為了縮短生產(chǎn)時間和降低塑料成型模的成本，需要提高模具鋼的切削加工性能。為此，日本神戶鋼鐵公司技術開發(fā)部、材料研究所的科技人員為S55C型碳鋼開發(fā)了一種具有切削加工性能優(yōu)良的新鋼號KTSM21M，其成分為0.30%C,0.30%Si,0.125%Mn,以及Cr,Mo,V,S合金元素。

根據(jù)對實際尺寸試驗鍛造的評定，表明該新鋼號的力學性能和腐蝕性能幾乎與KTSM21（模具用常規(guī)鋼）的相同，而其可焊性優(yōu)于KTSM21。還提高了重型銑削加工和高速機加工，例如端銑等的切削加工性能。可望新的KTSM21M鋼適用于從粗機加工到精加工的所有工藝。

To shorten the production time and reduce the cost of plastic molding, the need to improve machining performance of die steel. To this end, Japan's Kobe Steel Technology Development Department, Institute of Materials Science and Technology staff to develop a S55C carbon steel with excellent cutting performance of the new steel KTSM21M, the composition 0.30% C, 0.30% Si, 0.125% Mn, and Cr, Mo, V, S alloying elements. Based on the assessment of the actual size of forging test, indicating that the new steel mechanical properties and corrosion resistance almost KTSM21 (mold using conventional steel) of the same, and its superior solderability KTSM21. Also improved heavy-duty milling and high-speed machining, for example, such as end milling cutting performance. Steel is expected to apply the new KTSM21M from rough machining to finishing all the process.

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