English Views: 0 Author: Site Editor Publish Time: 2026-07-15 Origin: Site
Aluminum strip cast-rolling composite rolls are core equipment for near-net-shape aluminum processing, with forged roller Sleeves acting as the key working layer bearing alternating thermal-mechanical cyclic loads. Based on the national machinery industry standard JB/T 14362-2023. Combined with cutting-edge material research achievements from 2025 to 2026 and the latest green, intelligent and high-efficiency transformation trends of the aluminum processing industry, Jiangyin Eternal Heavy Industry Co.,Ltd establishes comparative data tables of alloy composition, process performance and market demand, analyzes failure mechanisms of traditional roller Sleeves, summarizes optimized metallurgical forging and heat treatment technologies, and forecasts the technological iteration direction of high-performance roller Sleeves under the background of new energy aluminum foil demand explosion.
Twin-roll cast-rolling directly converts molten aluminum into thin aluminum strip blanks, cutting production energy consumption by 30%–40% compared with hot rolling, and has become the mainstream production route for battery aluminum foil, packaging aluminum foil and architectural aluminum substrates in 2025–2026. The roller Sleeve is the core wearable component of cast-rolling mills, subjected to rapid temperature cycling (300–650 ℃ thermal shock) and continuous rolling contact stress, with thermal fatigue cracking accounting for over 80% of early roll failure accidents.
Before the release of JB/T 14362-2023 in 2024, the aluminum cast-rolling roller industry lacked unified standards for forging process, hardness uniformity and ultrasonic flaw detection, leading to inconsistent service life of domestic roller Sleeves (3,000–5,000 working hours) and frequent replacement downtime. The standard systematically standardized material composition, smelting, forging ratio, heat treatment and non-destructive testing indexes of forged composite rolls, becoming the core production basis for domestic roller manufacturers in 2025–2026.
Driven by the new energy vehicle power battery foil market, the global demand for aluminum cast-rolling rolls reached 254,000 tons in 2026, a year-on-year increase of 16.5%, among which high-performance forged roller Sleeves represented by 32Cr3NiMoV accounted for 48.7% of total demand, 5.2 percentage points higher than 2025. This paper takes forged roller Sleeves as the research object, integrates standard specifications, latest laboratory research and industrial field data, and comprehensively discusses material matching, manufacturing process control, application performance and future development trends.
JB/T 14362-2023 divides composite rolls into two functional parts: wear-resistant, thermal-fatigue-resistant roller Sleeves and high-toughness load-bearing roller shafts, with clear limits on C, Cr, Ni, Mo, V and impurity elements P, S. Table 1 lists the mass fraction ranges of core commercial grades, and compares the applicable scenarios of each material.
Table 1 Chemical Composition & Application Scenarios of Roller Sleeve & Roller Shaft Forging Materials (wt.%)
Component | Grade | C | Mn | Si | P ≤ | S ≤ | Cr | Ni | Mo | V | Cu ≤ | Main Application |
Roller Sleeve | 32Cr3NiMoV (32Cr3Mo1V) | 0.27–0.37 | ≤0.50 | ≤0.20 (≤0.10 for VCD) | 0.025 | 0.025 | 2.75–3.25 | 0.90–1.10 | 0.20–0.25 | 0.15–0.25 | 0.25 | High-speed thin foil cast-rolling, anti-thermal fatigue mainstream grade |
Roller Sleeve | 34CrNi3Mo | 0.30–0.40 | 0.50–0.80 | 0.17–0.37 | 0.025 | 0.025 | 0.70–1.00 | 2.75–3.25 | 0.25–0.30 | — | 0.25 | Medium-thick aluminum strip, low thermal load production lines |
Roller Shaft | 40Cr | 0.37–0.44 | 0.50–0.80 | 0.17–0.37 | 0.025 | 0.025 | 0.80–1.10 | — | — | — | 0.25 | Conventional small cast-rolling mill mandrel |
Roller Shaft | 42CrMnV | 0.38–0.45 | 0.60–0.90 | 0.17–0.37 | 0.025 | 0.025 | 0.90–1.20 | — | — | 0.15–0.25 | 0.25 | Large wide-width cast-rolling mill high-load mandrel |
Roller Shaft | 56Cr | 0.52–0.60 | 0.35–0.65 | 0.17–0.37 | 0.025 | 0.025 | 1.20–1.30 | — | — | — | 0.25 | High-hardness support shaft for low-speed production |
Note: VCD vacuum deoxidation process reduces Si content to inhibit silicate inclusions; Cu is residual impurity element, and hydrogen content is negotiated by suppliers and buyers.
32Cr3NiMoV is the preferred roller Sleeve material for mainstream manufacturers in 2025–2026. Compound alloying of Cr-Ni-Mo-V forms dispersed vanadium carbide precipitates, which hinder thermal fatigue crack propagation under alternating hot and cold cycles, with thermal fatigue resistance 22% higher than 34CrNi3Mo steel under the same working conditions.
In 2025, joint research by Shanghai University and domestic leading roller manufacturers developed rare earth (Ce-La) microalloyed 32Cr3NiMoV steel, adding 0.015%–0.025% rare earth elements during LF-VD refining. Rare earth spheroidizes sharp Al₂O₃ and MnS brittle inclusions, eliminating crack initiation sources. Rotating bending fatigue tests show the fatigue limit of modified steel increases by 14%–17%, and the average service life of roller Sleeves rises from 4,800 h to 5,700 h, reducing roll replacement frequency by 18%. Table 2 compares mechanical performance of standard and rare earth modified 32Cr3NiMoV after standard quenching & tempering.
Table 2 Mechanical Property Comparison of Conventional & RE-Modified 32Cr3NiMoV Roller Sleeve Forgings
Performance Index | Standard 32Cr3NiMoV | RE Microalloyed 32Cr3NiMoV | Improvement Rate | JB/T 14362-2023 Standard Limit |
Surface Hardness | 390–410 HBW | 395–415 HBW | Hardness uniformity ±3 HBW | 380–420 HBW, hardness difference ≤15 HBW |
Room Temperature Impact Toughness | 32 J/cm² | 45 J/cm² | +40.6% | ≥28 J/cm² |
Thermal Fatigue Cycle Failure Times | 12,600 cycles | 16,800 cycles | +33.3% | ≥10,000 cycles |
Tensile Strength | 930 MPa | 965 MPa | +3.8% | ≥880 MPa |
Maximum Service Life | 4,800 h | 5,700 h | +18.7% | — |
The complete manufacturing flow of composite roll forgings is: Smelting → Ingot Casting → Forging → Pre-heat Treatment → Rough Machining → Final Heat Treatment → Precision Machining → Ultrasonic Testing → Hardness Inspection → Marking & Packaging. All process thresholds are clearly defined in JB/T 14362-2023, and combined with 2025–2026 intelligent forging and heat treatment optimization technologies for comparative analysis.
The standard specifies three qualified smelting paths:
1. EAF + LF Ladle Refining + VCD Vacuum Degassing (conventional mass production route);
2. ESR Electroslag Remelting (high-end long-life roller Sleeve exclusive process);
3. Other smelting processes approved by buyers with stable quality guarantee.
Table 3 compares metallurgical quality indexes of conventional LF-VD and ESR remelting processes, which explains why ESR technology has become the mainstream transformation direction of high-end roller production lines from 2025 to 2026.
Table 3 Metallurgical Quality Comparison of LF-VD and ESR Smelting Processes
Quality Index | LF+VD Conventional Smelting | ESR Electroslag Remelting | Industrial Impact |
Total Inclusion Area Fraction | 0.032%–0.045% | 0.008%–0.015% | ESR reduces inclusion defects by 65%–75% |
Center Segregation Grade | Grade 2.0–2.5 | Grade 0.5–1.0 | Suppress internal crack initiation during rolling |
Ultrasonic Detectable Defect Rate of Finished Roller Sleeve | 12.7% | 3.1% | One-time pass rate increased by 9.6 percentage points |
Standard Required Forging Ratio | ≥3.0 | ≥2.0 | ESR reduces forging deformation energy consumption by 20% |
Unit Manufacturing Cost Index | 100 (Benchmark) | 118 | Premium offset by extended service life |
ESR remelting eliminates central shrinkage and loose segregation of steel ingots, and the standard relaxes the forging ratio of ESR steel to ≥2.0, while conventional refined steel requires forging ratio ≥3.0 to fully compact internal pores. In 2026, medium and large roller manufacturers are accelerating ESR production line transformation; Liaoyang Metallurgical Roll invested CNY 13 million to build a 5-ton ESR furnace, with annual output of high-end roller Sleeves reaching 2,000 tons
JB/T 14362-2023 regulates three core forging control requirements:
1. Sufficient cutting allowance at both ends of steel ingots to remove shrinkage, looseness and severe segregation areas;
2. Full cross-section penetration under matched tonnage forging equipment, consistent axial centerline of forging blank;
3. Forging ratio threshold: ordinary steel ≥3.0, ESR remelted steel ≥2.0.
2025 patented segmented three-fire forging technology optimizes roller Sleeve hollow blank forming: rough upsetting → punching bidirectional through hole → core shaft drawing, controlling punching diameter ratio ≤0.33, effectively solving wall thickness unevenness and horn mouth defects of thin-walled roller Sleeves, material utilization rate increased by 11% compared with traditional single-fire forging.
Heat treatment is the decisive link to balance roller Sleeve hardness and toughness, divided into pre-heat treatment and final heat treatment:
1. Pre-heat treatment: Eliminate white spots of forgings, improve ultrasonic penetration and cutting performance, prepare uniform microstructure for final heat treatment;
2. Final heat treatment: Adjust hardness to meet delivery standards according to customer requirements.
Standard hardening index: roller Sleeve surface hardness 380–420 HBW, hardness difference of each measuring point ≤15 HBW; roller shaft surface hardness 35–45 HSD. In 2025–2026, leading enterprises adopt digital twin heat treatment platforms, integrating electromagnetic field, temperature field and stress field multi-physical simulation, realizing closed-loop intelligent control of quenching and tempering parameters, hardness uniformity error reduced from ±12 HBW to ±4 HBW, and product qualification rate increased by 12.3%.
JB/T 14362-2023 references JB/T 8467 ultrasonic testing standard, setting strict defect equivalent limits:
1. No cracks, white spots, shrinkage cavities and accumulated non-metallic inclusions in roller Sleeve and roller shaft;
2. Working layer depth of roller Sleeve: defect equivalent diameter ≤2 mm; other depth ranges: defect equivalent diameter ≤3 mm;
3. Roller shaft defect area limit: single defect with echo amplitude F ≥ 1/2 screen height ≤25 cm²; small defects with F < 1/4 screen height are not recorded.
Testing must be carried out after mechanical finishing, surface roughness Ra ≤3.2 μm to ensure ultrasonic signal stability.
The aluminum cast-rolling industry’s four major demand segments for forged roller Sleeves are new energy battery foil, packaging aluminum foil, architectural aluminum strip and transportation lightweight aluminum blanks, with differentiated material and performance requirements as shown in Table 4.
Table 4 Application Market Demand Characteristics of Forged Roller Sleeves (2026 Statistical Data)
Application Field | Market Share of Roller Sleeve Consumption | Preferred Material Grade | Core Performance Requirement | Average Service Life |
New Energy Battery Ultra-Thin Foil | 38.2% | RE-Modified 32Cr3NiMoV | High thermal fatigue resistance, low surface roughness | 5,500–6,000 h |
Food & Pharmaceutical Packaging Foil | 26.5% | Standard 32Cr3NiMoV | Uniform hardness, anti-sticking aluminum | 4,500–5,000 h |
Architectural Decorative Aluminum Strip | 24.1% | 34CrNi3Mo | Low manufacturing cost, medium wear resistance | 3,800–4,300 h |
Rail Transit Lightweight Aluminum Blank | 11.2% | RE-Modified 32Cr3NiMoV | High strength under heavy rolling load | 5,200–5,800 h |
New energy battery foil is the fastest-growing track, with domestic battery foil capacity expanding 38% year-on-year in 2025, driving demand for high-end rare earth modified roller Sleeves to surge by 42%. Ultra-thin foil (0.0045 mm) cast-rolling puts forward stricter requirements for roller Sleeve surface stability, and 32Cr3NiMoV series forgings completely replace cast iron roller Sleeves due to low thermal deformation.
Industrial failure statistics from 2025–2026 show three dominant failure modes of forged roller Sleeves:
1. Thermal fatigue crack failure (81%): Alternating thermal shock produces surface microcracks, molten aluminum penetrates cracks to form hard alumina inclusions, expanding cracks under cyclic stress and leading to roller Sleeve cracking;
2. Uneven hardness local wear failure (13%): Insufficient forging penetration or unbalanced heat treatment causes local hardness deviation exceeding 15 HBW, forming grooves on the roller surface;
3. Internal inclusion defect failure (6%): Poor smelting control leads to large-size aggregated inclusions, triggering internal ultrasonic defects and forced scrapping.
Adopting ESR smelting + rare earth microalloying + intelligent heat treatment integrated technology can reduce comprehensive failure rate by 74% compared with traditional LF-VD single-process roller Sleeves.
Driven by dual-carbon policies, the aluminum processing industry implements full-life carbon footprint management. By 2026, fully digitalized roller forging enterprises reduce carbon emission intensity to below 2.1 tons CO₂ per ton of product, 28% lower than traditional workshops. Industry trends include:
1. Popularization of ESR + VCD low-carbon smelting to reduce waste steel consumption and thermal processing energy consumption;
2. Roller remanufacturing technology industrialization: laser cladding repairs failed roller Sleeves, recovery cost is 45% of new forgings, single roller service life restored to original standard;
3. Green certification threshold raised: downstream large aluminum enterprises stop purchasing roller products without carbon emission audit reports.
Intelligent transformation is the core competitive track in 2025–2026:
1. Online ultrasonic automatic flaw detection equipment replaces manual testing, detection efficiency increased by 3 times, defect identification accuracy reaches 99.2%;
2. Roller life prediction digital twin system monitors thermal stress and surface wear in real time, early warning of fatigue cracks 72 hours in advance, reducing production downtime by 60%;
3. Closed-loop quality traceability system: each roller Sleeve is marked with unique melting furnace number and forging serial number, all chemical, hardness and UT test data stored in electronic quality certificates as required by JB/T 14362-2023.
Two material research directions dominate laboratory and industrial pilot projects in 2026:
1. Gradient functional roller Sleeve forgings: surface high Cr-V anti-fatigue layer + inner high-toughness substrate integrated forging, balancing service life and raw material cost, pilot line roller Sleeve life increased by 22%, nickel-molybdenum strategic metal consumption reduced by 8.3%;
2. Low-cost rare earth microalloyed optimization: reduce Ni content appropriately while adding rare earth elements to maintain thermal fatigue performance, unit production cost decreased by 7%–10%, suitable for medium and low-speed architectural aluminum strip production lines.
JB/T 14362-2023, the first dedicated national standard for aluminum cast-rolling composite rolls, has become the export inspection basis for domestic roller products to Southeast Asia, Central Asia and Russia in 2025–2026. The unified standard eliminates inconsistent technical thresholds of domestic manufacturers, and the export volume of high-end forged roller Sleeves increased by 23% year-on-year in 2026, breaking the long-term monopoly of European and American roller brands in the high-end aluminum foil market.
Forged roller Sleeves are the core consumable determining the efficiency and product quality of aluminum strip cast-rolling lines. The release and implementation of JB/T 14362-2023 establishes unified technical bottom lines for material composition, smelting forging, heat treatment and non-destructive testing of domestic roller Sleeves, solving the long-standing problem of inconsistent product quality in the industry.
From 2025 to 2026, driven by the explosive demand of new energy battery ultra-thin aluminum foil, the industry shows three core trends: green low-carbon manufacturing, full-process intelligent detection and new alloy material iterative upgrading. ESR electroslag remelting, rare earth microalloy modification and digital twin heat treatment technologies have become the standard configuration of high-end roller production lines, significantly improving the thermal fatigue life and comprehensive yield of 32Cr3NiMoV series roller Sleeve forgings.
In the future, gradient composite integrated forging and roller remanufacturing technologies will further reduce the full-life cycle cost of cast-rolling rolls, and the continuous improvement of domestic independent standard systems will further enhance the international market share of China’s forged aluminum cast-rolling roller products. Manufacturers should strictly implement JB/T 14362-2023 specifications, accelerate intelligent and green process transformation, and develop low-cost, long-life new alloy materials to match the high-efficiency and low-energy consumption development demand of the aluminum processing industry.
