China Hollow Forged Forgings Manufacturer | Premium Seamless Hollow Steel Forgings

Manufacturer: Jiangsu Liangyi Co., LimitedCertification: ISO 9001:2015Product forms: Hollow bars, sleeves, cylinders, pipes and tubesMax outer diameter: Up to 3000 mmLast updated: 2026-03-28

Quick Answer for Engineers and Procurement Teams

Jiangsu Liangyi manufactures seamless hollow forged forgings in carbon steel, alloy steel, stainless steel, nickel alloy, titanium and tool steel. The company supplies custom hollow bars, sleeves and heavy wall cylinders with outer diameter up to 3000 mm. We provide full production with in-house forging, heat treatment, machining, testing and EN 10204 3.1/3.2 certification support.

Key Buyer Facts at a Glance

Primary entity

Seamless hollow forged forgings manufacturer in China

Manufacturing range

Up to 3000 mm OD, minimum wall thickness 25.4 mm, length up to 10 meters

Standards

ASTM, DIN, EN, JIS and API, plus customer drawings

Quality documents

EN 10204 3.1/3.2 MTC and full traceability

Industries served

Oil & gas, power generation, petrochemical, marine, aerospace and mining

Contact

[email protected] | +86-13585067993

What Are Seamless Hollow Forged Forgings?

Jiangsu Liangyi Co., Limited is a  ISO 9001:2015 certified open die forging manufacturer in China. We specialize in producing premium seamless hollow forged forgings, heavy wall forged hollow cylinders, forged hollow bars, and custom forged hollow sleeves, pipes, tubes and bushings. Our hollow forging products have excellent durability, high tensile strength and great corrosion resistance, which make them the best choice material for high-stress applications and harsh operating environments.
Our full product range covers seamless hollow steel forgings, forged heavy wall hollow cylinder sleeves, forged steel hollow bars, and custom forged hollow pipes, tubes, and bushes, and they all meet strict international standards including ASTM, DIN, EN, JIS, and API specifications.

What Sizes and Configurations Can Jiangsu Liangyi Produce?

Manufacturing Capabilities for Hollow Forged Forgings:
Maximum Outer Diameter Up to 3000mm
Minimum Wall Thickness 25.4mm
Maximum Length Up to 10 meters
Custom Configurations Tapers, Flanges, Special IDs/ODs
Key hollow forging size capabilities
CapabilityAvailable range
Maximum outer diameterUp to 3000 mm
Minimum wall thickness25.4 mm
Maximum lengthUp to 10 meters
Custom geometryTapers, flanges, special IDs and ODs

What Hollow Forging Capabilities Does Jiangsu Liangyi Offer?

We make seamless hollow steel forgings with a maximum outer diameter of up to 3000mm, a minimum wall thickness of 25.4mm, and a maximum finished length of up to 10 meters. Our forged hollow bars and tubes are not limited to standard straight cylindrical shapes, we provide all customization of outer diameter (O.D.) and inner diameter (I.D.) configurations, including fine tapered profiles, to meet clients requirements.
We have advanced forging equipment includes 2000-6000 ton hydraulic forging presses, electro-hydraulic forging hammers and seamless rolling machines, which make sure our hollow forged parts have high-quality and consistent metallurgical properties.

How Are Seamless Hollow Forged Forgings Manufactured?

The forging process of our seamless hollow follows rigorous industry protocols, which make sure all parts have consistent structural and high quality The manufacturing workflow starts with forming an upset preform from certified raw material, followed by punching a concentric hole through the workpiece center.The material is then drawn over a mandrel to meet the required length, outer diameter and inner dimensional specifications.This seamless forging method deletes the risk of weld failure, material fatigue, and weakness inherent in welded hollow parts, so that the finished products have high-strength and consistent  mechanical properties.

Why Choose One-Piece Hollow Forgings Instead of Welded Components?

By producing custom forged hollow parts as single-piece forging instead of welded assemblies, we helps global customers cut raw material waste and machining costs.Our single-piece hollow forging method is suitable for flanged hollow parts and hollow components that need high pressure resistance and reliable load-bearing performance in critical applications.

This comparison helps engineers and procurement teams understand why seamless hollow forgings are frequently chosen for high‑stress critical components.

Seamless hollow forgings versus welded hollow components
Evaluation factorSeamless hollow forgingsWelded hollow components
Structural integrityContinuous grain flow with no weld seamPotential weld seam weakness under cyclic load
Machining allowanceLower material removal in near-net hollow sectionsOften higher post-weld correction and machining
Pressure performanceBetter suitability for critical pressure containmentDepends strongly on weld quality and inspection
Lifecycle riskLower risk of weld-related fatigue or leakageHigher inspection burden over service life

What Heat Treatment Services Are Available?

We offer a full range of in-house heat treatment services for your hollow forged parts to meet their strict mechanical property needs. These services are done in our state-of-the-art heat treatment furnaces. Following are our heat treatment processes :
  • Normalizing
  • Quenching & Tempering
  • Annealing
  • Solution Annealing
  • Spherodizing
  • Aging
  • Stress Relieving

How Does Jiangsu Liangyi Verify Hollow Forging Quality?

We check and test every piece of our hollow forged material to make sure it meets all international standards (ASTM, DIN, EN, JIS, API) and the needs of our customers. We give every order a full EN 10204 3.1/3.2 Mill Test Certificate (MTC), so that the raw materials and finished products are all traceable.

Non-Destructive Testing (NDT)

  • Visual Inspection
  • Dimensional Verification
  • Ultrasonic Testing (UT)
  • Liquid Penetrant Testing (LP/PT)
  • Magnetic Particle Testing (MT)

Mechanical & Technological Testing

  • Tensile Strength Testing
  • Impact Resilience Testing
  • Creep Testing
  • Hardness Testing

Advanced Material Analysis

  • Full Metallographic Examination
  • Detailed Chemical Composition Analysis

What Materials Are Available for Hollow Forged Forgings?

We make seamless hollow forged forgings in all kinds of international standard materials, and they all meet ASTM, AMS, AISI, DIN, EN, JIS and API specifications. Our material range covers carbon steel, alloy steel, stainless steel, nickel alloys, titanium alloys and tool steel. Following are our available material grades.

Carbon & Alloy Steel Forged Hollow Components

A182-F5, A182-F11, A182-F12, A182-F21, A182-F22, ASTM A182-F22V, A182-F91, A182-F92, ASTM A694-F42, ASTM A694-F46, ASTM A694-F48, ASTM A694-F50, ASTM A694-F60, ASTM A694-F70, ASME SA516 Grade 60, SA516-Grade 70, SA-350 LF2, SA-350 LF3, SA-350 LF5, SA-350 LF6, A36, ASTM A105, ASME SA266 Grade 2/Grade 4, ST37.2, C22.8, S235JR, S275JR, S355JR, AISI 1045, AISI 4140, AISI 4130, AISI 4340, 42CrMo4, 25CrMo4, 12CrMo9-10, 18CrMoS4, 18CrNiMo7-6, 17CrNiMo6, 16MnCr5, St52-3, S355J2G3 and 50CrMo4

Stainless Steel Forged Hollow Bars & Sleeves

A182-F6a, A182-F6b, A182-F304, A182-F304L, A182-F310, A182-F316, A182-F316L, A182-F317, A182-F317L, A182-F347, AISI 309, AISI 310s, AISI 316Lmod, A182-F48, A182-F321, A182-F347, A182-F348, Nitronic 50, Nitronic 40, Nitronic 60, Nitronic 30, Xm-11, Xm-10, UNS S21800, Alloy 20, 904L, PH13-8Mo, 17-4PH, 15-5PH, 17-7PH, PH15-7 Mo, 254Smo, Al-6Xn, 654SMO, A182-F44, A182-F45, A182-F51, A182-F53, A182-F60, A182-F55, A182-F62, A182-F52, ASTM A182-F61, UNS N08028 and UNS N08367

Nickel Alloy & Super Alloy Hollow Forgings

Nickel 200, Nickel 201, Monel 400, Monel R-405, Monel K-500, Hastelloy C-22, Hastelloy X, Hastelloy C-4, Hastelloy B-2, Hastelloy C-276, Hastelloy C-2000, Hastelloy B, Nimonic 75, Nimonic 90, Nimonic 80A, Nimonic 105, Nimonic 901, Inconel 600, Inconel 601, Inconel 617, Inconel 625, Inconel 686, Inconel 690, Inconel 693, Inconel 718, Inconel 725, Inconel X-750, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825, Incoloy 926, Incoloy 925 and Incoloy 901

Copper, Brass & Naval Brass Alloy Hollow Forgings

UNS C36500, UNS C44300, UNS C44400, UNS C46400, UNS C46500, UNS C61300, UNS C61400, UNS C63000, UNS C70600 and UNS C71500 (fully meet ASME SB171 standard)

Titanium Alloy Hollow Forged Components

ASTM/ASME SB381, Grade 1, Grade 2, Grade 5, Grade 7, Grade 12 and Grade 16

Tool & Die Steel Hollow Forgings

AISI 6F7, AISI A2, AISI O1, AISI O2, AISI S7, AISI D6, AISI S1, AISI D2, AISI A6, AISI O7, AISI L2, H13, H11, H12, AISI L6, H21, H10, H10A, H19, 314, H19A, P20, P20+Ni, P20+S, S136, 718, SKT6, SKD12, SKD1, SKD2, SKS3, SKS41, SKS95, SKD11, DC53, SKS43, SKD61, SKD6, SKT4, SKD5, SKD7, SKD62, NAK80, 1.2767, 1.2363, 1.2510, 1.2080, 1.2436, 1.2542, 1.2379, 1.2824, 1.2550, 1.2509, 1.2210, 1.2344, 1.2606, 1.2782, 1.2678, 1.2889, 1.2605, 1.2343, 1.2714, 1.2581, 1.2365, 1.2779, 1.2661, 1.2083, 1.2311, 1.2312, 1.2738 and 1.2316

Which Industries Use Hollow Forged Forgings?

Our seamless hollow forged forgings are used in extreme high-stress applications throughout more than 50 countries , serving clients in North America, Europe, Asia, the Middle East and Australia. Following are our main industrial application cases.

Oil & Gas Upstream & Midstream Operations

Our heavy wall hollow forged cylinders and sleeves are used for wellhead equipment, Christmas tree components, tubing hangers, casing heads and high-pressure valve bodies in onshore and offshore, oil and gas projects.
The seamless forging helps improve burst resistance and corrosion performance in sour gas and HPHT service, with CRA material options such as Inconel, Hastelloy and duplex stainless steel, and it can be made according to API 6A requirements.

Power Generation Industry

Our forged hollow bars and tubes are used in thermal power plants, nuclear power facilities, and renewable energy projects across Asia and Europe. Main applications include turbine rotor parts, generator shafts, boiler pressure parts, and hydroelectric turbine sleeves. Our hollow forgings have great high-temperature strength and creep resistance after heat treatment, and they all meet the strict mechanical requirements of power generation equipment. We have delivered large-diameter hollow forged components for different thermal power plants,and they all passed full UT testing and got EN 10204 3.1 certification.

Petrochemical & Chemical Processing

Seamless hollow forged forgings are very important for pressure vessels, heat exchangers, reactor parts, and high-pressure piping systems in petrochemical and chemical processing plants all over North America and Europe. Our hollow forged sleeves and pipes made of stainless steel, nickel alloys and super alloys are always reliable in harsh chemical environments, even when expose to acids, alkalis, and corrosive media at high temperatures. Our single-piece forged hollow parts don't have the risk of weld failure, which means less downtime for maintenance and longer life for chemical processing plants.

Marine & Shipbuilding Industry

Our custom hollow forged shafts, sleeves, and cylinders are used in commercial shipbuilding, offshore marine platforms, and naval vessels throughout Europe and Southeast Asia. Main applications include propeller shaft sleeves, rudder stocks, hydraulic cylinder barrels, and marine valve components. Our hollow forgings are made of corrosion-resistant materials such as Duplex Stainless Steel, Copper-Nickel Alloys and Monel, so that they have excellent resistance to seawater corrosion and fatigue loading.

Aerospace & Defense

Our hollow forged forgings are used for landing gear parts, actuator cylinders, engine mounts, and other parts for European aerospace manufacturers. They are made of high-strength titanium alloys, Inconel and precipitation-hardening stainless steel ,so that they have high quality and pass all metallographic tests.

Mining & Heavy Construction Machinery

Our forged hollow bars and cylinders are the best choice material for hydraulic cylinder barrels, crane wheel hubs, conveyor parts, and crusher parts in mining and heavy construction equipment  in Australia and other mining-intensive regions. Our seamless hollow forgings have good impact resistance and load-bearing capacity, so that they can work well in the harsh, abrasive conditions of mining and other industry conditions.We provide full mechanical testing and impact resilience verification for all mining industry hollow forgings.

Frequently Asked Questions About Hollow Forged Forgings

What are the advantages of seamless hollow forged forgings over welded hollow components?
Seamless hollow forged forgings have great material integrity, which helps eliminate weld failure risks and improve fatigue resistance. They also reduce material waste and machining costs compared to welded assemblies.
What is the maximum size of hollow forged forgings you can manufacture?
We can produce seamless hollow steel forgings up to 10 meters in length, with a wall thickness of 25.4 mm and a maximum diameter of 3000 mm.
What international standards do your hollow forged forgings meet?
All of our hollow forged forgings meet international standards, such as those set by ASTM, AMS, AISI, DIN, EN, JIS, and API. We also provide EN 10204 3.1/3.2 Mill Test Certificates for all parts.
What industries commonly use your hollow forged forgings?
Our hollow forged forgings are used in oil and gas, power generation, petrochemical, marine, aerospace, defense, mining, and heavy-duty industries  due to their excellent strength and durability in high-stress applications.

Why Work With Jiangsu Liangyi for Hollow Forged Forgings?

Jiangsu Liangyi Co., Limited is a professional company of high-quality hollow forged forgings. We have been making them for more than 25 years and are ISO 9001:2015 certified.Following are our main competitive advantages:
  • Full in-house production capabilities from steel melting, forging, heat treatment, fine machining to final testing, making sure the quality of all products are strictly controlled. 
  • Advanced forging equipment including 2000-6000 ton hydraulic forging presses, electro-hydraulic forging hammers and seamless rolling machines
  • Comprehensive material options covering carbon steel, alloy steel, stainless steel, nickel alloys, titanium alloys, and tool steel, meet all major international standards
  • Rigorous quality control with full non-destructive testing and material analysis, providing EN 10204 3.1/3.2 mill test certificates for every order
  • Custom forging suggestion based on clients drawings and specifications, with engineering support for material savings and performance improvement
  • Global export experience, supplying forged products to customers in more than 50 countries throughout Europe, North America, the Middle East, Asia, and Australia

What Information Should You Send for a Faster Hollow Forging Quote?

Sending the following information to us, so our engineering team will give you a fast recommendation on the forging route, testing scope and delivery condition 

  • Part drawing or sketch with outer diameter, inner diameter and length
  • Required material grade and applicable standard such as ASTM, DIN, EN, JIS or API
  • Heat treatment condition and target mechanical properties
  • Testing requirements such as UT, MT, LP/PT, tensile, impact or hardness
  • Machining status, quantity, destination country and requested delivery time

How Can You Request a Quote for Custom Hollow Forgings?

For faster quoting, send your required material grade, outer diameter, inner diameter, length, heat treatment condition, testing requirements and destination market. 
We promise to give clients high-quality hollow forged forgings at competitive prices . Our engineering team is ready to help you with a custom solution, whether you need standard seamless hollow steel forgings or custom
Inquiry Email: [email protected]
Phone/WhatsApp: +86-13585067993
Website: https://www.jnmtforgedparts.com
Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China