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40Cr, quenched and tempered
40Cr Q&T Chrome-Plated Bar
A 40Cr quenched-and-tempered base combined with a hard-chrome surface for shaft applications requiring both core properties and wear resistance.
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SPECIFICATIONS
40Cr Q&T Chrome-Plated 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 | Ø8–140 mm, made to order |
| 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 core HRC28–35 |
| Hard chrome | 20–30 μm per side, up to 50 μm on request |
| Surface roughness | Ra ≤ 0.4 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 you only need a wear-resistant chrome surface and not the strength and toughness of a Q&T core, a soft or induction-hardened chrome shaft may cost less.
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
- 06Hard chrome
- 07Final polishing
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
0220–30 μmchrome per side, to 50 μm
03HV800+chrome hardness capability
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 Chrome-Plated Bar
Send diameter, length, quantity or a drawing. We reply with grade, tolerance, chrome thickness and lead time.
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