“The seamless rolled rings for our 4 MW main bearing passed every BIS tensile test on the first run. No rework needed.”
Ram Shankar
Senior Engineer, Turbine Components
Feedback from wind turbine and heavy equipment manufacturers after tensile validation and field use.
“The seamless rolled rings for our 4 MW main bearing passed every BIS tensile test on the first run. No rework needed.”
“We replaced a competitor’s slewing bearing with your forged ring assembly. Downtime dropped by 30% in the first quarter.”
“Your large-diameter forged rings for our reactor flanges met ASME Section VIII requirements without any dimensional deviation.”
“After 18 months of cyclic loading, the ring showed zero crack initiation. The grain flow from forging is clearly superior.”
“The integrated gear teeth on your slewing bearing matched our CAD model exactly. Installation took half the usual time.”
Each ring batch undergoes controlled tensile tests on a 600 kN universal testing machine. We record yield point, ultimate tensile strength, and percentage elongation to validate conformance with IS 2004 and IS 2062 standards.
Reduces field failure risk by confirming material behavior at rated load.Our radial-axial rolling process eliminates weld seams and produces continuous grain flow. Rings for wind turbine main bearings are ultrasonically inspected after rolling to detect any internal discontinuities.
Extends service life in cyclic-load applications like rotor hubs.Slewing rings for excavators and cranes are load-tested at 1.5× rated capacity. We verify raceway hardness, gear tooth strength, and axial runout using CMM and Brinell hardness testers.
Ensures smooth rotation under combined axial, radial, and moment loads.Forged rings for pressure vessel flanges are machined to within ±0.5 mm on diameter and ±0.2 mm on flatness. Each piece is checked with laser profilometry and supplied with a dimensional report.
Eliminates rework during vessel assembly and hydrotesting.Our engineering team follows a structured process to ensure every forged ring meets BIS tensile stress specifications and dimensional tolerances.
You submit the required outer diameter, wall thickness, and material grade (carbon, alloy, or stainless steel). Our engineers verify the load envelope for the intended wind turbine or pressure vessel application.
We source certified steel billets with full mill test certificates. Each heat is logged against your order to maintain complete traceability through forging, heat treatment, and final inspection.
The billet is upset, pierced, and rolled on our radial‑axial ring mill to achieve the specified diameter and cross‑section. Normalizing and tempering cycles are applied to refine grain structure and meet hardness targets.
Coupons from each ring are tested on a universal testing machine. We validate yield strength, ultimate tensile strength, and elongation per BIS specifications. Results are documented in a certified test report.
Rings are machined to your drawing tolerances on vertical boring mills. Every diameter, concentricity, and surface finish is recorded. We also perform ultrasonic inspection for internal soundness.
Each ring is cleaned, rust‑protected, and packed on steel skids or in wooden crates. We coordinate logistics for domestic or export shipment, providing a packing list and certificate of conformance with the consignment.
Definitions and scope
All seamless rolled rings and slewing bearings we manufacture are tested against the latest BIS standards for tensile strength, yield point, and elongation. A test certificate is issued per batch, and you can request a third-party audit at the factory before dispatch.
Yes, but the exact values depend on the steel grade and heat treatment selected. For rings above 4 meters in diameter, we apply additional ultrasonic inspection to confirm internal soundness. The tensile test results are reported on the material test report (MTR) that accompanies each shipment.
Standard concentricity tolerance is ±2 mm for diameters up to 3 m and ±3 mm for diameters up to 6 m. Tighter tolerances are possible with an additional machining pass. All dimensions are measured at room temperature after final heat treatment.
Absolutely. We supply plain forged rings for main bearing housings as well as rings with integrated gear teeth for slewing drives. The gear teeth are cut after forging and heat treatment, and we can match your existing tooth profile or design a new one.
We perform static and dynamic load calculations based on the actual raceway hardness and material properties. A prototype is then tested on our in-house test rig under axial, radial, and moment loads. The test protocol follows ISO 76 and ISO 281 methods adapted for large-diameter bearings.