API 5CT OCTG Tubing & Casing – OCTG Pipe Manufacturer China
Every OCTG tubing and casing order that leaves our plant is made to API 5CT and traced from heat number to final thread. You are not buying a description of a pipe — you are buying the file behind it: mill certificates, dimensional reports, chemical and mechanical test data, and thread inspection records travel with every shipment. For a drilling engineer, that paperwork is what keeps a well program on schedule. Alongside casing and tubing, we supply couplings, thread protectors and cross-over accessories, so one order covers the whole string rather than a single item.
We manufacture and stock the sizes and grades that cover most well programs without waiting for a special mill run:
Casing: 4-1/2" to 20", grades J55 / K55 / N80 / L80 / P110
Tubing: 2-3/8" to 4-1/2", grades J55 / N80 / L80 / P110
Connections: STC, LTC, BTC; premium connections on request
Lengths: R1 / R2 / R3
Finish: mill varnish, plastic thread protectors, beveled ends as specified
Send your well depth and casing program. We will recommend weights, grades and connections based on the downhole conditions, not just quote whatever happens to be in stock. If you are not sure whether N80 or L80 fits your service class, our technical staff will walk you through the selection with the API 5CT tables in front of you.
Send Royal Steel Group your pipe list or well program, and we will come back with grades, weights, connections and a firm price — no ballpark figures. Email:admin@royalsteelgroup.com or WhatsApp:+86 136 5209 1506. Expect a reply within one working day, with lead time and loading schedule included. Third-party inspection (SGS, BV or the agency you nominate) can be arranged before shipment at no extra hassle.
Production runs in our OCTG casing pipe factory on automated lines, and every stage is checked rather than assumed: online ultrasonic and electromagnetic testing after forming, drift testing on each pipe, and a final thread inspection before the coupling is torqued. As an OCTG tubing manufacturer with our own heat treatment line, we control the properties that actually matter — yield strength, toughness and thread geometry — instead of passing along a trading certificate. Each joint is stenciled with heat number, grade, size and weight before it is bundled, so the paperwork matches the physical pipe, not the other way around.
The OCTG tubing for oil and gas projects we ship covers surface casing, intermediate and production casing, production tubing, workover and repair strings, geothermal wells and water injection wells. Onshore or offshore, shallow or deep, the same rule applies: the grade and connection must match the downhole conditions, not the catalogue page. We have supplied strings for standard vertical wells, directional drilling and high-pressure zones, and we can prepare the full joint-count summary your completion engineer needs for approval.
Sourcing directly from Royal Steel Group eliminates the intermediaries typically found between the manufacturing plant and the drilling site. You receive original documentation issued directly by the factory rather than certificates re-issued by third parties, and you have the option to inspect the production line in person before placing a formal order. You can start with a trial order of a single truckload to verify the pipe quality firsthand, scaling up your procurement only after the product's performance has been proven. Since both casing and tubing are shipped from the same factory under a single purchase order, you ensure a high level of consistency in steel grades and connection types across all batches—a critical factor when running a pipe string spanning thousands of meters, rather than just installing a single joint of pipe.
Steel products are packaged according to international export standards to ensure safety, stability, and surface protection during long-distance transportation.
All materials are securely bundled with high-strength steel straps and reinforced to prevent deformation during handling and shipping. Protective end caps and waterproof wrapping are applied to prevent moisture, corrosion, and mechanical damage.
Standard export packaging includes seaworthy steel frames or wooden pallets, suitable for both container loading and bulk vessel shipment. Each bundle is clearly labeled with specification, grade, heat number, and size for full traceability.
We provide flexible logistics solutions based on project requirements, ensuring safe loading, efficient transport, and timely delivery to global destinations, especially across the Americas.
Q1. Are you a manufacturer or a trading company?
We are a manufacturer with our own production lines — casing, tubing and couplings come from one plant under a single P.O. This is why we can issue mill certificates that trace back to the actual heat, and why you are welcome to audit the line before you commit.
Q2. What grades and sizes do you supply?
Casing from 4-1/2" to 20" in J55, K55, N80, L80 and P110; tubing from 2-3/8" to 4-1/2" in J55, N80, L80 and P110. If you need a grade or size outside this range, send your requirement and we will check mill availability before quoting — we do not confirm what we cannot deliver.
Q3. Do you provide mill certificates and third-party inspection?
Yes. Mill certificates (MTC) travel with every shipment, covering chemical composition, mechanical properties and heat numbers. Third-party inspection by SGS, BV or the agency you nominate can be arranged before loading.
Q4. What are your payment terms?
Standard terms are T/T (30% deposit, balance against shipping documents) or L/C at sight for larger orders. Terms are confirmed per order and can vary with order value and your company's purchasing history.
Q5. What is the minimum order quantity?
We can start with a one-truckload trial order so you can inspect the joints before scaling up. For full casing programs we quote per tonne or per joint, with a complete joint-count summary your completion engineer can approve.
Q6. What is your lead time?
Stock sizes ship within 15-25 days of deposit confirmation; mill production depends on grade, size and quantity. Every quote includes a firm lead time and loading schedule, and we update you the moment anything shifts.
Q7. Can you supply premium connections or special service grades?
Standard connections are STC, LTC and BTC. Premium connections and special grades for sour service or high-pressure wells are available on request — send your connection spec or well data and we will confirm what we can supply.
Q8. What shipping terms do you offer?
FOB, CFR and CIF from major Chinese ports, or DDP to your warehouse for regular repeat orders. Export packing is included — threaded ends protected, joints bundled, and each bundle marked with heat and grade.
ROYAL STEEL GROUP
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
