Q&T bar
Strength and toughness defined in the delivery condition
Q&T bar is quenched and tempered material. Beyond the grade designation, we review the required hardness, mechanical properties and machining conditions as part of the supply specification.
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Product & application
Q&T results depend on grade, section size and treatment conditions. Review items include hardness and test location, any tensile or impact testing, straightness and residual-stress requirements. Additional machining or heat treatment should be considered in the complete process route.
- Supply forms
- Q&T round bar · peeled/drawn finish by agreement
- Application examples
- Drive shafts, high-strength machine parts, shafts and fastener stock
Define the supply conditions.
These are specification inputs for quotation review. Actual availability, minimum quantity and lead time are confirmed by grade and size.
- Condition & surface
- Q&T condition, hardness range and test location, mechanical properties
- Dimensions & order
- Section dimensions, straightness and downstream machining allowance
- Inspection & documents
- Specify mill certificates, tests, traceability and customer approvals. Document availability, cost and timing are reviewed.
Representative grades & review scope
| Family | Representative grades / review basis |
|---|---|
| Carbon steel | S45C · S50C |
| Alloy steel | SCM435 · SCM440 |
| Other grades | Sourcing reviewed through domestic and overseas makers, based on the required standard and chemistry |
Grades and forms are inquiry examples. Inventory, availability, dimensions, quantity, inspections and lead time are confirmed at quotation.
JIS names are used as a reference. They do not automatically establish equivalence to other standards or certification. Agree the applicable standard, edition and product requirements before ordering.
Information for quotation & technical review
- Grade, section size and delivery condition
- Hardness range and measurement position
- Tensile, yield, elongation and impact test requirements
- Straightness and downstream machining
- Inspection documents and lot identification
If your drawing or specification is not complete, tell us the intended process and function. We can start by clarifying the information needed for review.