Close view of long round steel bars in industrial storage

Grade route 04

34CrNiMo6round bar

Well suited to large shafts, gear shafts, and heavy machinery.

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Multiple bundles of long round steel bars inside a warehouse — Material focusReviewed for high load-bearing requirements when toughness, fatigue resistance, and application conditions are specified.

Grade specifications

Confirm the grade and condition before comparing prices.

Cross-references are a starting point. The drawing standard, condition, size and inspection scope define the order.

01Grade34CrNiMo6
02StandardConfirm standard and edition
03ConditionQT
04PartShafts & pins
05ReleaseChemical analysis

Standard map

Common cross-references

EN: 34CrNiMo6 / 1.6582
UK / South Africa buyer terminology: 817M40 / EN24 round bar — verify the specified BS 970 edition, condition, chemistry, properties, and substitution approval
SAE: SAE 4340; confirm the controlling product standard
GB: 34CrNiMo6

Supply window

Published specification

Diameter: 20 - 400 mm
Length: 3 - 12 m
Condition: QT

Property reference

Mechanical route

Property route: State the product standard, QT class or target, diameter, and required results
Test basis: State the test position, sampling plan, and required result document

Chemistry reference

34CrNiMo6: Use the chemistry table in the named ISO or EN product standard
SAE 4340: Use SAE J404 for the chemical designation
Substitution check: Compare both routes before the buyer approves a change

Matched components

Connect the material to the part.

Open matched process route Prepare grade RFQ →

Application and release

Key details for your order.

01 / Typical use

Heavy duty shafts
Gear shafts
Oil & gas equipment
Mining machinery components

02 / Inspection scope

Chemical analysis
Mechanical testing
UT inspection
Dimensional review

RFQ checks

Questions buyers ask first.

Is 34CrNiMo6 the same as AISI 4340?

34CrNiMo6 and AISI 4340 are commonly reviewed as related Ni-Cr-Mo alloy steel routes, but buyers should specify the required standard first. Chemistry, condition, mechanical properties, and inspection requirements need order-specific review.

Why do 34CrNiMo6 buyers often mention UT inspection?

Heavy-duty shaft and load-bearing applications may require internal soundness review. If UT is required, the buyer should state the standard, acceptance criteria, report requirement, inspection timing, and third-party witness needs if applicable.

What delivery condition should be discussed for 34CrNiMo6?

34CrNiMo6 is commonly reviewed with QT condition for demanding parts, but the RFQ should state the required delivery condition, mechanical-property target, section size, machining allowance, surface route, and document requirements.

Technical references

Go deeper only where needed.

Shaft bar applicationsConnect 34CrNiMo6 grade review to shaft duty, size, machining route, and inspection needs.Wind, marine, and heavy machineryReview heavy-duty application routes where toughness, fatigue, packing, and documentation matter.Processing routesReview heat treatment, peeling, grinding, machining, straightening, and preparation routes before RFQ.

Grade RFQConfirm the standard before quotation.

Send the grade standard, size, quantity, condition, application, inspection documents and destination.

Send a Specification