Square tube carbon steel pipe black hollow section carbon steel Q235 square metal tube Grade: A53/ A106/ ASTM252/ ST37 Product Name Carbon Steel Pipe Material A53 Gr.B,A36,ST52,ST35,ST42,ST45,X42,X46,X52,X60,X65X70 Standard API 5L,ASTM A106 Gr.B,ASTM A53 Gr.B,ASTM A179/A192,ASTM A513,ASTM A671,ASTM A672,BS EN 10217,BS EN10296,BS EN 39,BS6323,DIN EN10217 Certificates API 5L,ISO9001,SGS,BV,CCIC Outer Diameter 15mm-1200mm Wall Thickness SCH10,SCH20,SCH30,STD,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XS,XXS Length 1m,4m,6m,8m,12m according to buyer's request Surface Treatment black paint,varnish,oil,galvanized,anti-corrosion coated Marking Standard marking,or according to your request.Marking Method:Spray white paint End Treatment Plain End/Bevelled End/Grooved End/Threaded End With Plastic Caps Technique Hot Rolled or Cold Rolled ERW Application Liquid delivery,structure pipe,construction,petroleum cracking,oil pipe,gas pipe Permanent Steel Manufacturing Co.,Ltd has been committed to being a major supplier of quality kinds of carbon steel pipe, stainless steel tube, hollow section, numerous types of piping equipment including Bend, Cap, Coupling, Elbow, Reducer, Stub End, Tee, Olet, Joint, Gasket, etc.As a factory,which specializing in the production, processing and sales of various steel pipes and pipe fittings size enterprises, headquartered in Hunan, the production base is located in Shandong and Tianjin. So far, the facility occupies more than 228,000 square feet under roof and includes two working mills and quality assurance chemical- and strength-testing laboratories on site and located on a 2,000-acre site with more than 60 acres under roof, is home to one of the world's largest cupolas; and the Contiarc, the first-of-its-kind continuous arc furnace.Our company has imported the advanced productive equipment and the inspection equipment, we will do the UT testing, RT testing on line, and the Hydrostatic testing during the production. 1.Payment terms:20%+80% TT,100% LC after sight 30-180 days,O/A (Open terms),D/P etc. 2.Quality assurance :We have agents, distributors and authorized partners in more than 80 countries and 140 cities around the world. Any problems about quality, logistics, after-sales within two years, we will help customers deal with and negotiate 24 hours unconditionally and be responsible for all after-sales problems. 3. Certificate of origin:Either from our Singapore base or China to avoid your anti dumping ,if any 4. Other Certificates:API,ISO,CE,EN10204 3.1/EN 10204 3.2,LOADING REPORT/INSPECTION for Free. 5.Biggest advantages:We have invested independent raw material mill