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一、前言: 对于低合金钢(15 Cr、20 Cr)制造的活塞肖,一般采用渗碳后进行油淬的热处理工艺。生产中我们发现采用油淬后的活塞肖存在着一定的局限性。对于壁厚大于6毫米的活塞肖往往难于保证表面硬度要求,常常出现软点、软块,心部硬度有时小于HRC24,因而保证不了活塞肖热处理质量的稳定性。我们参考了有关资料及一些活塞肖生产厂的热处理工艺,从七六年开始对于15 Cr、20 Cr钢制的厚壁活塞肖首先采用低浓度氯化钠(5——10％)水溶液进行淬火试验,之后又陆续对各种壁厚的活塞肖进行了试验,经进行全部热处理项目检查均达到技术要求。八○年以来我们将15 Cr、20 Cr钢生产的活塞肖凡没有特殊要求的均改为水淬工艺。几年来经投入市场二百多万个水淬活塞肖的实践考核,直到目前为止没有一家用户反映过热处理质量问题。我们认为活塞肖采用水淬工艺不仅能达到水淬要求,而且比油淬工艺具有污染少、不燃烧、改善劳动强度、提高生产效率等优点。同时可以降低成本、节约费用。
I. Preface: For the piston made of low-alloy steel (15 Cr, 20 Cr), the heat treatment process of oil quenching after carburizing is generally adopted. We found in the production of oil-quenched piston Shaw there are some limitations. For the wall thickness greater than 6 mm, Shaw is often difficult to ensure the surface hardness requirements, often appear soft point, soft block, heart hardness is sometimes less than HRC24, thus ensuring the stability of piston Xiao heat treatment quality. We have referred to the relevant information and some heat treatment processes at Piston Shaw. Since 1976, thick-walled Pistons made of 15 Cr, 20 Cr steel have been quenched with a low concentration of sodium chloride (5-10%) Test, and after another on a variety of wall thickness of piston Xiao carried out a test, after all the heat treatment project inspection have reached the technical requirements. Since 1980, we have changed the piston of No. 15 Cr, 20 Cr steel produced by ZAO Fan to the water quenching process without any special requirements. Over the past few years by the market more than two million water quenching piston Xiao practice assessment, so far no one user to reflect the quality of overheating problems. We believe that the piston Xiao water quenching process can not only meet the water requirements, but also less pollution than the oil quenching process, do not burn, improve labor intensity, improve production efficiency and so on. At the same time can reduce costs and save costs.