Changzhou Tenjan Steel Tube Co., Ltd. was founded in 2004. The annual production capacity can reach 60,000 tons under years of development. We are a leading technical manufacturer in the seamless steel tube and rebar coupler industry. The chairman of Tenjan, Mr. Wensheng Gu has 25-year experience in steel tube industry and is the major constitutor of national standard Couplers for Rebar Mechanical Splicing JG/T 163-2013.Tenjan is specialized in custom production of high quality seamless steel tubes under international standards ASTM A519, ASTM A106, ASTM A500, ASME SA500, DIN2391, DIN1629, EN10305-1, DIN17121, EN10297-1, JIS3441, JIS3444 and JIS3445. We provide small batch customization service, especially for small and medium-size enterprises. Raw material, internal and external dimensional tolerances and consistency, internal and external surface roughness, straightness, mechanical property, eccentricity, special shape, alloy steel, small-diameter thick-walled seamless steel tubes all can be customized. The production range for outer diameter is from 10 to 120mm and for wall thickness is from 1 to 20mm. As a seamless steel tube manufacturer, we use own quality tubes to produce rebar couplers to ensure quality of raw material. We can customize rebar couplers according to the performance requirements especially in respect of mechanical properties, such as tensile strength and breaking force. This makes us become a technical leader in the rebar coupler industry. Our steel tubes have been widely used in auto parts, machinery processing, drilling and other fields. And rebar couplers are utilized in the international hydropower projects and bay bridges. We have won the national automobile industry quality system certification IATF16949 and ISO9001.