Seamless steel pipe

Seamless steel pipes are produced using an extrusion mold. Welded steel pipes are produced by rolling a sheet of steel into a tube and welding the seam. Seamless steel pipes are less expensive. The third method is casting. Molten steel is poured into a casting mold.

Please check more in-formations about seamless pipes and tubes as below:

Seamless Steel pipes by application

Steel pipe are ubiquitous and can be found underground and within residential walls, laboratories, and commercial and industrial structures. Seamless steel pipe transport fluids including water, natural gas, waste and air. Three manufacturing methods exist to produce steel pipes.

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ASTM Seamless pipes

The ASTM/ASME seamless steel pipes are extensively applied in petroleum, chemical, power, boiler, and machinery industries. Our prefect products and preferential price have won us customers' trust and consistently favorable comments.

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DIN Seamless steel pipe

DIN/EN seamless pipes are extensively applied in petroleum, chemical, power, boiler, and machinery industries. Our prefect products and preferential price have won us customers’ trust and consistently favorable comments.

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JIS Seamless pipes

JIS seamless pipe is steel pipe that has been created by JIS and meets certain performance requirements. Manufacturers follow Japan Industrial Standards voluntarily.

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Leading Big O.D. Steel seamless pipes supplier in Asia

Big OD seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Big OD seamless pipes dominates 65% of market share in Chinese boiler industry.

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API pipes & tubes

The American Petroleum Institute has several standard specifications for pipe. They set forth dimensions, materials, quality control during manufacture, minimum physical properties such as yield strength, etc.

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How to packing the seamless pipe

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

We can makes and markets cold-drawn and hot rolled seamless steel pipes and cold-drawn special-section seamless pipes which are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction, chain, electric of the company is 80000t.

Inspection and Test:
Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.

Surface treatment:
Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting

JIS G3462 boiler tubes

JIS G3462 boiler tubes

boiler tube, boiler tubes, heat exchanger tubes, JIS G3462, JIS G3462 STB A12, JIS G3462 STB A13, JIS G3462 STB A24, Seamless pipe, Seamless Pipes, seamless steel tubes, Seamless tube, seamless tubes, steel tube

JIS G3462  is a JIS standard refers to alloy steel boiler tubes and heat exchanger tubes. This steel tubes is used in carbon steel pipes for tube heat-exchange inside and outside, such as boiler water steel pipe, superheater tube, condenser tube and more.
However, it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

The size range of  JIS G3462 boiler tubes(mm):

• Outer Dimensions: 19.05mm-168.3mm
• Wall Thickness:2.0mm-14 mm
• Length: max 19000mm

Application of JIS G346s seamless tubes:

• used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc. of boilers, and heat exchanger industries.
• it is not applicable to the steel tubes for heating furnace and those for heat exchangers for low temperature service.

The main products of steel / steel grade:

• JIS G3462 STB A12
• JIS G3462 STB A13
• JIS G3462 STB A24

Corresponding to international standards

• ISO 9329-2:1997 Seamless steel tubes for pressure purposes-Technical delivery conditions-Part 2: Unalloyed and alloyed steels with specified elevated temperature properties.
• ISO 9330-2:1997 Welded steel tubes for pressure purposes-Technical delivery conditions-Part 2: Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated temperature properties.

Delivery Condition:

• Heat treatment,Annealed, Normalized, Normalized and Tempered

Surface treatment:

• Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
• Painting as requested.

Chemical composition of JIS G3462 heat exchanger tubes(%):

Grade	C	Si	Mn	P	S	Cr	Mo
JIS G3462 STB A12	0.10~0.20	0.10~0.50	0.30~0.80	<0 td>	<0 td>	—	0.45~0.65
JIS G3462 STB A13	0.15~0.25	0.10~0.50	0.30~0.80	<0 td>	<0 td>	—	0.45~0.65
JIS G3462 STB A24	<0 td>	<0 td>	0.30~0.60	<0 td>	<0 td>	1.90~2.60	0.87~1.10

Mechanical behavior of JIS G3462 heat exchanger tubes (%):

Grade	tensile strength kgf/mm²{N/mm²}	yield strength kgf/mm²{N/mm²}
JIS G3462 STB A12	<39{382}	<21{206}
JIS G3462 STB A13	<42{412}	<21{206}
JIS G3462 STB A24	<42{412}	<21{206}

Tolerance on Outside Diameter in JIS G3462

O.D.	TOLERANCE ON OUTSIDE DIAMETER
	HOT ROLLED SEAMLESS PIPES	SEAMLESS PIPES THROUGH QUENCH AND NORMALIZED	COLD DRAWN SEAMLESS PIPES THRONG, THE HOT TREATMENT EXCEPT QUENCH AND NORMALIZED	ELECTRIC WELDED PIPES EXCEPT COLD DRAWN	COLD DRAWN ELECTRIC WELDED PIPES
MM
< td>	+0.4 -0.8	±0.25	±0.10	±0.15	±0.10
<25.40		±0.25	±0.15	±0.20	±0.15
<40-50		±0.25	±0.20	±0.25	±0.20
<50.60		±0.25	±0.25	±0.30	±0.25
<60-80		±0.30	±0.30	±0.40	±0.30
<80.100		±0.40	±0.40	-0.60,+0.40	±0.40
<100-120	+0.4 -1.2	-0.60,+0.40	-0.60,+0.40	-0.80,+0.40	-0.60,+0.40
<120-160		-0.80,+0.40	-0.80,+0.40	-1.00,+0.40	-0.80,+0.40
<160-200	-1.8,+0.4	-1.20,+0.40	-1.20,+0.40	-1.20,+0.40	-1.20,+0.40
<200	-2.4,+0.4	-1.60,+0.40	-1.60,+0.40	-1.60,+0.40	-1.60,+0.40

Tolerance on Wall Thickness in JIS G3462

WALL THICKNESS (MM)	HOT ROLLED SEAMLESS PIPE		COLD DRAWN SEAMLESS PIPE		ELECTRIC WELDED PIPE
	O.D（MM）		O.D（MM）		O.D（MM）
	< td>	<100	< td>	<40	< td>	<40
	(%)
< td>	-	-	-0,+0.4mm	+22 -0	-0,+0.3mm	+18 0
<2-2.4	-0,+40	-	+20 -,0		+18 -0
<2.4-3.8	-0,+35	-0,+35
<3.8-4.6	-0,+23	-0,+33
<4.6	-0,+28	-0,+28

Tolerance on the Length in JIS G3462

ITEM		TOLERANCE AN LENGTH
OD<50mm td>	<7m td>	-0, +7mm
	<=7m	Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD<=50mm	<7m td>	-0, +10mm
	<=7m	Every 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD: Outside Diameter

JIS G3456 Seamless tubes for high pressure service

JIS G3456 Carbon steel pipes, Seamless pipes for high temperature service at a temperature over 350 Degrees celsius.

carbon steel pipe, carbon steel pipes, JIS G3456, JIS G3456 STPT370, JIS G3456 STPT410, JIS G3456 STPT480, Seamless pipe, Seamless Pipes, Steel pipe

Standard:

JIS G 3456:2010

JIS, Japanese Industrial Standards specifies the standards used for industrial activities in Japan.

Size range of JIS G3456(mm):

• Outer Dimensions: 19.05mm- 114.3mm
• Wall Thickness:2.0mm -14 mm
• Length: max 16000mm

Application:

• Carbon steel pipes for pressure service
• High pressure service and high temperature service at  a temperature over 350 Degrees celsius

Packing:

• Be packed in Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
• Surface: Varnish coating
• Ends: Beveled or Plain ends with Plastic caps
• Painting: as requested.

Inspection & Certification:

1) Certification: ISO, API, ASTM, DIN etc.
2) Mill Test Certificate: EN10204/3.1B
3) Third party inspection: SGS, BV, Lloyds etc.

The main products of steel / steel grade:

• JIS G3456 STPT370
• JIS G3456 STPT410
• JIS G3456 STPT480

Chemical Compositions(%) of JIS G3456

Standard/ Grade	C	Si	Mn	P	S
JIS G3456 STPT370	≤0.25	0.10-0.35	0.30-0.90	≤0.035	≤0.035
JIS G3456 STPT410	≤0.30	0.10-0.35	0.30-1.00	≤0.035	≤0.035
JIS G3456 STPT480	≤0.33	0.10-0.35	0.30-1.00	≤0.035	≤0.035

Mechanical Properties of JIS G3456

Standard/ Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)
JIS G3456 STPT370	≥216	≥370	≥30
JIS G3456 STPT410	≥245	≥410	≥25
JIS G3456 STPT480	≥275	≥480	≥25

Tolerance on Outside Diameter and Wall Thickness in JIS G3456

APPLICATION	TOLERANCE ON OUTSIDE DIAMETER		TOLERANCE ON WALL THICKNESS
Hot Rolled Seamless Pipes	< mmspan>	±0.5mm	< mmspan>	±0.5mm
	<50-160mm	±1%
	<160-200mm	±1.6mm	<4mm	±12.5%
	<200mm	±0.8%
	More that 350mm, the Tolerance is ±0.5%
Cold Drawn Seamless Pipes and Electric Resistant Welded Pipes	< mmspan>	±0.3mm	< mmspan>	±0.2mm
	<40mm	±0.8%	<2mm	±10%
	More than 350 mm the Tolerance is ±0.5%

Oil Country Tubular Goods

Oil Country Tubular Goods (OCTG)

Oil country tubular goods (OCTG) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application. (see Figure 1 for schematic of a deep well):

• Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid. Pipe segments 30 ft (9m) long are coupled with tool joints. Drill pipe is simultaneously subjected to high torque by drilling, axial tension by its dead weight, and internal pressure by purging of drilling fluid. Additionally, alternating bending loads due to non-vertical or deflected drilling may be superimposed on these basic loading patterns.
• Casing pipe lines the borehole. It is subject to axial tension by its dead weight, internal pressure by fluid purging, and external pressure by surrounding rock formations. Casing is particularly exposed to axial tension and internal pressure by the pumped oil or gas emulsion.
• Tubing is pipe through which the oil or gas is transported from the wellbore. Tubing segments are generally around 30 ft [9 m] long with a threaded connection on each end.

Typical OCTG manufacturing processes include (all dimensional ranges are approximate)

• Tubing Pipe - Seamless Steel Tubing manufactured to API 5CT Specification Latest Edition, EUE Threaded and Coupled
• Casing Pipe - Seamless Steel Casing manufactured to API 5CT Specification Latest Edition, Plain End
• Carbon and Alloy Line Pipe, Welded (60” O.D. and greater), Seamless (up to 24” O.D.), High-pressure and Low-temperature; (ASTM A106, API grades X70 and higher)
• API Pipe Couplings

ASTM A53 Pipe,ASME SA53 Pipe

ASTM A53 Pipe,ASME SA53 Pipe

ASTM A53 Pipe,ASME SA53 Pipe

ASTM A53, carbon steel pipe, Seamless pipe, seamless steel pipe, Steel pipe 

ASTM A53

carbon steel pipe

Seamless pipe

seamless steel pipe

Steel pipe

ASTM A53 Standard specification covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding.

The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth, electric furnace, or basic-oxygen. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.

A53 pipe comes in three types and two grades

• A53 Type F, which is longitudinally furnace butt welded or continuous welded (Grade A only)
• A53 Type E, which is longitudinally electric resistance welded (Grades A and B)
• A53 Type S, which is seamless pipe, produced by hot working, and possibly cold finishing, the steel (Grades A and B). ASTM A53, Type S is now currently an outdated specification and has been replaced by ASTM A106 specification for seamless carbon steel pipe.

This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services.

This specification covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. Continuous-Welded pipe is not intended for flanging. Purpose for which pipe is intended should be stated on order. It shall be permissible to furnish pipe having other dimensions provided that such pipe complies with all other requirements of this specification. Supplementary requirements of an optional nature are provided and shall apply only when specified by the purchaser.

Note 1. The dimensionless designators NPS (nominal pipe size) [DN (diameter nominal)] have been substituted in this specification for such traditional terms as ‘nominal diameter,’ ‘size,’ and ‘nominal size.’

Note 2. The term nominal wall thickness has been assigned for the purpose of convenient designation, existing in name only, and is used to distinguish it from the actual wall thickness, which may vary over or under the nominal wall thickness.

Permissible Variations in Wall Thickness

The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

Permissible Variations in Weights per Foot

Weight of any length shall not vary more than 10% over and 3.5% under that specified.

NOTE-NPS 4 and smaller-weighed in lots. Larger sizes shall be weighed separately by length.

Chemical Requirements ASTM A53

Chemical elements	Type S		Type E		Type F
	(SMLS)		(ERW)		(FW)
	Gr. A	Gr.B	Gr. A	Gr. B	Gr. A
Carbon max. %	0.25	0.3	0.25	0.3	0.3
Manganese %	0.95	1.2	0.95	1.2	1.2
P, max. %	0.05	0.05	0.05	0.05	0.05
Sulfur, max. %	0.045	0.045	0.045	0.045	0.045
Copper, max.%	0.4	0.4	0.4	0.4	0.4
Nickel, max. %	0.4	0.4	0.4	0.4	0.4
Chromium, max. %	0.4	0.4	0.4	0.4	0.4
Mo, max. %	0.15	0.15	0.15	0.15	0.15
Vanadium, max. %	0.08	0.08	0.08	0.08	0.08

The total composition for these five elements shall not exceed 1.00%.

Tensile Requirements

Properties	SMLS & ERW		Con. welded
	Grade A	Grade B	Grade
Tensile Strength, min., psi	48,000	60,000	45,000
Yield Strength, min., psi	30,000	35,000	25,000

• Seamless and Electric-Resistance-Welded — Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of a size.
• Continuous-Weld — Bending, flattening, tensile
• Con. welded: Continuous-welded

General Information

Couplings — Applied handling tight. Couplings, 2″ and smaller straight tapped, other sizes taper tapped.

Thread Protection — Applied to pipe 4″ and larger.

End Finish (unless otherwise specified) –

STD or XS, or wall thicknesses less than 0.500 in. (excluding XXS): Plain and beveled

All XXS and wall thicknesses over 0.500 in.: Plain end square cut.

Hydrostatic testing

Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric-resistance-weld pipe.

Mechanical tests specified

• Tensile Test — Transverse required on ERW for NPS 8 and large.
• Sending Test (Cold) — STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.

Application	Degree of Bend	Diameter of Mandrel
For Normal A53 Uses	90	12 x nom dia. of pipe
For Close Coiling	180	8 x nom dia. of pipe

Flattening Test — NPS 2 and larger STD and XS. (Not required for XXS pipe.)