202 Stainless Steel Limitation & Difficult Zero-Spangle Galvanized Sheet Custom Punching Case
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作者:selina
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发布时间 :2026-05-14
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10 次浏览:
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This article explains why 202 stainless steel is difficult and rarely used for perforation, especially for 1.6mm × 1.6mm tiny holes and 1.5mm thick raw materials. It also presents a real customized case for a Vietnamese customer requiring zero-spangle hot-dip galvanized sheet with high zinc coating, special lock holes, window cutting and strict punching tolerance, demonstrating professional solutions for difficult non-standard perforated metal orders.
202 Stainless Steel Limitation & Difficult Zero-Spangle Galvanized Sheet Custom Punching Case
Many customers often consult why 202 stainless steel is rarely used in the perforation industry, why almost no factories accept orders for 1.6mm×1.6mm tiny holes, and why it is difficult to purchase 1.5mm thick 202 stainless steel raw materials. Combined with practical production experience, we clearly explain the real industry reasons below.
1. Reasons Why 202 Stainless Steel Is Seldom Used for Punching
202 stainless steel is classified as high-manganese stainless steel. Compared with 201 and 304 stainless steel, it features high hardness, rapid work hardening and poor toughness. During high-speed punching, the material hardens instantly, easily causing hole cracking, severe burrs and sheet tearing. In addition, its poor thermal conductivity makes it hard to dissipate punching heat, resulting in serious mold loss. Most perforation factories are reluctant to process 202 stainless steel, as its mold consumption cost is three times higher than that of ordinary galvanized sheets and 201 stainless steel. Moreover, 202 stainless steel has unstable chemical composition and poor rust resistance, making it unsuitable for outdoor and humid export projects. It cannot meet the strict quality inspection standards for South Korean orders, and all materials are produced in compliance with RoHS 2.0 environmental safety requirements.
2. Why No Factory Accepts 1.6mm×1.6mm Small Hole Orders
In the metal processing industry, holes equal to or smaller than the sheet thickness are defined asextreme tiny holes with high processing difficulty. Ordinary processing factories generally refuse orders for 1.5mm thick 202 steel sheets with 1.6mm square holes. The slender punching needles are extremely fragile and easy to break under the high hardness of 202 stainless steel. The high material tension leads to uneven hole walls, collapsed holes and serious burrs. Even with imported high-speed steel molds, dozens of punching needles may break within one day, bringing a scrap rate of over 40%. Our factory breaks through industrial technical barriers. We customize reinforced precision molds and optimize stamping frequency and heat dissipation technology to solve the processing difficulties of extreme tiny holes on 202 stainless steel. By accurately controlling the stamping rhythm, improving mold materials and adding sheet pretreatment procedures, we effectively reduce needle breakage, minimize waste, and keep the scrap rate at an extremely low industrial level. We are one of the few manufacturers capable of undertaking such difficult non-standard perforation orders. The stamping process is implemented in accordance with ISO 1461 metal anti-corrosion specifications.
3. Why 1.5mm Thick 202 Stainless Steel Is Hard to Purchase
202 stainless steel is not a mainstream steel grade in the market. Steel mills rarely produce the non-standard intermediate thickness of 1.5mm. Commonly stocked specifications are mostly thin sheets below 1.0mm or thick plates above 2.0mm. The inventory of 1.5mm sheets is extremely low. Due to low market demand and high production costs, steel mills are unwilling to arrange rolling production for 202 stainless steel. Ordinary steel traders have almost no spot goods, making it difficult for customers to purchase qualified 1.5mm thick 202 stainless steel raw materials. Raw material selection strictly abides by ASTM A123 steel material control standards to ensure stable basic performance of steel sheets.
4. Professional Factory Suggestions
For customers requiring micro-hole perforated sheets, we recommend replacing 202 stainless steel with 201 or 304 stainless steel. These two materials have better toughness, lower work hardening degree and lower mold loss. For South Korean export orders, 304 stainless steel can pass RoHS 2.0 and other international environmental testing standards. In addition to long-term exports to South Korea, our factory also steadily supplies goods to Bulgaria, deeply engaging in the Eastern European hardware and mechanical equipment supporting market. Bulgarian purchasers prefer high-difficulty, non-standard and small-batch customized perforated sheets, which cannot be processed by ordinary factories due to precision limitations. Our mature production technology meets the customization requirements of various industrial components, ventilation filtration and mechanical protection sheets in Bulgaria, and all products comply with BDS certification standards of Bulgaria. If customers have mandatory requirements for 202 material, non-standard thickness and extreme tiny holes, we can arrange special customized production. We solve the pain points of sheet cracking, hole collapse and high waste rate, and exclusively undertake difficult orders that peers cannot process or refuse. We continuously optimize production procedures, strictly control every process, reduce production errors and losses to the greatest extent, and provide high-quality non-standard customized perforated sheets for clients from South Korea, Bulgaria and other overseas regions.
5. Real Difficult Customized Case: Vietnam Customer Zero-Spangle Galvanized Sheet
We are always willing to take on unconventional and complicated perforated sheet orders that most factories reject. Recently, we completed a highly difficult customized project for a Vietnamese client. The customer required zero-spangle hot-dip galvanized steel sheet (high zinc coating: 127g/m²), 1.5mm plate thickness, 5mm punching holes with 2mm center spacing. Moreover, the sheet needed special processing including door lock holes and precise window cutting. Due to complex mixed punching, asymmetrical cutting and strict spacing tolerance, most local manufacturers refused this order considering its high risk and high scrap rate.
Our factory took over this challenging project firmly. We purchased high-grade zero-spangle galvanized raw materials in advance and adopted high-precision laser cutting for window shaping. In the early trial production stage, we lost nearly 1000 USD on wasted steel plates due to poor ductility of high-zinc galvanized sheet and complex lock hole jumping spacing. We fully bore all material losses without charging any extra fees to the customer. Our workers worked overtime continuously for 5 days to adjust punching sequences, optimize lock hole jumping distance, and calibrate every single hole position. Finally, we delivered flawless galvanized products with uniform hole spacing, neat lock holes, no jumping errors and smooth cutting edges. This case fully proves our stable technical capability and responsible service attitude for high-risk customized galvanized perforated metal sheets.
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