The company has established the "Dong Fang Yunlong E-commerce Trading Platform" with oil drilling and production equipment and tools as the radiation point, improved the ability of Internet cross-border e-commerce, and completed the transformation of enterprise from internal operation to building industry alliance. It has built an intelligent workshop, expanded the support of intelligent manufacturing for enterprise operation, created a new intelligent manufacturing mode with high efficiency and flexibility, and improved the core competitiveness of the enterprise. And successfully registered production and sales companies in the Netherlands, opening a new starting point for overseas investment and development.
In the future, Dongfanglong will closely focus on national policy orientation and innovation driven development strategy, formulate sustainable development transformation strategy, keep forging ahead, take creating world famous brand and winning honor for the nation as the goal, work together with people of insight from all walks of life for win-win cooperation, and build up the dream of oil equipment manufacturing.


API 5ct oil well casing and tubing pipe
1.The plant is one of the biggest tubing manufacturers in China . Tubing and its coupling made and checked in the plant are in full accordance with API Spec 5CT .In the mean time.the product was also authorized to use API Spec 5CT monogran in 1999(Certificate No.5CT-0484) .
2.The kinds of the tubing made in the plant are as follows:23/8in,27/8in and 31/2in NU and EU tubing of J55 ,N80 and P110 steel gread.After upsetting,the tubing endures fulllength heat treatments.The heat treatment procedure is controlled by computers.3.Tubing production capactity is 60,000 ton per year and the upsetting and heat treatment capacity is 15,000 ton per year .
4.With a perfect management system for tubing quality, the plant got ISO 9001 quality system certficate from API IN 1999.
4.Tubing and its coupling is one of main products to be coivered with the quality system.The product is stable and reliable in quality,characteristic data are in accordance with the requirement of API Spec 5CT Specification for Casing and Tubing and API Std.5B Specification for Machining,Measurement and Inspection of Casing,Tubing and Line Pipe.It is reliable in performance,long in life and can meet the requirments of oil production operation.
Name | API 5CT steel pipe |
Outer Diameter | 2''~32" |
Wall Thickness | SCH10,SCH20,SCH30,STD,SCH40,SCH60,XS,SCH80, SCH100,SCH120, SCH140,SCH160,XXS,DIN, JIS standard thickness |
Length | 4m~12m or depending on customers' requirements |
Standard | API 5CT,GB/T 19830,SY/T6194 |
Grade | J55,K55,N80,L80(13Cr),P110 etc |
Application | Low and middle pressure fluid pipeline, boiler, petroleum And natural gas industry, drilling, chemical |
Surface | Black painting, varnish, transparent oil, hot galvanized, 3PE,epoxy coating,BE,PE.etc. |
Package | As per customers' request |
Certificate | API 5ct ISO |
Price term | EXW FOB CIF |
Payment | L/C. T/T. |
Advantages | 1.Reasonable price with excellent quality 2.Abundant stock and prompt delivery 3.Rich supply and export experience, sincere service 4.Reliable forwarder, 2-hour away from port. |
Grade | Type | Total elongation under load (%) | Yield strength (min)Mpa | Yield strength (max)Mpa | Tensile strength min Mpa | Hardness Max (HRC) | Hardness Max (HBW) |
J55 | - | 0.5 | 379 | 552 | 517 | - | - |
K55 | - | 0.5 | 379 | 552 | 655 | - | - |
N80 | 1 | 0.5 | 552 | 758 | 689 | - | - |
N80 | Q | 0.5 | 552 | 758 | 689 | - | - |
L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 |
L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 |
L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 |
C90 | - | 0.5 | 621 | 724 | 689 | 25.4 | 255 |
C95 | - | 0.5 | 655 | 758 | 724 | - | - |
T95 | - | 0.5 | 655 | 758 | 724 | 25.4 | 255 |
P110 | - | 0.6 | 758 | 965 | 862 | - | - |
Q125 | All | 0.65 | 862 | 1034 | 931 | - | - |




Q: Are you a manufacturer?
galvanized steel pipes,Seamless steel tube and square tube,We promise that we are what you are looking for.
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.So we can give the best offer.
Q: How do you make our business long-term and good relationship ?
A: 1.We keep good quality and competitive price to ensure our customers' benefit.
2.We respect every customer as our friend and we sincerrly do business and make friends with them, no matter where they come from.