Tianjin the Jianhua electric Iron & Steel Co., Ltd., located in the Beichen District, Tianjin, mainly the production and sales of seamless pipe, alloy tube, high pressure boiler tube, stainless steel tube-based steel distribution center, annual inventory in tons or more, the main material : 20 # 35 # 45 # 16Mn 27SiMn 15CrMo of 12Cr1MoV 35CrMo. of Cr5Mo the P22 P23, 10CrMo910 of T91 T11 implementation of the international GB/T8162- 2008 (structural pipe), GB/T8163-2008 (fluid tube), GB/T3087-2008 (low and medium pressure boiler tubes), the GB/T5310-1995 GB5310-2008 (high-pressure boiler tubes), GB/T6479-86 (fertilizer dedicated pipe), GB/T9948-88 (petroleum cracking tube), stainless steel tube / plate / bar the implementation of standards 201 ( 1Cr17Mn6Ni5N), 202 (1Cr18Mn8Ni5N), 301 (1Cr17Ni7), 304 (0Cr18Ni9), 304L (00Cr19Ni10), 304N (, 0Cr19Ni9N), 309S (0Cr23Ni13), 310S (0Cr25Ni20), 316 (00Cr17Nl14Mo2), 316L (00Cr17Nl14Mo2), 317 (0Cr19Ni13Mo3),, 317L (ooCr19Ni13Mo3), 321 (1Cr18Ni9Ti), S41000 (0Cr13), 410 (1Cr13), 420 (2Cr13), 405 (0Cr13A100Cr12A1), 430 (1Cr17), 430 (00Cr18Mo2) cheap. My company "quality first, reputation first" principle, will the new and old customers to provide quality products and services, Miao Zong Hui, general manager with the staff wholeheartedly welcome you to come and guidance 
 Three security services: quality assurance, to ensure that the time to ensure that the number of 
 Purpose: the strength of a solid, quality products, low prices, first-class service. 
 Solemn promise: to ensure the best product, best quality, lowest price, the most comprehensive service to thank the trust of old and new customers. 
 Management principles: customer first, excellent quality, complete varieties, reasonable price 

 Fertilizer tube 
 Chemical fertilizer plants with high-pressure seamless pipe (GB6479-2006 fertilizer tube 
 ) Is applicable to operating temperature -40 ~ 400 ℃, working pressure of 10 ~ 30Ma chemical equipment and pipeline quality carbon structural steel and alloy steel seamless pipe. 1, high-quality carbon structural steel (GB/T699-1999) steel containing carbon (C) element contains a certain amount of silicon (Si) and deoxy (generally not more than 0.40%), manganese (Mn) (generally no more than 0.80 percent higher to 1.20%) of alloying elements, without other alloying elements (except for the residual element). Such steel must also ensure that the chemical composition and mechanical properties. Sulfur (S), phosphorus (P) impurity elements on the general control of less than 0.035%. Control in less than 0.030% called the high quality steel, the grade should be added later to an "A", such as 20A; P control below 0.025%, S control below 0.020%, said the super high-quality steel, the grade should be followed plus "E" to show the difference. For other residues from raw materials into steel alloying elements, such as chromium (Cr), nickel (Ni), copper (Cu), etc. the content of the general control of Cr ≤ 0.25%, Ni ≤ 0.30%, Cu ≤ 0.25%. Some grades of manganese (Mn) content of 1.40 percent, known as manganese steel. Such steel is dependent on the amount of adjustment of carbon (C) to improve the mechanical properties of steel, therefore, according to the level of carbon content, these steels can be divided into: low carbon steel - carbon content is generally less than 0.25%, such as 10, 20, steel, etc.; carbon steel - carbon content is generally between 0.25 to 0.60%, 35,45 steel, etc.; high-carbon steel - carbon content is generally greater than 0.60%. Such steel generally used in the manufacture of steel pipe. In fact, the carbon content between them and no clear boundaries. Such steel production, use a wider, more generally rolling (forging) is made of round, square, flat, profiles, sheet and seamless steel pipe. Mainly used in the manufacture of the general structure and mechanical structure of zero, components and building structure and transmission fluid pipe. According to application requirements, and sometimes need to heat treatment (normalizing or quenching and tempering). 2, alloy structural steel (GB/T3077-1999) such steel is due to join one or more of alloying elements on the basis of high-quality carbon structural steel, used to improve the mechanical properties of steel, toughness and hardenability. The use of such steel products manufactured, usually subject to heat treatment (normalizing or quenching and tempering); made parts and components prior to use, and usually need treatment (carburizing, nitriding, etc.) after quenching and tempering or surface chemistry, surface quenching or high-frequency quenching. Thus, according to the chemical composition (mainly carbon content), the heat treatment process and different purposes, such steel roughly can be divided into three kinds of carburizing, quenching and tempering and nitriding steel. Such steel multi-rolling (forging) made of round, square, flat profile and seamless steel pipe, used for the production of mechanical products more important and larger size zero, components and high-pressure pipeline, container, etc., this high-quality carbon structural steel more excellent mechanical properties. Such steel seamless steel pipe for hydraulic pillar, high-pressure cylinders, high pressure boiler, chemical fertilizer plants, petroleum cracking half sleeve, automotive, diesel, hydraulic fittings and other pipe. Carbon steel pipe weight formula: [(OD - Wall Thickness) * Wall thickness] * 0.02466 = kg / m (per meter weight) alloy steel pipe weight calculation formula: (OD - Wall Thickness) X wall thickness X0.02486 = KG / m 
 Petroleum cracking pipe / petroleum cracking seamless steel pipe Standard: GB9948-2006-China National Standard Oil cracking tube 
 Petroleum cracking tube manufacturing process: hot rolled, cold drawn, hot expansion purposes: used in petroleum refinery furnace tubes, heat exchanger tube and pipe seamless steel pipe. Production of steel pipe grades: 10,20,15 of CrMo 1Cr2Mo, 1Cr5Mo and Delivery status: 10, 20 the 15CrMo 1Cr2Mo 1Cr5Mo weight formula: Carbon tube: (OD - Wall Thickness) X wall thickness X0.02466 = kg / M- alloy tube: (OD - Wall Thickness) X-wall thickness X0.02486 = kg / M-dimensional tolerances: Tube types of outside diameter (D) wall thickness (S) 
 Cold drawn tubes and steel pipes OD (mm) tolerances (mm) wall thickness (mm) tolerances (mm) 
 > 30 to 50 ± 0.3 ≤ 30 ± 10% 
 > 50 to 219 ± 0.8% 
 Hot-rolled tubes> 219 ± 1.0%> 20 ± 10% 
 Mechanical properties: The standard grades of tensile strength (MPa) Yield strength (MPa) Elongation (%) Impact Energy (J) Brinell hardness (HB) delivery status 
 GB9948 10 330 490 ≥ 205 ≥ 24 / / normalizing 
 20 410 550 ≥ 245 ≥ 21 ≥ 39 / normalizing 
 The 15CrMo 440 ~ 640 ≥ 235 ≥ 21 ≥ 47 ≤ 170 normalized and tempered 
 1Cr2Mo ≥ 390 ≥ 175 ≥ 22 ≥ 92 ≤ 179 normalizing plus tempering 
 1Cr5Mo ≥ 390 ≥ 195 ≥ 22 ≥ 92 ≤ 187 annealing 
 The main material composition: 10 # (st35), 20 # (st45), 35 # (st55), 45 # (st45), 16Mn (st52) and other. DIN2391-81 standard outside diameter plus or minus tolerance is 0.08-0.10, the inner diameter of plus or minus tolerance of 0.10-0.15 prospective chemical composition, wall thickness plus or minus tolerance of 0.10-0.15: Standard Chemical Composition (%) 
 C Si Mn PS Cr of Mo of Ni 
 GB9948 10 0.07 ~ 0.14 0.17 ~ 0.37 0.35 ~ 0.65 ≤ 0.035 ≤ 0.035 ≤ 0.15 / ≤ 0.25 
 20 0.17 ~ 0.24 0.17 ~ 0.37 0.35 ~ 0.65 ≤ 0.035 ≤ 0.035 ≤ 0.25 / ≤ 0.25 
 15CrMo 0.12 ~ 0.18 0.17 ~ 0.37 0.40 ~ 0.70 ≤ 0.035 ≤ 0.035 0.80 1.10 0.40 0.55 ≤ 0.30 
 1Cr2Mo ≤ 0.15 0.50 ~ 1.00 0.30 ~ 0.60 ≤ 0.035 ≤ 0.030 2.15 ~ 2.85 0.45 ~ 0.65 / 
 1Cr5Mo ≤ 0.15 ≤ 0.50 ≤ 0.60 ≤ 0.035 ≤ 0.030 4.00 ~ 6.00 0.45 ~ 0.60 ≤ 0.60 

 In GB5310 -2 008 - Chinese national standard high-pressure boiler tubes 
 (High-pressure boiler seamless steel pipe) ASME SA106 ------- American Boiler and Pressure Vessel Code, ASME SA210 - American Boiler and Pressure Vessel Code, ASME SA213 - American Boiler and Pressure Vessel Code, DIN17175 - Federal Republic of Germany industry standard 
 Edit this paragraph, high-pressure boiler tube use 
 For low-pressure boiler (working pressure is generally not more than 5.88Mpa operating temperature below 450 ℃) of heating surface tubes; for high-pressure boiler (working pressure is generally more than 9.8Mpa, the working temperature of 450 ℃ ~ 650 ℃ heating surface tubes), economizer, superheater, reheater, the petrochemical industry pipe and so on. 
 Edit specifications and appearance quality of the high-pressure boiler tube 
 Specifications and appearance quality: GB5310-95 high-pressure boiler tube outer diameter 22 ~ 530mm, wall thickness 20 ~ 70mm ranges. Cold drawn (cold) pipe outer diameter 10 ~ 108mm, wall thickness 2.0 ~ 13.0mm range. 
 Edit this paragraph, major brands of high-pressure boiler tubes 
 Current total production and total consumption of high-pressure boiler tube manufacturers produce high-pressure boiler tubes, especially the production of 20G of the plant, the total production capacity of about 200 000 t. But manufacturers are not many real production strength, its production capacity of about 150 000 t. Actual output is less than 100 000 t in 1998. Currently on the market share of 41%, the boiler industry and weak demand. Φ10 ~ 1066mm specifications of steel pipe can supply. For a long time the main steel 20G, of 12Cr1MoV, G102. The main steels in the future will be the 20G 12Cr1MoV, T91 (P91), TP347H. Domestic T91 (P91), TP347H is still in the prototype stage. The needs of high-pressure boiler tubes and the development of thermal power are inseparable. Domestic installed capacity of 200 million kW in 1995. According to government plans in 2000 to reach 290 million kW, ie, an annual increase of 16 million kW. Which fire (75% calculation), an annual increase of 12 million kW boiler manufacturing per million kW consumption of 100t high-pressure boiler tubes, the annual consumption of 120,000 tons. Due to the introduction of imported boiler overall, the actual consumption of small this number. Plus power station construction (1.7t / 000 kW), the maintenance of thermal power units of ownership (6.5t / 000 kW), as well as performance requirements similar to the needs of the steel pipe and high pressure boiler tube, in recent years, annual consumption is estimated to be about 300 000 t. With the increase of population, the future maintenance tube amount will be the first. The development of high-pressure boiler to extend the performance parameters and length of service on the steel are rising ever higher, and new materials research and pipe lagging behind need. 10,20,20 G, 20MnG, 25MnG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8 / Ⅲ, 15Mo3, 13CrMo44, 10CrMo910