Circular hollow steel: D32.D38.D45.D51.D60.D70.D81.D92; hexagonal hollow steel: H22.H25.H28.H32.H35; Material: FF710.23CrNi3MoA.35SiMnMoV.55SiMnMo like. Geological pipe: Φ42.Φ50.Φ63.5.Φ73.Φ89 and supporting joint pipe material: R780.DZ50.DZ60.42CrMo etc. Shandong Peng Rui Drilling Technology Co., Ltd. was founded in 1992, is a design, development, production, sales and service as one of the professional manufacturer, the company's main products are: hexagonal hollow steel circular hollow steel, hydraulic drill rod materials, hollow bolt grouting materials, geological tube, tunnel drill, blast furnace brazing material opening and finished brazing, horizontal spiral drill pipe, drill pipe Teng Ma, Kilometers special drill rig, drill drill drill steel bolt, screw anchor drill pipe, drill pipe ribs, efficient spiral drill pipe, exploring water exploration gas drill pipe, drill pipe, geological diamond drill, various drill bits, mining tools and other equipment. class production equipment hollow drill steel drill rod, strong technical force, our company is located in Shandong to land, There are a hundred years of history of coal production in Zibo, close to 205 National Road, location and convenient transportation. Mature manufacturing processes, advanced production and testing tools, is a reliable guarantee of product quality, after years of development, the company has products to diversify, series production, and established a strict procurement system, process control, storage and transportation, etc. scientific system to ensure to provide you with after sales service, new and old customers to return all the support and love. Business philosophy: the first service, the customer first, high quality and excellence. Rod material, select cross-sectional shape, geometry, gauge length is based on the hardness of the size of the rock drill impact energy, rock drill bit diameter, rock hole depth, the use of drills to solder tail caudal peduncle connectivity requirements, as well as rock drills feeding methods to select the drill rod. Normally meet requirements under the premise circular hollow drill steel, should try to choose a moderate section, lighter, shorter length, rigidity and long life of drill rod. For hand-held drill, generally used in connection taper, a hexagonal cross-section of H22, H25 drill rod, shank size of 108mm x H22, made of 55SiMnMo, 95CrMo etc; for Drifting rock, generally used in H25, H28, H32, H35 threaded connections with hexagonal cross-section diameter, reducers and quick-change drill rod (drill rod, drill pipe, hydraulic drilling rig drill pipe, drill rod, heavy drill rod, hydraulic drill). For production drilling (underground, open-pit mining), generally used in D35, D38, D45, D51, D60, D65, D76, D87 circular cross-section, with the diameter of threaded connections, reducers and quick-change drill rod and drill pipe. Specifications Length selection principle is: be determined in accordance with the requirements of drilling depth, generally within the range of 0.3 --- 7.3mm. Circular hollow steel, hydraulic drill rod (certified), hollow steel supplied by Zibo Peng Rui Metal Products Limited. Zibo Peng Rui Metal Products Co., Ltd. (www.zbpengrui.com) Shandong Zibo, metal cutting class leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Zibo Peng Rui Metal Products Co. led the staff warmly welcome all inquiries negotiations to create Zibo Peng Rui Metal Products Co. a better future.