91中文精品,污污的视频免费在线观看,91就要激情,精品黄色网,欧美精品看片,久久久久久a亚洲欧洲aⅴ,天天干天天色综合网

Main Products
Products Grade: 40CrMoV,40CrMoV4-6、SNB16、B16、16MnCr5
Specifications: φ5.5~28mm
Applied Standard:  agreement
Characteristics: different kinds of fasteners of class 10.9
Applications: high-end parts
Use of Products: 40CrMoV,40CrMoV4-6,B16 is a commen alloy steel. It has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has characteristics of good cold heading properties ,stable heat-treatment properties. It has good comprehensive mechanical properties and specified elevated temperature properties.