Forged Steel Gate Valve Wedge Discs | China ISO 9001 OEM Manufacturer & Global Supplier

Quick Product Summary

Forged steel gate valve wedge discs are custom-forged sealing components which used in gate valves for high-pressure, high-temperature, corrosive, cryogenic, and abrasive service. This page explains what Jiangsu Liangyi produces, which materials and coatings can we provide, how we control our quality, and how OEM buyers can choose grades to oil & gas, LNG, petrochemical, power, mining, marine, and water-treatment projects.

Technical Snapshot for Sourcing Teams #

This table is provided for procurement teams, engineers, and AI search systems that need a fast, structured summary before reviewing the full technical sections below. It does not replace the detailed material, process, testing, and case-study content that follows.

Product Overview & Our Manufacturing Advantage#

Jiangsu Liangyi Co., Limited is a professional ISO 9001:2015 certified China open die forging manufacturer, we can provide forged steel gate valve wedge discs. We have over 25 years of industry experience,  80,000 ㎡ production area, and an annual manufacturing capacity of 120,000 tons. As a famous forged parts supplier in China, we export high-quality forging steel gate valve wedge discs to more than 50 countries such as Europe, the Middle East, North America, Southeast Asia, Oceania, and South America. We provide service to global valve manufacturers, oil & gas operators, EPC companies, and industrial project owners.

Our forged steel gate valve wedge discs are the main component of gate valves, responsible for sealing and on-off control of fluid media in high-pressure, high-temperature, corrosive, cryogenic, and bad working conditions. We support complete custom OEM production from steel melting, open die forging, heat treatment, precision CNC machining, surface treatment to final non-destructive testing which follow ASTM, AISI, DIN, EN, API 6A, JIS, NORSOK, and other international standards, as well as client's custom drawings and technical requirements.

Full Range Material Grades & Geo-Targeted Material Selection Guide#

We provide a complete range of material grades for forging steel gate valve wedge discs which customized according to different regional industry standards, working conditions, and media properties. All materials are 100% traceable from melting to final delivery, with chemical composition and mechanical property testing reports.

Standard Material Grades Available

• Carbon & Low Alloy Steel: ASTM A105, SA350 LF2, SA350 LF6, ASTM A694 F42/F50/F52/F55/F60/F65/F70, A182 F11/F12/F22/F91/F92, AISI 1018/1045/1050, 4130/4140/4340/8620/8630, DIN 42CrMo4 (1.7225)/34CrNiMo6 (1.6582)/20CrNiMo (1.6523)
• Stainless Steel: A182 F304/F304L/F304H, F316/F316L/F316LN/F316N, F317, F321/F321H, F347/F347H, 310S/309S, AISI 410SS/420/440C, A182 F6a/F6NM (1.4313), 316Ti, 317LMN/317LN
• Duplex & Super Duplex Steel: 2205 (UNS S31803/S32205), 2507 (UNS S32750), ASTM A182 F51/F53/F44/F55/F60/F61, UNS S31254/S32550/S32760
• Precipitation Hardening Steel: 17-4PH (UNS S17400/AISI 630), 15-5PH, 17-7PH, PH15-7 Mo, A286, Xm-19, FV520B
• Super Austenitic Steel: Nitronic 50/Nitronic 60, Alloy 20, Sanicro 28, 904L, 254Smo, Al-6Xn, 654SMO, UNS N08028/N08367
• Nickel-Based Super Alloys: Inconel 718/625/600/601/725/X-750; Incoloy 825/800/800H/800HT/925/926; Monel 400/K500; Hastelloy C276/C22/C-4/B-2/B-4/G30/G50

Geo-Targeted Material Selection for Global Markets

Advanced Melting & Forging Process for Optimal Product Performance#

To make sure the internal density, mechanical properties, and long life cycle of our forging steel gate valve wedge discs, we use standardized and customizable melting and forging processes, with digital control for every production step. All processes are traceable and recorded in the final EN 10204 3.1/3.2 mill test certificate.

Standard Melting Process Routes

Route 1: Normal Melting Process (For Carbon & Alloy Steel, Standard Applications)

1. Step 1: Basic Electric Furnace (EF) primary to do melting, which can control the basic chemical composition and remove large non-metallic inclusions
2. Step 2: Secondary refining with Argon Oxygen Decarburization (AOD) / Vacuum Oxygen Decarburization (VOD) / Vacuum Degassing, to reduce gas content (H, O, N) and harmful elements (S, P), and to improve steel purity and uniformity.
3. Step 3: Electroslag Remelting (ESR) / Electroflux Remelting (EFR) / Vacuum Arc Remelting (VAR) can be chosen, to further improve the internal structure, lower segregation, refine grain size, and make the material more resistant to impact and fatigue.
4. Optional Step 4: Secondary Vacuum Arc Remelting (VAR) for high demand important applications (e.g., nuclear power, aerospace)

Route 2: High-Purity Vacuum Melting Process (For Stainless Steel, Nickel Alloy, High-Corrosion/High-Temperature Applications)

1. Step 1: Vacuum Induction Melting (VIM), to get precise control of chemical composition in a high-vacuum environment which can avoid oxidation and gas inclusion, and make sure the purity of stainless steel and nickel-based super alloys
2. Step 2: Electroslag Remelting (ESR) / Electroflux Remelting (EFR) / Vacuum Arc Remelting (VAR), to further improve steel density and uniformity, eliminate internal defects, and make sure stable performance in harsh working conditions
3. Optional Step 3: Secondary Vacuum Arc Remelting (VAR) for extreme working conditions (e.g., ultra-high pressure, ultra-low temperature)

Full Forging & Heat Treatment Process

After melting, we use open die forging process with 2000-6000 tons hydraulic forging presses with a forging ratio of no less than 3:1 (up to 6:1 for critical applications) to make sure complete breaking of the cast structure, refine grain size, and improve the mechanical properties of the forged steel gate valve wedge discs. After forging, we do customized heat treatment including normalizing, quenching, tempering, and stress relief annealing, according to material grade and client's technical requirements, to have a better hardness, tensile strength, yield strength, impact resistance, and microstructure.

Custom Surface Treatment Solutions for Geo-Specific Harsh Environments#

The sealing surface of the gate valve wedge disc is the key to make sure long-term reliable sealing and reducing costs. We provide a complete range of precision surface treatment solutions which suitable for the regional working environment and media properties, to improve wear resistance, corrosion resistance, anti-cavitation performance, and extend the life cycle of the product by 2-3 times compared to standard products.

Available Surface Treatment Options

• Base Anti-Corrosion & Wear Treatment: Gas Nitridation, Ion Nitridation, ENP (Electroless Nickel Plating), Hard Chrome Plating
• High-Performance Thermal & Cold Spray: HVOF Tungsten Carbide Coating (HRC 58-62), HVOF Chrome Carbide Coating, Cold Spray Inconel 625 Coating
• Premium Hardfacing Overlay Welding: Stellite 6#/12#/20# Cobalt-Based Alloy Overlay, Inconel 625 Overlay, Nickel-Based Alloy Overlay

Geo-Environment Targeted Surface Treatment Matching

• Middle East Desert Oil & Gas: HVOF Tungsten Carbide Coating (HRC 60) can be used for high wear resistance against sand and abrasive particles in crude oil
• European Chemical & LNG Industry: Stellite 6# Overlay Welding for great corrosion resistance and low-temperature toughness in cryogenic and strong corrosive media
• Marine & Offshore Engineering (Global): Ion Nitridation + 316L Overlay has great anti-corrosion and anti-cavitation when used  in seawater environment
• North America Chemical Processing: Hastelloy C276 Overlay can be used for long-term corrosion resistance against strong acid, alkali, and oxidizing media
• Thermal Power Industry (Southeast Asia): Chrome Carbide Coating can be used for high-temperature oxidation resistance and wear resistance in steam pipelines up to 650℃
• Australian Mining Industry: HVOF Tungsten Carbide + 2507 Super Duplex Steel Base can be used for wear and corrosion resistance in mining slurry pipelines

Global Project Applications & Geo-Targeted Case Studies#

Our forging steel gate valve wedge discs have been commonly used in important industrial projects across more than 50 countries, with proven long-term stable performance in high-pressure, high-temperature, corrosive, cryogenic, and harsh working conditions. Below are the cases of our geo-targeted application:

Middle East: Large-Scale Oil & Gas Wellhead Project (Saudi Arabia)

We produce more than 15,000 pieces of ASTM A694 F60 forged steel gate valve wedge discs for a oilfield development project in Saudi Arabia with a capacity of 1.5 million barrels per day. The client's main issue was severe wear and tear of the wedge disc sealing surface which caused by high sand content (up to 15%) in crude oil, under 42MPa high working pressure. Our solution: do HVOF tungsten carbide coating (HRC 60) on the sealing surface and  100% ultrasonic testing (UT), magnetic particle inspection (MPI), and API 6A standard testing. All products passed the client's third-party inspection by SGS, and have been operating stably for more than 6 years without any sealing failure.

European Union: Large Petrochemical Refinery Project (Germany)

We customized Hastelloy C276 and Inconel 625 forged gate valve wedge discs for refinery project in Germany with a capacity of 450,000 barrels per day, we process the parts according to PED 2014/68/EU and DIN EN standards. The products are used in strong acid and alkali corrosive media pipelines, with working temperature up to 480℃. We use VIM + ESR double melting process to make sure material purity, with Stellite 6# overlay on the sealing surface, and made 100% intergranular corrosion testing and hardness inspection. All products were provided with EN 10204 3.2 certificate with TUV third-party inspection, and have been operating for more than 6 years.

North America: LNG Terminal Project (USA)

We provided SA350 LF2 low-temperature carbon steel forged gate valve wedge discs forma LNG terminal project on the US Gulf Coast with a capacity of 18 million tons per year. The main challenge was to make sure the impact toughness of the product at -196℃ ultra-low cryogenic temperature. We use improved quenching and tempering heat treatment process, then do Charpy V-notch impact testing at -196℃ (average impact energy ≥ 27J), and passed all NDT testing including UT, MPI, and X-ray inspection. Our products have been used stably in the LNG storage and transmission system for 4 years.

Southeast Asia: 660MW Thermal Power Plant Project (Indonesia)

We provided ASTM A182 F91 heat-resistant alloy steel forged gate valve wedge discs for the main steam pipeline system of a 660MW coal-fired power plant in Indonesia, our products can be used in working conditions with temperature up to 590℃ and working pressure up to 17.5MPa. We use ESR melting process with high-temperature tensile testing and creep resistance testing to optimize the internal structure. All the products are provided with complete heat treatment records and EN 10204 3.1 certificate. The products have been used for more than 3 years, with no deformation or sealing failure.

Oceania: Mining Slurry Pipeline Project (Australia)

We made 2507 super duplex steel forged gate valve wedge discs for a big iron ore mining slurry pipeline project in Western Australia. The client's issue was high-concentration (60%) iron ore slurry and brackish water caused serious wear and corrosion . Our solution is to do HVOF chrome carbide coating on the sealing surface, with pitting corrosion testing and hardness inspection, 100 according to Australian AS standard. The products have been operating for 3 years, its life cycle can be extended 3.5 times longer than the previous supplier's products.

Strict Geo-Compliant Quality Control & Global Certifications#

Quality is the key of our business and the foundation of our long-term cooperation with global clients. All our finished forging steel gate valve wedge discs have complete process quality control, from raw material incoming inspection to final delivery inspection, to make sure 100% qualified products before delivery. We provide official inspection certificate according to EN 10204 3.1/3.2 standard for every batch of products, and support third-party inspection by SGS, BV, TUV, Lloyd's Register, and other international authoritative institutions.

Full Scope Non-Destructive Testing (NDT)

• Ultrasonic Testing (UT) acc. EN10228-3 Class 3 C, for internal consistency and defect inspection
• Magnetic Particle Inspection (MPI) acc. EN10228-1 Class 4, for surface and near-surface crack detection
• X-ray Radiographic Testing (RT), for internal fine defect inspection
• Dye Penetrant Inspection (DPI), for non-magnetic material surface defect inspection
• Hardness Testing acc. DIN EN 10003-1 (Brinell) / DIN EN 10109-1 (Rockwell C), tested at 3 spots across the total length

Complete Mechanical & Chemical Performance Testing

• Tensile Testing acc. DIN EN 10002-1: Tensile strength, 0.2% yield strength, elongation, reduction of area
• Charpy Impact Testing acc. DIN EN 10045-1: Average value of 3 tests with ISO-V notch specimen, including low-temperature impact testing for cryogenic materials
• Chemical Composition Analysis: Complete element analysis with direct-reading spectrometer, to make sure to follow material standard requirements
• Metallographic Analysis: Grain size inspection, inclusion rating, microstructure analysis
• Surface Roughness Rz Inspection in the sealing surface and bearing area
• Corrosion Resistance Testing: Intergranular corrosion testing, pitting corrosion testing for stainless steel and nickel alloy materials

EN 10204 3.1 Inspection Certificate Includes

1. Full Chemical Composition Report
2. Melting Method and Forging Process Record
3. Complete Mechanical Performance Test Results
4. Heat Treatment Details (Normalizing, Quenching, Tempering, Stress Relief Annealing)
5. Full NDT Testing Qualification Report
6. Dimensional Inspection Record (With Actual Measurement Data)
7. Surface Roughness Test Result
8. Material Traceability Number and Heat Number
9. Certificate follow International Standards

Our Certifications & Compliance Standards

• ISO 9001:2015 Quality Management System Certification
• EN 10204 3.1/3.2 Mill Test Certificate (3.1 issued by our quality department; 3.2 available with third-party witness inspection)
• Products manufactured to API 6A standard requirements upon customer request
• PED 2014/68/EU compliant products available upon request with third-party Notified Body inspection (e.g. TUV, BV)
• Third-party marine inspection by ABS, DNV, or Lloyd's Register available upon request
• Materials comply with NACE MR0175 sour service material requirements upon request

Full-Cycle Custom OEM Production for Global Clients#

As a professional China OEM forging manufacturer, we provide one-stop custom forging production for global valve manufacturers, EPC companies, and project owners, according to your drawings and technical requirements. We have full production cycle:

1. Technical Support: Our professional engineering team will review your drawing, help you to select suitable material and provide best price for your project within 24 hours. 
2. Custom Production: We process the custom products according to your drawings, material requirements, technical standards
3. Precision Machining: We have In-house CNC machining center, so we can provide precision machining and make sure dimensional tolerance meets your requirements (up to IT6)
4. Quality Inspection: We have strict quality control of our process, with complete testing records and official inspection certificate
5. Global Logistics & After-Sales: We have different shipping ways (sea/air/express), door-to-door delivery service, and full after-sales technical support. No matter you need small-batch custom forged steel gate valve wedge discs for a project, or long-term stable supply for your valve production line, we can provide you with the most suitable solution with best quality and factory-direct price.

Frequently Asked Questions#

RFQ Checklist for Quotation

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