Hot-rolled seamless steel tube

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:

1. 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;
2. 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.
3. 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