Route Decision
Choose the 42CrMo4 / 4140 route by part duty, condition, and inspection scope
Treat 42CrMo4 / 4140 as a buyer route decision: confirm the controlling standard, QT or other delivery condition, surface route, machining allowance, inspection documents, and final part duty with the inquiry.
- Control the standard name first, then list allowed equivalents such as SCM440 or 42CrMo
- Review QT, black, peeled, machined, or surface-prepared supply as separate routes
- Match shafts, hydraulic rods, flanges, and heavy-duty parts to load and inspection needs
- Send MTC, UT, surface, dimensional, packing, destination, and drawing requirements when relevant
Standards
42CrMo4, 4140, SCM440, and 42CrMo cross-reference grades
Use the required project standard first, then list acceptable cross-reference grades so chemistry, QT condition, mechanical properties, and inspection expectations are aligned for supplier review.
- EN 1.7225 / 42CrMo4
- ASTM 4140
- JIS SCM440
- GB 42CrMo
Delivery Route
QT condition, surface condition, and processing route for 42CrMo4 / 4140
Buyers should state whether the order is reviewed as black bar, peeled bar, machined bar, QT supply, or a downstream route involving rough machining, grinding, or surface treatment.
- Quenched and tempered condition
- Black / peeled / machined surface route
- Rough machining or semi-finished preparation
- Surface treatment reviewed by application
Application Fit
42CrMo4 / 4140 applications for rods, shafts, flanges, and heavy-duty parts
42CrMo4 / 4140 is commonly reviewed when a part needs strength, toughness, fatigue resistance, and practical heat-treatment response for hydraulic, rotating, or load-bearing service.
- Hydraulic cylinder rods and piston rods
- Wind power shafts and flanges
- Marine drive shafts and coupling parts
- Heavy-duty gears, spindles, and mechanical shafts
Inspection / RFQ
Inspection and RFQ details for 42CrMo4 / 4140 round bar
Before quotation, state diameter, length, quantity, QT condition, surface route, application, MTC requirement, heat number traceability, UT or third-party inspection needs, packing, and destination.
- Chemical composition and mechanical testing
- MTC and heat number traceability
- UT or third-party inspection if specified
- Packing, marking, destination, and drawings when available
