Features of SA299GrA, composition and properties of SA299GrA

Thread Content

I. What are the differences between SA299GrA produced in Wugang and imported SA299GrA steel plates? The chemical composition of domestically produced SA299GrA fully meets the standard requirements of ASME SA299GrA; the levels of harmful impurity elements such as P and S are low. Throughout the thickness of the steel plate, the chemical composition remains uniform, with no significant variation in composition. Compared to imported steel plates, domestically produced steel plates have lower levels of carbon, manganese, and chromium. Steelmaking process for SA299GrA and SA299GrB: The steel shall be a killed steel and must meet the requirements for fine grain size specified in standard A20/A20M. SA299GrA is a carbon-manganese-silicon steel plate used for pressure vessels. It is a C-Mn-SI steel designated for boiler and pressure vessel applications under the ASME standards, and is typically used in various welded components where the operating temperature does not exceed 400°C, such as boiler drums and pressure vessels. This steel is required to have high strength at medium temperatures. There are two grades of steel under the SA299 standard: SA299GrA and SA299GrB. For orders of SA299GrA and SA299GrB from Wuyang Steel Futures, contact 152-0375-0895** (in stock & cut to size). There are two grades under the SA299GrA standard: SA299GrA and SA299GrB. The thickness range for SA299GrA and SA299GrB steel plates is 8–200 mm. The delivery condition for these steel plates is either normalized or hot-rolled; generally, plates thicker than 50 mm should be delivered in a normalized state. The chemical composition of SA299GrA/SA299GrB is as follows: For SA299GrA, for thicknesses up to 25 mm: 0.26%, 0.90–1.40%, 0.15–0.40%, 0.035%, 0.035%; for thicknesses greater than 25 mm: 0.28%, 0.90–1.50%, 0.13–0.45%, 0.035%, 0.035%. For SA299GrB, for thicknesses up to 25 mm: 0.28%, 0.90–1.40%, 0.15–0.40%, 0.035%, 0.035%; for thicknesses greater than 25 mm: 0.30%, 0.90–1.50%, 0.13–0.45%, 0.035%, 0.035%. The mechanical properties of SA299GrA/SA299GrB are as follows: For tensile properties, the tensile strength ranges from 75–95 MPa (515–655 psi) for grade A and B, respectively, while the yield strength ranges from 42 MPa (290 psi) for thicknesses up to 25 mm and 47 MPa (325 psi) for thicker plates; for grades SA299GrA and SA299GrB, the yield strength ranges from 40 MPa (275 psi) for thicknesses up to 25 mm and 45 MPa (310 psi) for thicker plates. The steelmaking process for SA299GrA and SA299GrB requires that the steel be a killed steel that meets the requirements for fine grain structure as specified in standard A20/A20M. Characteristics of SA299GrA: It is a C-Mn-Si steel designated for boiler and pressure vessel applications under the ASME standards. It is used in various welded components operating at temperatures up to 400°C, such as boiler drums and pressure vessels. This steel is required to have high strength at medium temperatures, good plasticity, as well as excellent properties regarding heat treatment and welding processes. SA299 extra-thick plates are mainly used for the heads and shells of the steam drums in 300MW\600MW subcritical boilers. The application submitted by Wuhan Iron and Steel Group for expanding the production thickness range of this steel plate to 200mm was approved by the National Technical Committee for Standardization of Boilers and Pressure Vessels. This marks Wugang as the only manufacturer in China capable of producing SA299GrA steel plates with a thickness of 200 mm. VIII. Applications of SA299GrA 1. SA299GrA steel plates are one of the materials widely used in the boiler drums (vessels) of coal-fired power generation units. At present, extra-thick steel plates for boiler drums have not yet been manufactured domestically in China; SA299GrA extra-thick steel plates are highly dependent on imports, which significantly affects the cost control and delivery times of domestic boiler manufacturers. 2. At the end of last year, Wugang independently developed SA299GrA extra-thick steel plates for boiler drums using its own produced steel ingots, with a thickness of 178 mm. As assessed by professional authoritative institutions, the normal and high-temperature mechanical properties, macroscopic and microscopic structure, and welding performance of this steel plate meet the requirements for boiler drum products; it can therefore be used in the manufacturing of boiler drum equipment. This breaks the situation in which extra-thick steel plates for boilers rely heavily on imports, laying a solid foundation for domestic production. To date, Wugang is the only manufacturer in China capable of mass-producing large-thickness boiler drum plate products. Following hydrogen-resistant chromium-molybdenum steel, hydrogen sulfide-resistant corrosion-resistant steel, and rack steel for offshore platforms, thick-gauge boiler drum plates are regarded as Wugang’s fourth major series of \"high-quality steels\".