Seamless Precision Steel Tubes

Description

Seamless Precision Steel Tubes according to EN ******1 Standard: DIN***1 part 2 , DIN EN******1, DIN****5 etc;
Material: ST*5,ST*5,ST*2.
Manufacturing method: cold-rolled / cold-drawn
Delivery condition: BK,BKS,SR,GBK,NBK.
 
Certificate
Factory Certification: 2.2 according to EN
Acceptance Test Certificate:3.1 according to EN ****4
 
Packing:
in bundles tied with steel strips. External packing by wooden cases if the wall thickness/OD ratio is low.
Oil-coating is generally necessary especially for export.
 
Application: 
Used in hydraulic & pneumatic cylinder ,automobile and other mechanical device .Feature: high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid, mechanical properties of the final tubes also come out excellent, promising no leakage under high pressure, no deformation after cold-bent and no cracks when flaring and flattening, ensuring the efficient operation in all service.
NBK means protective heat-treating under the non-oxidation enviroment to get a bright and smooth surface for the tubes. 

DIN ******1 Part 2 Seamless Precision steel tubes(DIN******1)
Standard DIN ***1 defines the technical delivery conditions for seamless precision steel tubes according to DIN ***1 Part 1 which are made from the steel grades listed in section 5.
Tubes according to this Standard are mainly used where accuracy to dimension and, possibly, small wall thicknesses and good surface condition are required. Note:

• The yield point for the annealed (GBK)condition on delivery is at least *0% of the (ultimate) tensile strength. Depending upon the degree of deformation in the drawing operation, the yield point of tubes delivered in the cold-finished/hard (BK)and cold-finished/soft(BKW) conditions, may be increased to a level close to the tensile strength.
• In calculating the yield point, the following values are recommended : cold-finished/hard condition on delivery ≥ *0% of the tensile strength, cold-finished/soft condition on delivery ≥ *0% of the tensile strength.