| Main Machine Frame | Welded structural carbon steel, typically equivalent to common structural grades such as S355 | High yield strength, good weldability, and adequate stiffness for heavy loads | Stress-relieved welding, precision machining of mounting surfaces, diagonal bracing, and verified dimensional tolerances | EN 10025-2; weld quality inspection according to ISO 5817 | Reduces frame distortion, vibration, and alignment loss during continuous operation | Check weld continuity, flatness of mounting pads, frame squareness, and deformation after a loaded trial run | Very High |
| Roller Shafts and Drive Shafts | Quenched-and-tempered alloy steel, such as 42CrMo4-type steel | High tensile strength, fatigue resistance, and improved toughness after heat treatment | Controlled heat treatment, journal grinding, radiused shoulders, and non-destructive testing for cracks | EN 10083-3; ultrasonic or magnetic-particle inspection where appropriate | Improves resistance to bending fatigue, torsional stress, and repeated impact loading | Verify hardness records, shaft runout, surface finish, keyway quality, and concentricity | Very High |
| Forming and Sizing Rolls | Hardened alloy tool steel or wear-resistant bearing steel, selected according to pipe material and load | High surface hardness, compressive strength, dimensional stability, and wear resistance | Computer-controlled turning or grinding, polished forming surfaces, balanced rolls, and replaceable roll tooling | Dimensional inspection; hardness testing; surface roughness measurement | Maintains pipe geometry and reduces scoring, surface defects, and frequent roll replacement | Check roll profile accuracy, surface roughness, hardness uniformity, and axial alignment | Very High |
| Roll Surface Treatment | Chromium plating, nitriding, or other verified wear-resistant surface treatment | Improved hardness, lower friction, corrosion resistance, and resistance to adhesive wear | Controlled coating thickness, strong adhesion, uniform coverage, and edge protection against peeling | Coating thickness, adhesion, porosity, and surface roughness tests | Extends roll service intervals when processing abrasive, coated, or high-strength steel strip | Inspect for flaking, pitting, uneven coating, sharp edges, and changes in roll diameter | High |
| Bearings and Bearing Housings | Through-hardened bearing steel with machined cast or fabricated steel housings | High rolling-contact fatigue strength, dimensional accuracy, and resistance to contamination | Correct fits and clearances, sealed lubrication paths, rigid housings, and accessible maintenance points | ISO 281 for bearing life calculations; ISO 15243 for damage classification | Reduces overheating, shaft misalignment, vibration, and unplanned downtime | Check bearing temperature, vibration, lubrication condition, axial play, and housing rigidity | Very High |
| Guides, Bushings, and Sliding Parts | Hardened steel, bronze alloy, or engineered wear material selected for the lubrication system | Low friction, seizure resistance, dimensional stability, and compatibility with the working environment | Replaceable wear inserts, accurately finished sliding surfaces, lubrication grooves, and protected adjustment screws | Surface roughness and dimensional tolerance inspection; friction and wear testing when required | Maintains strip or tube alignment and limits backlash in repeated adjustment cycles | Look for uneven wear, scoring, excessive clearance, blocked lubrication passages, and difficult adjustment | High |
| Hydraulic Cylinders and Manifolds | Honed steel cylinder tubes, alloy-steel rods, and corrosion-resistant rod coatings | Pressure resistance, smooth bore finish, rod hardness, and seal compatibility | Honed bores, concentric rod machining, protected seals, clean hydraulic assembly, and pressure testing | ISO 4413 for hydraulic system safety; pressure and leakage testing | Prevents loss of forming force, oil leakage, unstable positioning, and contamination-related failures | Check rod surface, seal leakage, pressure holding, hose routing, and cleanliness of hydraulic oil | High |
| Electrical Control Cabinet | Powder-coated steel enclosure with copper conductors and industrial-grade insulation materials | Mechanical protection, heat resistance, electrical insulation, and resistance to dust and moisture | Separated power and signal wiring, adequate ventilation, labeled terminals, cable glands, and spare capacity | IEC 60204-1; enclosure protection commonly selected using IEC 60529 IP ratings | Reduces electrical faults caused by vibration, overheating, dust ingress, and loose connections | Verify enclosure rating, cabinet temperature, grounding continuity, terminal tightness, and cable labeling | High |
| Gears, Couplings, and Gearboxes | Case-hardened or through-hardened alloy steel for gears; flexible couplings with replaceable elements | High tooth contact strength, core toughness, fatigue resistance, and tolerance to misalignment | Gear tooth grinding, controlled backlash, accurate alignment, sealed lubrication, and vibration-balanced rotating parts | ISO 6336 for gear load capacity; ISO 20816 for machine vibration evaluation | Improves torque transmission reliability and limits noise, pitting, tooth breakage, and shock damage | Check oil condition, gear backlash, tooth contact pattern, coupling wear, and operating vibration | Very High |
| Fasteners and Adjustment Hardware | High-strength alloy-steel bolts and corrosion-protected adjustment components | High preload capacity, fatigue resistance, thread durability, and resistance to loosening | Controlled tightening torque, locking devices, clean threads, hardened washers, and accessible service points | ISO 898-1 for carbon and alloy steel fastener mechanical properties | Maintains machine alignment and prevents loosening under vibration and cyclic forming loads | Check bolt grade markings, torque records, thread damage, locking method, and signs of fretting | High |
| Coolant and Lubrication Circuit | Stainless steel or protected carbon-steel piping with seals compatible with the selected fluid | Corrosion resistance, pressure stability, chemical compatibility, and resistance to temperature changes | Filtered circulation, accessible drains, protected hoses, leak-tested joints, and monitored fluid level | ISO 4413 principles for hydraulic fluid power systems; manufacturer fluid compatibility tests | Limits corrosion, abrasive contamination, heat accumulation, and premature bearing or roll wear | Inspect filters, hoses, fittings, fluid cleanliness, leaks, flow rate, and return-line condition | High |
| Protective Guards and Covers | Powder-coated carbon steel or stainless steel in corrosive or wet environments | Impact resistance, corrosion protection, safe access control, and dimensional stability | Rounded edges, rigid hinges, captive fasteners, inspection windows, and interlocked access doors where required | ISO 14120 for machinery guards; ISO 13857 for safety distances | Protects operators and internal components from chips, coolant, dust, and accidental contact | Check guard rigidity, hinge condition, interlock operation, coating quality, and unobstructed visibility | High |
| Corrosion Protection System | Multi-layer coating system: prepared steel substrate, primer, and industrial topcoat | Adhesion, resistance to humidity, chemical exposure, abrasion, and ultraviolet degradation | Controlled surface preparation, documented coating thickness, sealed welds, and protected machined surfaces | ISO 12944 for protective paint systems; coating thickness and adhesion tests | Reduces rust-related dimensional changes, structural weakening, and maintenance costs | Inspect coating thickness, edge coverage, weld areas, drain points, blistering, and exposed bare metal | High |