Home page

API Casing

Application：Oil well casing serves as well sidewall Pipe Standard：API SPEC 5CT Size：OD: 114.3-508mm,WT: 5.21-16.13mm Process Type: Seamless (SMLS), Electric Resistance Welded (ERW) Grade: J55, K55, N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr,C95, P110. Thread types:STC, LTC, BTC etc

Classification :

Oil country tubular goods

WhatsApp : +8615688862221

E-mail : QSsteel@tsingshanh.com

PRODUCT DETAILS

Description

Casing is used for lining the complete borehole which has been dug into the ground to procure oil. Similar to the drill pipe, the oil well casing pipe is also subjected to axial tension, therefore they are required to be made from high-quality strong steel material. OCTG casing is large diameter pipe which are held in place in the borehole using cement.

The diameters of OCTG casing pipe range from 4.5″ to 36″. The well-cemented pipe acts as the structural component of the well and offer hole integrity. They prevent the well from collapsing when the drilling process is on. Good quality, well cemented casing can stay in place for the whole life of the well.

The oil well casing pipe are further divided into:

Conductor Casing – Conductor casing is the first boundary between the surface and the subsurface. It helps prevention of well collapse; it keeps away the groundwater and most importantly provides structural support. Conductor casing is installed in the ground by either drilling it or hammering it down. They are available in sizes ranging from 18″ to 36″.

Surface Casing – The purpose of Surface casing is primarily environmental and to ensure safety. It helps in separating the freshwater zones, offering protection from blowout and supporting the wellhead and blow out prevention equipment. Therefore surface casings are required to maintain very high safety standards. They are responsible for supporting the next casing in line. They may vary in size depending on their purpose, but the most common size of surface casing is 13 3/8”.

Intermediate Casing: Intermediate casing is not always required in all types of oil and gas production. If used, they are placed between the surface and the production casing. They are available in sizes ranging from 13 3/8” to 16”.

Production Casing – Production casing help provide structural integrity and pressure control of the hydrocarbon-bearing sections mainly during the production of oil.

Production Liner – Production liners can be suspended from the production casing or one of the previous casings. They help in reducing the cost significantly as the liner is not required to run through the full depth of the well. Liners can be pre-perforated to help save time and cost.

More casing pipes and their colors

Specification

API 5CT Well Casing Length:

API 5CT Casing	Range 1	Range 2	Range 3
API 5CT Casing	4.88~7.62	7.62~10.36	10.36~14.63

Dimension

Labels		OD(mm)	WT(mm)	J55/K55	N80	L80	C90/T95	P110	Q125
4 1/2	9.5	114.3	5.21	PS	-	-	-	-	-
4 1/2	10.5	114.3	5.69	PSB	-

Packing and shipping

Our company has passed ISO9001 quality management system certification, Our Mill product with CE/EN10204 / ASTM/Classification society certificate/CASO/BIS etc certificate.All the customers give good appreciation to our products.We are glad to be your good partner.

Application Areas

Steel is widely used in steel structure workshops, bridge frames, main structures of high-rise buildings, and infrastructure construction (such as highways, oil and gas pipelines). Its high strength properties ensure load-bearing stability and seismic performance. In ship manufacturing, steel is used to build hull structures, decks, and internal components. Hot-rolled coils rely on their load-bearing capacity to adapt to harsh environments. ‌

CUSTOMER FEEDBACK

Exporting our products to more than 100 countries and regions worldwide.All the customers give good appreciation to our products.We are glad to be your good partner. Warmly welcome you to visit our factory!

FACTORY WORKSHOP

Factory workshop

APPLICATION FIELD

Construction Project

Marine Exploration

Automobile Manufacturing

Architectural Engineering

Aerospace

Solar Energy

FAQ

Q: Do you support custo

A: Yes. We provide one-stop deep processing services, including slitting, flattening, cutting, bending, welding, polishing, drilling, hot-dip galvanizing and color coating. Custom sizes, special thicknesses and surface treatments are all acceptable.

Q: Can you provide third-party inspection reports?

A: Yes. We support SGS, BV, TUV and other third-party inspections. Each batch is equipped with official factory MTC mill test certificate, chemical composition and mechanical property reports.

Q: How to choose the right steel grade for my project?

A: Carbon steel is suitable for general structure and fluid transportation; galvanized/color coated steel for anti-rust building enclosure; stainless steel for corrosion-resistant, sanitary and marine environments. Our professional sales team can recommend the most cost-effective solution according to your usage scenario, temperature, corrosion environment and load requirements.

Q: What standards do your steel products comply with?

A: All products support international mainstream standards, including GB, ASTM, AISI, JIS, DIN, EN. Common grades such as Q235B, Q355B, 20#, 45#, 304, 316L, 430 are fully available and can meet global engineering and procurement standards.

Q: What steel products do you supply?

A: We provide a full range of steel materials, including carbon steel, stainless steel, galvanized steel, color coated steel, steel plates, steel coils, steel pipes and customized steel profiles. Products are widely used in construction, machinery, petrochemical, shipbuilding, automobile and engineering fields.

RELATED PRODUCTS

ST42 Carbon steel pipe

The tensile strength of ST42 Carbon Steel Pipe shall not be less than 42kgf/mm2, which is 420MPa.ST42 Carbon Steel Pipe is a German standard seamless steel pipe, which is widely used. German standard seamless steel pipes for general purposes are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for fluid transportation .

A36 Carbon Steel Plate

A36 is an American standard carbon structural plate, which is subject to ASTM A36/A36M. This standard is applicable to riveting, bolting and welding structures for bridges and buildings, as well as general purpose structural steel quality carbon steel sections, plates and bars.

Structural Steel Pipe

Structural Steel Pipe. A wide range of applications rely on structural steel pipe for strength and stability. Tsingshan Steel supply welded and seamless pipe for structural applications to customers in all industries. As a leading steel pipe supplier, Tsingshan Steel offers a large inventory of pipe and tubing sizes from 1/8” NPS to 48” NPS.

ST37 Carbon Steel Coil

St 37 steel is a low-carbon structural steel commonly used for manufacturing various structural components and mechanical parts. Its most common equivalent grades are the U.S. standard AISI 1008/1010 or the European standard S235JR.

X42 Carbon Steel Pipe

API 5L X42 line pipe and API 5L X52 line pipe (Seamless and welded pipe) of all grades have PSL1 and PSL2 two product specifications, they are different on chemical composition, manufacturing processes, mechanical strength, heat treatment, test records, traceability etc. Actually, X42 and X52 etc. denote the minimum yield strength of the pipe steel. X42 has the minimum yield strength of 42 kilopound/square inch and X52 has the 52 ksi.

316L Stainless Steel Round Bar

Stainless steel is one of the most versatile materials in the manufacturing world, and its popularity continues to grow with time. A commonly used variation of steel is a 316L stainless steel round bar, used in various industrial applications. This type of steel is known for its excellent corrosion resistance, high ductility, and high-temperature strength.

PPGI DC01

Prepainted galvanized steel coil is a kind of colour coated steel coil (PPGI coil). It uses galvanized steel as the base metal. The zinc layer offers strong corrosion resistance. Plus with painting, it is more durable than galvanized steel.The metallic coated steel then experiences some cleaning procedures, pre-treatment solutions and ultimately gets multiple layers of organic coatings, including laminates, vinyl dispersions, and paint. This continuous technique of applying different coatings is referred to as coil coating. Therefore, the steel coil doesnt require painting or finishing when employed in finished products.

316L Stainless Steel Plate

Alloys 316 (UNS S31600) and 316L (UNS S31603) are molybdenum-bearing austenitic stainless steels, which are more resistant to general corrosion and pitting/crevice corrosion than the conventional chromium-nickel austenitic stainless steels such as Alloy 304. These alloys also offer higher creep, stress-to-rupture, and tensile strength at elevated temperatures. In addition to excellent corrosion resistance and strength properties, the Alloys 316 and 316L Cr-Ni-Mo alloys also provide excellent fabricability and formability which are typical of the austenitic stainless steels.

Stainless Steel Channel

Stainless steel channel is a corrosion-resistant structural profile with a C-shaped cross-section. It combines the high strength and easy framing capabilities of the channel design with the durability, hygiene, and aesthetic appeal of stainless steel, making it the ideal choice for applications where longevity, cleanability, and resistance to harsh environments are paramount. Classification: Channel Steel

DC01 Galvanized Sheet

DC01 Galvanized Round Steel refers to round bars produced from DC01 steel (a cold-rolled mild steel grade per EN 10130, known for good formability) that have been hot-dip galvanized for corrosion protection. It is commonly used for components requiring good formability and surface protection, such as in general hardware, light structural applications, and various fabricated parts.

S355 Carbon Steel Plate

S355 is a European-standard, high-strength low-alloy (HSLA) structural steel, characterized by its medium tensile strength, excellent weldability, and guaranteed impact resistance at sub-zero temperatures. Governed by the EN 10025 series of standards, it offers a superior strength-to-weight ratio compared to standard carbon steels like S235 and S275, making it a premier choice for critical welded and bolited structures in demanding environments.

A283 Carbon Steel Plate

ASTM A283 is a standard specification for low and intermediate tensile strength carbon steel plates of structural quality for general application. It covers four grades (A, B, C, D) with incrementally higher minimum yield and tensile strength requirements. Q195 is a comparable Chinese standard (GB/T 700) grade, often supplied as an equivalent.

ST12 Cold Rolled Steel Sheet

ST12 is German standard (DIN1623), It's ordinary cold rolled steel. In principle, ST12 can only be bent and formed, and no stamping is allowed.

AH36 Carbon Steel Plate

AH36 is a high-strength shipbuilding steel plate, one of the most common grades used in marine and offshore structural applications. It is strong, tough, and offers good weldability and formability to meet the demands of ship construction. As a grade that requires classification society certification (e.g., ABS, LR, DNV), it is important to know its key attributes, which include a minimum yield strength of 355 MPa (51 ksi) and guaranteed impact toughness at low temperatures.

NM500 Carbon Steel Plate

NM500 is a high-strength, wear-resistant / abrasion resistant steel plate specified in the Chinese national standard GB/T 24186. NM500 is known for its superior hardness and durability. This steel is specifically designed to withstand severe abrasive wear conditions to provide extended service life in challenging industrial environments.

SPCE Cold Rolled Steel Coil

SPCE steels can be drawn to a greater depth and more flexibly as compare to SPCD steels. SPCE steels are deep drawing quality cold rolled steels, which are consumed for drawing applications.This material is valid for drawing operation where the depth of the drawn part exceeds its diameter. The appropriate thickness for this SPCE material as demarcated in the JIS G3141 starts from 0.25 mm to 2.5 mm. However the width of SPCE material ranges to 2000 mm.

S275JR Carbon Steel Plate

S275JR is a non-alloy structural steel plate according to European standard EN 10025-2. It offers good strength, excellent weldability and formability, making it a versatile and commonly used material for general structural applications. Typical uses include: manufacturing plants, machinery frames, construction, various equipment, and other structural components.

Q195 Cold Rolled Steel Coil

Q195 Cold Rolled Steel is a Chinese plain carbon structural steel, yield strength: 195 MPa, tensile strength: 315-430 MPa, material density: 7.85 g/cm3. “Q” is the first letter of Chinese spelling of “qu fu dian”, the translation is “Yield Point” or “Yield Strength”, “195” is indicates the unit value “195 MPa”.

1020 Carbon Steel Coil

1020 carbon steel is a commonly used plain carbon steel. It has a good combination of strength and ductility and can be hardened or carburized.1020 carbon steel which contains 0.12 to 2% carbon. This steel category gains hardness and strength with heat treatment when the percentage of carbon content increases but the ductility is reduced.

SS400 Carbon Steel Coil

SS400 according to material grade and name defined in the JIS G 3101 standard, The first S stands for "Steel", the second S stands for "Structure", and 400 for the lower limit tensile strength of 400 MPa. Ordinary structural steel with a tensile strength of 400 Mpa.This steel is the most widely used in JIS standard. Its use covers structures such as bridges, ships, vehicles, etc., in the shape of steel plates, steel bars and sections, almost all auxiliary materials for machinery and structures are used.

S235JR Carbon steel coil

S235JR is a European standard non alloy structural steel, which is equivalent to the national standard Q235B, that is, carbon structural steel with low carbon content. It is widely used for welding, bolting and riveting structures. It can also be used for building, bridge, ship, vehicle structural parts, manufacturing various tools, cutting tools, molds and measuring tools.

4130 Carbon steel pipe

The better weldability also makes 4130 Carbon Steel Pipe a popular choice in the aerospace industry, which is used to manufacture commercial and military aircraft components requiring high strength and low weight. Examples include gears, piston pins, etc. Other uses of 4130 steel include auto parts, cutting tools and drilling machines.

A214 Carbon steel pipe

A214 carbon steel pipe: resistance welded carbon steel pipe for heat exchanger and condenser.

A53 Carbon steel pipe

Application: It is suitable for stress and pressure parts, as well as steam, water, gas and air pipelines for general purposes. A53 pipeline pipe belongs to American petroleum standard pipeline pipe. Pipeline pipe is used to transport oil, steam and water pumped out of the ground to oil and natural gas industrial enterprises through pipeline pipe. Pipeline pipe includes seamless pipe and welded steel pipe, with flat end, threaded end and socket end at the pipe end; The connection methods are end welding, coupling connection, socket connection, etc.

GET A FREE QUOTE