China [Copy] GB 3087 standard seamless boiler alloy steel pipe Low pressure Medium pressure Manufacturer and Supplier

[Copy] GB 3087 standard seamless boiler alloy steel pipe Low pressure Medium pressure

Short Description:

GB T3087-2008

low pressure Medium pressure boiler pipe super heated steam pipe high quality seamless carbon steel pipe

Mainly for India market with IBR certification

GB 3087-2008″seamless steel tube for low and medium pressure boiler” and GB5310-2008″seamless steel tube for high pressure boiler” provisions. Appearance quality: cracks,folding,rolling,scarring,separation and wrinkles are not allowde on the inner and outer surface of the steel pipe.These defects should be eliminated completely.The clearance depth shall not exceed the negative deviation of the nominal wall thickness,and the actual wall thickness at the clearance shall not be less than the minimum allowable wall thickness.

Payment: 30% deposit, 70% L/C or B/L copy or 100% L/C at sight

Min.Order Quantity: 1 PC

Supply Ability: Annual 20000 Tons Inventory of Steel Pipe

Lead Time: 7-14 days if in stock, 30-45 days to produce

Packing: Black Vanishing, bevel and cap for every single pipe; OD below 219mm need to pack in bundle, and each bundle no exceed 2 tons.

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Product Detail

Product Tags

Overview

Standard: GB/T3087-2008

Grade Group: 10#,20#

Thickness: 1 - 100 mm

Outer Diameter(Round): 10 - 1000 mm

Length: Fixed length or random length

Section Shape: Round

Place of Origin: China

Certification: ISO9001:2008

Alloy Or Not: seamless carbon steel

Application: Boiler Pipe

Surface Treatment: As customer's requirement

Technique: Hot Rolled/ cold drawn

Heat treatment: Normalizing

Special Pipe: Thick Wall Pipe

Usage: Construction, Fluid Transportation, Boiler and Heat Exchanger

Test: ET/UT

Application

It is mainly used to make high-quality carbon structural steel, low pressure medium pressure boiler pipe, super heated steam seamless carbon steel pipe

Main Grade

Grade of high-quality carbon structural steel: 10#,20#

Chemical Component

Standard	Grade	Chemical Composition(%)
		C	Si	Mn	P	S	Cr	Cu	Ni
GB3087	10	0.07～0.13	0.17～0.37	0.38～0.65	≤0.030	≤0.030	0.3～0.65	≤0.25	≤0.30
	20	0.17～0.23	0.17～0.37	0.38～0.65	≤0.030	≤0.030	0.3～0.65	≤0.25	≤0.30

Mechanical Property

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

Tolerance

Permissible deviation of outer diameter of steel tubes

Type of steel tube				Permissible deviation
Hot rolled (extruded, expanded) steel tube				± 1.0% D or ± 0.50, take the greater number
Cold drawn (rolled) steel tube				± 1.0% D or ± 0.30, take the greater number

Permissible deviation of the wall thickness of hot rolled (extrusion, expansion) steel tubes

Unit: mm

Type of steel tube	Outer diameter of steel tube	S / D	Permissible deviation
hot rolled (extruded) steel tube	≤ 102	–	± 12.5 % S or ± 0.40, take the greater number
	> 102	≤ 0.05	± 15% S or ± 0.40, take the greater number
		> 0.05 ~ 0.10	± 12.5% S or ± 0.40, take the greater number
		> 0.10	+ 12.5% S
			- 10% S
hot expand steel tube	+ 15% S

Permissible deviation of the wall thickness of cold drawn (rolled) steel tubes

Unit: mm

Type of steel tube	Wall thickness	Permissible deviation
Cold drawn (rolled) steel tube	≤ 3	15 - 10 % S or ± 0.15, take the greater number
	> 3	+ 12.5% S
		- 10% S

Test Requirement

Flattening test

Steel tubes with an outer diameter greater than 22 mm and up to 400 mm, and wall thickness greater than 10 mm should undergo the flattening test. After the samples are flattened

Bending test

Steel tubes with an outer diameter not greater than 22 mm should undergo the bending test. The bending angle is 90o . The bending radius is 6 times the outer diameter of the steel tube.After bending the sample, no fissures or cracks are permitted to appear on the sample.

Macroscopic examination

For steel tubes directly made by continuously cast billets or steel ingots, the supplying party should guarantee that there are no white spots, impurities, sub-surface air bubbles, skull patches or layering on the cross-sectional acid pickled macroscopic tissue of the billet or steel tube.

Non-destructive inspection

According to the demanding party’s request, which is then negotiated between the supplying and demanding parties and indicated in the agreement, ultrasonic flaw detection may be individually performed for steel tubes. The longitudinal manual defect of the reference sample tube should meet the requirements for post-inspection acceptance grade C8 specified in GB/T 5777-1996.