07Cr18Ni11Nb steel has good resistance to intergranular corrosion, and has good corrosion resistance in alkali, seawater, and various acid solutions. Due to its good heat resistance and oxidation resistance, it can withstand small loads at temperatures below 850 degrees Celsius.
07Cr18Ni11Nb corresponds to brand: 1. National GB-T standard: digital brand: S34779, new brand: 07Cr18Ni11Nb, old brand: 1Cr19Ni11Nb, 2. American standard: ASTMA standard: S34709, SAE standard: 1. UNS standard: 347H, 3. Japanese standard: sus347HFB, 4. German DIN standard: 1.4912, 5. European EN standard: X7CrNiNb18-10.
General properties of 07Cr18Ni11Nb (S34779)
Alloy 347 is a stable austenitic chromium steel that contains mud and can eliminate carbide precipitation, thereby eliminating intergranular corrosion. Alloy 347 is stabilized by adding chromium and copper, and provides higher creep and stress rupture properties than alloys 304 and 304L. It can also be used for exposure involving sensitization and intergranular corrosion. The addition of col results in excellent corrosion resistance of alloy 347, even better than alloy 321. S34779 is a higher carbon component form of alloy 347 and exhibits improved high-temperature and creep properties.
07Cr18Ni11Nb (S34779) Application:
Alloy 347 is often used in manufacturing equipment and must be put into use under harsh corrosion conditions, and is also common in the petroleum refining industry. The applications that always use Alloy 347 include:
High-temperature chemical process
Heat exchanger tubes High temperature steam service High pressure steam tubes Radiant superheater Boiler tubes
Heavy duty exhaust system - corrosion resistance of pipeline S34779 in a refining plant:
Compared with 304 alloy, it has similar resistance to general overall corrosion, used in applications where alloys such as 304 alloy are susceptible to intergranular corrosion
Typically used for heavy-duty welding equipment that cannot be annealed and equipment operating between 800 to 150 ° F (427 to 816 ° C), alloy 347 is superior to alloy 321 for water-based and other low-temperature environments
Mainly used in high-temperature environments that require resistance to sensitization, in order to prevent lower levels of intergranular corrosion and susceptibility to stress corrosion cracking, S34779 exhibits similar oxidation resistance to all other 18-8 austenitic stainless steels and weldability
Austenitic stainless steel is considered the easiest to weld among all high alloy steels and can be welded through all fusion and resistance welding processes
Heat treatment of 07Cr18Ni11Nb (S34779)
Annealing temperature range from 1800 to 2000 ° F
Stress relief annealing can be carried out within the carbide precipitation range of 800 to 1500 ° F without any subsequent internal corrosion hazards and cannot be hardened through heat treatment
Company Profile
Wuxi Dingyu Xinda Special Steel Co., Ltd. has world-class metallurgical equipment, mature and stable technology, and safe and reliable process flow. The smelting of special functional superalloys adopts the VIM+VAR dual vacuum dual process and the VIM+PESR+VAR triple process for smelting production; Vacuum induction melting (VIM), vacuum consumable (VAR), atmosphere protected electroslag remelting (PESR) and conventional process IF+AOD+LF+VOD metallurgical equipment. Processing equipment such as heat treatment furnaces, peeling machines, rolling straightening machines, cold drawing machines, and coreless grinders; German Spike direct reading spectrometer, hardness machine, tensile machine, impact testing machine, automatic and manual ultrasonic non-destructive testing machine, eddy current non-destructive testing machine, corrosion testing machine, salt spray testing machine, German Leica metallographic microscope and other complete testing equipment. Since 2005, Dingyu Xinda has successively passed the certifications of Lloyd's ISO quality system and PED, IATF16949, ISO13485, KR Classification Society of Korea, and AD2000 in Germany. A high-tech enterprise specializing in the research and development of high-quality special alloy functional new materials, has been committed to providing safe and reliable products for global nuclear power and high-end equipment manufacturing. The company has been focusing on special stainless steel, nickel based alloys, precision alloys, high-temperature alloys, corrosion-resistant alloys, Hastelloy alloy special steel pipes, plates, bars, profiles and forgings, pipe fittings, and flanges for 31 years. The products can also be processed according to customer drawings, and are widely used in fields such as pump valve nuclear power, aviation and military industry, automobiles and ships, medical equipment, marine engineering and petrochemical, light rail high-speed rail, compressors, turbines, etc.
Supply materials: 310S, 309S, 309Si2, 310SSi2, 254SMo, 253Ma, 904L, 304Lmod, 724L, 725LN, 316MoD, 310MoD, 310MoLN, S31050, TP316Ti, 630, 631, 17-4PH, UNS S32101, UNS S32304, UNS S31500, UNS S31803, UNS S32205, UNS S32750, UNS S32707, UNS31260, UNS 32760, UNS 39274, 304/L, 316/L, 32270 1. 347, 304H/321H/347H/347HFG/316H/316Ti/304LN/316LN/317/L/310S/310HCBN S30815/314/904L, AL-6XN No8367, N04400, N06600, N08800, GH3030, H3039, N08825, N06625, N10276, 2507, Incoloy 800, 800H, Incoloy 825, S31254, F55, S32160, 2520Si2 (S314), 0Cr25Ni22Mo2N, 901, Income926/1.4529, Incoloy 800HT, Incoloy 8020, Incoloy 825, Inconel 601, Inconel 600, Inconel 625, GH3030, GH3039, GH2080, GH140, G3, G30 series, HaC-22, HaC-276, HaC-4, HaB-2, HaB-3, etc.
All products of our company comply with national standards (GB), American standards (ASME, ASTM), Japanese standards (JIS), EN (European standard), GOST (Russian standard), our company holds the ISO9001-2008 quality system certificate issued by TUV Rheinland in Germany and the PED/97/23/EC certificate for pressure equipment in the European Union, holds the API 6A and API 17D certificates issued by the American Petroleum Association API, and is also certified by the Eight Nation Classification Society.
F A Q
1. How can I know whether you are a reliable company?
We have been engaged in the steel industry for nearly 7 years and have a high reputation in China, We welcome you to inspect our company at any time.
2. Can you guarantee your products?
Yes, we guarantee your 100% satisfaction on all our products. Please feel free to feedback us immediately.
3. Do you provide samples?
Yes, we can provide most of the product samples. We will charge a little sample fee. But we will return the charge if you place an order. if you asked to use DHL, Blue Dart Express, FedEx, etc. to send samples, you can inform us in advance to prepare.
4. Can I visit your company?
Of course, If you want to order our products and visit our company, please contact us to make an appointment.
5. Can you make boxes according to my request ?
Yes,customization service is available,OEM business is appreciated.
When you place the orders,we arrange the production asap,When finish the orders, we will inform you and also we arrange the shipping in the same time.
6. How much is the freight?
It depends on the number and transport methods. When asked about the freight, we want you to let us know your detailed information , such as the product name and quantity and your favorite mode of transport, as well as your designated port or airport. We thank you for providing us the information to estimate the cost.
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