... 4) Can meet our clients' different requirement to make U-type tube Alloy No.:C70600,C44300,C71500,C68700Standard: GB, ASTM, EN ... , clean, bright on both outer and inner surfaces 3.Chemical composition strictly conform to relevant standards4.Can meet our clients' different ... requirement to make U-type tube5.Free from defects such as blowholes, cracks, pin hole ...