Automotive Stamping Steel Strip

Automotive Requirements for Steel Strip

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.

Steel Strip Supply for Stamping and Fineblanking Buyers

Hengtaifeng supplies and processes steel strip from sourced mill feedstock. This page concerns the material supplied to component manufacturers; it is not an offer to manufacture finished stamped parts or supply presses and dies. Material grade, condition, dimensions and acceptance criteria are reviewed together before an order-specific quotation.

What Must Be Agreed for Fineblanking Strip?

A grade name alone does not establish suitability for fineblanking. Provide the part drawing and material specification, the intended forming route and the required strip characteristics. Where the application needs a particular microstructure or mechanical-property window, define its measurement and acceptance criteria rather than assuming a universal limit.

Review item	Buyer input	Confirmation needed
Material and condition	Grade, standard edition, approved alternatives, annealed or other delivery condition	Grade-specific processing feasibility; no automatic cross-standard substitution
Properties and structure	Required hardness, tensile properties or microstructure limits, with test methods	Agreed sampling, test scope and acceptance criteria; no universal spheroidization guarantee
Strip geometry and edge	Thickness, width, tolerances, camber, flatness, burr limit and edge direction	Compatible material/size/condition combination and inspection method
Feeding and handling	Coil ID, maximum OD and weight, winding and packaging requirements	Coil format and handling constraints before production
Component qualification	Drawing revision, critical part features, subsequent treatment and any trial/approval requirements	Separate strip acceptance from validation of the customer's tooling and finished part

See the fineblanking RFQ supplement for a request template and supplier verification and inspection guidance for the evidence to agree. Submit only drawings and specifications you are authorized to share.

Grade Selection by Component Type

Listed grades and applications are starting points for review, not approved substitutions or finished-part performance guarantees.

Grade	Cross-standard references, not automatic substitutes	After Heat Treatment	Component Type	Why This Grade
16MnCr5	AISI 5115 / SCr415	Surface Hardness to be agreed, Core Hardness to be agreed	Gears, pinions, camshaft parts	Case-hardening grade. Carburize to get hard wear surface + tough core for impact loads.
42CrMo (SCM440)	AISI 4140	Hardness to be agreed (Q&T)	Transmission shafts, connecting rods, high-strength fasteners	Selected where an agreed combination of strength and toughness is required.
51CrV4	AISI 6150 / SUP10	Hardness to be agreed	Valve springs, clutch diaphragms, stabilizer bars	Vanadium-alloyed spring steel for fatigue-sensitive components.
GCr15	52100 / SUJ2 / 100Cr6	Hardness to be agreed	Bearing races, needle cups, thrust washers	High-carbon chromium grade used for rolling-contact components.
30CrMo	AISI 4130 / SCM430	Hardness to be agreed (Q&T)	Structural brackets, bolts, suspension links	Alloy steel option for applications requiring an agreed strength and heat-treatment condition.
C75S	AISI 1075 / SK6	Hardness to be agreed	Seat springs, retaining clips, flat springs	Spring steel candidate; confirm the governing standard and approved delivery condition.

Progressive Die Stamping Requirements

Define strip requirements against the actual press, feeder and tooling. The following are RFQ fields, not blanket supply guarantees:

Parameter	Requirement to Agree	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	Specify limit, specimen size and method	Review the shape requirement with the feed and blanking process.
Camber	Specify maximum deviation and gauge length	Validate tracking in the actual feeder.
Burr Height	Specify limit, direction and inspection method	Review edge requirements against handling, tooling and the finished part.
Coil Set	Specify measurement setup and acceptance limit	Confirm compatibility with the customer's straightening and feeding equipment.

Case Hardening Grades (16MnCr5, 20MnCr5)

For component designs specifying case-hardening grades such as 16MnCr5, review the forming and subsequent heat-treatment route together:

Strip state before stamping: Specify the required annealed condition, hardness or microstructure and validate it against the intended fine-blanking process.
Subsequent carburizing: Define the finished-part case depth, surface and core properties, distortion limits and test methods. The heat-treatment cycle must be developed for the actual component; this page does not prescribe a universal temperature or duration.
Critical for gears: The surface hardness provides wear resistance on tooth flanks. The tough core prevents tooth root fracture under shock loads. This combination is why case-hardening steels dominate automotive gearing.

Traceability and Document Requirements

State which of the following items are mandatory so availability, source and scope can be confirmed before ordering:

Inspection Certificate

Material test documentation can include agreed chemical, mechanical and metallographic results. Confirm the required inspection-document type and test scope at enquiry.

Heat Number Traceability

Define the required link between source heat, processing records and finished coil, together with the identifiers that must appear on documents and labels.

Process Control Documentation

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.

Typical Automotive Components

Transmission Gears

For gear and synchronizer components, submit the drawing, governing material specification and forming route. Confirm grade, thickness and subsequent heat treatment during engineering review.

Clutch Plates

For friction plate carriers and separator plates, specify the approved grade, thickness variation and flatness requirement together with the inspection area and method.

Spring Components

Diaphragm springs (51CrV4), Belleville washers, wave springs, retaining clips. Select delivery condition according to the forming sequence and finished-component validation plan.

Bearing Cages & Races

Stamped needle bearing cups, thrust washer races from GCr15. Agree strip consistency requirements and validate press settings through production trials.

Why Automotive Stampers Choose Hengtaifeng

Source requirements: Name an approved mill or source only when the drawing or purchase specification requires it.
Microstructure: Define the inspection method and acceptance criteria needed for the forming route.
Dimensional control: State tolerances, measurement method and sampling plan.
Traceability: State the required certificate type, heat-number link and process records.
Technical support: Grade recommendation based on your component design, heat treatment path, and performance requirements

Developing a new automotive component from strip?
Send the part drawing, governing specification, target properties, annual volume and required approval documents. We will review the material candidates and confirm feasibility and quotation scope.

Request Automotive Steel Quote