GB3087 Low Pressure Boiler Seamless Steel Pipe

Short Description:

GB 3087 20# seamless steel tubes is widely used for manufacturing heating-pipeliners, containers, steaming pipeliners of low-medium pressure boilers.

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Product Detail

Product Tags

Product Introduction

Manufacture: Seamless process ,Hot-finished or Cold-finished.
Wall thickness(WT): 3.2 mm——21 mm.
Outer diameter (OD): 33 mm——323 mm.
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded.

Additional Info

Port of Shipment: Tianjin, China.
Payment Terms:T / T, LC.
Delivery: 7-15 days after payment.
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No.
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required.

Manufacturing Methods

(1)Method of manufacturing steel
Steel are manufactured by electric furnace, oxygen converter or open hearth method.

(2)Manufacturing method of tube blank
The tube blank can be produced by a hot rolling method, and a continuous casting billet or a steel ingot can also be used.

(3)Manufacturing method of steel pipe
The steel pipe can be manufactured by a hot rolling (extrusion, expansion) or cold drawing (rolling) seamless method.

Product Display

Chemical Composition(%)

Standard	Steel Grade	C	Si	Mn	S	P	Cr
GB 3087	10	0.07-0.13	0.17-0.37	0.35-0.65	0.02	0.025	≤0.15
GB 3087	20	0.17-0.23	0.17-0.37	0.35-0.65	0.02	0.025	≤0.25

Mechanical Properties

Standard	Steel pipe	Wall thickness	Tensile strength	Yield Strength	Elongation
		(mm)	(MPa)	(MPa)	%
				≥
GB3087	10	/	335-475	195	24
	20	＜15	410-550	245	20
	20	≥15	410-550	225	20

Allowable Deviation Of Outer Diameter And Wall Thickness

Type of steel pipe	Outer diameter(mm)		Tolerance
Type of steel pipe	Outer diameter(mm)		ordinary	advanced
Hot rolled tube	OD	≤159	±10%（min±0.50mm）	±0.75%(min±0.40mm)
	OD	＞159	±1.0%	±0.90%
	WT	≤20	＋15.0%(min＋0.45mm) －12.5% －0.35mm)	±10%（min±0.30mm)
		＞20	±12.5%	±10%
		OD≥351	±15%
Cold drawn tube	OD	10～30	±0.40mm	±0.20mm
		＞30～50	±0.45mm	±0.25mm
		＞50	±1.0%	±0.75%
	WT	1.5～3.0	+15% -10%	±10%
	WT	＞3.0	+12.5% -10%	±10%

Testings

(1)Hydraulic test
The steel pipe should be hydraulically tested one by one.

(2)Flattening test
Steel pipes with an outer diameter of more than 22mm to 400mm and a wall thickness of not more than 10mm shall be subjected to a flattening test.

(3)Flaring test
The steel pipe with a wall thickness of not more than 8 mm can be subjected to a flare test with a top taper of 30°, 45° or 60°.

(4) Bending test
Steel pipes with an outer diameter of not more than 22 mm will be subjected to a bending test.

(5)Non-destructive testing
According to the requirements of the purchaser, the steel pipe will be ultrasonically tested one by one.

Surface Quality

The inner and outer surfaces of the steel pipe do not have cracks, folds, creases, crusting or separation, and these defects should be completely removed. The clearance depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning site shall not be less than the minimum allowed by the wall.