06 Mining & Industrial Machinery
Balance hardness, toughness and section size.
JOTAIN can support wear-oriented and load-bearing steel routes for grinding rods, shafts, pins, fastener material, and rough-machined heavy components when the OEM defines failure mode, geometry, properties, inspection, and operating context.
Component catalogue / 01
Where we can enter the supply route
Start with the component, then define the material condition, processing boundary, inspection plan, and documentary release.
Grinding rods
Wear-oriented, heat-treated rods for purchaser-defined rod-mill service.
- Grade selection
- Heat-treatment route
- Fixed length and end condition
Shaft and pin blanks
Tough, hardenable blanks for heavy rotating and articulated machinery.
- QT bar
- Peeling or rough machining
- UT when specified
Tie and fastener bar
Alloy bar routes for high-load threaded machinery components.
- Heat-treated bar
- Thread-ready preparation
- Mechanical acceptance
Rough-machined heavy parts
Prepared components supplied with drawing-defined allowance and inspection.
- Forged or rolled route
- Rough machining
- Dimensional report
Engineering conditions / 02
Define the service before the grade
The candidate route becomes meaningful only after load, environment, geometry, interfaces, and acceptance criteria are controlled.
Wear and impact
Hardness cannot be selected without the actual damage mode.
- Abrasive wear
- Impact severity
- Breakage and spalling history
Section response
Heat-treatment response changes with diameter and geometry.
- Section hardenability
- Core toughness
- Hardness profile
Manufacturing interface
Allowance and inspection depend on the next machining or assembly step.
- Straightness and end condition
- Machining allowance
- UT and surface acceptance
Material route / 03
Material selection boundary
Candidate routes are matched to wear or load-bearing failure mode, section size, target hardness and toughness, machining, and the OEM drawing.
| Grade | Condition | Why it enters review | Application guardrail |
|---|---|---|---|
| 65Mn | Heat-treated grinding rod | Wear-oriented route for purchaser-defined rod-mill applications. | Hardness, toughness, straightness, and end condition must be agreed together. |
| 42CrMo4 / 4140 | QT or rough-machined | Candidate high-strength route for shafts, pins, and heavy components. | Section size and core properties control suitability. |
| 34CrNiMo6 | QT or forged route | Higher-hardenability and toughness route for heavy sections. | Use only when the OEM specification and property targets require it. |
| 40Cr | Heat-treated or machined blank | Candidate route for general industrial machinery parts. | Use depends on load, section, fatigue, and machining requirements. |
Processing sequence / 04
A route that can be inspected
- 01Approved bar or forging route
- 02Heat treatment
- 03Straightening and cutting
- 04Peeling or rough machining
- 05Hardness and integrity checks
- 06End protection and export packing
Verification / 05
Evidence travels with the route
Define test location, acceptance criteria, inspection timing, marking, and release records before production.
Wear-route control
- Hardness target and profile
- Heat-treatment record
- Straightness and end condition
Load-bearing properties
- Tensile properties
- Impact testing when specified
- Section-aware acceptance
Integrity and geometry
- UT when specified
- Surface condition
- Machining allowance and dimensions
Standards context / 06
Reference the rule set—do not imply approval
The purchaser's approved drawing, project specification, inspection and test plan, and contractual standard editions control the order.
ISO 683-2
Technical delivery context for alloy steels used in quenched-and-tempered machine parts.
Open reference ↗ISO 6336-1
Gear load-capacity design context when the OEM supplies gear-related service inputs; not a material compliance claim.
Open reference ↗Technical enquiry / 07
Send an enquiry engineering can review.
Include these inputs to reduce assumptions, shorten technical clarification, and keep the proposed route inside the purchaser's design boundary.
- 01Machine and component
- 02OEM drawing and specification
- 03Failure mode and operating context
- 04Grade or approved material
- 05Diameter, length, and allowance
- 06Delivery and heat-treatment condition
- 07Hardness and mechanical targets
- 08Impact and NDT requirements
- 09Quantity and packing
- 10Destination