Seamless Carbon Steel Tube

Gnee Steel (Tianjin) Co., Ltd
 

Gnee Steel Group is a comprehensive supply chain enterprise integrating the design and processing of steel pipes and pipe fittings. The company was founded in 2008 with a registered capital of RMB 5 million. After years of hard work, Gnay people have made remarkable progress and development in the steel market.

 

Team Style
The company has a reasonable talent structure. The factory has a group of professional technicians as the main technical management personnel. We have master's and bachelor's degrees, accounting for more than 90 percent of the staff, and many people have been certified as technical engineers sales professionals, and technicians.

 

Packaging And Shipping
GNEE Group can flexibly adjust the production plan and shipment plan to meet the needs of different customers' delivery cycles, GNEE Group can also provide customers with tube management services, material planning to reduce logistics costs for customers, and even meet the needs of zero inventory management for highly demanding customers, creating value for customers, reducing customer risk to a lower level, and saving costs.

 

Sales Market
Our customers are all over the world, from more than 160 countries and regions such as India, Vietnam, Thailand, Korea, Canada, Australia, Chile, USA, Mexico, Senegal, Brazil, Singapore, Mauritius, UAE and so on. Every year, 65% of our customers buy back our products.

 

GNEE Certification
Since its establishment, GNEE Group has been taking advantage of quality, producing strictly according to the ISO 9001 quality management system, exporting high-quality steel pipes to customers all over the world. Its products have obtained certificates from authoritative TPI organizations, such as API 5L, SGS, BV, TUV, ABS, LR, GL, DNV, CCS accreditation, RINA, RS and so on.

 

 

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Product

Seamless Carbon Steel Tube

Seamless Pipe

China

GB/T8162/T8163 GB5310/6579/9948

U.S.A.

ASTM A53/A106/A178/A179/A192/A210/A213/A333/A335/A283/A135/A214/315/A500/A501/A519/A161/A334; API 5L/5CT

Japan

JIS G3452/G3454/G3456/G3457/G3458/G3460/3461/3462/3464

German

DIN 1626/17175/1629-4/2448/2391/17200 SEW680

Russia

GOST 8732/8731/3183

Material and Grade

China

10#, 20#, 16Mn, 20G, 15MoG, 15CrMo, 30CrMo,42Crmo, 27SiMn, 20CrMo

U.S.A.

Gr. B/Gr.A/A179/A192/A-1/T11/T12/T22/P1/FP1/T5/4140/4130

Japan

STPG38,STB30,STS38,STB33,STB42,STS49,STBA23,STPA25,STPA23

German

ST33,ST37,ST35,ST35.8,ST45,ST52,15Mo3,13CrMo44, 1.0309, 1.0305, 1.0405

Russia

10, 20, 35, 45, 20X

Out Diameter

10-1000mm

Wall Thickness

1-80mm

Length

1-12m

Protection

Plastic caps

Packing terms

Labeled and bundled together with steel strip

Shipment terms

Containers or bundles by sea, one 20" container can load about 20 tons(5.8meters long), one 40" container can load about
23-25tons(less than 11.8meters long)

Quality Certificate

ISO, API, Mill Test Certificate

Surface Treatment

Black painting/varnished surface,anti-corrosion oil, galvanized or as per required by customer

 

Specification

Specification

Specification

Specification

Φ4×0.5

Φ16×0.5

Φ26×1.8

Φ35×9.0

Φ4×0.8

Φ16×0.8

Φ26×2.0

Φ35×10

Φ4×1.0

Φ16×1.0

Φ26×2.2

Φ38×0.5

Φ4×1.2

Φ16×1.2

Φ26×2.5

Φ38×0.8

Φ5×0.5

Φ16×1.5

Φ26×2.8

Φ38×1.0

Φ5×0.8

Φ16×1.8

Φ26×3.0

Φ38×1.2

Φ48×5.0

Φ70×2.8

Φ90×10

Φ130×14

Φ48×5.5

Φ70×3.0

Φ90×12

Φ130×16

Φ48×6.0

Φ70×3.5

Φ90×14

Φ130×18

Φ48×7.0

Φ70×4.0

Φ90×16

Φ140×2.5

Φ48×8.0

Φ70×4.5

Φ95×2.0

Φ140×2.8

Φ48×9.0

Φ70×5.0

Φ95×2.2

Φ140×3.0

 

Production Process

 

The main production process of hot-rolled seamless steel pipes (main inspection process):
Tube blank preparation and inspection → tube blank heating → piercing → tube rolling → steel reheating → fixed (reduced) diameter → heat treatment → finished pipe straightening → finishing → inspection  (non-destructive, physical and chemical inspection) → warehousing.


The main production process of cold-rolled (drawn) seamless steel pipes:
Billet preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspections.

 

 
 
Applications of Seamless Steel Tube

Seamless steel tubing finds extensive use across various industries due to its mechanical properties and adaptability. Here are some common applications:

A335 P22 Hot Finished Seamless Pipe

Hydraulic Systems

Both CDS and HFS tubing are widely used in hydraulic cylinders, pumps, and other components due to their ability to withstand high pressures.

ASTM A335 P1 P22 Alloy Steel Pipes

Structural Applications

They provide essential support in construction projects, machinery frameworks, and heavy equipment.

A213 T21 T22 T23 Alloy Steel Pipe For Boiler

Automotive Industry

Seamless tubes are integral in manufacturing parts such as axles, suspension components, and frames.

A335 P22 Chrome Moly Seamless Pipe

Oil & Gas Industry

HFS tubing is particularly valuable in drilling operations and transportation of fluids.

 

General seamless carbon steel pipe

It is made by hot rolling or cold rolling of high-quality carbon steel such as 10, 20, 30, 35, 45, 16mn, 5mnv and other low alloy structural steel or 40cr, 30crmnsi, 45mn2, 40mnb and other alloy steel. 10, 20 and other low carbon steel seamless pipes are mainly used for fluid conveying pipelines. Seamless tubes made of medium carbon steel such as 45 and 40cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Generally, seamless steel pipes are used to ensure strength and flattening tests. Hot-rolled steel pipes are delivered in a hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in a heat-treated state.

 

Quality Assurance in Seamless Carbon Steel Tube

ISO 9001 and CE certified process ensures consistent quality from raw material to final inspection.

 

Utilizes Non-destructive testing (ultrasonic,X-ray,magnetic particle,eddy current ), with hydrostatic testing up to 50 MPa.

Regular inspections are conducted on the steel pipes, with a qualification rate of 99%.

18+ years of industry experience ensures precise manufacturing and high-quality control.

Trusted in oil, gas, petrochemical, power, and construction industries, with a strong global reputation.

 

 
Our Certification
 
productcate-500-598
productcate-500-598
productcate-500-598

 

FAQ

 

Q: Can we visit your factory?

A: Warmly welcome once we have your schedule we will pick you up.

Q: Can you arrange the shipment?

A: Sure, we have permanent freight forwarder who can gain the best price from most ship company and offer professional service.

Q: How long is your delivery time?

A: Generally it is 10-35 days .it is according to quantity.

Q: How can we get the offer?

A: Please offer the specification of the product,such as material,size,shape,etc.

Q: How to control and guarantee your shipment quality?

A: All our factories are ISO9001, CEcertified facility; Ex factory inspection by our own laboratory.

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional seamless carbon steel tube manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale discount seamless carbon steel tube for sale here and get free sample from our factory. Good service and low price are available.

fluid transportation pipe, A106 GRB Steel Pipe, Seamless Carbon Steel Tube

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