Shandong Dongfang Hualong Group, established in 1994, is engaged in refinery and production of chemicals, leather shoes, machine manufacturing, with R&D center, a total assets of around 45 million US Dollars, 860 employees. Dongfang Hualong group consists of 6 sub companies which refine 600,000 tons of crude oil and fuel, produce 50,000 tons of 4A zeolite, 400 tons of oilfied and fine chemical agents, 1,000 tons of paper-producing agents, 500 sets beam pumping units, and 150,000 pairs of leather shoes. With of support of the R&D center and several famous research institutes in universities, our 4A Zeolite is with high quality, stable production capacity and competitive price.We are setting up a mill for production of casing and tubing coupling in China. This mill will put into operation 3 months later, by then we mainly produce casing and tubing couplings with grade J55, K55, L80, N80 and P110 and with connection of STC, BTC and LTC. The range of OD is 2-3/8, 2-7/8, 3-1/2, 4-1/2, 5, 5-1/2, 7, 9-5/8, 13-5/8 inches. Welcome casing and tubing mills cooperating with us.