Cold Drawn Flat Steel Blanks for Flywheel and Starter Ring Gears
Short Answer for Ring-Gear Material Buyers
Junxiong Metal reviews drawing-based cold drawn flat steel blanks for automotive flywheel and starter ring-gear manufacturing. Quotation requires the exact ordered grade and standard, flat width and thickness, edge condition, forming route, tooth-making process, heat-treatment target, weldability requirement, inspection scope, quantity and destination.
This page covers steel input material and pre-machining blanks. Junxiong is not presenting a finished starter ring gear, flywheel assembly or replacement auto part.
Send the ring-gear blank drawing and annual demand or send the specification by WhatsApp.
Supply Scope and Evidence Boundary
Junxiong has confirmed a commercial route for buyer-specified 35K cold drawn flat steel used in ring-gear production. Public technical examples also show S35C, S45C, C35 and C45 routes for selected flywheel or starter-ring designs. These are separate sourcing routes, not universal substitutes.
Evidence boundary: customer identities are confidential. This page does not claim that SWRCH35K wire-rod terminology is a flat-bar specification, does not claim that every ring gear uses 35K, and does not publish a heat-specific batch certificate. Final acceptance depends on the approved drawing, ordered standard, matching heat identity, MTC and agreed inspection results.
Cold Drawn Steel to Ring-Gear Application Route
Supply boundary: the toothed ring shows the intended downstream application only. Quotations remain controlled by the buyer’s steel specification, blank drawing, forming and joining route, machining allowance, heat-treatment requirements and matching batch evidence.
Grade Routes Must Stay Separate
| Buyer route | Safe procurement treatment | Required confirmation |
|---|---|---|
| 35K cold drawn flat steel | Customer/order-specific Junxiong supply route. | Exact grade document, chemistry, flat dimensions, delivery condition, forming route and matching batch evidence. |
| S35C | Japanese medium-carbon route appearing in public flywheel/ring-gear examples. | Exact JIS or customer standard, product form, heat treatment, hardness and weldability. |
| C35 | Separate European designation route. | Exact EN/customer specification and written approval; do not relabel as S35C or SAE 1035. |
| SAE 1035 | Separate North American chemistry route for buyer review. | Applicable SAE/ASTM product standard, condition, dimensions, properties and MTC scope. |
| S45C | Japanese higher-carbon route appearing in a public flywheel gear-band example. | Exact standard, joining route, hardening method and finished-component validation. |
| C45 | Separate European medium-carbon route. | Exact EN/customer specification; hardness and weldability trade-off must be reviewed. |
| SAE 1045 | Separate North American route for buyer review. | Applicable SAE/ASTM product standard and written substitution approval where relevant. |
Technical Facts Needed for a Quotation
| Decision | Buyer information required |
|---|---|
| Drawing and geometry | Blank and finished-ring drawings, outside and inside dimensions, tooth zone, datums and machining allowance. |
| Material | Exact grade, governing standard and edition, chemistry limits, delivery condition and any hardenability requirement. |
| Flat blank | Width, thickness, tolerance, flatness, straightness, edge/corner condition, length or coil route and surface limits. |
| Forming and teeth | Ring rolling, bending, butt joining, tooth cutting or forming route and process allowance. |
| Heat treatment | Induction hardening, through hardening or carburizing plan, surface hardness, effective case depth and core criteria. |
| Joining | Welding or other joining method, preheat/postheat plan and weldability criteria. |
| Quality | MTC fields, heat traceability, mechanical tests, hardness, decarburization, NDT, PPAP and third-party inspection. |
| Commercial | Trial quantity, annual demand by model, packing, destination, schedule and Incoterm. |
Why a Finished Ring-Gear Search Is Not a Steel RFQ
Google Keyword Planner reports meaningful searches for starter ring gear and flywheel ring gear, but those searches normally describe a finished automotive component. Junxiong supplies upstream steel material. A qualified enquiry should therefore include the steel blank drawing, grade route, annual volume and process requirements rather than only a vehicle model or replacement-part number.
Buyer Checklist
- Exact grade designation, standard and standard edition.
- Flat-steel width, thickness, tolerances, edge condition and delivery length.
- Finished ring drawing and required machining/forming allowance.
- Tooth-making, joining and heat-treatment sequence.
- Surface hardness, case depth, core properties and distortion limits.
- MTC, PPAP, heat traceability and inspection requirements.
- Trial quantity, annual demand, destination and delivery schedule.
FAQ
Is 35K the universal steel for flywheel ring gears?
No. It is a buyer/order-specific route supplied by Junxiong. Public designs also use other medium-carbon routes, and the exact drawing and standard control the decision.
Is SWRCH35K automatically a cold drawn flat-bar grade?
No. SWRCH35K is associated with JIS cold-heading wire-rod terminology. A flat-steel order needs its own agreed product specification and cannot be created by changing the product-form name.
Are S35C, C35 and SAE 1035 identical?
No. They are regional candidate routes. Chemistry, governing documents, permissible variation, condition and product requirements must be compared before any substitution.
Can Junxiong quote a finished ring gear?
This page is for cold drawn flat steel and pre-machining material blanks. Send the drawing if you need the factory to confirm the exact supply boundary.
What evidence proves a delivered batch?
The approved order, heat identity, matching MTC and agreed inspection records prove the batch. A representative photograph or public patent does not.
Primary Technical References
- Aisin flywheel/ring-gear example using S35C
- Drive-plate/ring-gear example using S35C
- Flywheel gear-band example using S45C
- Starter-ring-gear discussion covering C35/C45 trade-offs
Reference boundary: patent examples show possible designs and process routes. They do not establish a universal grade, a Junxiong batch or automatic equivalence.
Related Pages
Send the complete ring-gear steel blank RFQ for factory review.