Technical parameters spiral steel pipe

Technical parameters rotating steel pipe 

 

Longitudinal production process is simple, high efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than the Longitudinal, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight seam pipe, the weld length increased by 30 to 100%, and lower production rate. Therefore, the smaller diameter pipe mostly straight seam welded large diameter pipe most of the basic parameters of spiral welded, spiral steel pipe: 

Size tolerance: 

Pipe wall thickness of steel pipe type of OD (D) (S) 

Cold drawn tubes and steel pipes OD (mm) tolerances (mm) wall thickness (mm) tolerances (mm) 

> 30 ~ 50 ± 0.3 ≤ 30 ± 10% 

> 50 ~ 219 ± 0.8% 

Hot-rolled tubes> 219 ± 1.0%> 20 ± 10% 

Mechanical properties: 

The standard grades of tensile strength (MPa) Yield strength (MPa) Elongation (%) Impact Energy (J) Brinell hardness (HB) delivery status 

GB9948 10 330 ~ 490 ≥ 205 ≥ 24 / / normalizing 

20 410 ~ 550 ≥ 245 ≥ 21 ≥ 39 / normalizing 

The 15CrMo 440 ~~ 640 ≥ 235 ≥ 21 ≥ 47 ≤ 170 normalized and tempered 

1Cr2Mo ≥ 390 ≥ 175 ≥ 22 ≥ 92 ≤ 179 normalizing plus tempering 

1Cr5Mo ≥ 390 ≥ 195 ≥ 22 ≥ 92 ≤ 187 annealing 

Chemical composition: 

Standard Chemical Composition (%) 

C Si Mn P S Cr Mo Ni 

GB9948 10 0.07 ~ 0.14 0.17 ~ 0.37 0.35 ~ 0.65 ≤ 0.035 ≤ 0.035 ≤ 0.15 / ≤ 0.25 

20 0.17 ~ 0.24 0.17 ~ 0.37 0.35 ~ 0.65 ≤ 0.035 ≤ 0.035 ≤ 0.25 / ≤ 0.25 

15CrMo 0.12 ~ 0.18 0.17 ~ 0.37 0.40 ~ 0.70 ≤ 0.035 ≤ 0.035 0.80 ~ 1.10 0.40 ~ 0.55 ≤ 0.30 

1Cr2Mo ≤ 0.15 0.50 ~ 1.00 0.30 ~ 0.60 ≤ 0.035 ≤ 0.030 2.15 ~ 2.85 0.45 ~ 0.65 / 

1Cr5Mo ≤ 0.15 ≤ 0.50 ≤ 0.60 ≤ 0.035 ≤ 0.030 4.00 ~ 6.00 0.45 ~ 0.60 ≤ 0.60