Heavy-duty hydraulic and moving components; Guidance and transmission parts under shock loads; Custom chrome shafts requiring a 42CrMo base.
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42CrMo, quenched and tempered
42CrMo Q&T Chrome-Plated Bar
A 42CrMo alloy-steel quenched-and-tempered base (HRC30–38) with a hard-chrome surface, for chrome shafts under heavy or shock loads.
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SPECIFICATIONS
42CrMo Q&T Chrome-Plated Bar: standard specification
Standard specification. Other sizes, tolerances and chrome layers are quoted against your drawing.
| Grade | 42CrMo to GB/T 3077-2015 · comparable, for reference only: 42CrMo4, SCM440 |
|---|---|
| Diameter | Ø8–100 mm, made to order (from 1 t, 7–10 days) |
| Tolerance | Ø8–11: −0.02/−0.05 mm · from Ø12: 0/−0.02, −0.01/−0.03 or −0.02/−0.05 mm |
| Hardness | Q&T hardness HRC30–38 |
| 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.
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 42CrMo 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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