or EN10305-1/4( Europe Standard )

Synopsis of Process Routing: Quality carbon steel -- cold drawn -- heat treatment without oxidization ( NBK status ) --nondestructive testing -- flushing the internal hole with special equipment under the high pressure -- dealing with antirust oil on surface -- plastic capping on both ends.

Main Features: High precision, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high cleanness of inside wall. The steel tube is able to withstand high pressure. No deformation after cold bending, no crack after flaring and flattening. The complicated geometrical forming and machining can be realized. Color of tube: gray with white.

Main Application: To be used in hydraulic system automobile and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.

Our Certificate:

At the present time,SHENGDINGYUAN is equipment with the leading products line in China,and boasts of its quality guaranteen system and international quality in a complete set.Our corporation's products have been certified by ISO9000-2000 standard,the international quality management system,in 2006 and 2007 separetely.Meanwhile,we have nanaged production quality in an all-round way,in alignment waih ISO/TS16949:2002 standard.Our corporation has a professional team engaging in research,development design,as well as a standard laboratory ang testing center.Thanks to it,our production technologies have been continually optimized and improved,product quality steadily increased and market incessantly extended.Our quality policy:Guest comes first and systematic management,high quality and efficiency,eternal improvement.


1.Round Bar Cutting Equipment and Process 

Operation workers according to the production process card requirements set the length of the material debugging equipment, and then roll round steel to the automatic material transfer belt to cut off, according to the requirements of the process card cut enough quantity after the steel cable hoisting to the next process-hot piercing.


2.Hot Piercing Equipment and Process

The operation staff hoist the cut off round steel to the automatic feeding place of the hot piercing equipment, and automatically feed the material into the heating furnace through the roller and conveyor belt according to the set value. After heating to a certain temperature, the round steel enters the perforation machining channel through the transmission belt, and then moves to the punch machine through the conveyor belt after perforation, punching one end and returns to the material rack for natural cooling and hoisting.


3.Cold Drawn Equipment and Process

According to the requirements of the production process card, The operation staff drawing the semi-finished product and checked by the technician to see if it meets the requirements of the process card. After once or twice cold drawing, the semi-finished product needs intermediate annealing - surface treatment (pickling - phosphating - saponification)- rolling head (pressing head is convenient for cold drawing after clamping die cold drawing)- medium cutting (cutting according to process card requirements and then cold drawing again).

Cold drawing is a processing technology of materials. For metal materials, cold drawing refers to drawing in order to achieve a certain shape and certain mechanical properties, while the material is at room temperature. Cold-drawn products have the advantages of high dimensional accuracy and good surface finish compared with thermoforming.



4.Cold Drawn Procss's Oxygen Annealing Equipment and Process

The operation staff carries on the intermediate annealing heat treatment to the semi-finished product in the drawing process according to the production process card requirements, and carries on the surface treatment (pickling, phosphating, saponification) process after the natural cooling.


5.Surface Treatment (pickling, phosphating, saponification)

After intermediate annealing (oxygen annealing) heat treatment, the semi-finished product is transferred to the surface treatment workshop for pickling-phosphating- saponification.

6.Bright Annealing Furnace and Process

The operator arranges the process card requirements and operation specifications for the semi-finished products which are cold drawn to the outer diameter of the finished product specifications. After the wire is bundled in batches, one end is blocked with asbestos, and placed on the transmission belt at the set speed into the furnace for heating and heat preservation for a period of time.


7.Semi-finished Products Processing Workshop

Semi-finhsed prodecuts processing workshop director according to production plan sheet requirements and process card instructions to arrange each pass straightening (through array up and down stick roller press, ensure steel pipe straightness)- gauge cutting head and tail (according to customer required length cut finished product)- Eddy current inspection (monitoring surface defects, defects will automatically alarm identification)- Manual inspection (according to production process card requirements for steel pipe wall thickness (wall thickness micrometer), outer diameter and inner diameter (Vernier caliper, clip gauge), straightness (put on marble inspection table plug ruler), inside and outside surface (in light photo condition check steel pipe inside and outside surface defects or bruises)- Packaging (according to production plan sheet) and process card requirements).



8.Product Warehouse


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