国色天香手机视频免费网|汤唯色戒床上未删减版|91视频大全|在线免费成人,不忠未删减完整版电影,久久性天堂,伊伊亚洲综合人网777

Main Products
Products Grade: ML45Mn2
Specifications: Φ14~38mm
Applied Standard:  agreement
Characteristics: or manufacturing rivet of boxcar.
Applications: Fastener steel
Use of Products: uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality,are commen steel grade .After spheroidize annealing, this product has characteristics of good cold heading properties ,stable heat-treatment properties, good hardenability.