HAYNES HR-120 (UNS N08120) Alloy Forging Parts
China Leading Manufacturer & Supplier

Complete Range of HAYNES HR-120 Forged Products

Our state-of-the-art forging facility in Jiangyin, China, produces a comprehensive range of HAYNES HR-120, UNS N08120, and Alloy HR120 forging steel products in different shapes and sizes, from 30 kg small components up to 30-ton heavy forgings:

Forged Bars & Rods

• HAYNES HR-120 round bars (max diameter: 2000 mm)
• UNS N08120 square bars, flat bars, and rectangular bars
• Alloy HR120 step shafts, gear shafts, and turbine shafts (max length: 15 m)

Seamless Rolled Rings

• HAYNES HR-120 seamless rolled rings (max diameter: 6000 mm)
• UNS N08120 contoured rings, gear rings, and bearing races
• Alloy HR120 seal rings, labyrinth rings, and turbine guide rings

Hollow Forged Components

• HAYNES HR-120 sleeves, bushes, and hollow bars (max OD: 3000 mm)
• UNS N08120 hubs, housings, shells, and casings
• Alloy HR120 pipes, tubes, and heavy-wall cylinders

Flat & Custom Forgings

• HAYNES HR-120 discs, plates, blocks, and flanged blanks
• UNS N08120 tube sheets, baffle plates, and channel flanges
• Custom Alloy HR120 forgings manufactured to your exact drawings

Why Choose HAYNES HR-120 (UNS N08120) Alloy?

HAYNES HR-120 is a solid solution strengthened Fe-Ni-Cr heat resistant alloy specifically produced for extreme high-temperature service up to 1200°C (2200°F). Its carefully balanced composition — approximately 37% Ni, 25% Cr, balance Fe, with deliberate additions of nitrogen and niobium as supplemental solid-solution strengtheners — which has a property profile that consistently outperforms conventional high-temperature alloys in the most demanding industrial environments.

Main Material Advantages

• Exceptional High-Temperature Strength: Significantly higher strength at temperatures up to 1200°C compared to 310S, 309S, and other Fe-Ni-Cr alloys
• Excellent Carburization & Sulfidation Resistance: Outperforms Inconel 601 and 310S in reducing and sulfur-rich environments
• Good Oxidation Resistance: Comparable to commonly used high-temperature alloys in oxidizing atmospheres
• Wide Operating Temperature Range: Qualified for use from cryogenic -184°C (-300°F) up to sustained 1200°C (2200°F)
• Good Fabricability: Can be forged, machined, and welded using standard techniques without special precautions
• Nitrogen-Strengthened: Dissolved nitrogen acts as a supplemental solid-solution strengthener, improving high-temperature creep resistance without sacrificing ductility — a design feature absent in most competing Fe-Ni-Cr alloys

HAYNES HR-120 vs. Five Common High-Temperature Alloys

The comparison below covers the alloys most frequently evaluated alongside HAYNES HR-120 in engineering material selection. The highlighted column shows where HR-120 stands on each criterion. Data represent typical solution-annealed behaviour; all application conditions should be confirmed against current material data.

HAYNES HR-120 High-Temperature Mechanical Properties

For engineers sizing components that must carry sustained mechanical loads above 600°C, room-temperature tensile data alone are never sufficient. The tables below record the elevated-temperature tensile behaviour and stress-rupture capability of solution-annealed HAYNES HR-120 (UNS N08120) forged material. These are the figures our technical team references when assisting customers with component wall-thickness calculations, ring sizing, and remaining-life estimations for in-service inspections.

Elevated-Temperature Tensile Properties (Solution Annealed Condition)

Values represent typical test results for hot-worked and solution-annealed bar material tested in air. Individual heats and product forms vary; the material test certificate (MTC) supplied with each forging from Jiangsu Liangyi records heat-specific values for final verification.

Stress-Rupture Capability (1,000-Hour and 10,000-Hour Rupture Stress)

Creep-rupture data are the foundation for design life calculations in sustained high-temperature service. The 1,000-hour and 10,000-hour rupture stress values below reflect typical solution-annealed UNS N08120 bar behaviour. Detailed rupture curves covering the complete range from 100 h to 100,000 h are available from our technical team upon request for critical design projects.

HAYNES HR-120 Physical & Thermal Properties

The physical and thermodynamic constants of HAYNES HR-120 (UNS N08120) are essential inputs for heat transfer modelling, thermal expansion analysis, electrical resistance heating calculations, and finite-element structural simulations. The data below apply to annealed material; minor variations by product form and processing history are normal.

Physical Constants

Thermal Properties vs. Temperature

HAYNES HR-120 Chemical Composition & Heat Treatment

Chemical Composition (wt%)

Room-Temperature Minimum Mechanical Properties

Manufacturing & Heat Treatment

All our HAYNES HR-120 forgings are produced from raw material melted by using advanced double-melt processes that eliminate segregation and ensure chemical homogeneity throughout the heaviest sections:

• Vacuum Induction Melting + Electro-Slag Re-melting (VIM/ESR)
• Vacuum Induction Melting + Vacuum Arc Re-melting (VIM/VAR)

Hot working parameters are tightly controlled across our 2000T–6300T hydraulic press fleet to produce a uniform, fine-grained austenitic microstructure — the essential precondition for achieving the high-temperature creep and rupture properties listed above.

Standard Heat Treatment: Solution anneal at 2150–2210°F (1177–1210°C), held for sufficient time to dissolve carbide networks, followed by rapid air cooling. This treatment dissolves any carbides precipitated during hot working and restores the alloy to a homogeneous solid-solution condition.

HAYNES HR-120 (UNS N08120) Applicable Standards & Specifications

Procurement engineers and project quality plans require specific standard references. HAYNES HR-120 / UNS N08120 is covered by the following international specifications. Jiangsu Liangyi produces and certifies forgings to any of these standards upon request — please specify the required standard number and revision in your RFQ.

ASTM Standards (Product Specific)

ASME Boiler & Pressure Vessel Code (BPV) Standards

ASME SB-series standards are the BPV Code equivalent of the corresponding ASTM B-series specifications and are required for pressure equipment constructed to ASME Section VIII (Unfired Pressure Vessels) or ASME Section I (Power Boilers). We provide material test certificates meeting ASME requirements upon request.

Other Applicable Certifications & Codes

• EN 10204 3.1 Mill Test Certificate: Provided as standard with all Jiangsu Liangyi HR-120 forgings — includes heat chemistry, mechanical test results, and heat treatment records traceable to the specific forging lot
• EN 10204 3.2 Third-Party Inspection Certificate: Can be arranged through TUV, BV, DNV, ABS, Lloyd's Register, RMRS, RINA and other leading inspection bodies — coordinated at customer's request and cost
• API 6A / API 6D: We can manufacture HAYNES HR-120 forgings to customer-provided API 6A / API 6D drawings and dimensional specifications. Third-party API inspection can be arranged through qualified API inspection bodies upon customer request
• NACE MR0175 / ISO 15156: For sour-service (H₂S-containing) environments, HR-120 forgings can be provided with hardness verification and documentation confirming according to Part 3 requirements for CRAs (corrosion-resistant alloys)

HAYNES HR-120 Weldability, Machining & Fabrication Guide

Understanding the fabrication behaviour of HAYNES HR-120 (UNS N08120) is essential for downstream processors and end-users who will perform joining or machining operations after receiving forgings from Jiangsu Liangyi. The guidance below draws on 25+ years of in-house metallurgical experience processing this alloy family across thousands of production batches.

Weldability Overview

HAYNES HR-120 is rated as having good weldability when standard nickel-alloy welding practices are followed. Unlike many precipitation-hardened Ni-base alloys, solution-annealed HR-120 is not susceptible to strain-age cracking during welding — a significant practical advantage when fabricating complex multi-pass assemblies with high restraint.

• Compatible Welding Processes: We can provide different welding processes, such as GTAW (TIG), GMAW (MIG/MAG), SMAW (stick electrode), and Submerged Arc Welding (SAW). GTAW makes the cleanest welds for applications where pressure is important.
• Recommended Filler Metal: For GTAW and GMAW, the best filler metal is ERNiCrFe-10 (AWS A5.14). ENiCrFe-10 coated electrodes work well for SMAW. For non-critical uses, a filler with a matching composition is also fine.
• Preheat Requirement: None required for section thicknesses up to 50 mm under normal ambient conditions (above 10°C). For heavy sections exceeding 50 mm or in cold environments below 5°C, a mild warm-up to 80–100°C removes surface moisture and prevents hydrogen-assisted cracking.
• Interpass Temperature: Keep interpass temperature below 175°C (350°F) which can preserve heat-affected zone toughness and minimize distortion in multi-pass welds on large forging assemblies
• Post-Weld Heat Treatment (PWHT): Not mandatory for most service applications. Where stress relief is required — for instance, in pressure vessel code applications or highly restrained geometries with heavy loading — a complete solution anneal at 1177–1210°C followed by air cooling restores the weld HAZ to its improved microstructure. Partial stress-relief at sub-critical temperatures (e.g., 700–900°C) is not recommended as it can precipitate deleterious carbide networks that reduce ductility and corrosion resistance
• Shielding Gas: 100% Argon or Ar/He blends for GTAW root and fill passes; back-purging with Argon is recommended for root passes on pipe and tube fabrications to get clean, oxide-free ID surfaces

Hot & Cold Forming

• Hot Working Range: 900–1200°C (1650–2200°F). Do not work below 900°C — the alloy work-hardens rapidly in this range and the risk of surface cracking in forgings with tight reductions increases significantly
• Cold Forming: HR-120 is cold-formable but work-hardens approximately 15% faster than Type 304 austenitic stainless steel. Intermediate anneals at 1177–1210°C are required between forming stages for severe deformation sequences

Machining Guidance

HAYNES HR-120 is machinable by using equipment and tooling suitable for high-strength austenitic alloys. Work-hardening tendency in the cut zone is the main variable to manage:

• Tool Material: Carbide tooling (ISO Grade P10–P30 for turning; K10–K20 for milling) is recommended. High-speed steel tools may be used for drilling and tapping but require lower cutting speeds
• Cutting Speed (Turning): 30–50 m/min for roughing; 20–35 m/min for finishing with carbide inserts. Keep positive rake angles to shear rather than plow material, which can reduce heat generation and work-hardening depth
• Feed Rate: 0.15–0.35 mm/rev for turning. Feed rates below 0.10 mm/rev promote rubbing over cutting and accelerate work-hardening of the uncut layer
• Coolant: Flood cooling with a sulphur-free water-soluble cutting fluid is essential throughout all operations. Dry machining is not recommended and will shorten tool life cycle
• Achievable Surface Finishes from Jiangsu Liangyi: As-forged, turned (rough machined to ±3 mm), semi-finished (±1.5 mm), or complete finished to drawing tolerance by using our 5-axis CNC machining centres

Industrial Applications & Global Success Cases

HAYNES HR-120 alloy forgings are the best choice for critical components in industries which need to operate under extreme high-temperature, high-pressure, and corrosive conditions. Our UNS N08120 forgings have been successfully deployed across four continents:

Power Generation Industry

• Gas and steam turbine components: guide rings, seal rings, labyrinth rings, and rotor end rings
• Boiler and heat exchanger components: tubes, tube sheets, and nozzles
• Recuperators and heat treating fixtures

Oil & Gas Industry

• High-temperature, high-pressure (HTHP) wellhead equipment: valve bodies, stems, bonnets, and seat rings
• Refinery components: furnace parts, reactor internals, and process piping
• Offshore platform components

Nuclear Power Industry

• Steam generator components: flow limiter Venturi forgings and divider plates
• Pressurizer surge line forged tubes
• Reactor nozzles, primary pump flywheels, and containment components

Chemical & Waste Processing Industry

• Thermocouple protection tubes for plants that burn trash
• Chemical reactor components and process piping
• Furnace muffles, retorts, and basket liners

Other Industries

• Heat treatment industry: furnace belts, cast link belt pins, and fixtures
• Bearing industry: high-temperature bearings and bearing races
• Aerospace industry: engine components and exhaust systems

Why Choose Jiangsu Liangyi as Your China HAYNES HR-120 Forging Partner?

Jiangsu Liangyi is a top  open die forging manufacturer in Jiangyin, China. We have been making high-quality HAYNES HR-120, UNS N08120, and Alloy HR120 forgings for over 25 years.

Advanced Manufacturing Capabilities

• 80,000 m² modern forging facility in Jiangyin, Jiangsu Province, China
• We can provide complete in-house production such as steel melting to forging, heat treatment, and CNC machining
• Our factory has advanced equipment such as 2000T–6300T hydraulic presses, 1T–9T electro-hydraulic hammers, and 5M seamless rolling machines
• We have 120,000-ton annual production capacity with single-piece forging capability up to 30 tons

Rigorous Quality Control

• ISO 9001:2015 certified quality management system
• 100% non-destructive testing (UT, MT, PT) on all critical components
• Comprehensive in-house testing laboratory: chemical analysis, mechanical testing, and metallographic examination
• Complete traceability from raw material heat number to finished product delivery documentation

Global Certifications & Standards

Our HAYNES HR-120 forgings according to all major international standards and are certified by leading third-party organizations:

• Standards compliance: ASTM, ASME, AMS, API, DIN, EN, JIS
• Third-party inspection available through: TUV, GL, BV, DNV, ABS, Lloyd's Register, RMRS, RINA (arranged upon customer request)
• Available documentation: EN 10204 3.1 Mill Test Certificate, EN 10204 3.2 Third-Party Inspection Certificate

Competitive Advantages

• Cost-Effective: Competitive pricing without compromising on quality, thanks to our efficient manufacturing processes
• Fast Delivery: Standard lead times of 4–6 weeks, but we can expedite our production for urgent orders
• Custom Solutions: We manufacture custom HAYNES HR-120 forgings to your exact drawings and specifications
• Technical Expertise: Our team can provide complete technical support including material selection suggestions, weldability assessments, and component life estimation
• Global Logistics: Convenient shipping from Shanghai and Ningbo ports, with door-to-door delivery options all over the world

Frequently Asked Questions (FAQ)

Related High-Temperature Alloy Forgings

If HAYNES HR-120 isn't the best fit for your needs, Jiangsu Liangyi has a wide range of complementary heat-resistant and corrosion-resistant alloys that can be forged. In our customers' engineering selection processes, the following materials are most often compared to HR-120: