Hebei seamless steel pipe, API 5L seamless steel pipe, dry 100000000

Hebei seamless steel pipe, API 5L seamless steel pipe industry Dry million provided by the dry 100000000. Dry million mounds Pipe Co., Ltd. (www.qygy.cc) Hebei Cangzhou Premium Business League certification companies, with brands such as dry-million, has a good reputation, honesty, service-oriented "business alliance customer service" on page click icon, we will be happy to serve you! No. 45 is a high-quality carbon steel structural steel, high hardness cutting machining, mold used to do template, shoot sub thermal expansion seamless steel tubes, guide posts, etc., subject to heat treatment. No tempering 1.45 before hardening of steel, hardness greater than HRC55 (up to HRC62) is qualified. The actual application of the maximum hardness of HRC55 (induction hardening HRC58). 2.45 not to use heat treatment of steel carburizing. After quenching parts with good mechanical properties, is widely used in a variety of important structural parts, especially those under the alternating load rod work, bolts, gears and shafts, etc. However, the surface hardness is low, do not wear. Available quenching + surface hardening to improve part surface hardness. Carburizing treatment is generally used for surface abrasion, impact-resistant heavy duty core API seamless steel parts, its wear resistance than quenching + surface hardening high. Its surface carbon content 0.8 - 1.2% seamless core generally 0.1 - 0.25% (0.35% of the use of special circumstances). After heat treatment, the surface can get very high hardness (HRC58 - 62) API 5L seamless steel pipe, low core hardness, impact resistance. If you use 45 steel carburizing, quenching the core will be hard and brittle martensite, losing the advantages of carburizing process. Carburizing process using materials, carbon content is not high now, to 0.30% of the core may have reached a very high intensity, applications are rare. 0.35% have never seen an instance, only in the textbooks are introduced. + Can be used quenched and tempered high-frequency surface hardening process, wear slightly worse than the carburizing. 1.1 20 steel seamless steel tubes for general, there are three standards. Standard GB/T8162-2008 seamless steel pipe for structural; perform standard GB/T8163-2008 for conveying fluids generally seamless; perform standard GB/T3087-2008 seamless steel pipe for high pressure, which is applicable to manufacturing various structural low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam locomotive boiler tubes, opium pipe, small pipe and arch bricks of high quality carbon structural steel hot-rolled and cold call (rolled) seamless steel pipe. Standard GB/T5310-2008] [20G is to manufacture high quality carbon structural steel and more pressure steam boiler pipelines with such widely used to manufacture medium temperature ≤ 430 ℃ economizer, superheater, water wall, water supply, the main steam pipe.