堕落的圣骑士在线观看完整版未删减|尖峰时刻1完整版电影在线观看|日韩中文字幕成人免费视频|日韩中文字幕组,性xxxhd,先锋影音欧美,91日本在线播放

Main Products
steel for machine structure Products>> Main Products>> steel for machine structure
Products Grade: 20Cr2MnMoA
Specifications: φ20~28mm
Applied Standard:  agreement
Characteristics: this product is used to produce continuous sucker rods.
Applications: Sucker rod
Use of Products: This grade has the feature of stable chemical composition, low harmful elements(O、N) and nonmetallic inclusions, minor decarburization, good surface quality,good plasticity and notched bar impact strength after heat treating.Now our product is used in Shengli Oil Field.