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Latest News
05.Aug.2025
Case Studies
SK5 Cracking Case Solved with SK85M Material from Nippon Steel
A stamping factory in central Taiwan encountered repeated cracking issues when using untreated SK5 material during single-stage forming operations. The cracks not only disrupted production but also led to a drop in product yield and increased material waste.
Processing conditions and observed issues included:
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Material thickness: 1.2mm
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Bending angle: 90°
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Corner radius: 2.5R
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Material sourced from outside Japan
Despite meeting standard specifications on paper, the SK5 material fractured early in production, even before large-scale use, causing downtime and loss.
The factory attempted various parameter adjustments but saw no significant improvement. Upon a peer’s recommendation, the customer approached HUNG SHUH for a deeper investigation and material consultation.
After evaluating the full processing context, we suspected the cracking stemmed from material inconsistencies, possibly due to:
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Excessive internal impurities
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Uneven chemical composition
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Inadequate quality control during steelmaking
These internal flaws could lead to serious forming failures, even if the supplied material passed basic specs.
HUNG SHUH’s Recommendation & Technical Support
To address these challenges, we recommended:
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Switching to SK85M material produced by Nippon Steel, known for its consistency in structure and chemistry
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Conducting trial runs with small batches to validate material performance before committing to full-scale replacement
Test Results & Customer Feedback
After trialing the Nippon Steel SK85M, the customer reported:
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A smooth, fracture-free forming process
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Noticeably higher product yield and restored line stability
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Complete resolution of previous cracking-related issues
Customer Feedback:
"After switching to SK85M from Nippon Steel, the stamping went smoothly, and we haven’t seen a single fracture since. Our line is finally back to normal!"
Steel quality isn’t just about surface specs it’s about consistent structure and controlled processing. At HUNG SHUH, we offer proven, high-performance materials from Japan’s top producers to help customers overcome hidden production bottlenecks. If you're facing similar issues, we’re here to support your success.
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