Seamless Rolled Rings
Rolled rings for gears bearings flanges and tooling in alloy and stainless grades
What Seamless Rolled Rings Is and Who It Is For
Seamless rolled rings are forged and then rolled out to diameter, which gives a circumferential grain flow that a welded or plate cut ring never has. Tianhao supplies them as gear and bearing blanks, as rolled rings and discs for pumps and valves, as contoured rings for handling equipment and as rolled rings and blocks for tooling purposes.
Key Benefits
- Circumferential grain flow carries hoop stress better than a welded ring
- Contoured rolling reduces the stock the machine shop removes
- Ring, heat treatment and machining come from the same order
- Materials from 4140 and 42CrMo4 through to 304, 316 and nickel alloys
| Common gear grades | 42CrMo4, 34CrNiMo6, 18CrNiMo7-6, 30CrNiMo8 |
|---|---|
| Alloy steels | 4140, 4150, 4330, 4330V, 4340, 1045, 1080 |
| Pressure grades | ASTM A350 Grade LF2, ASTM A350 Grade LF6 |
| Stainless | 304 and 316 |
Who It Is For
- Gear and bearing manufacturers
- Pump and valve makers
- Tool and die shops
- Food equipment builders
Problems It Solves
- Welded rings crack at the weld under cyclic hoop load
- Burning a ring out of plate wastes most of the material
- Separate forging and machining suppliers argue over the finished dimension
Technical Features
- Seamless rolled construction
- Contoured profiles available to reduce machining
- Case or through hardening supported by grade selection
- Sizes suited to the 5-axis machining centre for finish work
Where Seamless Rolled Rings Is Used
Gear and bearing blanks for transmissions
Gear and bearing blanks for transmissions
Rolled rings and discs for pumps and valves
Rolled rings and discs for pumps and valves
Support rings for excavators
Support rings for excavators
Rolled rings and blocks for tooling purposes
Rolled rings and blocks for tooling purposes
Rings for pellet mills and centrifugal baskets in food equipment
Rings for pellet mills and centrifugal baskets in food equipment
Materials
- 42CrMo4
- 34CrNiMo6
- 18CrNiMo7-6
- 30CrNiMo8
- 4140
- 4340
- 304
- 316
Quality Control
- Dimensional check after rolling and again after heat treatment
- Testing included in the value added service package
- Material certificate for each heat
Customization Options
- Plain or contoured ring section
- Rough, semi machined or finish machined
- Case or through hardening grade selection
How We Make It
Billet preparation
Upsetting
Upsetting and piercing
Ring rolling
Heat treatment
Machining on the CNC centre
Testing
Testing and inspection
How It Compares
A rolled ring beats a plate cut ring on material yield and fatigue life, and beats a welded ring on integrity. For very small diameters a forged disc that is later bored can be more economical.
Use Guide
- Give the finished ring drawing and the machining allowance you want
- State whether the ring will be case or through hardened
- Confirm any ultrasonic or mechanical test requirement at enquiry stage
Often Ordered Together
Open Die Forgings
Rings discs blocks and shafts forged in carbon alloy tool and stainless steels
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Wind Power Gear Rings
Forged rings for wind turbine gears in case and through hardening grades
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Forged Flanges
Flanges rolled rings and discs for pumps valves wellheads and pressure equipment
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Questions Buyers Ask About Seamless Rolled Rings
Which grades do you use for gear rings?
42CrMo4, 34CrNiMo6, 18CrNiMo7-6 and 30CrNiMo8 are the usual choices for case or through hardening.
Can you supply contoured rings?
Yes, forged rings, contoured rings and discs are part of the standard programme.
Do you machine the rings as well?
Yes, machining is part of the one stop package with forging and heat treatment.
Get a Quote for Seamless Rolled Rings
Send the drawing, the quantity and the delivery condition you need. We reply with price, lead time and a sample plan.