<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[模具钢选材对照表：718H vs NAK80 vs S136 选哪个？]]></title><description><![CDATA[<p dir="auto">**模具钢选材是决定模具寿命和产品质量的关键决策。**本文对比三种最常用的预硬塑料模具钢，帮你在设计阶段就做出正确选择。</p>
<h2>一、三大主流模具钢参数对比</h2>
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>性能指标</th>
<th>718H</th>
<th>NAK80</th>
<th>S136</th>
</tr>
</thead>
<tbody>
<tr>
<td>硬度 (HRC)</td>
<td>32-36</td>
<td>37-42</td>
<td>28-32</td>
</tr>
<tr>
<td>预硬状态</td>
<td><img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/2705.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--white_check_mark" title=":white_check_mark:" alt="✅" /> 已预硬</td>
<td><img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/2705.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--white_check_mark" title=":white_check_mark:" alt="✅" /> 已预硬</td>
<td><img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/274c.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--x" title=":x:" alt="❌" /> 需淬火</td>
</tr>
<tr>
<td>镜面抛光性</td>
<td>★★★☆</td>
<td>★★★★☆</td>
<td>★★★★★</td>
</tr>
<tr>
<td>耐腐蚀性</td>
<td>★★☆</td>
<td>★★★</td>
<td>★★★★★</td>
</tr>
<tr>
<td>加工性</td>
<td>★★★★</td>
<td>★★★☆</td>
<td>★★★</td>
</tr>
<tr>
<td>价格指数</td>
<td>1.0x</td>
<td>1.4x</td>
<td>1.8x</td>
</tr>
</tbody>
</table>
<h2>二、选材决策指南</h2>
<h3>选 718H 的场景</h3>
<ul>
<li>一般家电、日用品注塑模</li>
<li>模具尺寸大、对成本敏感</li>
<li>产品外观要求一般</li>
</ul>
<h3>选 NAK80 的场景</h3>
<ul>
<li>透明件或高光表面产品</li>
<li>需优良抛光性</li>
<li>模具结构复杂，加工量大</li>
</ul>
<h3>选 S136 的场景</h3>
<ul>
<li>镜面要求极高的产品（如导光板）</li>
<li>腐蚀性塑料（PVC、POM 含酸性分解物）</li>
<li>医疗器械模具</li>
</ul>
<h2>三、常见误区</h2>
<p dir="auto"><img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/274c.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--x" title=":x:" alt="❌" /> <strong>误区1</strong>：越硬的钢越好 → 过高的硬度增加加工难度和成本<br />
<img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/274c.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--x" title=":x:" alt="❌" /> <strong>误区2</strong>：NAK80 可以替代 718H → 大模具用 NAK80 成本过高且韧性不足<br />
<img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/2705.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--white_check_mark" title=":white_check_mark:" alt="✅" /> <strong>正确做法</strong>：根据产品数量、表面要求、塑料材料综合评估</p>
<hr />
<p dir="auto"><img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/1f4cc.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--pushpin" title=":pushpin:" alt="📌" /> 更多模具技术资料，访问 <strong><a href="https://mj7.cn/" rel="nofollow ugc">模极社 - 模具钢专题</a></strong>。</p>
<hr />
<p dir="auto"><strong>相关推荐：</strong></p>
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<li><a href="https://www.mj7.cn/t/topic" rel="nofollow ugc">模具分型面设计：平面分型与曲面分型的选取原则及加工工艺</a></li>
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</ul>
<p dir="auto">&lt;hr&gt;<br />
&lt;p&gt;&lt;strong&gt;<img src="https://forum.mj7.cn/assets/plugins/nodebb-plugin-emoji/emoji/android/1f4cc.png?v=ri5u9ft48ro" class="not-responsive emoji emoji-android emoji--pushpin" title=":pushpin:" alt="📌" /> 推荐阅读：&lt;/strong&gt;&lt;/p&gt;<br />
&lt;ul&gt;<br />
&lt;li&gt;&lt;a href="/t/%E5%9B%9E%E9%92%88return-pin/617"&gt;回针（Return Pin）&lt;/a&gt;&lt;/li&gt;<br />
&lt;li&gt;&lt;a href="/t/%E9%94%A5%E5%BD%A2%E7%B2%BE%E5%AE%9A%E4%BD%8Dtaper-lock/606"&gt;锥形精定位（Taper Lock）&lt;/a&gt;&lt;/li&gt;<br />
&lt;li&gt;&lt;a href="/t/%E9%A1%B6%E9%92%88ejector-pin%E6%B3%A8%E5%A1%91%E6%A8%A1%E5%85%B7%E7%94%A8/624"&gt;顶针（Ejector Pin）注塑模具用&lt;/a&gt;&lt;/li&gt;<br />
&lt;/ul&gt;</p>
<hr />
<p dir="auto">哪个方案更实用？欢迎投票讨论。</p>
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