20MnMoNi4-5 (1.6311) Forged Parts Manufacturer in China

20MnMoNi4-5 (1.6311) Main Buying Information

Custom 20MnMoNi4-5 (1.6311) Forged Part Shapes & Forms

We manufacture precision 20MnMoNi4-5 (1.6311) steel forgings in a full range of shapes and sizes, fully customized to your engineering drawings and technical requirements. Our production capabilities cover all types of open die forgings and seamless rolled rings for industrial uses:

20MnMoNi4-5 Forged Bars & Rods

20MnMoNi4-5 forged steel round bars, square bars, flat bars, rectangular bars and solid rods for structural and high-temperature parts

1.6311 Seamless Rolled Rings

1.6311 forged seamless rolled rings, gear rings, contoured rolled rings for pressure vessels, valves and rotating equipment

20MnMoNi4-5 Forged Sleeves & Hollow parts

20MnMoNi4-5 forged steel hubs, housings, shells, sleeves, bushes, bushings, cases and hollow bars for high-pressure uses

1.6311 Forged Discs & Blocks

1.6311 forged steel discs, disks, blocks, plates and forgings for turbine, valve and heavy machinery parts

20MnMoNi4-5 Forged Pipes & Casings

20MnMoNi4-5 forged steel pipes, tubes, tubings, piping shells, casings, case barrels and housings for boiler and petrochemical equipment

20MnMoNi4-5 (1.6311) Material Performance & Main Characteristics

20MnMoNi4-5 is a weldable fine-grained low alloy steel specifically engineered for elevated temperature service in demanding industrial environments.It has great high-temperature stress resistance of 0.2%, good low-temperature impact toughness, good weldability and uniform internal structure after heat treatment.

1.6311 steel is produced using the basic oxygen steelmaking process, with optional secondary refining processes including LF+VD, ESR, PESR according to client requirements. Its good and stable mechanical properties are obtained through controlled water quenching and tempering (QT) heat treatment. It is globally recognized and widely used as plates or formed parts for boilers and pressure vessels operating at temperatures ranging from -20°C to 400°C, fully in accordance with European PED 2014/68/EU pressure equipment directive for EU customers, ASME BPVC for North America, and API 6A for oil & gas projects in the Middle East.

Production Standards for 20MnMoNi4-5 (1.6311) Forgings

All 20MnMoNi4-5 (1.6311) forgings of our company are strictly manufactured in accordance with the international industry standards, including but not limited to:

• EN 10028-2: 2009 Flat products made of steels for pressure purposes - Non-alloy and alloy steels with specified elevated temperature properties
• EN 10250-3: 2000 Open steel die forgings for general engineering purposes - Alloy special steels
• Compatible with ASME standards for North American market and API 6A standards for oil & gas industry

For more information about our full range of alloy steel forging materials, please visit our Materials Page.

Chemical Composition of 20MnMoNi4-5 (1.6311) Alloy Steel

Optional Melting Processes for 20MnMoNi4-5 (1.6311) Material

We provide flexible melting process for all 20MnMoNi4-5 (1.6311) forged materials, customized according to your use requirements and quality standards:

Mechanical Properties of 20MnMoNi4-5 (1.6311) After QT Heat Treatment

All our 20MnMoNi4-5 forging parts are delivered in quenched and tempered (QT) condition, with the following guaranteed mechanical properties, classified by nominal thickness:

Other Guaranteed Mechanical Properties:

• Minimum elongation at break (A): 17-18% (longitudinal), 14% (transverse)
• Transverse impact energy (KV) at -20°C: Min. 40J

Quality Assurance & Certifications for Finished 20MnMoNi4-5 Forged Parts

To ensure the highest quality and full traceability of every 20MnMoNi4-5 (1.6311) forged part we deliver, a full set of certifications and test reports shall be supplied for each shipment, including as a minimum the following:

• Heat treat batch number or code, heat lot identification, unique heat number
• Material Test Report (MTR 3.1/3.2) with full chemical analysis and tensile properties test results
• Impact properties test results (when required by purchase order)
• Hardness test results (2 readings of the QTC, with full QTC size and test results)
• Nondestructive Testing (NDE) reports (when required), fully traceable to each material/part by unique identification number
• Certificate of Compliance, part number and full product description
• Complete heat treat cycle description (applicable times, temperatures, start and finish quench temperature for water quenches)
• Any other requirements specified by purchase order or engineering drawings

Industry Uses & Global Case Studies

20MnMoNi4-5 (1.6311) is a weldable fine-grained steel with good high-temperature strength, stable yield performance, and low-temperature impact resistance, making it the best material for critical industrial parts under hard working conditions. Below are our verified global cases for 20MnMoNi4-5 forged parts, serving customers across more than 50 countries:

Boiler & Pressure Vessel Core Parts

Our 20MnMoNi4-5 forged plates, seamless rolled rings and pipes are widely used in industrial steam boilers, high-pressure vessel shells and heat exchanger parts. These parts operate stably in the temperature range of -20°C to 400°C, fully in accordance with EN 10028-2 standard and PED directive, and have been supplied to more than 30 boiler manufacturing enterprises across Europe, Southeast Asia and the Middle East.

Petrochemical High-Pressure Reactor & Pipeline Assemblies

We provide custom 1.6311 forged sleeves, bushings and hollow bars for petrochemical high-pressure reactors, hydrogenation units and long-distance high-temperature pipeline systems. The material's stable 0.2% proof stress at elevated temperatures ensures long-term safe operation in corrosive and high-pressure working conditions, with our products used in 10+ large-scale petrochemical projects in the Middle East and North America.

Power Generation Turbine & Generator Parts

Our 20MnMoNi4-5 forged shafts, discs and blocks are core parts for thermal power generation steam turbines, hydroelectric generator rotors and auxiliary power equipment. The quenched and tempered 1.6311 steel has good tensile strength and impact toughness, meeting the strict load and fatigue resistance requirements of power generation equipment, with long-term cooperation with domestic and overseas top power equipment manufacturers.

Offshore Oil & Gas Subsea Equipment & High-Pressure Housings

We supply 20MnMoNi4-5 forged casings, shells and seamless rolled rings for offshore oil and gas subsea Christmas trees, wellhead equipment and underwater pressure vessels.This material has good weldability and low-temperature impact resistance (minimum lateral impact energy of 40J at -20°C), making it suitable for harsh marine working environments. Our products have been certified for Marine projects in the North Sea and Southeast Asia.

Heavy Machinery Hydraulic System High-Pressure Cylinder Blocks

Our 1.6311 forged hollow bars, sleeves and cylinder bodies are widely used in high-pressure hydraulic cylinders for heavy construction machinery, mining equipment and metallurgical machinery. The material's high yield strength and uniform internal structure ensure no deformation or leakage under long-term high-pressure working conditions, we supply more than 500 sets of hydraulic cylinder forgings to global heavy machinery customers every year.

For more details about our global project references, please visit our Reference Page.

How to Order 20MnMoNi4-5 (1.6311) Forged Parts

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Frequently Asked Questions About 20MnMoNi4-5 (1.6311) Forged Parts

Contact Us for 20MnMoNi4-5 (1.6311) Forging Solutions

Send your drawing, required forging weight, heat treatment condition, inspection level and destination country. Our technical sales team will review feasibility and respond with a quotation path within 24 hours for qualified B2B inquiries.