... CH8Ni9Ti 35CroGB/T3639-2000DIN2391For the automotive, motorcycle, engineering machinery, jack, electrical tools and sporting equipment and other areas10 ... API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60-630×1.53-40 Rectangular TubeQ195,Q235 ... works, mining, textile, electric power, boilers, drinking water, machinery, military industryDN80-1500-square pipeQ195,Q235,Q345,20#GB/T6278 ...