Transmission-shaft stock; Round stock for machining; Shaft parts requiring a 40Cr base.
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40Cr, quenched and tempered
40Cr Q&T Ground Round Bar
Ground bar for shaft orders specifying 40Cr in a quenched-and-tempered condition, with dimensions and hardness agreed per order.
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SPECIFICATIONS
40Cr Q&T Ground Round Bar: standard specification
Standard specification. Other sizes, tolerances and chrome layers are quoted against your drawing.
| Grade | 40Cr to GB/T 3077-2015 · comparable, for reference only: 41Cr4, SCr440 |
|---|---|
| Diameter | Ø5–140 mm |
| Tolerance | Ø4–11: −0.02/−0.05 mm · from Ø12: 0/−0.02, −0.01/−0.03 or −0.02/−0.05 mm |
| Hardness | Q&T hardness HRC28–35 |
| Surface roughness | Ra ≤ 0.8 μm |
| Straightness | ≈ 0.1 mm/m from Ø25 · ≈ 0.2 mm/m below Ø25 |
| Length & cutting | Standard 1 m; CNC saw cut to length (≈ 3 mm allowance), ends left as sawn |
| Certificates & testing | Steel mill certificate for each heat, forwarded unaltered; foreign grades named here are for reference only; third-party test reports on request |
If the final working surface requires hard chrome, confirm whether to select a chrome-plated product or reserve the part for downstream surface treatment.
PROCESS ROUTE
How this bar is made
Dashed steps are done by long-term partner plants to Yixin's specification; all others run in the Yixin workshop.
- 01Centerless peeling
- 02Induction Q&T
- 03Roll straightening
- 04Centerless grinding
- 05Polishing
Yixin workshopLong-term partner plant, to Yixin's specificationAll products can be CNC-sawn to length
RELEVANT PROCESS CAPABILITY
Technical baselines relevant to this product route
010.02 mmtolerance band to drawing
Typical process capability. Final values for each size are fixed on the confirmed drawing, specification and order.
TECHNICAL GUIDES
Technical topics to review before ordering
SERVICE
Export terms
How standard orders are handled. Volume and special requirements are written into the quotation.
- Minimum order
- 1 t per order; 20–50 kg sample orders available
- Lead time
- Cut-to-length from stock 3–5 days · non-standard diameters 7–10 days · custom heat treatment 10–20 days, plus sea-freight booking
- Trade & payment
- FOB Shanghai or Ningbo · T/T
- Packing
- Protective film, steel-strapped bundles, wooden cases or pallets for sea freight
- Documents
- Commercial invoice, packing list and mill certificate; certificate of origin arranged per order; third-party inspection on request
- Response
- Quotation reply within one working day
Inquire about 40Cr Q&T Ground Round Bar
Send diameter, length, quantity or a drawing. We reply with grade, tolerance, chrome thickness and lead time.
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