4340 and 34CrNiMo6 Cold Drawn Steel Bars

Short Answer for 4340 and 34CrNiMo6 Bar Buyers

Junxiong Metal can review 4340 and 34CrNiMo6 cold drawn steel bar enquiries in round, square, flat, hexagonal and drawing-based sections. Buyers should state the governing standard, dimensions, tolerances, surface, delivery or heat-treatment condition, required properties, quantity, destination and MTC requirements.

4340, 34CrNiMo6, 1.6582 and EN24 are frequently searched together, but a search comparison is not an approval to substitute one specification for another. Chemistry, hardenability, section size, heat treatment and mechanical-property requirements must be checked against the purchase specification.

Send a complete 4340 or 34CrNiMo6 factory RFQ or send the grade, standard, shape, size, condition and quantity by WhatsApp.

Representative Cold Drawn Round Bar Images

Representative Junxiong cold drawn round steel bars for machining enquiries — Representative Junxiong round-bar form. This image does not identify a 4340, 34CrNiMo6 or EN24 heat.

Representative packed cold drawn round steel bars prepared for export — Representative export packing form. Grade, heat-treatment condition and conformity require the approved order and batch documents.

Image boundary: steel grade and heat-treatment condition cannot be verified from appearance. These Junxiong images show relevant round-bar and packing forms only and are not presented as 4340, 34CrNiMo6 or EN24 batch evidence.

Supply Scope and Evidence Boundary

Junxiong has confirmed commercial supply capability for this grade family. A quotation does not imply every size or strength condition is available. True grade-specific photos and order or batch evidence remain required before paid promotion.

Evidence boundary: a supply statement or quotation is not a shipment record, current-stock declaration, heat certificate or dimensional inspection report. Each order is confirmed against the approved specification, production route and order or batch documents.

Technical Facts Buyers Must Confirm

Decision	Required RFQ information
Grade route	SAE/AISI 4340, 34CrNiMo6, 1.6582, EN24 or another buyer-approved standard and edition.
Heat-treatment condition	State the exact as-supplied condition and the required property or hardness range; do not order by alias alone.
Section effect	Finished section size and any later heat treatment must be supplied because property response can vary with section and process.
Dimensions	Finished size, tolerance, corner radius where applicable, straightness, twist and length tolerance.
Inspection	Heat identity, MTC type, chemistry, mechanical properties, hardness, hardenability or additional inspection requirements.
Commercial data	Quantity per size, repeat demand, packing, destination country, port and required delivery schedule.

Shape and RFQ Selection

Shape	Buyer must state	Factory review
Round bar	Diameter, tolerance, straightness, surface, length and bar-feeder or machining requirements.	Starting material, process route, tooling, inspection, MOQ and schedule are reviewed for the exact grade-size-condition combination.
Square bar	Side size, tolerance, corner radius, twist, straightness and length.	Starting material, process route, tooling, inspection, MOQ and schedule are reviewed for the exact grade-size-condition combination.
Flat bar	Width, thickness, edge condition, flatness, straightness and length.	Starting material, process route, tooling, inspection, MOQ and schedule are reviewed for the exact grade-size-condition combination.
Hexagonal bar	Across-flats size, tolerance, twist, straightness and length.	Starting material, process route, tooling, inspection, MOQ and schedule are reviewed for the exact grade-size-condition combination.
Custom profile	Dimensioned drawing, critical tolerances, corner radii, datum scheme, annual demand and trial quantity.	Starting material, process route, tooling, inspection, MOQ and schedule are reviewed for the exact grade-size-condition combination.

Standards and Primary Reference Sources

SAE J404: SAE publisher route for chemical compositions of SAE alloy steels; the contract must state the required edition.
ASTM A108-24: ASTM specification route for carbon and alloy cold-finished steel bars.
BS EN 10277:2018: Technical delivery conditions for bright steel products in drawn, peeled/turned or ground condition.
Ovako 34CrNiMo6 material data: Mill technical reference for the grade family and similar designations; it does not establish order-level equivalence.

Reference boundary: publisher, association and mill pages support terminology and buyer verification. They are not Junxiong heat certificates and do not prove that every designation, product form or delivery condition is interchangeable.

Buyer Checklist Before Quotation

Exact grade designation, governing standard and standard edition.
Shape, finished dimensions and machining allowance.
Dimensional tolerance, straightness, twist and corner-radius limits.
Delivery and heat-treatment condition.
Surface condition and defect limits.
Required strength, hardness or hardenability range and test location.
MTC, heat traceability and third-party inspection requirements.
Quantity per size, repeat demand, destination, schedule and packing.

FAQ for 4340 and 34CrNiMo6 Bar Buyers

Can Junxiong supply 4340 cold drawn round bar?

Junxiong can review the requirement after receiving diameter, tolerance, straightness, surface, length, condition, property requirements, quantity and destination.

Is EN24 identical to 4340 or 34CrNiMo6?

No universal equality is assumed. EN24 is a commonly used comparison term, while the actual purchase standard, chemistry, heat treatment and required properties govern acceptance.

Why must the section size be stated?

Section size and processing route can affect heat-treatment response and inspection planning. A valid quotation needs the finished section and condition.

Can non-round 4340 sections be reviewed?

Yes, square, flat, hexagonal and drawing-based sections can be reviewed subject to starting material, tooling, reduction and quantity.

Can an order include MTC and third-party inspection?

Yes, when certificate type, heat traceability, test items, witness points and third-party requirements are agreed before production.

Related Cold Drawn Steel Pages

Send the complete 4340 or 34CrNiMo6 specification for factory review.