45 steel, quenched and tempered

45 Steel Q&T Ground Round Bar

Quenched-and-tempered ground bar for orders that need balanced mechanical properties and room for downstream machining.

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45 Steel Q&T Ground Round Bar — 45 steel, quenched and tempered

45 Steel Q&T Ground Round Bar view 1 — Primary view

45 Steel Q&T Ground Round Bar view 2 — Angle view

45 Steel Q&T Ground Round Bar view 3 — Surface and end-face detail

SPECIFICATIONS

45 Steel Q&T Ground Round Bar: standard specification

Standard specification. Other sizes, tolerances and chrome layers are quoted against your drawing.

Grade	Grade 45 to GB/T 699-2015 · comparable, for reference only: C45, S45C, SAE 1045
Diameter	Ø8–140 mm (Q&T from Ø8)
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 HRC25–28
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

TYPICAL APPLICATIONS

Loaded shaft components; Mechanical transmission parts; Stock for precision machining.

SELECTION NOTE

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.

45 steel Q&T ground round bar

01Cold drawing (≤Ø28) / peeling (Ø30+)
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

01-0.02 to -0.05 mmcommon tolerance

020 to -0.02 mmoptional tolerance

03HRC25–2845 steel Q&T hardness

Standard values for 45 steel Q&T ground bar. Final values are fixed on the confirmed drawing, specification and order.

TECHNICAL GUIDES

Technical topics to review before ordering

01How to write a shaft RFQ: diameter, material, inspection and packing 02Shaft tolerance and fit: why “h6” or “high precision” is not enough 03Ra, straightness and cylindricity are different shaft requirements

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 45 Steel 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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