調質工藝五分鐘解析：淬火回火順序與不鏽鋼適用性判斷

A Detailed Explanation of the Quenching and Tempering Process: Stainless Steel Cannot Be Arbitrarily Quenched and Tempered Yesterday, a colleague suddenly asked me whether stainless steel can undergo quenching and tempering. I realized that many people actually do not understand what quenching and tempering is. Today let’s take an in-depth look at this topic. What exactly is quenching and tempering? Simply put, quenching and tempering consists of quenching followed by high-temperature tempering. Both steps are indispensable. Why must both processes be performed together? Is quenching alone not enough? Steel that is only quenched becomes extremely hard but very brittle, with high internal stress. It is prone to cracking and cannot be used directly. What is the purpose of tempering? Tempering means reheating the quenched steel at a low temperature to release internal stress and improve toughness. It sacrifices a small amount of hardness in exchange for comprehensive properties such as crack resistance and impact resistance. Can the material properties be adjusted? Yes! A low tempering temperature yields high hardness and good wear resistance; a high tempering temperature delivers excellent toughness and impact resistance. This is why quenched and tempered steel boasts far better comprehensive performance than materials treated with ordinary heat treatment. So can stainless steel be quenched and tempered? It depends on the type. Common austenitic stainless steels such as 304 and 316, as well as ferritic stainless steel 430, cannot be quenched and tempered, because martensite cannot be formed, making the treatment ineffective. Which types are suitable? Martensitic stainless steels 410 and 420 can be quenched and tempered. They are the material commonly used for stainless steel cutting tools. So we can judge whether quenching and tempering is feasible based on the material microstructure? That’s right. The core of quenching and tempering is to adjust the hardness and toughness of steel to an optimal state, turning a usable material into a high-performance one. 详解调质工艺，不锈钢不能乱调质 昨天我同事突然问我一个问题，说不锈钢能不能调制。突然发现好多人其实都搞不清调制到底是个啥，今天咱们就来好好聊聊这个话题。 那调质到底是什么？ 很简单，调质就是淬火加高温回火，两步缺一不可。 为什么一定要两个工序一起做？只淬火不行吗？ 只淬火钢材会变得很硬，但特别脆，内应力很大，容易开裂，根本没法直接用。 那回火是干嘛的？ 回火就是把淬火后的钢材重新低温加热，释放内应力、提升韧性。稍微牺牲一点硬度，换来不开裂、耐冲击的综合性能。 性能还能调吗？ 可以！回火温度低，硬度高、耐磨；温度高，韧性好、抗冲击。这也是调质综合性能远超普通热处理的原因。 那不锈钢到底能不能调质？ 分种类。常见的 304、316 奥氏体不锈钢和 430 铁素体不锈钢都不能调质，淬不出马氏体，做了没用。 哪种可以？ 410、420 马氏体不锈钢可以调质，我们常用的不锈刀具就是它。 所以能不能调质，看材质组织就行？ 对，调质的核心，就是把钢材的硬度和韧性调到最佳状态，让材料从能用变好用。#模具钢 #模具 #steel