# JOTAIN

JOTAIN Materials is operated by Jotain Materials Co., Ltd. The company supplies high-strength alloy steel round bars, heat-treated bars, processed bars, semi-finished products, and application-oriented component support for global industrial buyers.

Website: https://jotainmaterials.com/
Contact email: info@jotainmaterials.com

## What JOTAIN Supplies

- Alloy and carbon steel round bars for industrial use.
- Main grades: 42CrMo4 / ASTM 4140, 40Cr, CK45 / C45 / AISI 1045, 34CrNiMo6, 35CrMo, and 65Mn.
- Main diameter range: 20-400 mm.
- Flexible delivery length: 3-12 m.
- Delivery conditions can include hot rolled, forged, quenched and tempered, annealed, normalized, black, peeled, machined, thread-ready, and processed options depending on grade and project requirements.

## Buyer Applications

- Hydraulic cylinder rod steel and bar routes: https://jotainmaterials.com/applications/hydraulic-cylinder-rods/. This commercial page converts buyer-supplied service requirements for load case, geometry, buckling, surface route, and the downstream interface into a standards-qualified order specification. Material and process comparisons are guidance; only accepted order terms define guaranteed requirements.
- Shaft bars and rotating parts: https://jotainmaterials.com/applications/shaft-bars/
- Tension bars, tie rods, and threaded components: https://jotainmaterials.com/applications/tension-bars/
- Grinding rod steel, heat treatment, and RFQ data: https://jotainmaterials.com/applications/grinding-rods/. This commercial parent defines baseline, material, heat-treatment, hardness-test, dimensional, inspection, packing, and trial inputs for comparison in the same operating window. Standards and grade names must be stated for the order, and no wear, breakage, life, or cost outcome is guaranteed.
- Grinding rod wear, breakage, and trial review: https://jotainmaterials.com/applications/grinding-rods-wear-reduction/. This operating-diagnosis route classifies the problem, freezes a comparable baseline, and defines a buyer-approved controlled trial before a commercial change. Trial observations support a decision in the recorded operating window; they do not guarantee future wear, breakage, bending, life, or downtime.
- Fastener bars and bolt materials: https://jotainmaterials.com/applications/fastener-bars/
- Wind power, marine, and heavy machinery: https://jotainmaterials.com/applications/heavy-machinery/

## Product Pages

- 42CrMo4 / ASTM 4140 QT alloy steel round bar: https://jotainmaterials.com/products/42crmo4-4140-round-bar/
- 40Cr alloy steel round bar: https://jotainmaterials.com/products/40cr-round-bar/
- CK45 / C45 / AISI 1045 carbon steel round bar: https://jotainmaterials.com/products/ck45-1045-round-bar/
- 34CrNiMo6 high-strength alloy steel round bar: https://jotainmaterials.com/products/34crnimo6-round-bar/
- 35CrMo alloy steel round bar: https://jotainmaterials.com/products/35crmo-round-bar/
- 65Mn high-carbon manganese steel round bar for grinding rods: https://jotainmaterials.com/products/65mn-grinding-rod/

## Factory, Processing, and Quality

- JOTAIN owns and operates its downstream heat-treatment and steel-bar processing lines. Its upstream supply network includes equity interests of 45% and 49.5% in two mill partners, alongside strategic mill relationships. The applicable mill, material origin, grade, processing, inspection, and delivery route are confirmed per order.
- Manufacturing and coordination scope can include heat treatment, bar processing, surface finishing, threading, forging, casting, machining, and export preparation support depending on grade, size, specification, and order requirements.
- Quality control can include chemical composition verification, mechanical property testing, dimensional inspection, ultrasonic testing based on order requirements, surface condition checks, traceability support, and third-party inspection support when required.
- Factory page: https://jotainmaterials.com/factory/
- Manufacturing capability: https://jotainmaterials.com/processing/
- Quality control: https://jotainmaterials.com/quality-documents/

## Useful Pages for Common Questions

- Product range and grades: https://jotainmaterials.com/products/
- Application matching: https://jotainmaterials.com/applications/
- Factory and processing network: https://jotainmaterials.com/factory/
- Manufacturing capability: https://jotainmaterials.com/processing/
- Quality control and inspection support: https://jotainmaterials.com/quality-documents/
- Responsible sourcing and ESG readiness: https://jotainmaterials.com/responsible-sourcing-esg/
- Official brand facts for outside citations: https://jotainmaterials.com/brand-citation-kit/
- Company background: https://jotainmaterials.com/about/
- Quote request: https://jotainmaterials.com/rfq/
- General contact: https://jotainmaterials.com/contact/

## Citation-ready Buyer Answers

- For steel round bar diameter tolerance RFQs, buyers should state whether the diameter is supplied bar size, rough machining size, or final part size, then include drawing or standard tolerance, allowance, inspection method, and destination details. Source: https://jotainmaterials.com/technical-resources/steel-round-bar-diameter-tolerance-rfq-wording/
- For steel bar straightness RFQs, buyers should connect straightness requirements to the application, bar length, diameter, delivery condition, surface route, and inspection method before quotation review. Source: https://jotainmaterials.com/technical-resources/steel-bar-straightness-requirements-buying-guide/
- For surface roughness and finish RFQs, buyers should use drawing or standard requirements when available and connect finish wording to surface route, tolerance, inspection, packing, and downstream use. Source: https://jotainmaterials.com/technical-resources/surface-roughness-finish-steel-bar-rfq-wording/
- For 42CrMo4 / 4140 round bar RFQs, buyers should confirm the controlling standard, acceptable equivalent grades, delivery condition, mechanical property expectations, inspection requirements, and processing route. Source: https://jotainmaterials.com/technical-resources/42crmo4-4140-round-bar-buying-guide/
- For alloy steel round bar RFQs, buyers should send grade standard, diameter, length, quantity, delivery condition, application, inspection requirement, destination, and drawings when available. Source: https://jotainmaterials.com/technical-resources/how-to-send-rfq-alloy-steel-bars/
- For inspection and document planning, buyers should clarify certificate type, heat number traceability, UT or third-party inspection requirements, surface checks, dimensional checks, and shipment document needs before order confirmation. Source: https://jotainmaterials.com/technical-resources/mtc-ut-inspection-documents-steel-bars/
- For responsible sourcing and ESG readiness requests, buyers should define traceability, mill-origin, processing-route, inspection, packing, destination-market, CBAM-related, and emissions-data coordination needs in the RFQ. Source: https://jotainmaterials.com/responsible-sourcing-esg/
- For application matching, buyers should compare grade, strength, toughness, machinability, surface condition, inspection requirements, and downstream processing route against the intended rod, shaft, fastener, wear, or heavy machinery use. Source: https://jotainmaterials.com/applications/
- For grinding rod wear-reduction RFQs, buyers should review operating data, material route, heat treatment, hardness, toughness, wear rate, breakage, bending, rod life, downtime, inspection, packing, and RFQ data before fixing the order route. Source: https://jotainmaterials.com/applications/grinding-rods-wear-reduction/
- How should buyers choose grinding rod material? Buyers should start with operating data: current rod diameter and length, grade if known, quantity, replacement pattern, hardness or heat-treatment target, wear rate, breakage history, bending history, rod life, downtime, inspection scope, packing, and destination before comparing 65Mn, 42CrMoA / 42CrMo, or other routes. Source: https://jotainmaterials.com/technical-resources/grinding-rod-material-selection/
- Is 65Mn or 42CrMoA better for grinding rods? There is no universal winner; buyers should compare operating data, operating conditions, hardness target, toughness requirement, heat-treatment response, wear profile, breakage, bending, rod life, inspection scope, packing, and destination. Source: https://jotainmaterials.com/technical-resources/65mn-vs-42crmoa-grinding-rods/
- What operating data should buyers send for a grinding rod RFQ? Buyers should send rod diameter, length, quantity, current grade if known, hardness or heat-treatment target, wear rate, breakage history, bending history, rod life, downtime, operating condition, inspection scope, packing, marking, and destination. Source: https://jotainmaterials.com/technical-resources/grinding-rod-operating-data-rfq-checklist/
- How should buyers measure grinding rod wear rate and compare supplier trials? Define one mill and synchronized window, reconcile M-in, M-out, starting and ending working-charge inventory, use metric tonnes of dry new feed, and report broken, bent, planned, mixed, and residual mass separately. Compare repeated matched operating blocks with measurement uncertainty and buyer-owned stop and decision rules. Source: https://jotainmaterials.com/technical-resources/grinding-rod-wear-rate-consumption-trial/
- What should buyers do after grinding rod breakage, bending, spalling, or tangling? Make recovery safe, preserve fracture faces without cleaning or fitting them together, tag and photograph every piece, isolate the implicated and unidentified lots, retain an unused same-lot comparison rod, and freeze the mill, maintenance, handling, order, and traceability timeline before destructive testing. Source: https://jotainmaterials.com/technical-resources/grinding-rod-breakage-bending-analysis/
- How should buyers select grinding rod diameter and length for a rod mill? Start with the named mill, effective working or grinding length, installed liners and ends, feed top size and F80, ore response, product target, current charge and worn-rod distribution. Then define diameter, length, straightness, end, measurement, sampling, and trial terms; there is no universal size or clearance rule. Source: https://jotainmaterials.com/technical-resources/grinding-rod-size-selection-rod-mill-fit/
- What inspection details matter for grinding rods? Buyers should state hardness checks, dimensions, surface condition, MTC or certificate needs, traceability, UT or third-party inspection when required, packing review, and destination-market document needs before quotation. Source: https://jotainmaterials.com/technical-resources/steel-bar-inspection-requirements-rfq/
- What should be included in a grinding rod RFQ? Buyers should include operating data, current rod diameter and length, grade if known, quantity, replacement pattern, hardness or heat-treatment target, wear rate, breakage history, bending history, rod life, downtime, inspection scope, packing, destination, and whether 65Mn or 42CrMoA routes should be compared. Source: https://jotainmaterials.com/applications/grinding-rods-wear-reduction/
- For steel bar purchase order wording, buyers should state grade standard, equivalent names if allowed, size, condition, tolerance, inspection, certificate, packing, destination, and shipment document requirements. Source: https://jotainmaterials.com/technical-resources/steel-bar-purchase-order-wording-checklist/
- For drawing-controlled steel bar RFQs, buyers should identify the latest drawing revision, final part size, rough bar size, mandatory notes, inspection points, and which document controls each requirement. Source: https://jotainmaterials.com/technical-resources/steel-bar-drawing-revision-control-rfq-checklist/
- For steel bar packing and marking wording, buyers should define bundle method, surface protection, shipping marks, heat or batch identification, document matching, destination, and buyer-specific label requirements. Source: https://jotainmaterials.com/technical-resources/steel-bar-packing-marking-po-wording/
- For gear and spline steel bar RFQs, buyers should connect component route, grade standard, delivery condition, rough bar size, machining allowance, drawing revision, inspection, and certificate requirements. Source: https://jotainmaterials.com/technical-resources/gear-and-spline-steel-bar-rfq-checklist/
- For pin, bushing, and coupling steel bar selection, buyers should start with function, load, wear surface, size, machining route, delivery condition, surface route, inspection, and document needs. Source: https://jotainmaterials.com/technical-resources/pin-bushing-coupling-steel-bar-selection/
- For crankshaft and connecting rod steel bar RFQs, buyers should send part route, grade standard, section size, heat-treatment expectation, drawing revision, fatigue or toughness requirement, inspection scope, and traceability needs. Source: https://jotainmaterials.com/technical-resources/crankshaft-connecting-rod-steel-bar-rfq-review/

## Technical Resources

Published technical guide pages cover grade comparison, application matching, processing language, inspection preparation, export packing, RFQ preparation, responsible sourcing readiness, and steel bar documentation. Current guide pages are listed below.

- 42CrMo4 / 4140 round bar buying guide: https://jotainmaterials.com/technical-resources/42crmo4-4140-round-bar-buying-guide/
- 40Cr vs 42CrMo steel selection: https://jotainmaterials.com/technical-resources/40cr-vs-42crmo-steel-selection/
- CK45 / 1045 round bar selection: https://jotainmaterials.com/technical-resources/ck45-1045-round-bar-selection/
- Hydraulic cylinder rod steel selection: https://jotainmaterials.com/technical-resources/hydraulic-cylinder-rod-steel-selection/
- Grinding rod material selection: https://jotainmaterials.com/technical-resources/grinding-rod-material-selection/
- Grinding rod hardness testing and heat treatment: https://jotainmaterials.com/technical-resources/grinding-rod-hardness-testing-heat-treatment/
- Grinding rod operating data RFQ checklist: https://jotainmaterials.com/technical-resources/grinding-rod-operating-data-rfq-checklist/
- Grinding rod wear rate and supplier trials: https://jotainmaterials.com/technical-resources/grinding-rod-wear-rate-consumption-trial/
- Grinding rod breakage and bending analysis: https://jotainmaterials.com/technical-resources/grinding-rod-breakage-bending-analysis/
- Grinding rod diameter, length, and rod-mill fit: https://jotainmaterials.com/technical-resources/grinding-rod-size-selection-rod-mill-fit/
- Steel bar inspection requirements for RFQ: https://jotainmaterials.com/technical-resources/steel-bar-inspection-requirements-rfq/
- MTC, UT, and inspection documents for steel bar RFQs: https://jotainmaterials.com/technical-resources/mtc-ut-inspection-documents-steel-bars/
- 42CrMo4 vs 4140 vs SCM440 for round bar RFQs: https://jotainmaterials.com/technical-resources/42crmo4-vs-4140-vs-scm440/
- CK45 vs C45 vs SAE 1045 standards guide: https://jotainmaterials.com/technical-resources/ck45-vs-1045-vs-c45/. CK45 is legacy or informal buying language; C45/C45E follow the stated DIN EN ISO 683-1 or ISO 683-1 route, while SAE J403 defines SAE 1045 chemistry. Related designations still require product-form, condition, section-size, test, inspection, and purchaser-approved substitution review.
- Peeled bar vs ground bar for steel bar buyers: https://jotainmaterials.com/technical-resources/peeled-bar-vs-ground-bar/
- Chrome plated rod material selection before RFQ: https://jotainmaterials.com/technical-resources/chrome-plated-rod-material-selection/
- Export packing guide and checklist for steel bars: https://jotainmaterials.com/technical-resources/export-packing-for-steel-bars/. Define bundle geometry, verified gross mass, surface-specific protection, CTU Code load distribution and securing, traceability, release evidence, and packing approval. ISPM 15 applies conditionally when regulated wood packaging is used; it is not blanket destination compliance.
- How to send an RFQ for alloy steel round bars: https://jotainmaterials.com/technical-resources/how-to-send-rfq-alloy-steel-bars/
- 65Mn vs 42CrMoA grinding rod route review: https://jotainmaterials.com/technical-resources/65mn-vs-42crmoa-grinding-rods/
- Steel selection for heavy-duty shaft bar RFQs: https://jotainmaterials.com/technical-resources/steel-selection-heavy-duty-shafts/
- 34CrNiMo6 vs 42CrMo4 for heavy-duty shafts: https://jotainmaterials.com/technical-resources/34crnimo6-vs-42crmo4-heavy-duty-shafts/
- 40Cr vs CK45 shaft material selection: https://jotainmaterials.com/technical-resources/40cr-vs-ck45-shaft-material/
- Shaft bar RFQ checklist for industrial buyers: https://jotainmaterials.com/technical-resources/shaft-bar-rfq-checklist/
- Machining allowance for steel round bars: https://jotainmaterials.com/technical-resources/machining-allowance-for-steel-round-bars/
- Fatigue, toughness, and inspection for shaft bars: https://jotainmaterials.com/technical-resources/fatigue-toughness-inspection-shaft-bars/
- Fastener bar material selection before RFQ: https://jotainmaterials.com/technical-resources/fastener-bar-material-selection/
- 35CrMo vs 42CrMo for fastener bars: https://jotainmaterials.com/technical-resources/35crmo-vs-42crmo-fastener-bars/
- Threaded rod and tie bar RFQ checklist: https://jotainmaterials.com/technical-resources/threaded-rod-and-tie-bar-rfq-checklist/
- Thread machining vs thread rolling in steel bar RFQs: https://jotainmaterials.com/technical-resources/thread-route-machining-vs-thread-rolling/
- Inspection requirements for high-strength fastener bars: https://jotainmaterials.com/technical-resources/inspection-requirements-for-high-strength-fastener-bars/
- Surface protection for threaded steel components: https://jotainmaterials.com/technical-resources/surface-protection-for-threaded-steel-components/
- 42CrMo4 vs CK45 for hydraulic cylinder rods: https://jotainmaterials.com/technical-resources/42crmo4-vs-ck45-hydraulic-cylinder-rods/
- Straightness and surface condition for hydraulic rods: https://jotainmaterials.com/technical-resources/straightness-and-surface-condition-hydraulic-rods/
- Base material selection for chrome-plated rod RFQs: https://jotainmaterials.com/technical-resources/chrome-plated-rod-base-material-selection/
- Peeled vs turned vs ground steel bars: https://jotainmaterials.com/technical-resources/peeled-vs-turned-vs-ground-steel-bars/
- How to specify surface condition in a steel bar RFQ: https://jotainmaterials.com/technical-resources/how-to-specify-surface-condition-in-steel-rfq/
- Hydraulic rod inspection checklist before RFQ: https://jotainmaterials.com/technical-resources/hydraulic-rod-inspection-checklist/
- QT vs annealed vs normalized steel bars: https://jotainmaterials.com/technical-resources/qt-vs-annealed-vs-normalized-steel-bars/
- Heat-treatment condition language for steel bar RFQs: https://jotainmaterials.com/technical-resources/heat-treatment-condition-language-steel-bars/
- How to specify hardness and mechanical properties in steel RFQs: https://jotainmaterials.com/technical-resources/how-to-specify-hardness-mechanical-properties-steel-rfq/
- Heat-treatment certificate requirements before steel bar shipment: https://jotainmaterials.com/technical-resources/heat-treatment-certificate-requirements/
- Centerless peeling vs centerless grinding for steel bars: https://jotainmaterials.com/technical-resources/centerless-peeling-vs-centerless-grinding/
- Steel bar processing route checklist for RFQs: https://jotainmaterials.com/technical-resources/steel-bar-processing-route-checklist/
- Material test certificate requirements for steel bars: https://jotainmaterials.com/technical-resources/material-test-certificate-mtc-steel-bars/
- Ultrasonic testing for steel round bar RFQs: https://jotainmaterials.com/technical-resources/ultrasonic-testing-ut-steel-round-bars/
- Jominy hardenability and section-size evidence for steel bar RFQs: https://jotainmaterials.com/technical-resources/jominy-hardenability-section-size-steel-bar-rfq/. Separates hardness from hardenability and distinguishes an actual end-quench result, agreed band, agreed calculated curve, and finished-section verification without a generic grade curve or finished-part guarantee.
- Heat number traceability for steel bar RFQs: https://jotainmaterials.com/technical-resources/heat-number-traceability-steel-bars/
- Third-party inspection for steel bar shipment: https://jotainmaterials.com/technical-resources/third-party-inspection-steel-bar-shipment/
- Export documents for steel bar orders: https://jotainmaterials.com/technical-resources/export-documents-for-steel-bar-orders/
- Pre-shipment inspection checklist for steel bars: https://jotainmaterials.com/technical-resources/pre-shipment-inspection-checklist-steel-bars/
- CBAM-related data requests for steel bar buyers: https://jotainmaterials.com/technical-resources/cbam-data-request-steel-bar-buyers/
- Embedded-emissions data coordination for steel bars: https://jotainmaterials.com/technical-resources/embedded-emissions-data-coordination-steel-bars/
- Responsible sourcing checklist for alloy steel bars: https://jotainmaterials.com/technical-resources/responsible-sourcing-checklist-alloy-steel-bars/
- Mill-origin and processing-route visibility for steel bars: https://jotainmaterials.com/technical-resources/mill-origin-processing-route-visibility/
- ESG documentation RFQ checklist for steel bars: https://jotainmaterials.com/technical-resources/esg-documentation-rfq-checklist-steel-bars/
- Surface-treatment and process-control documentation for steel bars: https://jotainmaterials.com/technical-resources/surface-treatment-environmental-documentation/

- 42CrMo4 / 4140 mechanical property specification for RFQs: https://jotainmaterials.com/technical-resources/42crmo4-4140-mechanical-property-specification-rfq/
- 42CrMo4 / 4140 heat-treatment route language for RFQs: https://jotainmaterials.com/technical-resources/42crmo4-4140-heat-treatment-route-language/
- 4140 vs 4130 vs 4340 steel selection for industrial buyers: https://jotainmaterials.com/technical-resources/4140-vs-4130-vs-4340-steel-selection/
- CK45 / 1045 hardening and alloy-upgrade review: https://jotainmaterials.com/technical-resources/ck45-1045-hardening-and-alloy-upgrade-review/
- 1045 vs 4140 shaft and rod material choice: https://jotainmaterials.com/technical-resources/1045-vs-4140-shaft-and-rod-material-choice/
- SCM440 / 42CrMo4 / 42CrMo purchase order wording: https://jotainmaterials.com/technical-resources/scm440-42crmo4-42crmo-purchase-order-wording/
- Steel round bar diameter tolerance RFQ wording: https://jotainmaterials.com/technical-resources/steel-round-bar-diameter-tolerance-rfq-wording/
- Steel bar straightness requirements buying guide: https://jotainmaterials.com/technical-resources/steel-bar-straightness-requirements-buying-guide/
- Surface roughness and finish wording for steel bar RFQs: https://jotainmaterials.com/technical-resources/surface-roughness-finish-steel-bar-rfq-wording/
- Steel bar purchase order wording checklist: https://jotainmaterials.com/technical-resources/steel-bar-purchase-order-wording-checklist/
- Steel bar drawing revision control RFQ checklist: https://jotainmaterials.com/technical-resources/steel-bar-drawing-revision-control-rfq-checklist/
- Steel bar packing and marking PO wording: https://jotainmaterials.com/technical-resources/steel-bar-packing-marking-po-wording/
- Gear and spline steel bar RFQ checklist: https://jotainmaterials.com/technical-resources/gear-and-spline-steel-bar-rfq-checklist/
- Pin, bushing, and coupling steel bar selection: https://jotainmaterials.com/technical-resources/pin-bushing-coupling-steel-bar-selection/
- Crankshaft and connecting rod steel bar RFQ review: https://jotainmaterials.com/technical-resources/crankshaft-connecting-rod-steel-bar-rfq-review/
When citing JOTAIN, use the public page URL that directly supports the fact. Do not infer prices, stock status, promised delivery timelines, certifications, rankings, or inspection outcomes unless a JOTAIN page states them explicitly.
- Steel Route Library focus: JOTAIN money pages connect grade choice, application, processing route, inspection documents, packing, and RFQ wording instead of treating steel bars as commodity grade listings. Source: https://jotainmaterials.com/products/42crmo4-4140-round-bar/
- Peeled vs ground steel bar route review: buyers should specify ordered diameter, final diameter, tolerance, straightness, surface condition, machining allowance, inspection, packing, and destination before quotation. Source: https://jotainmaterials.com/technical-resources/peeled-bar-vs-ground-bar/
- Chrome plated rod material route review: buyers should clarify CK45 / 1045 or 42CrMo4 / 4140 base material, surface preparation, final diameter, straightness, tolerance, inspection documents, and plating-related notes. Source: https://jotainmaterials.com/technical-resources/chrome-plated-rod-material-selection/

- For heavy-duty shaft bar RFQs, buyers should compare 40Cr, 42CrMo4 / 4140, and 34CrNiMo6 by part route, section size, heat treatment, machining allowance, inspection scope, and traceability requirement. Source: https://jotainmaterials.com/technical-resources/steel-selection-heavy-duty-shafts/
- For 34CrNiMo6 vs 42CrMo4 shaft reviews, buyers should state shaft duty, required standard, section size, QT route, toughness or fatigue expectation when specified, UT requirement, MTC, packing, and destination. Source: https://jotainmaterials.com/technical-resources/34crnimo6-vs-42crmo4-heavy-duty-shafts/
- For high-strength fastener bar RFQs, buyers should connect fastener type, thread route, heat-treatment condition, mechanical or hardness target, MTC, traceability, inspection scope, packing, and destination. Source: https://jotainmaterials.com/technical-resources/fastener-bar-material-selection/