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EN Standard SSAW Steel Pipe

Difference between SSAW steel pipe and LSAW steel pipe Difference between LSAW steel pipe and SSAW steel pipe are followings below: + LSAW pipe Metallurgical properties of raw materials Straight seam submerged arc welding tube is made of steel, but spiral submerged arc welding steel pipe...
Product Details:
Products Name

Carbon Steel ASTM A53 Gr.B SSAW Steel Pipe DIN30672 BS534 , Spiral Welded Steel Tube

Classfication

Standard

Main Products

Steel Pipe for Fluid Service

GB/T 14291

Welded pipe for mine fluid sevice

GB/T 3091

Welded pipe for low pressure fluid service

SY/T 5037

Spirally submerged arc welded steel pipe for pipelines for low pressure fluid service

ASTM A53

Black and hot-hipped galvanized welded and seamless steel pipe

BS EN10217-2

Welded steel tybes for pressure purposes - delivery technical conditions - part2: Electric welded non- alloy and alloy steel tubes with specified elevated temperature properties

BS EN10217-5

Welded steel tybes for pressure purposes - delivery technical conditions - part5: submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties

Steel Pipe for Ordinary Structure

GB/T 13793

Longitudinally electric resistance welded steel pipe

SY/T 5040

Spirally submerged arc welded steel pipe piles

ASTM A252

Welded and seamless steel pipe piles

BS EN10219-1

Cold formed welded structural hollow sections of non-alloy and fine grain steels - part1: Technical delivert conditions

BS EN10219-2

Cold formed welded structural hollow sections of non-alloy and fine grain steels - part2: tolerances dimmsions and sectional properties

Line Pipe

GB/T 9711.1

Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class A steel pipe)

GB/T 9711.2

Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class B steel pipe)

API 5L PSL1/2

Line pipe

Casing

API 5CT/ ISO 11960 PSL1

Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries


Difference between SSAW steel pipe and  LSAW steel pipe

Difference  between LSAW steel pipe and SSAW steel pipe are followings below:

image001 

 + LSAW pipe


Metallurgical  properties of raw materials

Straight seam submerged arc welding tube is made of steel, but spiral submerged  arc welding steel pipe production is usd hot rolled steel coil strip. The hot  strip rolling process with a series of advantages, has a metallurgical process  for production of high-quality line pipe capacity.

LSAW  (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw  material, the steel plate in the mold or molding machine pressure (volume) into  using double-sided submerged arc welding and flaring from production.

*Equipment of Longitudinally Submerged  Arc Welded and UOE

*The purpose  of cold expansion for lsaw steel pipe

*Longitudinally Submerged Arc Welded  Process Flow

*The developing  trend of LSAW steel pipe

*LSAW  Production Size Range

*Difference between ERW, SSAW, LSAW

*Advantages of  LSAW steel pipe

*The LSAW  steel pipe producing equipments

*The technique  process of LSAW steel pipe

*LSAW steel  pipe industry usage

*Pipe info  chat for LSAW steel pipe


image002

 + SSAW pipes


Spiral  submerged arc welding(SSAW) is its forward direction and forming tube centerline  hose reel molding angle (adjustable), side molding edge welding and weld them  into a spiral.

*Spiral Submerged-arc Welded Quality Assurance

*Ultrasonic Test System for SSAW Pipe Weld Seam

*Submerged arc  welding pipe, SAW pipes

*ASTM A252 SSAW pipes, SMAW welding

*ASTM A252-89  Weldedd and seamless pipe piles

*Spiral  Submerged-arc Welded steel pipe Success Stories

*Internal and  External Anti-corrosion steel pipe Standard

*Spiral  submerged arc welding


Welding  process

From the  welding process, spiral steel pipe welding method is the same as lsaw steel  pipe, but the straight seam submerged arc welding tube inevitably will be a lot  of T-weld, so the probability of presence of welding defects also greatly  improved, and T-welds welding residual stress weld metal are often in a three  dimensional stress state, increasing the possibility of cracks.

According to  the submerged arc welding process requirements, each weld should have the arc  at the extinction,but each steel pipe is unable to meet the conditions in  welding girth,which may be at the extinction more welding defects.


1. The  welding process is concerned: a consistent spiral welded pipe and Longitudinal  welding, straight seam steel pipe will inevitably have a lot of T-weld, and  therefore the probability of the existence of welding defects has greatly improved, and welding residual T welds stress is large, the weld metal are often in three-dimensional stress state, increases the likelihood of cracks.  Furthermore, according to the provisions of submerged arc process, each weld  shall have the arc at the place and extinction, but in each Longitudinal seam  welding ring, unable to meet the conditions, which may have a place in the extinction more weld defects.


2. When the  pressure in the pipe to withstand, typically produces two main stress on the  wall, that the radial and axial stress stress δ. Weld resultant stress δ, wherein the helix angle of the weld.


3. Spiral  Weld Pipe degree helix angle is generally, therefore synthetic spiral weld  stresses are the principal stresses. Under the same operating pressure, spiral  pipe of the same diameter than the Longitudinal wall thickness can be reduced.


4. The  hydrostatic burst strength: by the relevant comparison test, to verify the  yield pressure and burst pressure measured and theoretical values spiral pipe and Longitudinal basic agreement, deviation close. But neither the yield stress  or burst pressure, spiral pipe were lower than Longitudinal. Blasting test also  shows spiral steel hoop blasting mouth deformation rate significantly greater  than the Longitudinal. It was thus confirmed, spiral pipe plastic deformation  than Longitudinal, blasting the mouth is generally confined to within a pitch,  which is spiral weld for expansion gap played a powerful role in binding due.


5. Toughness  and fatigue strength: pipeline development trend of large diameter, high  strength. With the increase of the diameter of the pipe, the steel grade increase, resulting in greater the ductile fracture tip steady expansion trend.  Spiral pipe and Longitudinal although the same as a level, but the spiral steel  pipe has a high impact toughness.


6. Because of  the transfer line output volume changes: in actual operation, the pipe is  subjected to random alternating loads of action. Learn low cycle fatigue strength of steel, judging life of the pipeline is of great significance.


7. Press the  measuring result: fatigue strength spiral steel seamless and ERW pipe with the  same test data and seamless pipe distribution and resistance in the same area, while Longitudinal submerged arc than the average higher.


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