The hot-rolled seamless steel tube is
widely used for sewage disposal, well-rig, electricity generating station, air
conditioning tube, heating power tube line, threading tube, pile driving tube,
steel construction tube, coal gas, chemical industry, etc.
Advantages:
hot rolled seamless steel tube can damage the cast microstructure of the steel
ingot, refinement of the crystal grains of the steel, and eliminate the defects
of the microstructure, so that the the steel organization compacting, improve
the mechanical properties. This improvement is reflected in the rolling
direction, so that the steel is no longer to a certain extent isotropic;
pouring the formation of bubbles, cracks, and osteoporosis, under high
temperature and pressure can also be welded together.
Disadvantages:
-
After the hot
rolling, the nonmetallic inclusions in the interior of a steel (mainly
sulfides and oxides, as well as the silicate) was pressed into a sheet,
stratified (laminated) phenomenon appears. The layering of the steel in
the thickness direction by the pull performance deteriorated
significantly, and may appear in the weld shrinkage interlayer tear. Weld
shrinkage induced local strain often reach several times the yield point
strain, the strain is much greater than the load caused; -
Residual
stress caused by uneven cooling. The residual stress is the stress of
internal self-phase equilibrium in the absence of external force, the
hot-rolled steel of various cross-sectional has a residual stress such
Usually steel sectional dimension is the greater, the greater the residual
stresses. Residual stress is self-phase equilibrium, but the steel members
in the performance external force or have a certain influence. Such as
deformation, stability, anti-fatigue may adversely. -
Hot-rolled
steel products, poor control of thickness and edge width. We are familiar
with the thermal expansion and contraction, even if the beginning of the
hot-rolled out are standard length, thickness, or there will be some
negative final after cooling, this negative differential edge width wider
the increasing thickness of the performance of the more obvious. So for
large steel for steel edge width, thickness, length, angle, and sideline
no law requires too precise.
Usage:
Applicable to the general structure, mechanical structure, Low, medium and high
pressure boiler,
transportation for gas, water, oil and natural gas, tubes for heat exchanger
and chemical fertilizer
equipments, for hydraul hydraulic pillar service etc..
Standard:
1.Carbon steel pipe: ASTM A106,A53, ASTM A179, ASTM
A192,DIN17175 ST45.8 ST35.8
2.Alloy steel pipe: ASTM A335,ASTM A213
3.Stainless steel pipe: ASTM A312,ASTM A213
4.Line
pipe and cashing pipe: API5L,API 5CT
Out Diameter:
1/8 – 30 inch (10.3-762mm)
Wall Thickness:
0.049”–2.5”(1.24-63.5mm)
Length:
Random Length, Fixed Length, SRL, DRL
Steel Grade:
API5L: GR B, X42, X46, X56, X60,
X65, X70
ASTM A53/A106: GR A, GR B, GR C
ASME SA106: GR.A, GR.B, GR.C
ASME SA192: SA192
ASME SA209M: T1, T1a
ASME SA210: GR.A-1, GR.C
ASME SA213: T2, T5, T9, T11, T12, T22
ASME SA335: P2, P5, P9, P11, P12, P22, P91
DIN17175:ST35.8, ST45.8, 15Mo3, 13CrMo44
Heat treatment:
Annealed: Bright annealed,Spheroidize annealed, Normalized, Stress relieved,
Cold finished, Quenched and Tempered
Delivery Condition:
BKS, NBK, BK, BKW, GBK(+A), NBK(+N), BK(+C)
Dimension Tolerance:
Steel Pipe Specification |
Steel Pipe Outside Diameter(D) |
Steel Pipe Wall Thickness(S) |
||
Pipe Body
|
Steel Pipe Outside Diameter (mm) |
Allowable deviation (mm) |
Steel Pipe Outside Diameter (mm) |
Allowable Deviation (mm) |
≥60.3 and S<20 |
±0.75% |
≤73.0 |
+15%,-12.5% |
|
≥60.3 and S≥20 |
±1.00% |
>73.0 and S<20 |
+15%,-12.5% |
|
|
|
>73.0 and S≥20 |
+17.5%,-10 |