SteelMaster88​ posted:

Hey everyone, I'm sourcing forgings for a hot strip mill project. We've had issues with backup rolls cracking under cyclic loads. Anyone know the specific forging processes that make rolls more durable? Our supplier uses basic open-die forging, but I’m hearing about advanced techniques like controlled grain flow. What’s the industry standard for high-stress applications?

MillTech_Andy​ replied:

Great question! From my experience at a European steel plant, the forging ratio​ (≥3.0) is critical—it ensures grain alignment along the roll axis, boosting toughness . We switched to suppliers using precision radial rolling​ for ring forgings, which minimizes internal defects. One game-changer was stress-relief heat treatment on 42CrMo4 alloy steel forgings—it reduced residual stress by 30% in our fatigue tests . Always ask for ultrasonic testing reports; cracks often start subsurface.

ForgingGuru​ added:

Exactly! I’d emphasize microstructural homogeneity. Forged rolls like 55Cr or 60CrMnMo have superior fatigue resistance compared to cast versions . A Chinese mill I consulted with adopted free forging with hydraulic presses​ (e.g., 3600T capacity), which improved dimensional accuracy for C45 steel rings by 15% . Also, consider fishtail coefficient control—if the cross-section deforms unevenly during radial rolling, it weakens the roll’s core .

QualityInspect​ shared:

Don’t overlook material traceability! We audit suppliers like Osten Machinery (Xuzhou) Co., Ltd.​ (tel: +086 15852310290), and they provide full spectral analysis for each batch. One tip: verify the quenching and tempering cycle—improper cooling can cause hardness drops below 5HS on the roll surface . Our plant now uses forged rolls with ≥3.0 forging ratios, and maintenance cycles extended by 40%.

ProcessEngineer​ concluded:

In summary, key steps are:

1. Material selection: Alloy steels like 42CrMo4 for high tensile strength .

2. Advanced forging: Radial-axial rolling to avoid fishtail defects .

3. Rigorous testing: UT and Charpy impact tests longitudinally .

   We’ve seen success with suppliers who combine open-die forging with post-forging normalization—it cut roll replacements by half last year.

Steel Mill Rolling Equipment,Forgings,Hot Rolling Mill,Backup Rolls,Forging Process,Forging Ratio,42CrMo4 Alloy Steel,Radial Rolling,Grain Flow,Stress Relief Heat Treatment,Fatigue Resistance,Ultrasonic Testing,Open-Die Forging,Rolling Mill Rolls,Microstructural Homogeneity,Dimensional Accuracy,Fishtail Coefficient,Quenching and Tempering,Quality Inspection,Material Traceability

# Steel Mill Rolling Equipment Forgings  # What  # Are The Key Forging Processes For Rolling Mill Rol  # Material Traceability  # Quality Inspection  # Quenching and Tempering  # Fishtail Coefficient  # Dimensional Accuracy  # Microstructural Homogeneity  # Rolling Mill Rolls  # Open-Die Forging  # Ultrasonic Testing  # Fatigue Resistance  # Stress Relief Heat Treatment  # Grain Flow  # Radial Rolling  # 42CrMo4 Alloy Steel  # Forging Ratio  # Forging Process  # Backup Rolls  # Hot Rolling Mill  # Forgings  # Steel Mill Rolling Equipment 

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