API 6A forged steel casing spools are pressure-containing wellhead parts used to suspend casing strings, control annulus pressure, connect wellhead equipment and build reliable Christmas tree assemblies. Jiangsu Liangyi supplies casing, adapter, drill, tubing, spacer and riser spools in forged alloy steel, stainless, duplex and nickel alloy grades for onshore, offshore, sour service, low-temperature and HPHT projects.
Jiangsu Liangyi Co., Limited is a professional China-based manufacturer of API 6A compliant forging steel casing spools, with over 25 years of experience in open die forging and custom oilfield wellhead part production. Our main products includes forging steel adapter spools, forging steel drill spools, forging steel tubing spools, forging steel spacer spools, forged steel riser spools, and forging steel casing head spools, and they are used for oil and gas wellhead Christmas tree systems.
Our factory is 80,000 square meters and has modern tools for making and inspecting things. We can forge 120,000 tons of steel each year and can make custom parts from melting steel, forging it, heat treating it, and fine machining it.All parts meet the client's drawings, API 6A standards, and the standards for the oilfield industry around the world. Our forged steel wellhead spools are exported to more than 50 countries, serving onshore and offshore oil and gas projects in the Middle East, North America, Europe, Southeast Asia, South America, Australia, and Africa.
Our API 6A wellhead spools are great at controlling pressure, don't corrode easily, and work well for a long time, even in the toughest downhole conditions, like high-pressure high-temperature (HPHT) wells, sour service wells with H2S and CO2, low-temperature offshore applications, and deepwater drilling projects. We are an ISO 9001:2015 and API 6A certified manufacturer, which means that we follow the strictest quality standards at every stage of production.
Our full line of forging steel wellhead spools meet API 6A 20th Edition standards, and they are made based on clients requirements. Following are the mian technical specifications :
| Technical Parameter | Standard Range & Customization | Applicable Products |
|---|---|---|
| Rated Working Pressure | 2000 PSI ~ 10000 PSI (13.8MPa ~ 69MPa), custom up to 15000 PSI for HPHT applications | All Forged Wellhead Spools (Casing, Adapter, Drill, Tubing, Spacer, Riser Spools) |
| Nominal Bore Size | 1-13/16" ~ 21-1/4", fully customizable per well design | Forged Steel Tubing Spools, Casing Spools, Adapter Spools |
| Working Medium Compatibility | Crude oil, natural gas, drilling mud, and gas containing H2S, CO2, and other corrosive media | All Forged Wellhead Spools |
| Working Temperature Range | -46°C ~ 121°C (Class LU), custom low-temperature grade down to -60°C for arctic and North Sea applications | Forged Steel Drill Spools, Riser Spools, Casing Spools |
| API 6A Material Class | AA, BB, CC, DD, EE, FF, HH, with full NACE MR0175 compliance for sour service | Forging Steel Spacer Spools, Casing Spools, Adapter Spools |
| API 6A Specification Level | PSL1, PSL2, PSL3, PSL4, with full testing and documentation for each level | Forging Steel Drill Spools, All Wellhead Spools |
| End Connection Type | Flanged end (API 6B, API 6BX), threaded outlets, studded outlets, custom per client drawings | All Forged Wellhead Spools |
| Single Piece Weight Range | 30KG ~ 30,000KG, with seamless rolled ring forging for large-diameter spools | All Custom Forged Wellhead Spools |
Use this quick matrix to match operating conditions with the right spool type, material direction and compliance focus before submiting drawings for quotation.
| Application Scenario | Recommended Spool Type | Preferred Material Direction | Key Compliance Focus |
|---|---|---|---|
| Standard onshore oil or gas well | Casing spool / tubing spool | AISI 4130 / 4140 low alloy steel | API 6A PSL1-2, pressure test, dimensional inspection |
| Sour service with H2S or CO2 | Casing spool / adapter spool / tubing spool | NACE-controlled 4130 / 4140, duplex, nickel alloy | NACE MR0175 / ISO 15156, hardness control, SSC resistance |
| High-pressure drilling or BOP stack operations | Drill spool | High-strength alloy steel forging | API 6A PSL3-4, hydrostatic testing, NDT and load integrity |
| Wellhead retrofit with mismatched flanges | Adapter spool / spacer spool | 4130 / 4140 or stainless based on media | Connection compatibility, full pressure integrity validation |
| Offshore, deepwater or low-temperature service | Riser spool / tubing spool / casing spool | F6NM, duplex, super duplex or nickel alloy | Low-temperature toughness, fatigue resistance, traceability |
Choose casing spools for casing suspension and annulus access, adapter spools for mismatch transitions, drill spools for BOP and intervention spacing, tubing spools for production string support, and riser or spacer spools for precise vertical separation and offshore connection.
Low alloy steels fit conventional service, stainless grades fit moderate corrosion, duplex grades suit marine chloride environments, and nickel alloys are used for the harshest sour service, HPHT and subsea conditions.
For export projects, do not wait until production to discuss API 6A PSL level, NACE requirements, EN 10204 cetification, third-party inspection or end-user approval packages.
Many retrofit delays come from flange mismatch, bore conflicts or outlet layout changes. Adapter and spacer spools should be reviewed against the full wellhead stack, not as isolated parts.
Each of our API 6A forged wellhead spools is made to solve specific industry challenges, and they have improved operational safety, reduced maintenance costs, and longer lifetime in critical oilfield applications. Our engineering team, with over 100 years of combined experience in oilfield forging, making sure every product meets or exceeds API 6A requirements and client expectations.
Main Function: Casing head spools are the most improtant pressure-containing part in the wellhead system, used to suspend and secure casing strings, control wellhead pressure, and provide a flanged connection between the casing head and tubing head, forming an integral part of the wellhead Christmas tree system.
Our forging steel casing spools have a precision-machined straight bore bowl with a 45° landing shoulder design, which deletes damage to sealing areas from drilling tools during tripping operations, and prevents wedging issues with test plugs and bowl protectors when high pressure is applied. This design deletes the chance of seal failure and well control problems, which are common problems in high-pressure drilling operations.
We supply casing spools standardly furnished with threaded outlets and studded outlets for casing hangers, pressure gauges, and bleed valves, and can fully customize the design for single completion or dual completion models, as well as deviated and horizontal well applications. Our casing spools are used in onshore conventional oilfields, shale gas wells, and offshore platform wellhead systems around the world, including major projects in the Middle East, North America, and Southeast Asia.
Internal Link: Explore our full range of custom forged oil and gas components for wellhead systems.
Core Function: Adapter spools join two parts of a wellhead that have different sizes of flanges, pressure ratings, or types of end connections. This means that new parts can work with old wellhead equipment without having to replace the whole system.
Our forged steel adapter spools for API 6A fix the biggest problem in the industry: wellhead systems that don't work together when they are upgraded or retrofitted. This cuts down on project costs and downtime by a lot.
We make adapter spools with end-connection sizes, pressure ratings, and flange standards that match or are different from each other. We also do full pressure integrity testing to make sure they meet all API 6A requirements.
All adapter spools are made from a single piece of high-quality alloy steel. This means that there is no chance of weld failure and the spools will stay strong for a long time.We have sent adapter spools to more than 30 countries around the world for projects to upgrade wellheads.
Main Function: Drill spools are installed between the blowout preventer (BOP) stack and the casing head, providing additional space for well intervention operations, pressure monitoring, and choke and kill line connections during drilling operations.
Our forging steel drill spools are used for high-pressure dynamic drilling conditions, and they have improved strength to bear the vibration and impact of drilling operations. Our drill spools fully meet API 6A PSL1-4 and can work in temperatures down to -46°C , so that they are used for cold climate and offshore applications. Each drill spool is hydrostatically tested to 1.5 times the rated working pressure before delivery, maing sure all of them have reliable performance even in extreme well control operations. Our drill spools have been used in major shale gas projects in North America and deepwater drilling projects in the Gulf of Mexico.
Main Function: Tubing spools are the topmost part of the casing head system, used to suspend tubing strings, seal the annulus between tubing and casing, and provide a connection point for the Christmas tree production wing.
Our forged steel tubing spools are available in nominal bore sizes from 11" to 21-1/4", with customizable tubing hanger profiles and outlet configurations. We manufacture tubing spools with corrosion-resistant materials for sour service production wells, ensuring long-term sealing integrity and reducing the risk of production downtime due to part failure. Our tubing spools are compatible with all major Christmas tree manufacturers' equipment, including Cameron, FMC, and GE Vetco Gray, making them the best choice material for well completion and workover projects around the world.
Main Function: Spacer spools (also known as space spools) and riser spools are pressure-containing wellhead adapter parts, designed to provide vertical separation between two wellhead parts, adjust spacing for valve operation and maintenance access, and connect the wellhead to the riser system in offshore applications.
Our spacer spools and riser spools are made from integral alloy steel forging, and they all meet API 6A standards. Unlike casing and tubing spools, these adapter spools have no provision for suspension or sealing of tubular members, focusing instead on maintaining pressure integrity and precise spacing of the wellhead system.
We have two main types of products: standard spacer spools for adjusting the spacing of onshore wellheads and heavy-duty riser spools for offshore and deepwater drilling. The heavy-duty riser spools can handle more weight and are less likely to break down in rough offshore conditions. You can get all of our spacer and riser spools with the same or different end connector sizes and pressure ratings. They can be made to fit your wellhead design perfectly. We have successfully used our riser spools on offshore projects in the North Sea, Southeast Asia, and Brazil.
Internal Link: Learn about our advanced forging and machining equipment that ensures the precision of our wellhead spools.
As a global supplier of API 6A forged wellhead spools, we make sure our products fully meet the latest API 6A standards, as well as the regional regulatory and certification requirements of our target markets, making sure your projects get seamless acceptance and compliance forworldwide. Our quality management system is certified to ISO 9001:2015, and all products are manufactured in accordance with API 6A 20th Edition requirements.
We manufacture our API 6A forging steel wellhead spools with a full range of material grades, and they all meet ASTM, AISI, API 6A, DIN, EN, and NACE standards. Below is our professional material selection guide based on different working conditions, making sure your project get great performance and cost-effectiveness. Our metallurgical engineers are available to provide free material selection suggestion for your specific application.
Grades: AISI 4130, AISI 4140, AISI 4340, AISI 8620, ASTM A694 F52/F60/F65/F70, 42CrMo4, 34CrNiMo6
Applicable Conditions: They are used for standard onshore oil and gas wells, non-corrosive environments, working pressure up to 10000psi, temperature range -29°C~121°C
Main Advantages: Very strong mechanically, can be hardened, cheap, easy to machine and weld. Great for traditional oilfields in North America, Asia, and the Middle East.
Grades: AISI 410SS, F6NM (1.4313), 17-4PH, 15-5PH, A182 F11/F22
Applicable Conditions: Low-temperature applications (-46°C~121°C), mild CO2 corrosion, wet CO2 environments, offshore temperate climate projects in the North Sea and Canada
Main Advantages: Very strong, resistant to corrosion, and able to handle sour service with the right heat treatment. Great for offshore projects in Europe and North America.
Grades: A182 F51 (2205), F53 (2507), F44, F55
Applicable Conditions: They are used in offshore and underwater,places with a lot of CO2 and chloride corrosion, being in seawater, and moderate amounts of H2S,the best material for offshore projects in Southeast Asia, Australia, and Brazil.
Main Advantages: Very strong, very resistant to pitting and crevice corrosion, very resistant to stress corrosion cracking, and lasts a long time in marine environments. They can work under deep water.
Grades: Monel 400/K500, Inconel 625/718/725/X750, Incoloy 825/925/945, Hastelloy C276
Applicable Conditions: They are the best choice material for severe sour service with high H₂S and CO₂, HPHT wells, deepwater subsea applications, and highly corrosive acid gas environments.
Used in the most demanding projects across the globe.
Main Advantages: they have unmatched corrosion and oxidation resistance, excellent high-temperature performance, superior sulfide stress cracking resistance, long-term reliability in extreme conditions. The premium choice for critical applications.
Internal Link: Explore our full range of forging material grades and custom material solutions.
We use industry-leading integrated manufacturing processes, from in-house steel melting to final fine machining, making sure every forged wellhead spool is fully controlled over the quality and performance. We have advanced equipment,and our technicians are skilled with more than15 years of experience in forging. Following are our melting routes :
We use 2000T-6300T hydraulic forging presses and 1T-9T electro-hydraulic forging hammers, with a 5M seamless rolling machine for large-diameter ring forgings. We perform full heat treatment (normalizing, quenching, tempering, stress relief annealing) in our ten computer-controlled heat treatment furnaces, making sure each material grade has great microstructure and mechanical properties . All heat treatment cycles are fully documented and traceable.
We have a full in-house quality control laboratory with advanced inspection equipment.Every forged wellhead spool is inspected and tested 100% before it is shipped. Our quality control team has more than 25 certified NDT inspectors and metallurgical engineers, making sure every product meets the strictest quality standards. Following are our inspection capabilities:
All our finished forged wellhead spools are supplied with an EN 10204 3.1 Inspection Certificate (3.2 third-party certification available upon request), which includes full details of chemical composition, melting method, mechanical test results, NDT results, heat treatment records, dimensional inspection records, and surface roughness verification. All documentation is fully traceable and archived for a minimum of 10 years.
Our API 6A forging steel wellhead spools are used in oil and gas projects in more than 50 countries, and they have reliable performance in diverse onshore and offshore environments. We provide clients more than 50,000 wellhead spools without product failures reported. Following are our actual global project cases:
Client Pain Point: The client required high-volume API 6A casing spools and tubing spools for a large sour oilfield development project, with strict ARAMCO specification compliance, NACE MR0175 compliance for H2S-containing environments, and zero defect requirements for long-term production stability. The project involved over 500 wells with a 10-year production guarantee requirement.For a big sour oilfield development project, the client needed a lot of API 6A casing spools and tubing spools. These had to meet strict ARAMCO specifications, NACE MR0175 standards for environments with H2S, and have no defects to ensure long-term production stability. The project had to drill more than 500 wells and guarantee production for ten years.
Our Solution: We sent out more than 1500 sets of API 6A forging steel casing spools, tubing spools, and spacer spools.They are made of AISI 4130 and AISI 4140 alloy steel that meets NACE standards. They can withstand pressures from 3,000 to 10,000 psi, with ratings meeting API 6A PSL 3 and HH material class.
Each unit undergoes complete NDT, sour service hardness testing (≤22 HRC), and hydrostatic pressure testing.
Project Outcome: All of our products have worked well for more than six years without any quality problems, and we are now a long-term approved supplier for the client's future oilfield development projects. Since then, we have sent them more than 3,000 extra wellhead spools for their expansion projects in the Middle East.
Client Pain Point: The client needed custom high-pressure drill spools and adapter spools for unconventional shale gas extraction in the Permian Basin and Western Canadian Sedimentary Basin, requiring 10000psi rated working pressure, API 6A PSL4 compliance, and fast delivery to match the client's fast-paced drilling schedule of more than 20 wells per month.
Our Solution: We provided the client over 1000 sets of API 6A forging steel drill spools, adapter spools, and riser spools .All parts are made from AISI 4330V mod alloy steel, and they all fully meet NACE MR0175,10000psi working pressure and API 6A PSL4 specification level. We improved our production plan and shortened the lead time in four weeks. All products meet the client's automated wellhead installation system. We also stored a dedicated inventory in Houston for just-in-time delivery.
Project Outcome: Our products helped the client reduce the on-site installation time by 35% and improved drilling efficiency.They have been used in more than 800 shale gas wells , and have great resistance to fatigue and pressure. We have been their long term supplier for wellhead spools. They will order more than 500 units from us every year.Our products cut the client's installation time on-site by 35% and made drilling more efficient.They have been used in over 800 shale gas wells and have great resistance to fatigue and pressure. We are still their main supplier of wellhead spools, and they order more than 500 units from us every year.
Client Pain Point: For a project to develop a marginal oilfield in the North Sea, the client needed wellhead spools that could work in very cold weather.These parts must pass strict PED CE certification, EN standards compliance, low-temperature toughness tests at -46°C, and be very resistant to corrosion in marine environments. There were strict environmental rules for the project, and all of the documents had to be able to be traced back to their source.
Our Solution: We provide the client API 6A forging steel casing spools, spacer spools, and adapter spools.These parts are made of F6NM stainless steel and A182-F22 alloy steel, which are both strong even when it's cold. They can work at temperatures between -46°C and 121°C (Class LU), meet the API 6A PSL3 specification level.We did Charpy impact tests at -46°C on each heat of material (average 40J+), and DNV gave us full EN 10204 3.2 third-party inspection certification. We also helped with the full installation and commissioning of the offshore project.
Project Outcome: All products passed the client's strict offshore quality verification, have been working stably in the North Sea for more than 4 years, and we have secured subsequent orders for the client's other offshore projects in the North Sea. Our products have withstood severe winter conditions without any performance issues.
Client Pain Point: The client needs to improve the wellhead system for 120 production wells that are already in use. They needed new tubing spools and riser spools that were resistant to corrosion from seawater and CO2 and could work with the existing wellhead system from several different manufacturers. To keep production downtime to a minimum, the project had to be done in three months.
Our Solution: We supplied the client with more than 1,500 forged steel tubing spools, adapter spools and riser spools. Made from duplex stainless steel A182-F51 (2205), these parts have excellent resistance to pitting and crevice corrosion (PREN ≥ 34) in seawater and CO₂-rich environments. We changed the size of the flanges and the connections to make sure they would work with the client's wellhead equipment. This help client cut about 40% of the total project cost.With our fast production process, we were able to finish the whole order in just ten weeks.
Project Outcome: We delivered the entire order within three months, which helped the client finish the wellhead upgrade on time. The new wellhead system can handle more pressure and is more stable, and maintenance costs have gone down by 30%. The client has reported zero corrosion-related issues after 3 years of operation.
Internal Link: View more of our global project references and client success stories.
A casing spool is a main pressure-containing wellhead part that suspends and secures casing strings, controls wellhead pressure, and provides a flanged connection between the casing head and tubing head, forming a critical part of the oil well Christmas tree system. It enables pressure testing, circulation, and well intervention operations while ensuring sealing integrity of the wellbore, preventing blowouts and well control incidents. Casing spools are essential for both onshore and offshore drilling and production operations.
API 6A certified pressure-containing wellhead adapters include spacer spools and riser spools.
Spacer spools are primarily used to keep vertical separation between two wellhead parts, adjust spacing for easier valve access and maintenance, or accommodate different flange sizes and pressure ratings for onshore and shallow-water applications.
Riser spools are robust parts used for offshore and deepwater drilling, capable of withstanding greater loads, dynamic stresses and pressures. They connect the wellhead to the marine riser system, having great strength, fatigue resistance and corrosion resistance in harsh offshore environments.
Both types are essential for the safe and efficient operation of wellhead systems.
Jiangsu Liangyi makes API 6A wellhead spools of levels PSL1, PSL2, PSL3, and PSL4. PSL1 is for standard onshore low-pressure non-critical applications, with basic testing and documentation requirements. PSL2 and PSL3 are for medium to high pressure conventional oilfields, with improved material testing, NDT inspection, and documentation. PSL4 is for important high-pressure high-temperature (HPHT), sour service, and offshore deepwater applications. It has the strictest requirements for material control, testing, inspection, and documentation set by API 6A. We can help you choose the right PSL level for your needs.
To prevent sulfide stress cracking (SSC) and corrosion in H₂S- and CO₂-containing sour service wellhead spools, we use these materials which meet NACE MR0175 / ISO 15156 standards.Low-alloy steels such as AISI 4130 and AISI 4140 with controlled hardness (≤22 HRC) are suitable for mild sour service.
Martensitic stainless steels like F6NM and precipitation-hardening stainless steels such as 17-4PH are the best choice materials for moderate sour service. Duplex stainless steels F51/F53 and nickel alloys like Inconel 625, Inconel 718, and Monel K500 have the best corrosion resistance and SSC performance for very sour service with a lot of H2S, CO2, and chloride. Our metallurgical engineers can provide free material selection suggestion for your specific sour service conditions.
Yes. Jiangsu Liangyi provides a full range of custom manufacturing services for API 6A forged wellhead spools, from in-house steel melting, open die forging, heat treatment, rough machining to final machining, strictly according to your custom drawings, technical specifications, and project requirements. Our engineering team also provides free material selection suggestion, design optimization, and technical support to make sure the product perfectly meet your working conditions and application requirements. We support both one piece sample orders and large-volume mass production orders, with different lead times to match your project schedule. We can also reverse-engineer existing components if drawings are not available.
Our API 6A wellhead spools are manufactured to API 6A 20th Edition standard and our quality management system is ISO 9001:2015 certified. Products are also manufactured in compliance with NACE MR0175 / ISO 15156 for sour service, and to PED 2014/68/EU requirements for the European market. As a standard, we also offer EN 10204 3.1 inspection certificates. If you need 3.2 third-party certification from DNV, BV, or ABS, just ask. Our products are manufactured in accordance with specifications referenced by ARAMCO, ADNOC, KOC, PDO, and other major oil companies for projects around the world. We can offer different documentation packages for different regions and project needs. You can contact us to confirm current certification scope.
Usual lead time is 4-6 weeks for small to medium orders (10-50 units), and 8-12 weeks for large-volume or PSL4 orders (more than 50 units). We can speed up production for urgent orders with 2-3 week lead times upon request.
Go to the quotation section when you are ready to send specifications or drawings.
As a professional China manufacturer with over 25 years of forging experience and ISO 9001:2015 certification, manufacturing to API 6A standard, we can provide clients customized forging steel casing spools, adapter spools, drill spools, tubing spools, spacer spools, and riser spools according to clients drawings and technical requirements. We provide competitive prices starting from USD 2/kg, high quality, and fast delivery.
Contact our expert team today for a free quotation. We will respond within 24 hours with a detailed proposal, including material recommendations, production timeline, and competitive pricing.
Inquiry Email: [email protected]
Phone/WhatsApp: +86-13585067993
Website: https://jnmtforgedparts.com
Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China