Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
Standard of DNV Det Norske Veritas(DNV)
Standard of Lloyd'S Register of UK(LR) Lloyd'S Register of UK(LR)
Standard of Germanischer Lloyd Germanischer Lloyd(GL)
Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
Standard of RINA Italian classification society(RINA)
Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)

GB/T5312 Chinese national standard

Appication:
Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and II

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Model N0.of major steel tubes
320, 360, 410, 460, 490, etc.

Note:
residual elements:Cr≤0.25%,  Mo≤0.10%,  Ni≤0.30%, Cu≤0.30%, aggregate≤0.70%

 

 

Certificate

Factory Certification: 2.2 according to EN

Acceptance Test Certificate:3.1 according to EN 10204

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.