Ningbo Ningshing Precision Machinery Group Co., Ltd.Who We AreNo.25 Hongxiang Rd A area Industry, Hongtang Jiangbei, Ningbo, 315033, Zhejiang Province, ChinaFormerly known as Ningbo Ningshing Special-Steel Group Co., Ltd., we are a holding subsidiary of Ningbo Ningshing Holdings Corporation.
After years of development, we have successfully realized the transformation of "industry supply chain ecosystem" from only trading to integrated operation, including distribution and retail, precision processing, intelligent manufacturing, vacuum heat treatment, technical services and international trade, etc.
As one of the largest special steel distribution enterprises in China with imported and homemade tool steel materials, Ningshing P
Introduction To The Role Of Residual Elements In Special Steel
Introduction To The Role Of Residual Elements In Special Steel
02/03/2022Article
8 fully reserved elements
Ni, Co, W and Mo can improve the hardenability of steel and are beneficial elements; Cu can cause copper embrittlement during high-temperture hot working of steel, but on the other hand, it can improve the ability of steel to resist atmospheric corrosion; Residual elements Sn, As and Sb are harmful elements, which not only strengthen copper brittleness in steel, but also lead to the brittleness of second tempering of alloy steel; Sn is one of the extremely harmful residual elements in steel, and Sn will greatly reduce the high temperature mechanical properties of steel and alloy.
7 partially reserved elements
C, Mn, S and P are conventional control elements; Cr can improve the oxidation resistance of steel, increase the corrosion resistance and hardenability of steel, but also increase the tempering brittleness; N is beneficial to control the grain size of austenite, but at the same time it can also cause strain aging of steel; H in steel is a harmful and unhelpful element, which can cause white spot, cracks in low-alloy high strength steel, etc.
