Hastelloy C-276 is a Ni Mo CR superalloy added with tungsten, which has excellent corrosion resistance in a wide range of harsh environments. The high content of Ni and Mo makes the Ni steel alloy particularly resistant to pitting and crevice corrosion in reducing environment, while CR transfers the performance of anti-oxidation medium. Low carbon content can reduce the precipitation of carbides in the welding process, so as to maintain the corrosion resistance of the welding structure. This nickel alloy is resistant to the formation of grain boundary precipitation in the HAZ, so it is suitable for most chemical process applications under welding conditions.
Forging of Hastelloy C-276
The alloy is forged between 2250/1750ºF (1230/955ºC) following a soak at forging temperature of 30 minutes per inch of billet or ingot section thickness. Forging should be started immediately the stock is removed from the reheat furnace and 25/40% reductions help to retain as much internal heat as possible. For optimum corrosion resistance, forged parts should be subsequently annealed. See Heat Treatment.
The alloy is normally supplied in the solution-annealed condition. This treatment is carried out at 2050ºF (1120ºC) followed by water quench or rapid air cool. The treatment is performed after hot working to ensure optimum corrosion resistance and between cold- working operations.
Machinability of Hastelloy C-276
The alloy is considered moderate to difficult to machine, but can be machined using conventional methods. The alloy has a high work hardening rate, and efficient machining requires rigid and overpowered machines, sharp tools, preferably carbide-tipped, and heavy, constant feeds.
Weldability of Hastelloy C-276
The alloy welds in a similar manner to C-22 alloy. Gas-tungsten-arc welding (GTAW) and shielded-metal-arc welding (SMAW) are commonly used to weld C-276 alloy.
It is recommended that the alloy be in the solution-annealed condition for welding, and that C-276 filler metal be used.
Submerged-arc-welding is not recommended for this alloy as there is high heat input with this method and slow cooling of the weld. Neither is Oxyacetylene welding recommended, due to the danger of carbon pickup in the weld.
Hastelloy C-276 Forgings Equivalent Standard
Chemical Composition – Alloy C276 (Hastelloy C276/UNS N10276)
Typical problems associated with metal rings can frequently be traced to the metal-forming process. Cast rings are often plagued with substandard strength and integrity. Rolled and welded or cut rings out from plate are susceptible to fatigue and carry excess material and processing costs. The forging process produces rings with controlled grain flow, which gives strength and resistance to impact and fatigue not found in rings torch cut from plate or rolled and welded.
Forged Ring Advantages
Achieving structural integrity
Enabling size versatility
Weights up to 60,000 lbs. in both ferrous and non-ferrous materials. The forging process produces rings with controlled grain flow, which gives strength and resistance to impact and fatigue not found in rings torch cut from plate, or rolled and welded.
Production technology of forged ring
When forged rings are manufactured, open die processing procedures are implemented so that workers can make seamless rolled rings. The unique rolling method makes each ring have better concentricity and flatness. All forged rings can withstand strict tolerances and meet typical industrial requirements. Mandrel rings are manufactured for customers who need heavier rings or fewer supply rings. Mill is used when seamless forged rings are manufactured in the manufacturing plant. Due to the different design size of the rolling mill, the outer diameter of each ring will be different. The smallest ring usually weighs about 300 pounds, and the largest ring usually weighs more than 300000 pounds.
Production process of forged rings
In the first stage, a round metal material is transformed into a hollow doughnut. The staff heated the doughnut until the surface crystallized. The metal is then placed on the mandrel or idler. Next, under strong pressure, the roller moves to the drive roller. It reduces the wall thickness by continuously rotating. Many manufacturers can make seamless rings in a variety of configurations. Most enterprises require flat rings, cylindrical rings and rings that look like washers. The height of each ring is also different; The product can be made one inch high or more than nine feet high. However, the height to thickness ratio is usually between 1:16 And 16:1. If the customer needs several rings with large proportion, special treatment is needed. In general, rectangular rings are the most common, because their design is simple.
Step 1: Smelt and Pour liquid steel to make steel ingot;
Step 2: Heat steel ingot and blank to produce steel bar;
Step 3: Cut steel bar to get billet by cutting machine;
Step 4: Upset by power press/forging hammer to get round cake;
Step 5: Punch and pierce to make blank by forging equipment;
Step 6; Ring rolling by ring rolling machine;
Step 7: Make heat treatment and machining.
Yaang Tailored Solutions
Small or large quantities of open die or rolled rings
Up to 252″ maximum O.D.
Up to 49″ maximum face height
Rolled ring weights to 60,000 lbs., open die weights to 300,000 lbs.
Downstream processing such as heat treat, testing, machining, segmenting, parting or splitting can all be performed in house.
Yaang Forge Difference
At Yaang, we know the importance of getting your parts on-time, as expected. However, for customers new to procuring forgings, ordering a forging that will meet all specifications for end-use applications may be a challenge, which is why finding a trusted supplier and partner is essential. Our employee-owners are here to ensure your project stays on track with our forgings by offering:
Forge Design & Engineering Guidance
Finished Machining Options
Metallurgical Review, NDE & Destructive Testing
We offer many size forgings in both standard and unique geometries to meet your needs.
Step Shafts, Eccentric Shafts & Rotor Shafts
Hubs & Tooled Forgings
Forged & Rolled Rings
Discs & Blanks
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