40Cr
40Cr is a widely used alloy structural steel with good hardenability and strength after heat treatment.
Standards
Use the required standard first, then list any acceptable equivalent grade names so the alloy structural steel route, delivery condition, and inspection language are clear with the request.
Delivery Route
40Cr buyers should state whether the route is hot rolled, forged, annealed, normalized, QT, rough machined, or finish machined, because condition and processing affect the final part review.
Application Fit
40Cr is commonly reviewed for mechanical parts that need balanced strength, hardenability, and practical machining, especially where the part does not require a higher Cr-Mo route.
Inspection / RFQ
Before quotation, state grade standard, diameter, length, quantity, heat-treatment target, machining route, application, MTC needs, dimensional inspection, packing, and destination.
Production route
Use this page as a starting point. Load the route, then adjust each selection to match your order.
Starting point only. The exact route depends on grade, dimensions, application, specification, and order requirements.
Buyer Questions
40Cr round bar is commonly reviewed for shafts, gears, bolts, transmission parts, automotive components, and general machinery parts where balanced alloy strength and heat-treatment response are important.
Compare 40Cr and 42CrMo when the part could fit either a balanced alloy structural steel route or a higher-load Cr-Mo route. Load, heat treatment, section size, toughness, and inspection requirements should guide the review.
A 40Cr RFQ should include grade standard, diameter, length, quantity, delivery condition, heat-treatment target if specified, machining route, application, inspection documents, packing requirements, and destination.
FAQ
40Cr, 41Cr4, and SCr440 are commonly reviewed as cross-reference grade names, but the required project standard should be stated first. Chemical, mechanical, delivery condition, and inspection details still need order-specific review.
The delivery condition depends on the part route and downstream process. Buyers should state whether they need annealed, normalized, QT, hot rolled, forged, or machined supply, plus any hardness or mechanical-property target.
Common inspection points include chemical composition, mechanical testing when specified, hardness target if required, dimensions, surface condition, MTC, traceability, and third-party inspection when the project requires it.
40Cr Buyer Details
Review common cross-reference grades, core mechanical data, diameter range, delivery condition, and common shaft, gear, bolt, and machinery uses.
Cross-reference grades must be confirmed against the required project standard before quotation.
40Cr RFQ
Include diameter, length, quantity, heat-treatment target, machining route, application, inspection needs, and destination.
