16MnCr5 · 42CrMo · 51CrV4 · GCr15 · 30CrMo · C75S — For Gears, Clutch Plates, Transmission Parts
Automotive component stamping combines tight dimensional control with high production volumes. Material consistency supports stable feeding and forming, but final part capability must be validated through the customer's tooling, process controls and inspection plan.
Automotive applications can impose traceability, quality-system and approval-document requirements. The buyer should state the required heat-number link, inspection certificate, PPAP scope and applicable supplier qualification before quotation; none should be assumed from the application name alone.
| Grade | Equivalent | After Heat Treatment | Component Type | Why This Grade |
|---|---|---|---|---|
| 16MnCr5 | AISI 5115 / SCr415 | Surface 58-62 HRC, Core 30-40 HRC | Gears, pinions, camshaft parts | Case-hardening grade. Carburize to get hard wear surface + tough core for impact loads. |
| 42CrMo (SCM440) | AISI 4140 | 28-34 HRC (Q&T) | Transmission shafts, connecting rods, high-strength fasteners | Selected where an agreed combination of strength and toughness is required. |
| 51CrV4 | AISI 6150 / SUP10 | 44-52 HRC | Valve springs, clutch diaphragms, stabilizer bars | Vanadium-alloyed spring steel for fatigue-sensitive components. |
| GCr15 | 52100 / SUJ2 / 100Cr6 | 60-65 HRC | Bearing races, needle cups, thrust washers | High-carbon chromium grade used for rolling-contact components. |
| 30CrMo | AISI 4130 / SCM430 | 25-32 HRC (Q&T) | Structural brackets, bolts, suspension links | Alloy steel option for applications requiring an agreed strength and heat-treatment condition. |
| C75S | AISI 1075 / SK6 | 42-50 HRC | Seat springs, retaining clips, flat springs | EN standard spring steel. Widely specified by European OEMs. |
Our strip is optimized for progressive die feeding. The critical parameters:
| Parameter | Our Specification | Impact on Stamping |
|---|---|---|
| Thickness Tolerance | Confirm per RFQ and measurement method | Must match the drawing and forming process. |
| Width Tolerance | Confirm per RFQ and edge condition | Must match the feed and tooling requirements. |
| Flatness | ≤5 I-units | No buckling in feed, consistent blank positioning for transfer dies. |
| Camber | ≤2mm per meter | Strip tracks straight through feeder. No progressive drift causing misfeed. |
| Burr Height | ≤5% of thickness | Clean slit edges prevent die wear and part defects from burr interference. |
| Coil Set | Leveled to ≤15mm radius | Lead end feeds without manual intervention. Enables lights-out running. |
Gears and pinions represent the highest-value automotive components produced from strip. Case-hardening grades like 16MnCr5 are designed to be carburized after forming:
State which of the following items are mandatory so availability, source and scope can be confirmed before ordering:
Material test documentation can include agreed chemical, mechanical and metallographic results. Confirm the required inspection-document type and test scope at enquiry.
Define the required link between source heat, processing records and finished coil, together with the identifiers that must appear on documents and labels.
Process and inspection records are retained according to applicable quality-system and customer-specific requirements. Audit access and retention periods should be agreed during supplier qualification.
Fine-blanked or stamped planetary gears, ring gears, synchronizer rings from 16MnCr5. Strip thickness 2.0-6.0mm for direct gear stamping.
Friction plate carriers and separator plates from 65Mn or C75S. Require precise flatness (≤0.05mm) and consistent thickness for clutch pack assembly.
Diaphragm springs (51CrV4), Belleville washers, wave springs, retaining clips. All benefit from our hardened and tempered delivery option.
Stamped needle bearing cups, thrust washer races from GCr15. Progressive die production at 80+ strokes/minute demands perfect strip consistency.
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