小口径直缝焊接钢管
Small-sized straight welded pipe
小口径速射火炮
Small caliber rapid firing artillery
小口径运动步枪
small-bore sporting rifle
小口径钻进
small diameter hole drilling
小口径钻孔桩
pile with small caliber bore hole
大口径钢管
pipe
Steel Pipe with Large Caliber
large diameter steel pipeline
大口径厚壁钢管
largy-diameter thick-walled tube
大口径厚壁无缝钢管
Heavy Caliber Thick-wall Seamless steel pipe