激情六月丁香婷婷,独臂刀客22集高清完整版在线观看,丁香深爱五月,亚洲美女高潮久久久,重生之炉鼎未删减完整版在线观看免费,韩国三级在线最新未删减,免费看黄色电影

Main Products
Products Grade: SCr420B
Specifications: φ16~38mm
Applied Standard: 
Characteristics: This product is used to produce high strength bolt of class 12.9.
Applications: Common partsCommon fastenerHigh strength fastener
Use of Products: SCr420B is a steel grade which used to produce high strength bolt of class 12.9 .This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties. And the product has excellent hardenability.