Multi-rifled seamless steel tube

Multi-rifled seamless steel tube is used as a water wall tube loaded with a highly heated flux and is also expected to find broadened other uses in the viewpoint of iits energy saving effect and higher safety against the overheating damage. This has groove on its inside surface which functions to raise thermal efficiency by distrubing the fluid within the tube, featuring and extremely high thermal conduction property.

Multi-rifled seamless steel tube
Available grades and size range:

Multi-rifled seamless steel tube are produced to meet specific end use requirements, specifications, tolerances and chemistries.

Standard Grade Specification
O.D.(mm) W.T.(mm) Number of rib
GB/T 20409-2006 20G
15CrMoG
SA-210A1
SA-210C
SA-213 T2
SA-213 T12
22-83 4.5-13    4-14  

 

Grade and Chemical Composition (%)
Steel Grade C Si Mn S P Cr Mo
20G 0.17-0.23 0.17-0.37 0.35-0.65 0.015 0.025    
15CrMoG 0.12-0.18 0.17-0.37 0.40-0.70 0.015 0.025 0.80-1.10 0.40-0.55
A 210A1
SA-210A1
≤0.27 ≥0.10 ≤0.93 0.020 0.025    
A 210C
SA-210C
≤0.35 ≥0.10 0.29-1.06 0.020 0.025    
A 213 T2
SA-213 T2
0.10-0.20 0.10-0.30 0.30-0.61 0.020 0.025 0.50-1.81 0.44-0.65
A 213 T12
SA-213 T12
≤0.15 ≤0.50 0.30-0.61 0.020 0.025 0.80-1.25 0.44-0.65

 

Typical Mechanical Properties

Inside the water wall pipes of boilers in sub-critical steam power plants, water boils into steam vapor.

-
Grade Condition Tensile strength Yield stength Elongation
Mpa(min) Mpa(min) %(min)
1020 CW 414 483 5
SR 345 448 10
A 193 331 30
N 234 379 22
1025 CW 448 517 5
SR 379 483 8
A 207 365 25
N 248 379 22
4130 SR 586 724 10
A 379 517 30
N 414 621 20
4140 SR 689 855 10
A 414 552 25
N 621 855 20
Technical Specifications:

Rifled tube

The rifled tube is used as a water wall tube loaded with a highly heated flux and is also expected to find broadened other uses in the viewpoint of its energy-saving effect and higher safety against overheating damage.

The rifled tube has a groove on its inside surface that functions to raise thermal efficiency by disturbing the fluid within the tube, featuring an extremely high thermal conduction property.


Rifled tube
Rifled tube (Internally ribbed tube)
 


Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.