What are the differences between black and painted 09CuPCrNi-B steel tube

On March 26, 2020, the Mexican Ministry of Economic Affairs issued an announcement in the official gazette that the fourth anti-dumping sunset review investigation was initiated on 09CUPCRNI-B steel tube, hot rolled steel plates originating in Russia and Ukraine and boron-containing hot rolled steel plates originating in Russia. The TIGIE tax numbers of the steel products involved are 7208.10.99, 7208.26.01, 7208.27.01, 7208.38.01, 7208.39.01, 7225.30.04, 7225.30.05, 7225.40.03 and 7225.40.04.Specification range of available steel 09CUPCRNI-B steel tube: thickness ≤ 650mm, width ≤ 4500mm, length ≤ 18000mm. Larger specifications of steel plates are also available as required. Our steel plates 09CUPCRNI-B steel tube can be supplied according to Chinese standard, American Standard AISI / ASME / ASTM, Japanese JIS, German standard DIN, French NF, British BS, European EN, international ISO and other standards. Heat treatment process: controlled rolling, normalizing, tempering, normalizing plus tempering, quenching and tempering, etc.EN 10025-2 is standard for hot rolled products of structural steels. EN 10025-2 steel grades are 09CUPCRNI-B steel tube, S235JR, S235J0, S235J2 (S235 series); S275JR, S275J0, S275J2 (S275 series); S355JR, S355J0, S355J2, S355K2 (S355 series); and S450J0. The numbers 235, 275, 355, 450 indicates the min. yield strength for thickness ≤16mm. For example, when the thickness ≤16mm, the min. yield strength for S235 series steel is 235Mpa, S275 series steel is 275Mpa, S355 series steel is 355Mpa, and S450J0 steel is 450Mpa.After sales service support personnel pay attention to commitment in their work. In the process of people to people communication, mutual trust is an important factor for the long-term and stable communication. After sales service personnel must do what they say in the process of communication with customers.