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Carbon Steel Dsaw Pipe

Difference between ERW and DSAW pipes ERW pipes means Electric Resistance Welded Pipes. Electric resistance welding at a glance *ASTM A53 Standard Specifications *ASTM A252 standard specification *The Purpose Guidance Of Welded Steel Pipe *Why welding stee tubes *Kind for welding pipe *ERW pipe...
Product Details:

PRODUCT NAME

PROMOTIONAL PRICE ssaw/sprial steel pipessaw/SAW/DSAW/ SSAW HSAWsprial carbon steel pipe

STANDARD

ASTM, GB, API, JIS, BS, DIN, YB, SNY, etc

MATERIAL

10#,20#,45#,A53A,A53B,A106Gr.A,A106Gr.B,A106A,A106B,ST52,ST358,16Mn,
Q235, Q195, Q345, Q215, API 5L Gr.B,Gr.65,Gr.60,Gr.70,
X42,X52,X60,X65,X70,X80,etc

SPECIFICATION

Outer diameter: 219mm-3620mm
Wall thickness: 2.5mm-30mm
Length: 6m-12m or as requested

SEAM

SAW(Spiral welded),SSAW(Spiral submerged-arc welded),HSAW,(Helical Submerged Arc
Welded), ERW, JCOE, LSAW, UOE

SURFACE

Black painted, PE/PVC/PP coated, Galvanized, color coated, anti rust varnished,
anti rust oiled, checkered, epoxy coating, etc.

END

plain end, spigot & socket joint, beveled, cut square, flanged, piling shoes

END PROTECTOR

1) Plastic pipe cap
2) Iron protector

PACKAGE

Standard export package, suit for all kinds of transport or as required.

PRICE TERM

EXW, FOB, CFR, CIF, etc.

PAYMENT TERM

T/T, L/C at sight, etc.

APPLICATION

1) General service for industries ( petroleum, chemical, aviation, etc.)
2) Fluid, gas and oil transport,
3) Press and heat transmission,
4) City construction, etc.


Difference between ERW and DSAW pipes

image001

ERW pipes means Electric Resistance Welded Pipes.


Electric resistance welding at a glance

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*ASTM A53 Standard Specifications

*ASTM A252 standard specification

*The Purpose Guidance Of Welded Steel Pipe

*Why welding stee tubes

*Kind for welding pipe

*ERW pipe weld contour shape


Difference between ERW and DSAW pipes is generated in the carbon steel smelting defect  smelting and casting process, such as segregation, non-metallic inclusions, porosity, shrinkage and cracks.

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Double Submerged Arc Welded (DSAW) steel pipe

Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. Both inside and outside welds are performed.


Segregation

Segregation is the uneven distribution of chemical composition in the steel, in particular harmful elements such as sulfur, phosphorus enrichment in the ingot.


Non-metallic inclusions

Non-metallic inclusions refers to non-metallic inclusions in steel containing impurities such as sulfides and oxides.


Stomata

Stomata refers iron and carbon monoxide gas effect generated in the pouring can not fully escape and stay in the tiny pores in the ingot.


Shrinkage

Shrinkage is due to the liquid steel ingot mold from outside to inside, the volume contraction during solidification bottom-up, because the level drops, the final solidification of liquid steel parts can not be added to form.


Crack

Solidification of liquid steel in the order due to different causes stress, tension cracks may appear larger parts.


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