Seamless Tubing For Ship-building
Keyword:Seamless
Product Detail
Classification of ships
CCS    DNV   LR    GL    ABS    BV    RINA    NK      

GB/T5312——China National Standard

 

Field of Application
Products is designed and manufactured for boilers, superheaters and pressure systems of ships.

 

Steel Grade
320、360、410、460、490

 

Dimensions and Tolerances

Manufacturing Process           OD                   Thickness       
     Cold Drawn        Size 
  (mm)  		 Tolerance
   mm)   		Wall Thickness
     (mm)     		Tolerance
   (mm) 
＞30-50 ±0.3         ≤30       ±10% 
＞50-219 ±0.8%  

 

Mechanical Properties

Standard Steel
Grade		 Tensile Strength
(MPa)		 Yield Strength
(Mpa)		 Elongation
(%)
GB/T5312 320 320-410 ≥195 ≥25
360 360-480 ≥215 ≥24
410 410-530 ≥235 ≥22
460 460-580 ≥265 ≥21
490 490-610 ≥295 ≥21

 

Chemical Composition

                 Chemical Composition
Grade    C    Si     Mn    P    S
GB/T5312 320 ≤0.16 ≤0.35 0.40-0.70 ≤0.035 ≤0.035
360 ≤0.17 ≤0.35 0.40-0.80 ≤0.035 ≤0.035
410 ≤0.21 ≤0.35 0.40-1.20 ≤0.035 ≤0.035
460 ≤0.22 ≤0.35 0.80-1.40 ≤0.035 ≤0.030
490 ≤0.23 ≤0.35 0.80-1.50 ≤0.035 ≤0.030