• Standurd: api 5l, gb/t9711. 1, astm a252, sy/t3087-1999  
• material: q235, q345, 20#, a, b, x42—x70etc  
• size: 1/2-48     
• wall thicness: sch5-sch160   
• packing: according to client's requirment 
• application: petroleum, power, gas, construction
• finish: black, galvanised etc.