Stainless steel welded flange
Kun Yongjia County of valve parts plant (Www.kundamfj.com) products are mainly used valve Connection with the pipe, welded flange distortion, sealed, widely used for large fluctuations in pressure or temperature line or temperature, high pressure and low temperature piping, the advantage of cheaper prices, nominal pressure not more than 2.5MPa; also used to transport expensive pipeline flammable, explosive media, nominal pressure in PN16MPa around.
Stainless steel welded flange Adopt certain technical parameters and requirements in the production and manufacture of production and use, guaranteed to use and promote a certain way and in accordance with the principle of the use of certain methods and principles of the process of production and welding, and strictly ensure the use of good quality. First, the level of technical requirements and welded flange should comply with the relevant requirements JB4726-4728 of 1, 0.25MP-1.0MPa, PN is carbon steel, austenitic Stainless Steel Forgings Allows the use of grade Ⅰ forgings. 2, except as follows, nominal pressure PN is 1.6MPa-6.3MPa forgings shall comply Ⅱ Ⅱ grade or above grade level requirements forgings. 3, in line with one of the following circumstances, should comply with Ⅲ and forgings requirements: (1) Nominal PN≥10.0MPa flange forgings; (2) Nominal pressure PN) 4.0MPa chromium molybdenum steel forgings; (3) Nominal pressure PN) 1.6MPa and the operating temperature ≤-20 degrees Celsius ferritic steel forgings Second, the general use of forged or welded flange forging rolling process made when using steel or steel manufacturing, must meet the following requirements: 1, welding flange shall be subject to ultrasonic testing, no delamination defects; 2, should be cut into strips along the rolling direction of steel, by bending butt into the ring, the ring and the surface of the cylindrical steel plate form shall not be used directly. neck flange machined to belt; 3, the ring should butt weld with full penetration welds; 4, ring butt weld after weld heat treatment should be carried out, and for 100% ray or ultrasonic testing, and ray detection in line with the requirements of Class II JB4730 and JB4730 ultrasonic testing in line with the I-level requirements. Third, welded flange neck outer slope shall not exceed 7o. butt welding flange in the production and strictly control the technical parameters, to ensure production and use can fully play its role and value.
Common production standards: Ministry of Chemical Industry Standard HG / T20592-2009, HG / T20615-2009, the national standard GB / T9115.1-2000, GB / T9115.2-2000, GB / T9115.3-2000, GB / T9115.4 -2000 machinery of the standard JB / T86.2-94, marine standards CB / T47-1999