Forging / Alloy Steel Forgings

Alloy Steel Forging Grades & Properties

Alloy steel forgings combine high strength with deep hardenability and elevated-temperature performance. Monmet supplies 4130/4140/4150, 4330/4340/4350 and 8620/8630/8640/8650/8660 alloy grades for shafts, valves, gear blanks and pressure components.

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Grades & Applications

4140 / 4340 for shafts, gears and structural forgings; 8620-series case-hardening grades for gearing; other low-alloy compositions for high-temperature and elevated-pressure service are supplied to the grade named on your drawing.

Heat Treatment

Quench-and-temper cycles tuned per heat lot for the required strength and toughness; sub-critical anneal for hydrogen-charged service.

Inspection

Inspection and testing to the scope and acceptance criteria stated on your drawing or purchase order.

Frequently Asked Questions

Send the operating temperature, pressure and any hydrogen exposure and we recommend a grade to the specification your drawing or purchase order calls for.

Yes — 4340's deep hardenability supports through-hardening on heavy sections with the correct quench medium and section size for the target properties.

Related Forging Capabilities

Open-Die Forging

Open-die forged shafts, blocks, discs and cylinders in a wide range of tonnages, in carbon, alloy and stainless steels. Continuous grain flow; testing to your drawing.

Forged Shafts

Open-die forged shafts in a wide range of tonnages for hydroelectric, steam turbine, generator rotor, marine and heavy mill applications.

Stainless Steel Forgings

Stainless steel forgings in austenitic, martensitic, duplex and precipitation-hardening grades. Corrosion-resistant for chemical, marine, food and pharma service.

Carbon Steel Forgings

Carbon steel forgings in standard piping, vessel and general-purpose grades. Weldable, machinable and cost-effective for piping, pressure and structural applications.

Next steps

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Open-die, closed-die and large-diameter seamless rolled rings — request a quote.

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Sand, investment, centrifugal & continuous casting.

Industries Served →

Mining, cement, energy, pulp & paper and more.

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Talk to our specialists and find other ways of forming and shaping metal. There are options aside from casting and forging, such as metal spinning, extrusion and drawn metals.

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