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Ingot and Hot-Metal Handling: Designing for Radiant Heat, Shock, and Scale

An ingot or hot-metal car is first a heavy, continuous-duty machine: it carries a dense load on every cycle and can run around the clock, and the heat radiating from that load then acts as a second design load on its bearings, wheels, seals, hydraulics, and cabling. UTEC Industrial designs, engineers, machines, fabricates, and installs custom material handling systems for aerospace and heavy industry from its Spokane Valley, WA facility, integrating Allen-Bradley PLC and motion control with in-house CNC machining, heat treating, and stress relief. This article works from the customer's hot product outward, through duty, radiant heat, bearings, hydraulics, cabling and sensing, set-down shock, thermal cycling, and oxide scale, and places each along the chain design → engineering → parts machining → fabrication → assembly → weld fatigue → stress relief → drives → controls → tuning → monitoring.

What makes an ingot or hot-metal car a heavy, continuous-duty machine before it is a hot one?​

A car that serves a casting floor, soaking pit, reheating furnace, or forge press moves heavy, dense product, and it moves it on a schedule set by the process rather than by the car. Every heat, every ingot, and every slab is one loaded cycle, so, as engineering reasoning, the car's frame, wheels, axles, and drive see fatigue loading for as long as the line runs. The International Labour Organization's code of practice for the iron and steel industry notes that steel is cast into slabs, billets, bars, ingots, and other shapes, and names road and rail vehicles used to transport raw materials, intermediates, products, waste, and people as internal transport, whose hazards can be caused by interaction between vehicles, between vehicles and other objects and personnel, or by loads falling off or from the vehicle.

For the duty basis, this article borrows from crane practice. CMAA Specification No. 70-2025 is CMAA's specification for top-running bridge and gantry type multiple-girder electric overhead traveling cranes, and its 2025 commentary covers duty classes; AIST Technical Report No. 6-2018 is the specification for electric overhead traveling cranes for steel mill service. In this article's reading, neither governs a floor car; both give a published way to state duty. The wheel loads, rail selection, and drive and brake sizing that follow from the duty are worked through in the rail-guided transfer car design article. Heat then changes the answer for the parts closest to the load (International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §2.1.5, §13.1.1, and §13.1.2; CMAA Specification No. 70-2025; AIST Technical Report No. 6-2018).

How does radiant heat become a design load on the car rather than only an operator hazard?​

Radiant heat travels in straight lines from the hot surface, so anything on the car that can "see" the ingot or the furnace opening receives it: the deck, the frame's top flanges, wheel bearings near the deck edge, hydraulic hoses, sensors, and cable. The ILO code orders its measures for workers at risk from radiant heat near hot surfaces, and this article uses the same order as a design sequence for the car's components:

  1. Distance. Increase the distance between the hot surface and what must be protected.
  2. Reduce the source. When distance is not practicable, lower the surface temperature by changing plant operating temperatures, insulate the surface, or reduce its emissivity.
  3. Barriers. Where the surface temperature cannot be reduced, the code lists these options: place radiation barriers of low conductivity and high emissivity between the surface and the protected item, and keep them clean.
  4. Cooling. Water-cool the hot surfaces where practicable.
  5. Portable shielding. Use portable reflective shielding.
  6. Remote operation. Arrange for remote control operations.

As engineering reasoning, steps 1 and 3 fit a car best: bearings, the drive, the hydraulic power unit, and junction boxes go below or behind the deck and are screened from the load by a replaceable heat shield. The code's clause on keeping barriers clean matters, in this article's reading, because a shield caked with scale and dust changes its surface. Water cooling on a car needs care: the code also says molten slag and metal should be kept from contact with water, which will cause a steam explosion. Where the car carries or approaches molten metal, this article reads the code's internal-transport clause on lifting devices (steel not prone to hydrogen embrittlement, shielded from radiant heat) as reaching the tongs and hooks that load it, which the ingot, slab, billet, and coil equipment article covers (International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §5.2.3.3.2.2, §5.2.3.3.2.3, §7.6.1, and §13.2.2.12).

Which wheel and axle bearing limits does radiant heat reach first?​

The wheel bearings on a heavy car can be large rolling bearings, and their temperature limit is set by more than the steel. SKF's catalog for its spherical roller bearings, a type the same catalog also shows in rail-wheel service, says their permissible operating temperature can be limited by three things: the dimensional stability of the bearing rings, the seals, and the lubricant. The same catalog gives values for each:

  • Rings. SKF spherical roller bearings are heat stabilized up to at least 200 °C (390 °F).
  • NBR seals. −40 to +90 °C (−40 to +195 °F), with up to 120 °C (250 °F) tolerated for brief periods.
  • HNBR seals. −40 to +150 °C (−40 to +300 °F).
  • FKM seals. −30 to +200 °C (−20 to +390 °F).

SKF notes that temperature peaks typically occur at the seal lip, and that grease temperature limits are listed separately. Read together, and as engineering reasoning rather than an SKF statement, these numbers suggest why a bearing near hot product reaches its seal or grease limit long before its ring limit: a standard NBR seal reaches its limit at less than half the ring stabilization temperature. SKF also warns that FKM seals exposed to an open flame or to temperatures above 300 °C (570 °F) are a health and environmental hazard and remain dangerous after cooling, which belongs in the maintenance procedure for any car that has been through a fire or a spill. These are one manufacturer's figures for one bearing family; the specifying engineer takes the actual limits from the bearing and seal supplier for the chosen part (SKF PUB BU/P2 18406 EN, Temperature limits).

How do grease, clearance, and low speed fail bearings near hot product?​

A hot-metal car's wheels can turn slowly and stop often, and a car parked at a furnace door may sit still in the heat. SKF's high-temperature bearing publication lists common issues for bearings in high-temperature applications:

  • Inadequate lubrication. At high temperature, grease or oil becomes very thin, and too-thin oil at low rotational speed allows metal-to-metal contact, which causes wear, noise, and excessive play.
  • Short grease life. Grease ages rapidly at high temperature, so relubrication must be very frequent. Frequent relubrication also creates the risk of over-filling the bearing, and excess grease can contaminate the process and possibly catch fire.
  • Carbonized grease. Old grease left in the bearing can carbonize and block it.
  • Loss of internal clearance. Above the bearing's stabilization temperature, thermal expansion and structural changes can cause an uncontrolled loss of internal radial clearance and, ultimately, a seized bearing.

SKF's answer for its own range is graphite-based lubrication with a special radial clearance, with variants capable of performing at temperatures as high as 350 °C (660 °F), and it notes that graphite-lubricated bearings must be kept dry because they have very limited protection against corrosion. Its cooling-bed case study, SKF's own claim, reports grease-lubricated deep groove ball bearings replaced with high-temperature bearings, 5,000 installed, and bearing service life rising from six months to more than six years. The scope matters: that publication covers deep groove ball bearings, insert bearings, and ball bearing units, not heavy car wheel bearings. For the car, the transferable lessons are the failure modes, and applying them to wheel bearings is engineering reasoning rather than SKF guidance: specify the grease for the bearing's real temperature, keep the relubrication interval realistic, and size clearance for the hot condition (SKF PUB BU/P2 14961/3 EN, pp. 3-4, 6, and 10).

How should hydraulics on a hot-metal car be protected from fire?​

Many cars carry hydraulics for lift tables, tilting cradles, clamps, or rail brakes, and a hydraulic leak sprayed toward hot product is a fire source. FM Approvals, whose examination standards serve property conservation, certifies industrial fluids for fire performance. Its Class Number 6930 states testing and certification requirements for the fire performance of industrial fluids used in industrial equipment systems, and its scope covers lubricants and hydraulic power transmission fluids among others. Its Spray Flammability Parameter measures the fluid's flammability in a highly atomized, pressurized condition, and its tests are intended to simulate conditions that may occur while the fluid is in use: a fluid with a fire point is eligible for FM Approval only when its normalized Spray Flammability Parameter is 5 × 10⁴ or less.

Two points in the standard reach the car's maintenance plan directly:

  • Contamination voids approval. A certified fluid used in an application that allows contamination with fluids that are not certified is not eligible, and such use voids the certification for that lot or batch. In this article's reading, topping up a car's reservoir from the plant's general hydraulic oil drum undoes the protection.
  • Scope limits. The standard evaluates only the fire hazards it investigates; toxicity and the suitability of the fluid for the end use are not evaluated, so compatibility with seals, pumps, and valves is a separate check with the component suppliers.

ISO 4413:2010 specifies general rules and safety requirements for hydraulic fluid power systems and components used on machinery as defined by ISO 12100. Beyond the fluid, and as engineering reasoning rather than a cited rule, keep the power unit out of the radiant path, screen hoses that must run near it, and route them so a burst does not spray toward the load. No source in this library gives hose temperature values; they come from the hose manufacturer's data for the specific hose (FM Approvals Class Number 6930, §1.1, §1.2, and §4.5; ISO 4413:2010).

How are cables, sensors, and enclosures kept working under radiant heat?​

As engineering reasoning, cable, connectors, and sensors can be among the lowest-temperature-rated parts on a hot-metal car, and a heat-damaged cable can show up as intermittent faults before it fails outright. Two separate ratings apply to every electrical item, and they are easy to confuse:

  • Ingress rating. IEC 60529:1989+AMD1:1999+AMD2:2013 applies to the classification of degrees of protection provided by enclosures for electrical equipment with a rated voltage not exceeding 72.5 kV (the IP code), and ANSI/NEMA 250-2020 covers NEMA enclosure types for electrical equipment rated not more than 1000 V, with an annex table that converts NEMA type ratings to IP designations. These ratings address protection against environmental conditions such as dust and water, which a hot, scaly mill has plenty of.
  • Temperature rating. The ambient range is a separate line on the data sheet. A laser distance sensor used for car positioning illustrates the point: SICK's DL100 Pro is rated IP65 for an ambient of −20 to +55 °C, reaches +75 °C only in an optional cooler housing, and that cooler housing is rated IP55 horizontal or IP54 vertical. SICK's instructions also say the device must not be used under extreme ambient conditions.

So a sensor that is correctly rated for washdown can still be the wrong choice beside a furnace door. As engineering reasoning, the practical measures are the ones in the radiant-heat sequence above: distance, shielding, and placement below the deck line. IEC 60204-1:2016 applies to electrical, electronic and programmable electronic equipment and systems to machines not portable by hand while working, and NFPA 70-2026 is the National Electrical Code for the installation. Cable temperature is engineering judgment here, not a cited value: the ratings come from the cable manufacturer. The power-delivery options (cable reel, festoon, conductor bar, battery) are compared in the transfer car design article (IEC 60529:1989+AMD1:1999+AMD2:2013 CSV; ANSI/NEMA 250-2020, Annex A; SICK 2025, DL100 Pro Operating Instructions 8024484, Tables 55 and 58, §2.3; IEC 60204-1:2016; NFPA 70-2026).

How do set-down shock and impact load the deck and frame?​

Ingots, slabs, and blooms are placed on a car by crane, manipulator, charging machine, or pusher, and the deck takes an impact every time a piece lands harder than it should. That impact is a load cycle on the deck supports, the frame's welded joints, and every wheel, axle, and bearing beneath. The ILO code's lifting rules point to the control measure: loads should be lowered slowly and smoothly, and its crane clauses give an example of a lowering speed of not more than 20 cm/s. In this article's reading, a set-down speed limit enforced by the crane or loader's drive is part of the car's protection, not only the crane's.

On the car itself, design responses, as engineering reasoning, include:

  • Replaceable wear and impact surfaces. Saddles, skid rails, or deck plates that take the impact are bolted rather than welded to the primary frame, so they can be changed without cutting into the structure.
  • Load spreading. Deck supports sit over frame webs and wheel lines so a set-down load has a short path to the rail.
  • Fatigue-rated weld details. Every set-down cycles the welds at supports, wheel mounts, and axle housings, so those details are designed for fatigue, not just static strength.

AIST Technical Report No. 6-2018, the specification for electric overhead traveling cranes for steel mill service, is a benchmark this article borrows for that duty environment. On the rail side, Ricker's review of crane runway problems says the cyclical movement from crane-beam deflection causes fatigue stresses, and that rail splices allowed to open up leave the rail ends subject to a hammering action from the wheels; reading that as the same mechanism is engineering reasoning. UTEC Industrial stress-relieves and machines the welded frame of a transfer car before assembly, so the wheel-mount faces and bearing bores stay aligned after welding (International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §5.4.4.21 and §13.2.2.7; AIST Technical Report No. 6-2018; Ricker 1982).

What does repeated heating and cooling do to a car deck that carries hot product?​

A deck that receives a hot ingot, carries it, and returns empty is heated locally and then cooled on every cycle. No free primary source in this library gives design values for thermal fatigue of car decks, so this answer stays qualitative, and the reasoning below is engineering judgment rather than a cited rule:

  • Distortion. The heated top plate expands while the cooler frame below restrains it. Repeated cycles can leave the deck bowed, which shifts the load path and unloads some supports.
  • Thermal fatigue cracking. Cyclic thermal strain concentrates at weld toes, plate edges, and changes in section, the same places mechanical fatigue starts.
  • Loss of fit. Bolted wear plates and supports loosen as the plate grows and shrinks around them.

The design responses follow from the mechanism: keep the hot product off the primary structure with sacrificial supports or an insulating layer, let the deck plate move relative to the frame with slotted or floating attachments, and keep welds out of the hottest zone. ANSI/AISC 360-22 provides the generally applicable requirements for the design and construction of structural steel buildings and other structures and incorporates both LRFD and ASD methods; in this article it is a reference rather than a governing code for a car frame. Where the deck temperature is expected to be high enough to reduce steel strength, the designer takes elevated-temperature properties for the actual plate grade from the steel supplier and states them in the design basis. Plate selection for shock- and heat-loaded decks is a Custom Engineering & Fabrication topic (ANSI/AISC 360-22).

Where does oxide scale come from, and what does it do to the car and its track?​

Hot steel oxidizes in air. Chen and Yuen's review of the high-temperature oxidation of iron and carbon steels reports that iron oxidizing in air or oxygen above 700 °C follows the parabolic law and forms a three-layer scale of wüstite, magnetite, and hematite; that on carbon steel, for longer-time oxidation, the less adherent scale typically develops much more complex structures; and that under continuous cooling the final scale structure depends on the temperature at which cooling starts and the cooling rate. The ILO code adds the hazard view: in hot rolling, burns and eye injuries can come from flying mill scale and dust.

For a car, loose scale is debris with three consequences, and the list below is engineering reasoning from those sources:

  • Rail and wheel. Scale on the rail head can lift a wheel flange or act as an abrasive between tread and rail. The rail sweep and drained rail channel described in the transfer car design article are one defense.
  • Deck and supports. Scale builds up under the product, changes the contact points, and abrades wear surfaces.
  • Sensors and seals. Scale and dust foul reflectors, sensor windows, and bearing seals, and build up on heat shields.

The code's rule that vehicles should be kept clean and tidy, with critical faults reported immediately, is, in this article's reading, the maintenance side of the same problem. A scale-cleaning interval belongs in the car's maintenance plan from the start (Chen and Yuen 2003; International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §10.1.7 and §13.2.2.9).

Which molten-metal and internal-transport rules does a hot-metal car inherit?​

Where the car carries a ladle, charges a furnace, or runs beside a casting floor, this article reads the molten-metal rules as reaching it. The ILO code's internal-transport rules on collision-safe routes, posted speed, workstations kept out from under the path of molten material, operator visibility, and rail stops for track work are set out clause by clause in the molten- and hot-metal handling rules article, and the steel, foundry, and aluminum plant overview covers aluminum sow and ingot charging. Two points change the car's own design:

  • Water. Molten slag and metal should be kept from contact with water, which will cause a steam explosion; as engineering reasoning, any water-cooled component on the car, and any cooling line along its route, is a leak source to be justified.
  • Visibility on a remote car. A vehicle should not move unless the operator has a clear field of view in the direction of travel, to the rear, above, and to either side, or is in communication with another person who does; on a remotely operated car, this article's answer is cameras and presence sensing to supply that view.

For aluminum, the Aluminum Association's Guidelines for Aluminum Sow Casting and Charging, 3rd edition, were published to help prevent injuries, fatalities, and equipment damage from explosions caused by wet, cold, or contaminated cast being charged into molten aluminum in melting furnaces; in this article's reading, a charging car's staging area is part of that scheme (International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §7.6.1, §13.2.2.1, §13.2.2.4, §13.2.2.6, §13.2.2.13, §13.2.2.16, and §13.2.2.17; The Aluminum Association 2024, Guidelines for Aluminum Sow Casting and Charging, 3rd ed.).

What sensing, controls, and interlocks does a hot-metal car need?​

The intelligence layer on a hot-metal car does the same jobs as on any automated car, docking, interlocking, and stopping, but each device has to survive the heat or be placed where the heat does not reach. The heat-specific items are:

  • Position sensing out of the radiant path. Absolute position from a laser distance sensor or a measuring-wheel encoder lets the car dock without relying on driven-wheel counts. A laser sensor's ambient limit (for the SICK DL100 Pro, +55 °C, or +75 °C in the cooler housing) can, as engineering reasoning, put the sensor at the cool end of the track with the reflector on the car. The manufacturer also states that the device does not constitute a safety component, so this article gives overtravel and zone protection their own safety-rated channel.
  • Temperature monitoring. Bearing housing, hydraulic oil, and cabinet temperatures, trended in the PLC, can show a failing shield or a dry bearing before the car stops in a furnace doorway.
  • Permissives. The car should not move to a furnace until the door is confirmed open and should not dwell in the doorway longer than the heat exposure the components are rated for; a dwell timer in the PLC enforces that.
  • Remote operation. Remote control operations are one of the ILO code's radiant-heat measures; on a car, this article applies them by moving the operator to a shielded pulpit or out of the bay.
  • Drives and logic. A VFD or servo drive can ramp the travel motors. Allen-Bradley Kinetix 5700 inverters support DSL and Hiperface encoder feedback and feature a safe torque-off function, and their axis configurations include position loop, velocity loop, and torque loop, with a current regulator loop. Logix 5000 controller tasks can be configured as continuous, periodic, or event, and a periodic task executes automatically based on a preconfigured interval, so interlock and dwell logic can run at a fixed period.
  • Safety standards. ISO 12100:2010 specifies principles of risk assessment and risk reduction for achieving safety in the design of machinery; ISO 13849-1:2023 specifies a methodology and provides related requirements, recommendations and guidance for the design and integration of safety-related parts of control systems that perform safety functions, in high demand and continuous modes of operation; IEC 60204-1:2016 applies to the machine's electrical equipment.

UTEC Industrial, a Rockwell Automation Recognized System Integrator, builds the Allen-Bradley PLC, VFD, and servo control for the cars it supplies and builds the control panels to UL 508A (SICK 2025, DL100 Pro Operating Instructions 8024484, §2.3 and Tables 55 and 58; International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §5.2.3.3.2.3; Rockwell Automation 2198-UM002E-EN-P, Kinetix 5700; Rockwell Automation 1756-RM094N-EN-P-2025; ISO 12100:2010; ISO 13849-1:2023; IEC 60204-1:2016).

How are hot-metal cars tuned, maintained, and made safe for service?​

A car that runs hot needs a maintenance plan written around heat, and a tuning plan written around load. A car tuned on an empty deck can overshoot its docking point carrying a full ingot, and the Kinetix 5700 commissioning procedure repeats its Test and Tune step for each axis and states that actual bandwidth values depend on the application and can require adjustment once motor and load are connected. In this article's practice, tuning is checked at full load and rechecked when the product mix changes.

Maintenance and isolation carry two lessons:

  • Shift checks. The ILO code says the operator of a vehicle should check it at the start of each shift, and a record should be kept. On a hot-metal car, this article extends that check to shields, hose screens, scale build-up, and bearing temperatures.
  • Energy control and support. Under OSHA's lockout/tagout standard, push buttons, selector switches, and other control-circuit devices are not energy-isolating devices, and after lockout all potentially hazardous stored or residual energy must be relieved, disconnected, restrained, and otherwise rendered safe; in this article's reading, a raised lift table, a charged accumulator, and a car on a slight grade all count. The NIOSH coil-cart fatality, and this library's lessons from it for designed-in support, are described in Positioning Accuracy and Interlocks on Automated Transfer Cars.

UTEC Industrial performs factory acceptance testing and on-site commissioning, so heat-exposure checks and loaded tuning can be written into the purchase order and demonstrated at both stages (Rockwell Automation 2198-UM002E-EN-P, Kinetix 5700; International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §13.2.2.15; OSHA 29 CFR 1910.147-1989).

What should a specifying engineer define for an ingot or hot-metal car?​

As engineering reasoning, hot-metal car problems can trace back to a specification that described the load's weight but not its temperature, set-down method, or environment. A complete request defines:

  • Product. Heaviest and lightest pieces, footprint, and surface temperature at pickup and at set-down.
  • Duty. Cycles per hour, hours per day, dwell time at each station, and dwell time in any furnace doorway.
  • Loading method. Crane, manipulator, charging machine, or pusher, with the maximum set-down speed the loader can guarantee.
  • Heat exposure. Distance from the hot surface to the deck, frame, bearings, hydraulics, and cabling, and whether the car enters a furnace or only approaches one.
  • Scale, water, and molten metal. Expected scale load, water sources on the route, and whether the car carries or passes molten metal.
  • Fluids and components. Whether an FM-approved hydraulic fluid is required, and the bearing, seal, and grease temperature limits the supplier must meet.
  • Controls. Positioning tolerance, remote-operation requirements, temperature monitoring points, and the safety functions identified by the risk assessment.
  • Proof. Factory and site acceptance tests at full load, including stopping distance and interlock checks.

The ILO code lists insufficient strength of materials and inappropriate design of machines among its particular areas of concern for work equipment, alongside a lack of guards or inadequate guards and the lack of interlocks. In this article's reading, a specification that states the heat, shock, and scale loads is how those failures are addressed at the design stage rather than discovered in service (International Labour Organization 2005, Code of Practice on Safety and Health in the Iron and Steel Industry, §5.4.3.1.1; FM Approvals Class Number 6930, §4.5; ISO 12100:2010).

Related Articles

References​

  • AIST Technical Report No. 6-2018: Specification for Electric Overhead Traveling Cranes for Steel Mill Service. Association for Iron and Steel Technology, 2018.
  • ANSI/AISC 360-22: Specification for Structural Steel Buildings. American Institute of Steel Construction, 2022.
  • ANSI/NEMA 250-2020: Enclosures for Electrical Equipment (1000 Volts Maximum). National Electrical Manufacturers Association, 2020.
  • Chen RY, Yuen WYD (2003). "Review of the High-Temperature Oxidation of Iron and Carbon Steels in Air or Oxygen." Oxidation of Metals, 59, 433-468.
  • CMAA Specification No. 70-2025: Specifications for Top Running Bridge and Gantry Type Multiple Girder Electric Overhead Traveling Cranes. CMAA, 2025.
  • FM Approvals Class Number 6930: Examination Standard for Fire Performance of Industrial Fluids. FM Approvals LLC, 2025.
  • IEC 60204-1:2016 (Ed. 6.0): Safety of Machinery -- Electrical Equipment of Machines -- Part 1: General Requirements. International Electrotechnical Commission, 2016.
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  • ISO 4413:2010: Hydraulic fluid power — General rules and safety requirements for systems and their components. International Organization for Standardization, 2010.
  • NFPA. NFPA 70-2026: National Electrical Code (NEC). National Fire Protection Association, 2026.
  • OSHA 29 CFR 1910.147-1989: The Control of Hazardous Energy (Lockout/Tagout). Occupational Safety and Health Administration, 1989.
  • Ricker DT (1982). "Tips for Avoiding Crane Runway Problems." Engineering Journal (AISC), 19(4), 181-205. DOI 10.62913/engj.v19i4.388
  • Rockwell Automation 1756-RM094N-EN-P-2025: Logix 5000 Controllers Design Considerations. Rockwell Automation, 2025.
  • Rockwell Automation 2198-UM002E-EN-P (2018): Kinetix 5700 Servo Drives User Manual. Rockwell Automation, 2018.
  • SICK 8024484: DL100 Pro PROFINET/SSI Distance Sensor: Operating Instructions. SICK AG, 2025.
  • SKF PUB BU/P2 14961/3 EN: SKF High Temperature Bearings: For Operating Temperatures up to 350 °C (660 °F). SKF Group, 2019.
  • SKF PUB BU/P2 18406 EN: Spherical Roller Bearings. SKF Group, 2019.
  • The Aluminum Association. Guidelines for Aluminum Sow Casting and Charging, 3rd ed. The Aluminum Association, 2024.

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