DimensionsMatch the rod to your mill.
Dimensions
Regular diameter Ø60–160 mm. Specify the mill’s working length, rod length, tolerances, straightness and end condition.
Review diameter and length
Grinding rods
Heat-treated grinding rods.
Heat-treated steel grinding rods in regular diameters of Ø60–160 mm, straightened and cut to the length agreed for your mill.
Request a quotationGrinding rod dimensions and supply range
Material, dimensions, performance and inspection belong in the same discussion.
Dimensions
Material & heat treatmentSpecify the grade and condition.
Material & heat treatment
Available material routes include 65Mn, 40Cr, 42CrMoA and 50#. The grade alone does not define delivered performance; agree the heat treatment and hardness requirements.
Compare materials
Operating conditionsPlan a rod-mill trial
Operating conditions
Before requesting a trial lot, define the operating baseline, the change to evaluate and the acceptance criteria.
Plan a mill trial
Test evidenceRead each measured position.
Test evidence
One 65Mn specimen has 25 valid readings. No measurements are recorded between 12.5 mm and the core. The image is an illustration.
View hardness readings
TraceabilityLink records to the delivered lot.
Traceability
Agree chemistry, dimensions, sampling and report contents. Connect the heat identity with test records and delivery markings.
Review lot records
Packing & destinationInclude the delivery requirements.
Packing & destination
Provide quantity, destination, required delivery date and packing requirements. Confirm bundle mass and documentation in the offer.
Specify packing and destinationSupply and inspection
Grinding rod materials and inspection
For a repeat order, use the grade and specification approved by your team for that mill. To review another material, send the current dimensions and records of rod consumption, bending or breakage. The buyer’s technical representative must approve any substitution before the order is confirmed.
Manganese steel
65Mn
Finished rods, heat treated, straightened and cut to length. See the supply specification and measured hardness of one 65Mn specimen below.
Specifications and measured hardnessAlloy steel
40Cr
For orders specifying 40Cr, confirm the diameter, heat-treatment condition and finished-rod inspection requirements.
Enquire about this materialChromium–molybdenum steel
42CrMoA
Quote 42CrMoA against the specified standard, chemistry and A-suffix requirements. Review any proposed 42CrMo4 or 4140 substitution separately.
Enquire about this materialCarbon steel
50#
Confirm the governing standard, chemistry, dimensions and delivery condition for the order. No automatic cross-standard substitution.
Enquire about this materialCompare grades using the finished-rod requirements
| Material | Basis for reviewing this grade | Evidence needed for the order |
|---|---|---|
| 65Mn | Heat-treated, straightened rods cut to the agreed length. This page includes hardness measurements at specified positions on one 65Mn sample of Ø110 × 2950 mm. | Use the specimen record to discuss measurement locations and methods. Agree the finished-rod acceptance limits and lot sampling separately. |
| 40Cr | An alloy-steel option to review when 40Cr is specified, or when comparing a proposed alternative with the current rods. | Provide the governing standard and current mill duty. Confirm heat treatment and finished-rod test results at the ordered diameter, linked to the heat identity. |
| 42CrMoA | A chromium–molybdenum option to review against the exact grade and standard in the purchase specification. | Confirm the A-suffix, chemistry and impurity limits. Request evidence for the specified diameter and condition; the 65Mn specimen data do not apply to this grade. 42CrMo4 and 4140 are not automatic substitutes. |
| 50# | A carbon-steel option to review against the current or proposed material specification. | Identify the governing standard and required delivery condition. Compare dimensions, heat treatment and finished-rod inspection requirements before accepting a substitution. |
Regular finished-rod diameters are Ø60–160 mm; availability is confirmed for the requested grade and size. Set length, straightness, lot hardness and sampling in the order, and obtain technical approval for any grade substitution.
Other grades can be reviewed against project requirements. Discuss your specification →
65Mn · Products
65Mn grinding rods
Send the rod diameter, ordered rod length, mill model, quantity and destination. Include your hardness and straightness requirements for the finished rods.
Enquire about 65Mn rodsThe supply sheet describes the product range. Measured hardness, straightness and heat-treatment lot details belong in the lot inspection report.
| Item | Supply and purchase basis |
|---|---|
| Product | Finished 65Mn steel grinding rods. |
| Diameter | Regular Ø60–160 mm; nominal diameter and tolerance are specified in the order. |
| Length | Cut to the fixed length accepted in the order, matched to the mill’s working space. |
| Preparation | Heat treatment, straightening and cutting. |
| Hardness | Define the acceptance range, method, specimen preparation and test locations in the specification. |
| Straightness and ends | Agree the measurement method, tolerance and end condition before manufacture. |
| Identification | Heat and manufacturing-lot identity linked to test records and bundle markings. |
| Delivery | Quantity, packing, bundle mass, destination and documents defined in the offer. |
Prepare your grinding-rod enquiry
Choose the document for the purchasing step. Fill in the information available and mark open items “to be agreed”.
- Fillable grinding-rod enquiry form — English PDF, 2 pages, Rev 1.0 (8 September 2026). Record dimensions, quantity, destination, inspection and any proposed trial.
- Plain-text enquiry checklist — English text for preparing the same requirements.
- Inspection and traceability guide — Connect the agreed checks to the sample, heat, production lot and bundle records.
Save the completed form. Send your enquiry here, then use the enquiry reference when sending drawings and supporting files.
JTN-HTR-20260715-01
Measured 65Mn hardness:
surface to core
65Mn · Ø110 × 2,950 mm · Heat 92605-1034
15 July 2026 · One specimen; results apply to that specimen only.
JOTAINHRC
8 mm
43.5Mean of four readingsSurface to core.
Reading 142.4
Reading 244.8
Reading 342.3
Reading 444.3
65Mn · JTN-HTR-20260715-01
JOTAINHRC
7 mm
47.7Mean of four readingsSurface to core.
Reading 147.9
Reading 247.0
Reading 348.1
Reading 447.7
65Mn · JTN-HTR-20260715-01
JOTAINHRC
Surface
52.7Mean of four readingsSurface to core.
Reading 152.3
Reading 252.8
Reading 353.1
Reading 452.6
65Mn · JTN-HTR-20260715-01
JOTAINHRC
12.5 mm
35.9Mean of four readingsSurface to core.
Reading 135.7
Reading 236.3
Reading 335.8
Reading 435.9
65Mn · JTN-HTR-20260715-01
JOTAINHRC
Core
36.6Single readingSurface to core.
Reading 136.6
65Mn · JTN-HTR-20260715-01
Surface to core.
Select a measured position and read the result alongside its test conditions.
Surface · Mean of four readings52.7HRC52.3 / 52.8 / 53.1 / 52.6
The report records hardness at specified positions on one 65Mn sample. It includes no acceptance criterion or conformity statement; the results are not lot statistics or guaranteed supply values. Agree acceptance limits and sampling for your order.
AI product illustration · Not a specimen photographView all 25 valid readings
| Position | Reading 1 | Reading 2 | Reading 3 | Reading 4 | Mean / HRC |
|---|---|---|---|---|---|
| Surface | 52.3 | 52.8 | 53.1 | 52.6 | 52.7 |
| 7 mm | 47.9 | 47.0 | 48.1 | 47.7 | 47.7 |
| 8 mm | 42.4 | 44.8 | 42.3 | 44.3 | 43.5 |
| 9 mm | 38.4 | 39.3 | 39.5 | 39.2 | 39.1 |
| 10 mm | 38.2 | 37.4 | 38.4 | 38.1 | 38.0 |
| 12.5 mm | 35.7 | 36.3 | 35.8 | 35.9 | 35.9 |
| Core | 36.6 | — | — | — | 36.6 (Single reading) |
At 7 mm, the third reported reading was corrected from 49.6 to 48.1 HRC; only 48.1 HRC is included in the calculations. No measurements are recorded between 12.5 mm and the core.
Original test report ↗JOTAIN MATERIALS
Technical documents and references
Material and inspection requirements
Supply requirements
Grinding rods matched to rod-mill operating conditions.
Start with rod dimensions, current consumption, breakage or bending history, and the mill's operating duty.
- 01ComponentGrinding rods
- 02Grade65Mn
- 03ConditionQ&T
- 04InspectionHardness response
- 05RFQRod size + destination
Duty inputs
Operating and dimensional requirements
- Mill duty
- Current rod consumption
- Breakage and bending
- Material route
Candidate grades
Steel grades and delivery condition
- 65Mn grinding rods65Mn for heat-treated grinding rods.
- 40CrAlternative route for defined mill duty and target performance.
- 42CrMoADefine chemistry, heat treatment and trial controls together.
- 50#Confirm the governing standard, delivered condition and inspection requirements for the order.
Supply and release
Inspection and batch traceability
- Supply stages
- Q&T · Straightened · Fixed length
- Inspection
- Hardness response · Straightness and length · Surface condition
Packing, inspection and purchasing records
THE PURCHASE FILE
Inspection & packing
Agree the rod specification, inspection record and bundle identification before release. Use our purchase checklist to send the dimensions, tests and packing requirements for your order.
Inspection, packing & enquiry sheet
Agree three records before release.
The rod specification
Mill identity; grade and delivery condition; diameter and length with tolerances; straightness method and limit; end condition; approved drawing revision.
The inspection record
Heat and treatment-lot identity; sampling plan; actual dimensional and hardness readings; test positions and method; acceptance limits; deviations and their disposition.
The packing record
Bundle number, rod quantity, dimensions and net/gross mass; lot-to-bundle mapping; labels and agreed dispatch photographs; packing-list and shipment references.
For packing, tell us the maximum bundle mass, lifting and unloading arrangement, destination storage conditions and any corrosion-protection requirements. Agree photographs of the bundle overview, readable labels, ends and protection before dispatch. For Chile or Peru, state the delivery location, proposed Incoterm and intended importer. Agree responsibility for freight, customs clearance, duties and taxes, inland transport and unloading in the quotation; flag any details still to be confirmed.
Keep the enquiry and receipt checks on one sheet.
A blank CSV with specification, inspection and packing fields. Open it in Excel, enter your requirements and return it with the mill drawing.
See a material-document example
This published, redacted 40Cr MTC shows how chemistry, mechanical properties and inspection status are presented. It is a material-document example, not a finished grinding-rod lot report. Specify the finished-rod records separately on the order.
Open the material certificate →
Purchasing questions
Grinding rod sizes, inspection and ordering questions
What should I send for a quotation?
Diameter, length, quantity and destination. Add the current grade and mill duty, or ask us to review the material route.
How should I specify hardness?
State the hardness range, method, test positions and acceptance criteria. Hardness alone does not establish service life.
Can I request a trial quantity?
Yes. Send the proposed quantity and mill duty. Supply terms and the comparison method are agreed before the trial.
Trial and technical notes
Can one trial batch establish a repeatable grinding rod performance result?
A controlled trial compares performance within its recorded operating period. Repeat the comparison under representative mill conditions before adopting routine supply; changes in ore, feed or charging practice can change the result.
Which hardness results should appear in the inspection record?
Request the individual readings, scale, method, test positions, sampling frequency, heat-treatment condition and lot identity. State the acceptance limits and the required inspection-document format in the order.
Which documents are useful for grinding rod orders?
Specify the inspection document standard, edition and type in the RFQ, including type 3.1 when required by your purchase specification. Agree the issuer, required test results and links between the material heat, processing lot and bundle marks. Include finished-rod dimensional, hardness and straightness records as specified, plus packing and shipment documents. A material certificate alone does not establish grinding performance in your mill.
What should I record if rods wear quickly, bend or break?
Start with rod dimensions, dated photographs, consumption or removal records, and mill conditions for the same period. Use those findings to define the trial material, dimensions and inspection plan for your enquiry.
Technical documents and references
Technical references
Grinding rod material, testing and RFQ guides.
Technical notes for comparing material routes and preparing a controlled mill trial.
Plan a grinding rod trialDefine the operating baseline, the change to test and acceptance criteria before requesting a trial lot.65Mn grinding rod steel barReview the published 65Mn grinding-rod material route. SUP6 and 66Mn4 labels do not establish automatic equivalence; any alternative requires technical review.Grinding rod material selectionReview material route, heat treatment, wear profile, and operating condition.
Grinding-rod technical details
Read material note → Compare material routes for your mill → Review rod inspection and traceability → Diameter and length selection guide → Hardness profile → Open the grinding rod trial ledger → Wear rate and consumption trial guide → Grinding rod enquiry checklist (English PDF) → Hardness and heat-treatment guide → Open matched process route
65Mn material, standards and purchasing information
Material and inspection requirements
65Mn grinding rod specifications
Cross-references help compare grades; they do not establish interchangeability. The drawing standard, delivery condition, dimensions and inspection scope define the order.
Standard map
Common cross-references
- GB
- 65Mn
- JIS
- SUP6 (silicon-manganese spring steel; not a direct 65Mn equivalent). SUP6A is an unverified enquiry designation, not established here as a JIS grade; identify its governing specification.
- DIN
- 66Mn4
- EN
- High-carbon manganese spring steel cross-references should be checked by standard and procurement route
Supply window
Published specification
- Product form
- Finished grinding rod or round-bar feedstock — specify the required form.
- Diameter basis
- Diameter and tolerance are set for the selected product form and production route.
- Length
- Fixed length to the accepted order
- Condition
- Heat treated / Cut to length
- Surface
- Black / Peeled / Processed after route review
Property reference
Mechanical route
- Hardness target
- State the test method, surface and core positions, and acceptance band
- Breakage / toughness review
- Share operating history and trial acceptance criteria
- Heat-treatment route
- State the grade standard, rod diameter, lot definition, and test plan
Chemistry reference
- 65Mn
- Use the chemistry table in the governing GB standard
- SUP6 / 66Mn4
- Treat these as separate routes and compare the full tables before substitution
Inspection & trials
Application & inspection scope
- Grinding rods for rod mills
- Wear-related rod products
- Abrasion-oriented industrial parts
- Spring and hardness-oriented mechanical components
- Industrial applications requiring heat-treatment response and practical toughness
- Chemical composition analysis
- Hardness or mechanical verification based on order requirements
- Dimensional inspection
- Surface condition check
Purchasing questions
Buyer questions
Is 65Mn only selected by chemical grade name?
No. 65Mn grinding rod review should connect grade, diameter, heat treatment, hardness, toughness, operating condition, inspection, packing, marking, and destination. The complete route matters for wear-related service.
What operating data helps a 65Mn grinding rod RFQ?
Useful RFQ data includes mill type, current rod grade, rod diameter, length, wear profile, breakage or bending issues, hardness target, replacement pattern, rod life, downtime, quantity, packing requirement, marking, destination, and trial-batch preference.
What inspection details matter for grinding rods?
Agree chemistry, finished diameter and length, straightness, surface condition, hardness method and test locations for the specified 65Mn delivery condition. If a type 3.1 inspection certificate is required, state its governing standard and edition, issuer and required results before order confirmation. Link the material heat to the heat-treatment lot, finished-rod inspection records and bundle identification; specify third-party inspection separately when needed.
Technical documents and references
Documents, tools & technical reading
Open matched process routeGrinding rod material selectionReview hardness, toughness, heat treatment, wear profile, and operating requirements.Operating data RFQ checklistPrepare size, wear, breakage, bending, rod life, inspection, packing, and destination details.Examples show a format; order documents must match your supply.
Finished 65Mn grinding rods · Order requirements
Hardness needs more than a number.
A surface reading does not describe the centre of a rod. To compare offers, identify the hardness scale, reading locations and acceptance range. Chemistry is checked against the ordered standard and edition; 65Mn, SUP6 and 66Mn4 are not substitutes on the strength of a cross-reference alone.
Define the hardness profile →Review tests and lot identification →From millimetres to kilograms per metre.
Use this table for an initial quantity and handling estimate. It assumes a solid cylindrical rod and a nominal density of 7,850 kg/m³; commercial mass follows the weighing basis agreed in the order.
View theoretical masses Ø60–160 mm
Mass per metre = π × (diameter in mm / 1,000)² × 7,850 / 4
| Nominal diameter | Theoretical mass |
|---|---|
| 60 mm | 22.20 kg/m |
| 80 mm | 39.46 kg/m |
| 100 mm | 61.65 kg/m |
| 120 mm | 88.78 kg/m |
| 140 mm | 120.84 kg/m |
| 160 mm | 157.83 kg/m |
Rounded to two decimal places; packing excluded. Multiply kg/m by length in metres to estimate one rod’s mass. This is not a stock or tolerance table.
65Mn grade specification
Supply sheet · English PDF Define the hardness profile → Review rod inspection and traceability → Hardness and heat-treatment guide → Trial ledger → Wear rate and consumption trial guide → Open matched process route Grinding rod material selectionReview hardness, toughness, heat treatment, wear profile, and operating requirements. Operating data RFQ checklistPrepare size, wear, breakage, bending, rod life, inspection, packing, and destination details. Size selection for rod mills
Microstructure research reference
65Mn research figure from the cited paper, provided as material background. It is not a micrograph of a current JOTAIN lot or of the hardness specimen shown here.
Original paper and image source ↗Ying Tong et al. · 2021
DOI: 10.3390/ma14247636 · CC BY 4.0
Inspection & trialsFrom a sample rod to a mill trial.
Review the mill-trial requirementsCompare the current rods and the trial lot in the same mill, with comparable ore, feed and operating conditions. Record rod mass consumed, dry ore tonnes processed, operating hours and rod additions over the same observation period. If rods bend or break, include their dimensions, photographs and operating history. Agree how the plant team will evaluate consumption in kg/t, bent or broken rods and downtime before the trial.
JOTAIN MATERIALS
Send your grinding-rod specification.
State whether you need finished grinding rods or bar stock for processing. Include the mill model, diameter, length, delivery condition, and required hardness and straightness. Add quantity or tonnage, bundle-weight limits, destination, required delivery date and inspection documents; confirm packing, traceability markings and delivery terms in the quotation.