Rolling Mill Rolls: Work Roll and Backup Roll Material Selection, Hardness, and Failure Mode Guide

In a rolling mill, the rolls are simultaneously the most critical and the most consumed components. A work roll in a hot strip finishing stand may roll 3,000–8,000 tonnes of steel before it is pulled from the mill for regrinding. A backup roll in the same mill may last 6–18 months before it requires a major regrind. But when a roll fails prematurely — through spalling, fire-cracking, or fracture — the consequences extend far beyond the cost of the roll itself: unplanned mill downtime, strip surface defects that trigger customer rejections, damage to adjacent rolls and mill housing components, and the logistical disruption of an unscheduled roll change. In high-output hot strip mills, a single unplanned roll change can cost USD 50,000–200,000 in lost production.

The root cause of the majority of premature roll failures is not manufacturing defect. It is a mismatch between the roll material and the actual service conditions of the stand — incorrect hardness for the thermal and mechanical loading, insufficient toughness for the impact loading of the pass, or a material grade that cannot survive the thermal cycling of the cooling water and hot strip contact. This guide provides the systematic technical framework for selecting the correct roll material for each stand position, understanding the hardness parameters that govern wear and fracture resistance, and diagnosing the failure modes that indicate a material or process mismatch.

Part 1: The Functional Requirements of Rolling Mill Rolls

Before selecting a roll material, it is essential to understand what the roll is actually required to do — and why no single material can satisfy all requirements simultaneously.

1.1 The Five Competing Requirements

A rolling mill work roll must simultaneously:

1. Withstand high contact pressure — contact stress between the work roll and the strip in hot strip finishing stands typically exceeds 800–1,200 MPa; in cold strip mills it can reach 1,500–2,500 MPa. The roll material must have sufficient compressive strength and hardness to resist plastic deformation of the roll surface under these pressures.

2. Resist cyclic thermal shock — in hot rolling, the roll surface is heated to 400–700°C by contact with the hot strip, then immediately quenched by cooling water. This thermal cycling generates cyclic thermal stresses at the roll surface, causing thermal fatigue cracks (fire cracks) if the material has insufficient thermal crack resistance.

3. Maintain surface hardness and roughness over the campaign — the roll surface must maintain consistent hardness and surface roughness over hundreds to thousands of tonnes rolled per campaign. Rapid wear changes the roll profile, affecting strip flatness and dimensional accuracy.

4. Avoid surface defects — heat checking, spalling, fire-cracks, and banding marks on the roll surface transfer directly to the strip surface, causing product quality failures and customer rejections.

5. Provide sufficient fracture safety margin — the roll must not fracture catastrophically under the bending and torsional loads of the rolling process. A fractured roll in a hot strip mill is a catastrophic event that can damage the mill housing, adjacent rolls, and strip guides.

1.2 The Fundamental Trade-off: Hardness vs. Toughness

The central challenge in roll material selection is that hardness (wear resistance) and toughness (fracture resistance) are inversely related in most materials. Increasing the carbon and alloy content to raise hardness reduces the fracture toughness. This means:

• Roughing stands — large reductions, high impact loads, severe thermal shock → prioritize toughness over hardness → use lower-hardness, tougher materials

• Finishing stands — smaller reductions, lower impact loads, but extreme surface quality requirements → prioritize hardness and wear resistance → use higher-hardness materials

• Cold mill work rolls — no thermal shock, but extreme contact pressures → prioritize very high hardness and fatigue strength → use forged alloy steel with deep hardening

This stand-specific variation in requirements is why a rolling mill uses different roll materials in different stands — there is no universal roll material that optimally serves all positions.

Part 2: Roll Manufacturing Methods — Forged vs. Cast

2.1 Forged Rolls

Forged rolls are produced by open-die forging of a steel ingot, followed by heat treatment (quenching and tempering, or differential hardening). The forging process:

• Refines the grain structure — breaks down the coarse cast ingot structure, producing a fine, uniform grain

• Eliminates internal porosity — forging closes shrinkage voids and gas pores that are inherent in cast ingots

• Provides directional strength — the grain flow follows the roll shape, maximizing strength in the axial direction (critical for bending resistance)

• Enables deep, uniform hardening — forged rolls can be through-hardened or differentially hardened (hard surface, tough core) with excellent uniformity

Forged rolls are the standard for:

• Backup rolls (all mill types) — the extreme bending loads require the fracture toughness that only forging can provide

• Hot strip mill roughing stand work rolls — high impact loads require forged toughness

• Cold mill work rolls — extreme contact pressures require the clean, defect-free structure of forged steel

• High-load plate mill work rolls

Typical forged roll materials:

2.2 Cast Rolls

Cast rolls are produced by pouring molten metal into a mold. The casting process allows more flexibility in composition and geometry than forging, and is generally lower cost for large-diameter rolls. Cast rolls are produced by:

• Sand casting — for large, complex shapes; lower dimensional accuracy

• Centrifugal casting — the standard for high-quality cast rolls; the centrifugal force during casting drives dense carbides to the outer layer (shell) while the inner core solidifies with a tougher, lower-carbide structure. This produces a natural composite structure — hard wear-resistant shell over a tough core.

Cast roll types and applications:

2.3 Forged vs. Cast — When to Choose Which

Part 3: Stand-Specific Material Selection

3.1 Hot Strip Mill (HSM) — Work Roll Selection by Stand

The hot strip mill is the most demanding environment for work rolls, combining high contact temperatures (strip entry temperature 1,050–1,150°C at roughing, 850–950°C at finishing exit), high rolling forces, and aggressive water cooling.

Roughing Stands (R1–R2):

• Strip temperature: 1,050–1,150°C

• Rolling force: Very high (up to 40–60 MN)

• Impact loading: Severe (scale, crop ends, cobbles)

• Priority: Fracture resistance and thermal crack resistance over wear resistance

• Recommended material: Forged Cr2 or Cr3 steel, or high-strength cast steel

• Hardness: HS 40–55 (350–480 HB)

• Rationale: The extreme impact loads from scale and crop ends at roughing stands make fracture resistance the overriding requirement. A harder roll that provides better wear resistance but lower toughness will fracture under these conditions.

Finishing Stands F1–F3 (Entry Finishing):

• Strip temperature: 950–1,050°C at entry

• Rolling force: High (20–40 MN)

• Impact loading: Moderate

• Priority: Balance between wear resistance and thermal crack resistance

• Recommended material: High chromium cast iron (centrifugal) or Semi-HSS forged

• Hardness: HS 65–75 (540–620 HB)

• Rationale: The entry finishing stands see high thermal loads from the hot strip but lower impact than roughing. High chromium cast iron provides the wear resistance needed for acceptable campaign life while maintaining sufficient thermal crack resistance.

Finishing Stands F4–F7 (Exit Finishing):

• Strip temperature: 850–950°C

• Rolling force: Moderate (10–20 MN)

• Impact loading: Low

• Priority: Maximum wear resistance and surface quality

• Recommended material: High speed steel (HSS) — cast or forged

• Hardness: HS 75–90 (620–720 HB)

• Rationale: The exit finishing stands determine the final strip surface quality and dimensional accuracy. HSS rolls provide 3–5× longer campaign life than high chromium rolls in these stands, reducing roll change frequency and improving strip surface consistency. The lower impact loading at exit stands makes the lower toughness of HSS acceptable.

3.2 Hot Strip Mill — Backup Roll Selection

Backup rolls in a hot strip mill do not contact the strip — they support the work rolls and transmit the rolling force through the mill housing. Their requirements are fundamentally different from work rolls:

• Primary requirement: Resistance to bending fatigue — the backup roll is a large beam loaded by the rolling force, and must resist cyclic bending without fatigue cracking

• Secondary requirement: Resistance to contact fatigue at the work roll/backup roll interface — the contact stress between the work roll and backup roll can reach 600–900 MPa

• Hardness: HS 55–70 (460–580 HB) — lower than work rolls, optimized for toughness

• Material: Forged Cr-Ni-Mo or Cr5 steel — the superior fracture toughness of forged steel is essential for backup rolls

Backup roll dimensions are typically:

• Barrel diameter: 1,200–1,800mm (hot strip mill)

• Barrel length: 1,800–2,200mm

• Total roll weight: 60–150 tonnes

At this scale, the forging quality — particularly the absence of internal defects and the uniformity of the hardness from surface to core — is critical. Backup rolls are 100% ultrasonically tested after forging and heat treatment.

3.3 Cold Rolling Mill — Work Roll Selection

Cold rolling imposes fundamentally different requirements on work rolls compared to hot rolling:

• No thermal shock — strip enters at room temperature

• Extreme contact pressures — 1,500–2,500 MPa in cold strip finishing

• Very high surface quality requirements — cold rolled strip surface quality is directly determined by the roll surface condition

• High rolling speeds — up to 25 m/s in tandem cold mills

Cold mill work roll requirements:

• Very high hardness: 60–66 HRC (forged high-alloy steel) — necessary to resist plastic deformation under the extreme contact pressures

• Excellent surface finish: Ra < 0.1 μm after grinding — the roll surface finish transfers directly to the strip

• High fatigue strength: The roll must resist contact fatigue (pitting) under millions of loading cycles per campaign

• Low elastic flattening: High elastic modulus maintains the roll profile under load

Recommended material: Forged high-alloy steel (2% C, 12% Cr, Mo, V) — this grade provides the combination of very high hardness, good fatigue strength, and sufficient toughness for cold mill service.

Cold mill backup roll requirements:

• Hardness: 60–75 HSC (300–420 HB) — lower than work rolls, optimized for bending fatigue resistance

• Material: Forged Cr-Ni-Mo steel with deep, uniform hardening

• Critical requirement: The hardness must be uniform from the surface to a depth of at least 100–150mm, to ensure the backup roll maintains its load-bearing capacity after multiple regrinding cycles.

3.4 Wire Rod and Bar Mill Roll Selection

Wire rod and bar mills present a different challenge: the rolls are smaller (typically 200–600mm diameter), rotate at very high speeds (up to 100 m/s in finishing blocks), and must maintain precise groove geometry over the campaign.

Roughing and intermediate stands:

• High impact loading from billet entry and scale

• Recommended: Cast steel or ductile iron (SG iron)

• Hardness: HS 35–55 (300–480 HB)

Finishing stands:

• High speed, precision groove geometry required

• Recommended: High chromium cast iron or tungsten carbide roll rings

• Hardness: HS 65–80 for high chromium; 1,400–1,600 HV for tungsten carbide

Tungsten carbide roll rings are the premium choice for high-speed wire rod finishing blocks:

• Wear resistance 10–20× higher than high chromium cast iron

• Elastic modulus 3× higher than steel — minimal elastic flattening maintains groove geometry

• Limitation: Very low fracture toughness — must be used in a steel sleeve (composite roll) and cannot withstand cobbles or severe impact loading

Part 4: Hardness Measurement and Conversion for Rolling Mill Rolls

4.1 Hardness Scales Used in Roll Specification

Rolling mill rolls use multiple hardness scales depending on the roll type and hardness level:

Approximate conversions (for reference only — exact values depend on material):

4.2 Hardness Gradient — The Critical Parameter

For differentially hardened rolls (hard surface, tough core), the hardness gradient from the surface to the core is as important as the surface hardness. The hardness gradient determines:

• Effective hardened depth — how many regrinding cycles the roll can undergo before the hardened layer is consumed

• Subsurface stress distribution — the transition from hard surface to soft core creates a stress concentration zone where subsurface fatigue cracks can initiate

• Spalling risk — if the hardened layer is too thin or the hardness drop is too abrupt, the subsurface stress concentration promotes spalling

Typical hardness gradient requirements:

Part 5: Contact Stress and Roll Strength Calculation

5.1 Hertzian Contact Stress at the Roll/Strip Interface

The contact between a cylindrical roll and the flat strip surface is a Hertzian line contact problem. The maximum contact pressure (peak Hertzian stress) is:

Where:

= rolling force (N)

= barrel length in contact (m)

= reduced elastic modulus:

(for steel-steel:

)

= reduced radius:

(for roll on flat strip:

)

Example: 700mm diameter work roll, 1,600mm barrel, 20 MN rolling force:

This contact pressure must be below the material's contact fatigue limit (

) to avoid pitting and spalling. For HSS rolls,

; for high chromium cast iron,

.

5.2 Roll Bending Stress

The backup roll (and to a lesser extent the work roll) acts as a beam loaded by the rolling force distributed along the barrel length and supported at the roll neck bearings. The maximum bending stress at the roll barrel surface is:

Where

is the maximum bending moment (N·mm) and

is the barrel diameter (mm).

For a backup roll with rolling force

applied at the barrel center and supported at the neck centers (span

):

The bending stress must be below the material's endurance limit — typically 250–400 MPa for forged Cr-Ni-Mo backup roll steel. A safety factor of 4–5 against the endurance limit is standard practice for backup roll design.

Part 6: Roll Failure Mode Analysis

Understanding the failure mode is essential for identifying the root cause and selecting the correct corrective action. The same visual appearance can have different root causes.

6.1 Spalling

Appearance: Large pieces of the roll surface break away, typically in a roughly circular or elliptical pattern. The spall depth is typically 5–30mm.

Mechanism: Subsurface fatigue crack initiation at the maximum shear stress depth (typically 2–10mm below the surface for Hertzian contact), followed by crack propagation parallel to the surface, eventually connecting to the surface and releasing a spall fragment.

Root causes:

• Overloading: Rolling force exceeds the roll's contact fatigue limit — the most common cause

• Thermal shock: Sudden cooling (cooling water on a hot roll, or strip cobble causing local overheating) creates tensile thermal stresses that initiate subsurface cracks

• Pre-existing subsurface defects: Inclusions, segregation bands, or hydrogen flakes in the roll material act as crack initiation sites

• Insufficient hardened depth: If the hardened layer is consumed by regrinding, the softer subsurface material cannot resist the contact stresses

Corrective action:

• Verify rolling force does not exceed the roll's rated contact fatigue limit

• Check roll material cleanliness (UT inspection of new rolls)

• Verify hardened depth is adequate for the remaining roll diameter

• Review cooling water flow and distribution

6.2 Fire Cracking (Thermal Fatigue Cracking)

Appearance: Network of fine surface cracks (heat checking) in a roughly hexagonal pattern, typically 0.5–3mm deep. In severe cases, the cracks propagate deeper and can lead to spalling.

Mechanism: Cyclic thermal stresses from repeated heating (hot strip contact) and quenching (cooling water) generate cyclic tensile stresses at the roll surface during the cooling phase. These stresses exceed the material's thermal fatigue limit, initiating surface cracks.

Root causes:

• Insufficient cooling water flow: Inadequate cooling allows the roll surface temperature to rise excessively

• Cooling water distribution problems: Uneven cooling creates thermal gradients along the barrel

• Material with low thermal crack resistance: High-hardness materials (HSS, high chromium) have lower thermal crack resistance than tougher materials

• Excessive campaign length: Fire cracks are cumulative — a roll that is not reground frequently enough accumulates deep fire cracks

Corrective action:

• Verify cooling water flow rate and distribution across the barrel

• Reduce campaign length (regrind more frequently) for stands with high thermal loading

• Consider switching to a material with better thermal crack resistance (e.g., from cast HSS to forged Semi-HSS) if fire cracking is persistent

6.3 Banding / Groove Marks

Appearance: Circumferential bands or grooves on the roll surface, typically at regular intervals corresponding to the strip edge position or a specific strip width.

Mechanism: The strip edges create a stress concentration at the edge contact zone. Over many rolling cycles, the repeated contact at the strip edge position causes preferential wear or fatigue damage, creating a visible band or groove.

Root causes:

• Rolling the same strip width repeatedly — the strip edge always contacts the same position on the roll barrel

• Insufficient roll crown — a flat roll profile concentrates stress at the strip edges

• Strip edge defects — burrs or turned-up edges on the strip create local stress concentrations

Corrective action:

• Vary strip width in the rolling schedule to distribute edge contact across the barrel

• Verify roll crown profile is correct for the rolling schedule

• Inspect incoming strip for edge defects

6.4 Roll Fracture

Appearance: Complete fracture of the roll, typically at the barrel/neck transition radius or at the barrel center.

Mechanism: The fracture stress exceeds the material's fracture toughness (

) at a pre-existing crack or stress concentration. Roll fracture is typically a fast fracture event — it occurs suddenly without warning.

Root causes:

• Cobble (strip jam): A strip cobble wraps around the work roll, creating extreme bending and torsional loads that exceed the roll's fracture toughness

• Thermal shock fracture: Sudden quenching of a very hot roll (e.g., emergency cooling water on a roll that has lost cooling) creates extreme thermal stresses

• Pre-existing deep cracks: Fire cracks or spalling damage that was not removed by regrinding propagate to fracture

• Material defect: Internal defects (hydrogen flakes, segregation) reduce the effective fracture toughness below the design value

Corrective action:

• Improve cobble detection and mill protection systems

• Ensure all fire cracks and surface damage are fully removed during regrinding (verify by magnetic particle inspection)

• Specify 100% UT inspection of new rolls to detect internal defects

6.5 Excessive Wear

Appearance: Rapid reduction in roll diameter, loss of roll profile (crown), surface roughness degradation.

Mechanism: Abrasive wear from the strip surface (scale, oxide, hard inclusions) removes material from the roll surface faster than the design wear rate.

Root causes:

• Roll material too soft for the application — insufficient hardness for the contact conditions

• Scale buildup — inadequate descaling allows hard scale to accumulate between roll and strip, dramatically increasing abrasive wear

• Incorrect roll material for the stand — using a tougher but softer material in a finishing stand where wear resistance is the priority

Corrective action:

• Upgrade to a harder roll material (e.g., from high chromium cast iron to HSS for finishing stands)

• Verify descaler performance — check water pressure and nozzle condition

• Review campaign length and regrinding schedule

Part 7: Roll Shop Management and Regrinding

7.1 Regrinding Requirements

After each campaign, work rolls are reground to remove surface damage (fire cracks, wear, banding marks) and restore the correct profile. The regrinding depth must be sufficient to:

• Remove all fire cracks (typically 0.5–2mm deep) — verified by magnetic particle inspection (MPI) after grinding

• Remove all spalling damage — verified visually and by MPI

• Restore the correct barrel profile (crown, taper, or CVC curve) — verified by roll profile measurement

Minimum regrinding depth: Typically 0.5–1.5mm per side (1–3mm on diameter) for hot mill work rolls; 0.1–0.3mm per side for cold mill work rolls.

Maximum total regrinding: The roll can be reground until the barrel diameter reaches the minimum acceptable diameter (typically 90–95% of the new roll diameter). At this point, the hardened layer may be consumed, or the roll neck bearing fits may become undersized.

7.2 Roll Inspection Protocol

7.3 Roll Storage and Handling

Improper storage and handling of rolls is a significant cause of premature failure:

• Storage orientation: Large rolls (backup rolls, heavy work rolls) must be stored horizontally on V-block supports — never stored vertically, which can cause bending under their own weight

• Temperature: Rolls must not be subjected to rapid temperature changes during storage — thermal shock can initiate cracks in high-hardness rolls

• Handling: Roll necks must be protected during handling — damage to the roll neck surface causes stress concentrations that can initiate fatigue cracks

• Lubrication: Roll neck journals must be lightly oiled during storage to prevent corrosion pitting, which acts as a fatigue crack initiation site

Frequently Asked Questions

Q1: What is the difference between a work roll and a backup roll?

Work rolls are the rolls that directly contact the strip being rolled. They determine the strip thickness, width, surface quality, and flatness. Backup rolls support the work rolls from behind, preventing the work rolls from deflecting under the rolling force. In a 4-Hi mill, there are 2 work rolls (top and bottom) and 2 backup rolls (top and bottom). Work rolls are smaller (typically 500–800mm diameter in hot strip mills), harder, and replaced more frequently. Backup rolls are much larger (1,200–1,800mm diameter), tougher, and last much longer.

Q2: Why are HSS (high speed steel) rolls used in finishing stands but not roughing stands?

HSS rolls have very high hardness (HS 75–90) and excellent wear resistance, giving 3–5× longer campaign life than high chromium rolls in finishing stands. However, HSS has low fracture toughness — it cannot withstand the severe impact loads from scale, crop ends, and cobbles that occur in roughing stands. Roughing stands require tougher, lower-hardness materials (forged Cr2/Cr3 steel) that can absorb impact energy without fracturing. The finishing stands have lower impact loading, making HSS's low toughness acceptable in exchange for its superior wear resistance.

Q3: What causes roll spalling and how can it be prevented?

Spalling is caused by subsurface fatigue crack initiation at the maximum shear stress depth (2–10mm below the surface), followed by crack propagation and surface breakout. The primary causes are: rolling force exceeding the roll's contact fatigue limit; pre-existing subsurface defects (inclusions, hydrogen flakes); insufficient hardened depth; and thermal shock. Prevention: specify 100% UT inspection of new rolls; verify rolling force does not exceed the roll's rated contact fatigue limit; maintain adequate hardened depth by tracking regrinding history; ensure uniform cooling water distribution.

Q4: How do I specify the correct hardness for a replacement work roll?

Hardness specification depends on the stand position and mill type. For hot strip finishing stands F4–F7, specify HS 75–90 (HSS grade). For hot strip finishing stands F1–F3, specify HS 65–75 (high chromium cast iron or Semi-HSS). For hot strip roughing stands, specify HS 40–55 (forged Cr2/Cr3). For cold mill work rolls, specify 62–66 HRC (forged high-alloy steel). Always specify both the surface hardness and the minimum hardness at 30mm depth — surface hardness alone does not ensure adequate campaign life if the hardened layer is shallow.

Q5: What is the correct regrinding depth for hot strip work rolls?

The minimum regrinding depth must be sufficient to remove all fire cracks — typically 0.5–2mm per side (1–4mm on diameter) for hot strip work rolls. After grinding, verify complete crack removal by magnetic particle inspection (MPI). If MPI shows remaining cracks, continue grinding until the surface is clean. Do not return a roll to service with residual cracks — they will propagate during the next campaign and cause spalling or fracture.

Q6: Can forged rolls be repaired after spalling damage?

Minor surface damage (shallow spalling, banding marks) can be removed by regrinding if sufficient diameter remains. Deep spalling (> 10–15mm) that has consumed the hardened layer cannot be repaired — the roll must be scrapped or the barrel re-hardened (if the roll design permits). Roll fracture is not repairable. For backup rolls with deep spalling at the barrel surface, some manufacturers offer roll sleeve repair — pressing a new hardened sleeve over the existing barrel — but this is only viable for specific roll designs.

Yile Machinery: Forged and Cast Rolling Mill Rolls

Yile Machinery manufactures custom forged and cast rolling mill rolls for hot rolling, cold rolling, plate mills, bar mills, and section mills. Our integrated manufacturing capability — from forging and casting through heat treatment, CNC grinding, and inspection — ensures that every roll meets the hardness, profile, and internal quality requirements of your specific application.

Our roll manufacturing capabilities:

• Forged rolls: Open-die forging for work rolls and backup rolls up to 1,500mm diameter; materials include Cr2, Cr3, Cr5, Cr-Ni-Mo, Semi-HSS, and custom alloys

• Cast rolls: Centrifugal casting for high chromium cast iron and ductile iron rolls; sand casting for large backup roll cores

• Heat treatment: Differential hardening (hard surface, tough core) with precise hardness gradient control; induction hardening for work rolls

• Grinding: CNC roll grinding to profile tolerances of ±0.01mm; surface finish Ra < 0.4 μm for hot mill rolls, Ra < 0.1 μm for cold mill rolls

• Inspection: 100% ultrasonic testing (UT) for internal soundness; magnetic particle inspection (MPI) for surface cracks; hardness survey on every roll; profile measurement certificate

Related products and technical resources:

• Custom Forged Steel Rolls for Rolling Mills — forged work rolls and backup rolls from 42CrMo and custom alloys

• Steel & Metal Processing Industry Solutions — complete component supply for steel mills and processing lines

• Heavy-Duty Industrial Gearboxes & Speed Reducers — mill drive gearboxes for rolling mill main drives

• Industrial Helical & Bevel-Helical Gearbox Selection Guide — service factor and torque rating methodology for mill drive gearboxes

• Heavy-Duty Girth Gears for Kilns, Mills & Dryers — large ring gears for rotary mill drives

• Forged Steel Gear Blanks & Ring Forgings — custom forged blanks for gear and roll manufacturing

• Forged vs. Cast Steel Shafts for Crushers — forging process and material selection reference

• Open-Die Forging vs. Closed-Die Forging — forging process selection guide

• Mining & Cement Industry Solutions — heavy industrial component supply

To receive a quotation, provide:

• ✅ Roll type (work roll / backup roll / intermediate roll)

• ✅ Mill type and stand position (e.g., hot strip mill, finishing stand F5)

• ✅ Roll dimensions: barrel diameter × barrel length × total length; neck diameter and length

• ✅ Required surface hardness and hardness gradient specification

• ✅ Material specification (or current roll material for replacement)

• ✅ Quantity and required delivery date

• ✅ Drawing or sample roll available for reverse engineering

Email: jasmine@yileindustry.com

Submit RFQ: www.yilemachinery.com/contactus.html

All technical inquiries receive a response within 24 hours. Reverse engineering from sample rolls or worn rolls accepted.

Related Technical Resources

• Industrial Helical & Bevel-Helical Gearbox Selection Guide

• Girth Gear Installation, Alignment & Maintenance Guide

• Rotary Kiln Trunnion Alignment Guide

• Forged vs. Cast Steel Shafts for Crushers

• Open-Die Forging vs. Closed-Die Forging

• Custom Forgings — Gear Blanks & Ring Forgings

• Steel & Metal Processing Solutions

• Mining & Cement Industry Solutions