INCONEL 602CA Forgings Seamless rolled rings, flanges, bars, discs and shafts in UNS N06025 / W.Nr. 2.4633, forged to order in Jiangyin, China

Chemical composition of INCONEL 602CA (UNS N06025)

Every INCONEL 602CA heat we forge is certified against the limits below. Values are mass percentages and nickel is the balance, typically around 61 %.

The high carbon content of 0.15 to 0.25 % is intentional. It forms stable primary chromium and titanium carbides that pin the grain boundaries and give the alloy its creep strength above 1000 °C. Aluminium and yttrium build the adherent alumina sub-layer that provides oxidation resistance under thermal cycling. Some national specifications list slightly different Mn or Si limits, so state your governing specification on the order and we will certify to it.

Mechanical properties of INCONEL 602CA forgings

Room-temperature minimum properties for solution-annealed INCONEL 602CA forgings to ASTM B564, listed by ruling section.

Physical properties at 20 °C

Elevated-temperature and creep-rupture data are available on request for a given design temperature and ruling section. In the solution-annealed condition this alloy loses rupture ductility in the region of 649 to 760 °C (1200 to 1400 °F), which should be allowed for at the design stage.

Which specifications and equivalents does INCONEL 602CA meet?

How we forge and heat treat INCONEL 602CA

The hot-working window for INCONEL 602CA is narrow and grain size has a direct effect on creep life, so the production route is fixed and recorded on every order.

1. Melting, EAF + VOD + ESR

The heat is melted in an electric arc furnace, refined by vacuum oxygen decarburisation to control carbon and gas content, then electroslag remelted. ESR gives the low sulphur content, tight segregation and clean inclusion rating that INCONEL 602CA needs for repeated thermal cycling.

2. Open-die forging, 1200 °C down to 900 °C

Hot working runs from about 1200 °C down to a finishing temperature near 900 °C, with reheats as required so that deformation takes place inside the window rather than below it. Forging reduction is planned to break down the as-cast structure through the full section and to give the grain flow the part needs, circumferential in a rolled ring and axial in a shaft.

3. Solution annealing at approx. 1220 °C

Parts are solution annealed at approximately 1220 °C and then air cooled or water quenched. Where the component will operate continuously in the 600 to 750 °C band, a stabilizing anneal at about 950 °C for 3 hours is added. Solution annealing is repeated after any hot working and after cold forming above about 7 %.

4. Machining, testing and release

Forgings are rough or finish machined to your drawing, then ultrasonically tested to EN 10228-3, SEP 1921 or ASTM A388 at the acceptance class you specify. Release documentation is EN 10204 3.1 as standard, or EN 10204 3.2 witnessed by TÜV, BV, SGS, DNV or Lloyd's Register. Positive material identification, hardness survey, grain size report and elevated-temperature mechanical testing can be added to the order.

INCONEL 602CA forged shapes we supply

All parts are made to drawing and there is no standard catalogue. Our open-die forging envelope covers diameters from 100 to 6000 mm, lengths from 100 to 12000 mm and piece weights from 10 to 15000 kg. Send a drawing and we will confirm your part against it.

• Seamless rolled ringsRolled on 3 m and 6 m ring mills
• Forged flangesWeld neck, blind, slip-on, spectacle, to ASME B16.5 / B16.47 or drawing
• Forged round barsSolid and hollow bored, lengths to 12000 mm
• Forged discs and disksSolid discs and contoured blanks
• Forged sleeves and bushingsBored and honed to drawing
• Forged shafts and spindlesStepped, eccentric and hollow-bored shafts
• Forged tube sheetsDrilled and undrilled blanks for heat exchangers
• Forged nozzles and blocksValve bodies, seat rings, stems, hollow blocks

Forging equipment: 1, 3, 6 and 9 tonne open-die forging hammers, a 4500 tonne hydraulic press, and 3 metre and 6 metre seamless ring rolling mills. The works employs 460 people, including 9 senior engineers and 32 intermediate engineers.

Where is INCONEL 602CA used?

INCONEL 602CA is specified where a component has to survive high temperature and an aggressive atmosphere at the same time, conditions that shorten the life of stainless steels and of lower-alloy nickel grades.

Heat treatment and industrial furnaces

Radiant tubes, muffles, retorts, roller hearth and pusher furnace rollers, charge carriers, baskets, grids, fans and furnace fixtures. This is the largest single application for the alloy. Because it resists internal oxidation, a thin section keeps sound metal through the full wall thickness and holds its properties after several hundred cycles.

Petrochemical, hydrogen and syngas

Catalyst grid supports, reformer internals, hydrogen production equipment, cracking furnace components, calciner parts and process modules working in carburising or metal-dusting conditions. Forged rings, tube sheets, flanges and nozzles in 602CA are common in this service.

Waste to energy, incineration and cement

Incinerator grate bars and internals, gasifier components, calciner rings, kiln and cooler fixtures, and thermal processing equipment exposed to alkali, chloride and sulphur-bearing flue gas.

Power generation and heavy equipment

High-temperature ducting, hot-gas expander and turbine ancillaries, burner components, and forged shafts, sleeves and bushings for equipment running above the reach of stainless steel. Diesel glow plugs and high-temperature exhaust components use the same alloy in wrought form.

Silicon, ceramics and thermal processing

Fixtures and support structures in silicon and silicon carbide production, ceramic sintering, and other processes that combine long dwell times above 1100 °C with oxidising atmospheres.

INCONEL 602CA compared with other heat-resistant nickel alloys

Buyers most often ask whether 602CA justifies its cost against Inconel 601 or Incoloy 800H. Metal temperature and atmosphere decide it.

The comparison is indicative and based on nominal published chemistries. It does not replace a design calculation. Send us the metal temperature, atmosphere and required life and we will say whether a lower-cost grade will do the job.