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我厂是生产小规格机械传动链条的专业厂,链板用40Mn热轧带钢制造。其化学成分是0.37～0.45%c,0.70～1.00%Mn、0.17～0.37%Si、≤0.04%S、P。链板厚度为1.6～1.7mm,冲制成型后热处理工艺为860±5℃×20～25min、油淬;300～320℃×30min回火、水冷。技术要求:淬火硬度HRC50～57,金相组织为淬火马氏体。回火硬度HRC43～50,金相组织为回火马氏体+回火索氏体。热处理后用六角滚筒去氧
I plant is the production of small mechanical transmission chain of professional factory, chain plate with 40Mn hot-rolled strip manufacturing. Its chemical composition is 0.37 ~ 0.45% c, 0.70 ~ 1.00% Mn, 0.17 ~ 0.37% Si, ≤ 0.04% S, P. Chain thickness of 1.6 ~ 1.7mm, after stamping heat treatment process is 860 ± 5 ℃ × 20 ~ 25min, oil quenching; 300 ~ 320 ℃ × 30min tempering, water cooling. Technical requirements: quenching hardness HRC50 ~ 57, the microstructure of quenched martensite. Temper hardness HRC43 ~ 50, the microstructure of tempered martensite + tempered sorbite. Heat treatment with hexagonal drum deoxygenation